Fixed python bindings generation

In prep for wayland support

.gitignore

@@ -6,7 +6,6 @@ Makefile
 CMakeFiles
 CMakeCache.txt
 /examples/example
-libdocks.so
 tst_docks
 CMakeLists.txt.user*
 /build
@@ -34,7 +33,8 @@ cmake_install.cmake
 latex
 html
 custom_titlebar
-libkddockwidgets.so
+libkddockwidgets.so*
+libkddockwidgets_multisplitter.so*
 *.depends
 kddockwidgets_basic_quick
 /src/KDDockWidgetsConfig.cmake
@@ -51,3 +51,11 @@ mylayout.json
 *.pri
 /docks-w
 kddockwidgets_minimal_example
+/docs/api/Doxyfile
+/docs/api/qch/kddockwidgets-api.qch
+/doxygen.log
+/kddockwidgets.tag
+/CMakeDoxyfile.in
+/CMakeDoxygenDefaults.cmake
+/Testing
+/layout_tst*

.vscode/settings.json

@@ -4,7 +4,7 @@
         "qevent": "cpp"
     },
     "cmake.configureSettings": {
-        "OPTION_DEVELOPER_MODE" : "ON",
+        "KDDockWidgets_DEVELOPER_MODE" : "ON",
-        "OPTION_QTQUICK" : true
+        "KDDockWidgets_QTQUICK" : true
     }
 }

CMakeLists.txt

@@ -25,18 +25,26 @@
 #
 # -DKDDockWidgets_DOCS=[true|false]
 #  Build the API documentation.
-#  Default=true
+#  Default=false
 #
-# -DOPTION_DEVELOPER_MODE=[true|false]
+# -DKDDockWidgets_DEVELOPER_MODE=[true|false]
 #  Configure the build for a developer setup.
 #  Enables some features that are not geared towards end-users.
 #  Forces the test harness to be built.
 #  Default=false
 #
-# -DOPTION_BUILD_PYTHON_BINDINGS=[true|false]
+# -DKDDockWidgets_QTQUICK == IN DEVELOPMENT. DO NOT USE! ==
+#  Build for QtQuick instead of QtWidgets
+#  Default=false
+#
+# -DKDDockWidgets_PYTHON_BINDINGS=[true|false]
 #  Build/Generate python bindings.  Always false for Debug builds
 #  Default=false
 #
+# -DKDDockWidgets_PYTHON_BINDINGS_INSTALL_PREFIX=[path]
+#  alternative install path for python bindings
+#  Default=CMAKE_INSTALL_PREFIX
+#
 
 cmake_minimum_required(VERSION 3.7)
 if(POLICY CMP0020)
@@ -46,10 +54,12 @@ if(POLICY CMP0042)
   cmake_policy(SET CMP0042 NEW)
 endif()
 
-if("${CMAKE_INSTALL_PREFIX}" STREQUAL "")
+set(KDAB_INSTALL True)
-  set(USE_DEFAULT_INSTALL_LOCATION True)
+if((NOT DEFINED ${USE_DEFAULT_INSTALL_LOCATION}) OR (NOT ${USE_DEFAULT_INSTALL_LOCATION}))
-else()
+  if(NOT "${CMAKE_INSTALL_PREFIX}" STREQUAL "")
-  set(USE_DEFAULT_INSTALL_LOCATION False)
+    set(KDAB_INSTALL False)
+  endif()
+  set(USE_DEFAULT_INSTALL_LOCATION ${KDAB_INSTALL} CACHE INTERNAL "Install to default KDAB Location" FORCE)
 endif()
 
 if(${CMAKE_VERSION} VERSION_LESS "3.12.0")
@@ -62,28 +72,29 @@ else()
 endif()
 
 set(${PROJECT_NAME}_VERSION_MAJOR 1)
-set(${PROJECT_NAME}_VERSION_MINOR 0)
+set(${PROJECT_NAME}_VERSION_MINOR 1)
 set(${PROJECT_NAME}_VERSION_PATCH 95)
+
 set(${PROJECT_NAME}_VERSION ${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}.${${PROJECT_NAME}_VERSION_PATCH})
-set(${PROJECT_NAME}_SOVERSION "1.1")
+set(${PROJECT_NAME}_SOVERSION "1.2")
 
 include(FeatureSummary)
 
-option(OPTION_DEVELOPER_MODE "Developer Mode" OFF)
+option(${PROJECT_NAME}_DEVELOPER_MODE "Developer Mode" OFF)
-option(OPTION_BUILD_PYTHON_BINDINGS "Build python bindings" OFF)
+option(${PROJECT_NAME}_PYTHON_BINDINGS "Build python bindings" OFF)
-if(OPTION_BUILD_PYTHON_BINDINGS AND (CMAKE_BUILD_TYPE MATCHES "^[Dd]eb" OR ${PROJECT_NAME}_STATIC))
+if(${PROJECT_NAME}_PYTHON_BINDINGS AND (CMAKE_BUILD_TYPE MATCHES "^[Dd]eb" OR ${PROJECT_NAME}_STATIC))
   message(FATAL_ERROR "** Python Bindings are disabled in debug or static builds.")
 endif()
 option(${PROJECT_NAME}_TESTS "Build the tests" OFF)
 option(${PROJECT_NAME}_EXAMPLES "Build the examples" ON)
-option(${PROJECT_NAME}_DOCS "Build the API documentation" ON)
+option(${PROJECT_NAME}_DOCS "Build the API documentation" OFF)
 
 #Always build the test harness in developer-mode
-if(OPTION_DEVELOPER_MODE)
+if(${PROJECT_NAME}_DEVELOPER_MODE)
   set(${PROJECT_NAME}_TESTS ON)
 endif()
 
-# option(OPTION_QTQUICK "Build for QtQuick instead of QtWidgets" OFF)
+#option(${PROJECT_NAME}_QTQUICK "Build for QtQuick instead of QtWidgets" OFF)
 
 find_package(Qt5Widgets 5.9 REQUIRED)
 
@@ -99,15 +110,18 @@ include(InstallLocation)
 include(QtInstallPaths) #to set QT_INSTALL_FOO variables
 
 macro(set_compiler_flags targetName)
-  if(OPTION_DEVELOPER_MODE)
+  if(${PROJECT_NAME}_DEVELOPER_MODE)
     target_compile_definitions(${targetName} PRIVATE DOCKS_DEVELOPER_MODE QT_FORCE_ASSERTS)
     if(NOT MSVC)
       target_compile_options(${targetName} PRIVATE -Wall -Wextra -Werror -Wno-error=deprecated-declarations)
+      if (APPLE)
+        target_compile_options(${targetName} PRIVATE -Wweak-vtables)
+      endif()
     endif()
   endif()
 endmacro()
 
-if(OPTION_QTQUICK)
+if(${PROJECT_NAME}_QTQUICK)
   find_package(Qt5Quick)
   find_package(Qt5QuickControls2)
   add_definitions(-DKDDOCKWIDGETS_QTQUICK)
@@ -142,12 +156,12 @@ install(FILES LICENSE.txt README.md DESTINATION ${INSTALL_DOC_DIR})
 install(DIRECTORY LICENSES DESTINATION ${INSTALL_DOC_DIR})
 
 add_subdirectory(src)
-if(OPTION_BUILD_PYTHON_BINDINGS)
+if(${PROJECT_NAME}_PYTHON_BINDINGS)
   add_subdirectory(python)
 endif()
 
 if(${PROJECT_NAME}_EXAMPLES)
-  if (OPTION_QTQUICK)
+  if (${PROJECT_NAME}_QTQUICK)
     add_subdirectory(examples/qtquick)
     set_compiler_flags(kddockwidgets_example_quick)
   else()
@@ -158,13 +172,13 @@ if(${PROJECT_NAME}_EXAMPLES)
   endif()
 endif()
 
-if(OPTION_DEVELOPER_MODE)
+if(${PROJECT_NAME}_DEVELOPER_MODE)
   include(ECMEnableSanitizers)
   if(${PROJECT_NAME}_TESTS)
     enable_testing()
     add_subdirectory(tests)
 
-    if (NOT OPTION_QTQUICK)
+    if (NOT ${PROJECT_NAME}_QTQUICK)
         #Require Qt5.15.1 or higher to run the tests_launcher tests on Mac
         if(NOT APPLE OR Qt5Widgets_VERSION VERSION_GREATER 5.15.0)
         # tst_docks.exe is pretty big (140 tests), so split it in 6 runs so we can use threads.

Changelog

@@ -1,7 +1,29 @@
-* v0.1 (November 4th, 2019)
+* v1.2.0 (unreleased)
-  - Initial Release and blog
+  - QtQuick support
 
-* v1.0.0 (, 2020)
+* v1.1.0 (unreleased)
+  - New drop indicator style type: Segmented Indicators
+  - Windows: Drop Shadow for floating windows
+  - Added AutoHide / SideBar support
+  - Added FocusScope support
+  - Added DockWidget::isFocused() and DockWidgetBase::isFocusedChanged()
+  - Added Config::Flag_AlwaysTitleBarWhenFloating, which complements Flag_HideTitleBarWhenTabsVisible
+  - Added Config::Flag_DontUseUtilityWindowsForFloating
+  - Added Config::Flag_TitleBarHasMinimizeButton
+  - Added Config::Flag_TitleBarNoFloatButton
+  - Added Config::Flag_AutoHideSupport
+  - Bugfixes:
+    - Windows: Fixed windows not having proper minimum size.
+    - Windows: Fixed moving windows across screens with different DPI (#72)
+    - Don't center floating windows if the user set a custom position (#75)
+    - Fixed floating window's title not being correct (#74)
+    - Fixed focus scope not reacting when clicking on current tab (#71)
+    - Fixed floating window borders not being rendered correctly on HDPI due to rounding errors.
+
+* v1.0.1 (unreleased)
+  - cmake/Python - don't require pkg-config, only use if available (#68)
+
+* v1.0.0 (2 September 2020)
   - PySide2 bindings
   - Rewrote the layouting engine, resulting in a huge stability gain and makes it easy to add new features
   - Honour min/max sizes and some QSizePolicy heuristics
@@ -27,11 +49,5 @@
   - Namespaced Qt support
   - Dozens of crash fixes, bugs and much more...
 
-* v1.1.0 (, 2020)
+* v0.1 (4 November 2019)
-    - New drop indicator style type: Segmented Indicators
+  - Initial Release and blog
-    - Added FocusScope support
-    - Added DockWidget::isFocused() and DockWidgetBase::isFocusedChanged()
-    - Added Config::Flag_AlwaysTitleBarWhenFloating, which complements Flag_HideTitleBarWhenTabsVisible
-
-* Roadmap
-    - QtQuick support

README.md

@@ -1,5 +1,5 @@
 KDDockWidgets
-==============
+=============
 `KDDockWidgets` is a Qt dock widget library written by KDAB, suitable for replacing
 `QDockWidget` and implementing advanced functionalities missing in Qt.
 
@@ -20,7 +20,7 @@ creative with their requests, so it was clear we needed a better docking framewo
 
 You will find more information in these places:
 
- * [our official home page](https://www.kdab.com/kddockwidgets)
+ * [our official home page](https://www.kdab.com/development-resources/qt-tools/kddockwidgets)
  * [online detailed browsable API reference](https://docs.kdab.com/kddockwidgets)
  * [our example programs](examples/)
 
@@ -56,15 +56,15 @@ Features
 - Double click on separator to distribute equally
 - Show close button on tabs
 - Allow to make a dock widget non-closable and/or non-dockable
-- Optional maximize button on the title bar
+- Optional minimize and maximize button on the title bar
+- FloatingWindows can be utility windows or full native
 
 ![Screen capture](./screencap.gif?raw=true "The docking system in action")
 
 
 Roadmap
 ========
-  - QtQuick support for v1.1
+  - QtQuick support
-  - "Minimization bar" for v1.2
 
 Trying out the examples
 =======================
@@ -81,15 +81,15 @@ Build and install the KDDockWidgets framework:
 
 ```
 $ cmake -G Ninja -DCMAKE_INSTALL_PREFIX=/path/where/to/install ../path/to/kddockwidgets
-$ make
+$ cmake --build .
-$ make install
+$ cmake --build . --target install
 ```
 
 Now build and run the example:
 ```
 $ cd path/to/kddockwidgets/examples/dockwidgets/
-$ cmake -DCMAKE_PREFIX_PATH=/path/where/to/install
+$ cmake -G Ninja -DCMAKE_PREFIX_PATH=/path/where/to/install
-$ make
+$ cmake --build .
 $ ./kddockwidgets_example
 
 ```
@@ -114,13 +114,13 @@ For more info visit https://doc.qt.io/qtforpython/shiboken2/gettingstarted.html
 Once QtForPython is installed you are ready to generate the PySide bindings
 for KDDockwWidgets.
 
-Next pass `-DOPTION_BUILD_PYTHON_BINDINGS=ON` to CMake, followed by the
+Next pass `-DKDDockWidgets_PYTHON_BINDINGS=ON` to CMake, followed by the
 make command.
 
 The bindings will be installed to the passed `-DCMAKE_INSTALL_PREFIX`, which
 might require setting the `PYTHONPATH` env variable to point to that path when
 running applications.  Alternatively, configure the bindings install location
-by passing `-DPYTHON_BINDINGS_INSTALL_PREFIX=/usr/lib/python3.8/site-packages`
+by passing `-DKDDockWidgets_PYTHON_BINDINGS_INSTALL_PREFIX=/usr/lib/python3.8/site-packages`
 to CMake (adjust to the python path on your system).
 
 To run the KDDW python example

cmake/Python/FindPySide2.cmake

@@ -1,6 +1,4 @@
 #
-# This file is part of KDDockWidgets.
-#
 # SPDX-FileCopyrightText: 2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
 # Author: Renato Araujo Oliveira Filho <renato.araujo@kdab.com>
 #
@@ -15,9 +13,12 @@
 #  PYSIDE_TYPESYSTEMS   - Type system files that should be used by other bindings extending PySide2
 #
 # You can install PySide2 from Qt repository with
-# pip3 install --index-url=https://download.qt.io/snapshots/ci/pyside/<Qt-Version>/latest/ pyside2 --trusted-host download.qt.io
+# pip3 install --index-url=https://download.qt.io/official_releases/QtForPython --trusted-host download.qt.io pyside2
-find_package(PkgConfig REQUIRED) 
+
-pkg_check_modules(PYSIDE2_PRIV pyside2 QUIET)
+find_package(PkgConfig)
+if(PKG_CONFIG_FOUND)
+  pkg_check_modules(PYSIDE2_PRIV QUIET pyside2)
+endif()
 
 set(PYSIDE2_FOUND FALSE)
 

cmake/Python/FindShiboken2.cmake

@@ -1,6 +1,4 @@
 #
-# This file is part of KDDockWidgets.
-#
 # SPDX-FileCopyrightText: 2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
 # Author: Renato Araujo Oliveira Filho <renato.araujo@kdab.com>
 #
@@ -15,9 +13,12 @@
 #  SHIBOKEN_BUILD_TYPE         - Tells if Shiboken was compiled in Release or Debug mode.
 
 # You can install Shiboken from Qt repository with
-# pip3 install --index-url=https://download.qt.io/snapshots/ci/pyside/<Qt-Version>/latest/ shiboken2-generator --trusted-host download.qt.io
+# pip3 install --index-url=https://download.qt.io/official_releases/QtForPython --trusted-host download.qt.io shiboken2-generator
-find_package(PkgConfig REQUIRED)
+
-pkg_check_modules(SHIBOKEN2_PRIV shiboken2 QUIET)
+find_package(PkgConfig)
+if(PKG_CONFIG_FOUND)
+  pkg_check_modules(SHIBOKEN2_PRIV QUIET shiboken2)
+endif()
 
 set(SHIBOKEN_FOUND FALSE)
 
@@ -114,7 +115,6 @@ else()
         set(SHIBOKEN_SEARCH_PATHS ${SHIBOKEN_CUSTOM_PATH})
         list(APPEND SHIBOKEN_SEARCH_PATHS ${SHIBOKEN_BASEDIR})
         list(APPEND SHIBOKEN_SEARCH_PATHS ${SHIBOKEN_GENERATOR_BASEDIR})
-message(STATUS "BOO: ${SHIBOKEN_SEARCH_PATHS}")
         find_file(SHIBOKEN_LIBRARY
             ${SHIBOKEN_LIBRARY_BASENAMES}
             PATHS ${SHIBOKEN_SEARCH_PATHS}

cmake/Python/PySide2ModuleBuild.cmake

@@ -1,6 +1,4 @@
 #
-# This file is part of KDDockWidgets.
-#
 # SPDX-FileCopyrightText: 2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
 # Author: Renato Araujo Oliveira Filho <renato.araujo@kdab.com>
 #
@@ -9,11 +7,11 @@
 # Contact KDAB at <info@kdab.com> for commercial licensing options.
 #
 
-if (NOT PYTHON_BINDINGS_INSTALL_PREFIX)
+if (NOT ${PROJECT_NAME}_PYTHON_BINDINGS_INSTALL_PREFIX)
-    SET(PYTHON_BINDINGS_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE FILEPATH "Custom path to install python bindings.")
+    SET(${PROJECT_NAME}_PYTHON_BINDINGS_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE FILEPATH "Custom path to install python bindings.")
 endif()
 
-message(STATUS "PYTHON INSTALL PREFIX ${PYTHON_BINDINGS_INSTALL_PREFIX}")
+message(STATUS "PYTHON INSTALL PREFIX ${PROJECT_NAME}_PYTHON_BINDINGS_INSTALL_PREFIX}")
 
 if (WIN32)
     set(PATH_SEP "\;")
@@ -23,6 +21,19 @@ endif()
 if (NOT CMAKE_CXX_STANDARD)
     set(CMAKE_CXX_STANDARD 17)
 endif()
+
+# On macOS, check if Qt is a framework build. This affects how include paths should be handled.
+get_target_property(QtCore_is_framework Qt5::Core FRAMEWORK)
+if (QtCore_is_framework)
+    # Get the path to the framework dir.
+    list(GET Qt5Core_INCLUDE_DIRS 0 QT_INCLUDE_DIR)
+    get_filename_component(QT_FRAMEWORK_INCLUDE_DIR "${QT_INCLUDE_DIR}/../" ABSOLUTE)
+
+    # QT_INCLUDE_DIR points to the QtCore.framework directory, so we need to adjust this to point
+    # to the actual include directory, which has include files for non-framework parts of Qt.
+    get_filename_component(QT_INCLUDE_DIR "${QT_INCLUDE_DIR}/../../include" ABSOLUTE)
+endif()
+
 # Flags that we will pass to shiboken-generator
 # --generator-set=shiboken:  tells the generator that we want to use shiboken to generate code,
 #                            a doc generator is also available
@@ -41,6 +52,15 @@ set(GENERATOR_EXTRA_FLAGS --generator-set=shiboken
                           --enable-return-value-heuristic
                           --use-isnull-as-nb_nonzero
                           -std=c++${CMAKE_CXX_STANDARD})
+
+# 2017-04-24 The protected hack can unfortunately not be disabled, because
+# Clang does produce linker errors when we disable the hack.
+# But the ugly workaround in Python is replaced by a shiboken change.
+if(WIN32 OR DEFINED AVOID_PROTECTED_HACK)
+    set(GENERATOR_EXTRA_FLAGS ${GENERATOR_EXTRA_FLAGS} --avoid-protected-hack)
+    add_definitions(-DAVOID_PROTECTED_HACK)
+endif()
+
 macro(make_path varname)
    # accepts any number of path variables
    string(REPLACE ";" "${PATH_SEP}" ${varname} "${ARGN}")
@@ -133,5 +153,5 @@ macro(CREATE_PYTHON_BINDINGS
                 LINK_FLAGS "-undefined dynamic_lookup")
         endif()
         install(TARGETS ${TARGET_NAME}
-            LIBRARY DESTINATION ${PYTHON_BINDINGS_INSTALL_PREFIX}/${TARGET_NAME})
+            LIBRARY DESTINATION ${PROJECT_NAME}_PYTHON_BINDINGS_INSTALL_PREFIX}/${TARGET_NAME})
 endmacro()

conan/conanfile.py

@@ -11,7 +11,7 @@ from conans import ConanFile, CMake, tools
 
 class KDDockWidgetsConan(ConanFile):
     name = "kddockwidgets"
-    version = "0.99.9"
+    version = "1.1.95"
     default_user = "kdab"
     default_channel = "stable"
     license = ("https://raw.githubusercontent.com/KDAB/KDDockWidgets/master/LICENSES/GPL-2.0-only.txt",
@@ -51,7 +51,7 @@ class KDDockWidgetsConan(ConanFile):
         self.cmake.definitions["KDDockWidgets_STATIC"] = self.options.build_static
         self.cmake.definitions["KDDockWidgets_EXAMPLES"] = self.options.build_examples
         self.cmake.definitions["KDDockWidgets_TESTS"] = self.options.build_tests
-        self.cmake.definitions["OPTION_BUILD_PYTHON_BINDINGS"] = self.options.build_python_bindings
+        self.cmake.definitions["KDDockWidgets_PYTHON_BINDINGS"] = self.options.build_python_bindings
         self.cmake.configure()
         self.cmake.build()
 

debian.changelog

@@ -1,3 +1,9 @@
+kddockwidgets (1.0.0) release candidate; urgency=high
+
+  * 1.0.0 final
+
+ -- Allen Winter <allen.winter@kdab.com>  Wed, 2 Sep 2020 12:00:00 -0500
+
 kddockwidgets (0.99.9) release candidate; urgency=high
 
   * 1.0.0 release candidate

docs/CMakeLists.txt

@@ -25,7 +25,7 @@ find_package(Doxygen)
 set_package_properties(Doxygen PROPERTIES
   TYPE OPTIONAL
   DESCRIPTION "API Documentation system"
-  URL "http://www.doxygen.org"
+  URL "https://www.doxygen.org"
   PURPOSE "Needed to build the API documentation."
 )
 if(DOXYGEN_DOT_EXECUTABLE)

docs/api/Doxyfile.cmake

@@ -51,7 +51,7 @@ PROJECT_BRIEF          =
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = "@CMAKE_SOURCE_DIR@/images/KDDockWidgets-64x64.png"
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
@@ -1083,35 +1083,6 @@ USE_HTAGS              = NO
 
 VERBATIM_HEADERS       = NO
 
-# If the CLANG_ASSISTED_PARSING tag is set to YES then doxygen will use the
-# clang parser (see: http://clang.llvm.org/) for more accurate parsing at the
-# cost of reduced performance. This can be particularly helpful with template
-# rich C++ code for which doxygen's built-in parser lacks the necessary type
-# information.
-# Note: The availability of this option depends on whether or not doxygen was
-# generated with the -Duse_libclang=ON option for CMake.
-# The default value is: NO.
-
-CLANG_ASSISTED_PARSING = NO
-
-# If clang assisted parsing is enabled you can provide the compiler with command
-# line options that you would normally use when invoking the compiler. Note that
-# the include paths will already be set by doxygen for the files and directories
-# specified with INPUT and INCLUDE_PATH.
-# This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES.
-
-CLANG_OPTIONS          =
-
-# If clang assisted parsing is enabled you can provide the clang parser with the
-# path to the compilation database (see:
-# http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html) used when the files
-# were built. This is equivalent to specifying the "-p" option to a clang tool,
-# such as clang-check. These options will then be passed to the parser.
-# Note: The availability of this option depends on whether or not doxygen was
-# generated with the -Duse_libclang=ON option for CMake.
-
-#TOO NEW CLANG_DATABASE_PATH    =
-
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
@@ -1225,7 +1196,8 @@ HTML_EXTRA_STYLESHEET  =
 # files will be copied as-is; there are no commands or markers available.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_FILES       = "@CMAKE_CURRENT_SOURCE_DIR@/kdab-logo-16x16.png"
+HTML_EXTRA_FILES       = "@CMAKE_CURRENT_SOURCE_DIR@/kdab-logo-16x16.png" \
+                         "@CMAKE_CURRENT_SOURCE_DIR@/kdab-kddockwidgets-logo-16x16.png"
 
 # The HTML_COLORSTYLE_HUE tag controls the color of the HTML output. Doxygen
 # will adjust the colors in the style sheet and background images according to

docs/api/footer.html

@@ -3,16 +3,16 @@
       <img src="kdab-logo-16x16.png">
       <font style="font-weight: bold;">Klar&auml;lvdalens Datakonsult AB (KDAB)</font>
       <br>
-      "The Qt Experts"<br>
+      "The Qt, C++ and OpenGL Experts"<br>
       <a href="https://www.kdab.com/">https://www.kdab.com/</a>
     </div>
 
     <div style="text-align: right;">
-<!--        <img src="kddockwidgets-logo-16x16.png" /><br> -->
+        <img src="kdab-kddockwidgets-logo-16x16.png" />
       <font style="font-weight: bold;">KDDockWidgets</font>
       <br>
       Advanced Dock Widget Framework for Qt<br>
-      <a href="https://www.kdab.com/development-resources/qt-tools/kd-dockwidgets/">https://www.kdab.com/development-resources/qt-tools/kd-dockwidgets/</a>
+      <a href="https://www.kdab.com/development-resources/qt-tools/kddockwidgets/">https://www.kdab.com/development-resources/qt-tools/kddockwidgets/</a>
     </div>
 
   </body>

examples/dockwidgets/MyFrameworkWidgetFactory.cpp

@@ -32,6 +32,8 @@ public:
         init();
     }
 
+    ~MyTitleBar() override;
+
     void init()
     {
         setFixedHeight(60);
@@ -56,6 +58,8 @@ public:
     }
 };
 
+MyTitleBar::~MyTitleBar() = default;
+
 // Inheriting from SeparatorWidget instead of Separator as it handles moving and mouse cursor changing
 class MySeparator : public Layouting::SeparatorWidget
 {
@@ -65,6 +69,8 @@ public:
     {
     }
 
+    ~MySeparator() override;
+
     void paintEvent(QPaintEvent *) override
     {
         QPainter p(this);
@@ -72,6 +78,8 @@ public:
     }
 };
 
+MySeparator::~MySeparator() = default;
+
 KDDockWidgets::TitleBar * CustomWidgetFactory::createTitleBar(KDDockWidgets::Frame *frame) const
 {
     return new MyTitleBar(frame);

examples/dockwidgets/MyWidget.cpp

@@ -36,13 +36,13 @@ MyWidget::MyWidget(const QString &backgroundFile, const QString &logoFile, QWidg
     }
 
     setFocusPolicy(Qt::StrongFocus);
-#if 0
+    if (qEnvironmentVariableIsSet("KDDW_DEBUG_FOCUS")) {
         // Uncomment to show focus propagation working
         new QLineEdit(this);
         auto l2 = new QLineEdit(this);
         l2->move(0, 100);
         setFocusProxy(l2);
-#endif
+    }
 }
 
 MyWidget::~MyWidget()

examples/dockwidgets/main.cpp

@@ -37,6 +37,7 @@ int main(int argc, char **argv)
     parser.setApplicationDescription("KDDockWidgets example application");
     parser.addHelpOption();
 
+    // Fusion looks better in general, but feel free to change
     qApp->setStyle(QStyleFactory::create(QStringLiteral("Fusion")));
 
     QCommandLineOption customStyle("p", QCoreApplication::translate("main", "Shows how to style framework internals via FrameworkWidgetFactory"));
@@ -78,12 +79,18 @@ int main(int argc, char **argv)
     QCommandLineOption nonDockable("d", QCoreApplication::translate("main", "DockWidget #9 will be non-dockable"));
     parser.addOption(nonDockable);
 
-    QCommandLineOption maximizeButton("b", QCoreApplication::translate("main", "DockWidgets have maximize/restore buttons instead of float/dock button"));
+    QCommandLineOption maximizeButtonOption("b", QCoreApplication::translate("main", "Floating dockWidgets have maximize/restore buttons instead of float/dock button"));
-    parser.addOption(maximizeButton);
+    parser.addOption(maximizeButtonOption);
+
+    QCommandLineOption minimizeButtonOption("k", QCoreApplication::translate("main", "Floating dockWidgets have a minimize button. Implies not being an utility window (~Qt::Tool)"));
+    parser.addOption(minimizeButtonOption);
 
     QCommandLineOption segmentedIndicators("y", QCoreApplication::translate("main", "Use segmented indicators instead of classical"));
     parser.addOption(segmentedIndicators);
 
+    QCommandLineOption noUtilityWindows("u", QCoreApplication::translate("main", "FloatingWindows will be normal windows instead of utility windows"));
+    parser.addOption(noUtilityWindows);
+
     parser.addPositionalArgument("savedlayout", QCoreApplication::translate("main", "loads the specified json file at startup"));
 
 #ifdef KDDOCKWIDGETS_SUPPORTS_NESTED_MAINWINDOWS
@@ -95,8 +102,22 @@ int main(int argc, char **argv)
     parser.addOption(maxSizeOption);
 
     QCommandLineOption centralFrame("f", QCoreApplication::translate("main", "Persistent central frame"));
+
+    QCommandLineOption autoHideSupport("w", QCoreApplication::translate("main", "Enables auto-hide/minimization to side-bar support"));
+    parser.addOption(autoHideSupport);
+
 #if defined(DOCKS_DEVELOPER_MODE)
     parser.addOption(centralFrame);
+
+    QCommandLineOption noQtTool("no-qttool", QCoreApplication::translate("main", "(internal) Don't use Qt::Tool"));
+    QCommandLineOption noParentForFloating("no-parent-for-floating", QCoreApplication::translate("main", "(internal) FloatingWindows won't have a parent"));
+    parser.addOption(noQtTool);
+    parser.addOption(noParentForFloating);
+
+# if defined(Q_OS_WIN)
+    QCommandLineOption noAeroSnap("no-aero-snap", QCoreApplication::translate("main", "(internal) Disable AeroSnap"));
+    parser.addOption(noAeroSnap);
+# endif
 #else
     Q_UNUSED(centralFrame)
 #endif
@@ -114,15 +135,33 @@ int main(int argc, char **argv)
         KDDockWidgets::DefaultWidgetFactory::s_dropIndicatorType = KDDockWidgets::DropIndicatorType::Segmented;
 
     MainWindowOptions options = MainWindowOption_None;
+    auto flags = KDDockWidgets::Config::self().flags();
 #if defined(DOCKS_DEVELOPER_MODE)
     options = parser.isSet(centralFrame) ? MainWindowOption_HasCentralFrame
                                          : MainWindowOption_None;
+
+    if (parser.isSet(noQtTool))
+        flags |= KDDockWidgets::Config::Flag_internal_DontUseQtToolWindowsForFloatingWindows;
+
+    if (parser.isSet(noParentForFloating))
+        flags |= KDDockWidgets::Config::Flag_internal_DontUseParentForFloatingWindows;
+
+# if defined(Q_OS_WIN)
+    if (parser.isSet(noAeroSnap))
+        flags &= ~KDDockWidgets::Config::Flag_AeroSnapWithClientDecos;
 # endif
 
-    auto flags = KDDockWidgets::Config::self().flags();
+#endif
+
+    if (parser.isSet(autoHideSupport))
+        flags |= Config::Flag_AutoHideSupport;
+
     if (parser.isSet(noTitleBars))
         flags |= KDDockWidgets::Config::Flag_HideTitleBarWhenTabsVisible;
 
+    if (parser.isSet(noUtilityWindows))
+        flags |= KDDockWidgets::Config::Flag_DontUseUtilityFloatingWindows;
+
     if (parser.isSet(alwaysTabs))
         flags |= KDDockWidgets::Config::Flag_AlwaysShowTabs;
 
@@ -134,15 +173,18 @@ int main(int argc, char **argv)
         }
     }
 
-    if (parser.isSet(customStyle))
+    if (parser.isSet(customStyle) || qEnvironmentVariableIsSet("KDDW_DEBUG_FOCUS"))
         flags |= KDDockWidgets::Config::Flag_TitleBarIsFocusable; // also showing title bar focus with -p, just to not introduce another switch
 
     if (parser.isSet(reorderTabsOption))
         flags |= KDDockWidgets::Config::Flag_AllowReorderTabs;
 
-    if (parser.isSet(maximizeButton))
+    if (parser.isSet(maximizeButtonOption))
         flags |= KDDockWidgets::Config::Flag_TitleBarHasMaximizeButton;
 
+    if (parser.isSet(minimizeButtonOption))
+        flags |= KDDockWidgets::Config::Flag_TitleBarHasMinimizeButton;
+
     if (parser.isSet(lazyResizeOption))
         flags |= KDDockWidgets::Config::Flag_LazyResize;
 

examples/minimal/MyWidget.h

@@ -24,6 +24,7 @@ class MyWidget : public QWidget
 {
     Q_OBJECT
 public:
+    MyWidget() = default;
     explicit MyWidget(const QString &backgroundFile, const QString &logoFile, QWidget *parent = nullptr);
     ~MyWidget();
 protected:

examples/minimal/main.cpp

@@ -14,6 +14,8 @@
 #include <kddockwidgets/DockWidget.h>
 #include <kddockwidgets/MainWindow.h>
 
+#include <QStyleFactory>
+
 // clazy:excludeall=qstring-allocations
 
 using namespace KDDockWidgets;
@@ -27,6 +29,9 @@ int main(int argc, char **argv)
     app.setOrganizationName(QStringLiteral("KDAB"));
     app.setApplicationName(QStringLiteral("Test app"));
 
+    // Fusion looks better in general, but feel free to change
+    qApp->setStyle(QStyleFactory::create(QStringLiteral("Fusion")));
+
     // # 1. Create our main window
 
     KDDockWidgets::MainWindow mainWindow(QStringLiteral("MyMainWindow"));
@@ -34,10 +39,9 @@ int main(int argc, char **argv)
     mainWindow.resize(1200, 1200);
     mainWindow.show();
 
-    // # 2. Create four dock widgets. Each needs an unique name.
+    // # 2. Create a dock widget, it needs a unique name
     auto dock1 = new KDDockWidgets::DockWidget(QStringLiteral("MyDock1"));
-    auto widget1 = new MyWidget(QStringLiteral(":/assets/base.png"),
+    auto widget1 = new MyWidget();
-                                QStringLiteral(":/assets/KDAB_bubble_fulcolor.png"));
     dock1->setWidget(widget1);
 
     auto dock2 = new KDDockWidgets::DockWidget(QStringLiteral("MyDock2"));

examples/qtquick/main.cpp

@@ -22,12 +22,15 @@ int main(int argc, char *argv[])
     QGuiApplication app(argc, argv);
 
     QQuickView view;
+    view.setObjectName("MainWindow QQuickView");
     KDDockWidgets::Config::self().setQmlEngine(view.engine());
     view.resize(1000, 800);
     view.show();
     view.setResizeMode(QQuickView::SizeRootObjectToView);
 
     auto dw1 = new KDDockWidgets::DockWidgetQuick("Dock #1");
+    view.setSource(QUrl("qrc:/main.qml"));
+
     dw1->setWidget(QStringLiteral("qrc:/Guest1.qml"));
     dw1->resize(QSize(800, 800));
     dw1->show();
@@ -42,8 +45,6 @@ int main(int argc, char *argv[])
     dw3->resize(QSize(800, 800));
     dw3->show();
 
-    view.setSource(QUrl("qrc:/main.qml"));
-
     dw1->addDockWidgetToContainingWindow(dw3, KDDockWidgets::Location_OnRight);
 
     KDDockWidgets::MainWindowBase *mainWindow = KDDockWidgets::DockRegistry::self()->mainwindows().constFirst();

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images/KDDockWidgets-banner.svg

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+       inkscape:export-ydpi="90" />
+    <path
+       style="fill:none;stroke:url(#linearGradient2184);stroke-width:0.739863;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 1090.0543,367.24694 93.9075,93.8862"
+       id="path2182"
+       sodipodi:nodetypes="cc"
+       inkscape:export-xdpi="90"
+       inkscape:export-ydpi="90" />
+  </g>
+</svg>

kddockwidgets.dsc

@@ -1,10 +1,10 @@
 Format: 1.0
 Source: kddockwidgets
-Version: 0.99.9
+Version: 1.0.0
 Binary: kddockwidgets
 Maintainer: Allen Winter <allen.winter@kdab.com>
 Architecture: any
 Build-Depends: debhelper (>=9), cdbs, cmake, qt5-default, qtbase5-dev, libqt5x11extras5-dev
 
 Files:
- 00000000000000000000000000000000 00000 kddockwidgets-0.99.9.tar.gz
+ 00000000000000000000000000000000 00000 kddockwidgets-1.0.0.tar.gz

kddockwidgets.spec

@@ -1,5 +1,5 @@
 Name:           kddockwidgets
-Version:        0.99.9
+Version:        1.0.0
 Release:        1
 Summary:        KDAB's Dock Widget Framework for Qt
 Source0:        %{name}-%{version}.tar.gz
@@ -88,5 +88,7 @@ cmake . -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release
 %{_libdir}/libkddockwidgets_multisplitter.so
 
 %changelog
+* Wed Sep 02 2020 Allen Winter <allen.winter@kdb.com> 1.0.0
+  1.0.0 final
 * Thu Aug 06 2020 Allen Winter <allen.winter@kdb.com> 0.99.9
   1.0.0 release candidate

python/PyKDDockWidgets/CMakeLists.txt

@@ -78,4 +78,4 @@ create_python_bindings(
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/__init__.py ${CMAKE_CURRENT_BINARY_DIR}/__init__.py)
 
 # install
-install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/__init__.py DESTINATION ${PYTHON_BINDINGS_INSTALL_PREFIX}/PyKDDockWidgets)
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/__init__.py DESTINATION ${PROJECT_NAME}_PYTHON_BINDINGS_INSTALL_PREFIX}/PyKDDockWidgets)

python/PyKDDockWidgets/typesystem_kddockwidgets.xml

@@ -11,6 +11,7 @@
         <!-- this is used in a public virtual pure function we need to declare it
             otherwise shiboken will ignore the function and will fail to create a wrapper -->
         <primitive-type name="DropAreaWithCentralFrame"/>
+        <primitive-type name="SideBar"/>
 
         <!-- Some plublic enum and flags -->
         <enum-type name="Location"/>
@@ -19,6 +20,9 @@
         <enum-type name="RestoreOption" flags="RestoreOptions"/>
         <enum-type name="DefaultSizeMode"/>
         <enum-type name="FrameOption" flags="FrameOptions"/>
+        <enum-type name="DropIndicatorType"/>
+        <enum-type name="SideBarLocation"/>
+        <enum-type name="TitleBarButtonType"/>
 
         <!-- our classes
              For class we can use two types:
@@ -32,6 +36,7 @@
             <!-- this class contains a internal enum, so it should be declared
                  inside of the object-type -->
             <enum-type name="Option" flags="Options" />
+            <enum-type name="IconPlace" flags="IconPlaces" />
         </object-type>
 
         <object-type name="DockWidget" />

src/CMakeLists.txt

@@ -37,6 +37,7 @@ set(DOCKSLIBS_SRCS
     private/FloatingWindow.cpp
     private/Logging.cpp
     private/TitleBar.cpp
+    private/SideBar.cpp
     private/DockRegistry.cpp
     private/Draggable.cpp
     private/WindowBeingDragged.cpp
@@ -61,16 +62,20 @@ set(DOCKS_INSTALLABLE_INCLUDES
 )
 
 set(DOCKS_INSTALLABLE_PRIVATE_INCLUDES
+    private/DragController_p.h
     private/Draggable_p.h
     private/DropIndicatorOverlayInterface_p.h
     private/FloatingWindow_p.h
     private/Frame_p.h
+    private/SideBar_p.h
     private/TitleBar_p.h
+    private/WindowBeingDragged_p.h
 )
 
 set(DOCKS_INSTALLABLE_PRIVATE_WIDGET_INCLUDES
     private/widgets/QWidgetAdapter_widgets_p.h
     private/widgets/TitleBarWidget_p.h
+    private/widgets/SideBarWidget_p.h
     private/widgets/FloatingWindowWidget_p.h
     private/widgets/FrameWidget_p.h
     private/widgets/TabBarWidget_p.h
@@ -78,7 +83,7 @@ set(DOCKS_INSTALLABLE_PRIVATE_WIDGET_INCLUDES
     private/widgets/TabWidget_p.h
 )
 
-if(OPTION_QTQUICK)
+if(${PROJECT_NAME}_QTQUICK)
   set(DOCKSLIBS_SRCS ${DOCKSLIBS_SRCS}
       private/quick/DockWidgetQuick.cpp
       private/quick/QWidgetAdapter_quick.cpp
@@ -99,6 +104,7 @@ else()
       private/widgets/TabBarWidget.cpp
       private/widgets/FloatingWindowWidget.cpp
       private/widgets/FrameWidget.cpp
+      private/widgets/SideBarWidget.cpp
       private/widgets/TabWidgetWidget.cpp
       private/widgets/TitleBarWidget.cpp
       private/widgets/DockWidget.cpp
@@ -161,13 +167,15 @@ if(CMAKE_COMPILER_IS_GNUCXX OR IS_CLANG_BUILD)
   endif()
 endif()
 
-if(OPTION_QTQUICK)
+if(${PROJECT_NAME}_QTQUICK)
-  target_link_libraries(kddockwidgets PUBLIC Qt5::Widgets Qt5::Quick Qt5::QuickControls2 kddockwidgets_multisplitter)
+  target_link_libraries(kddockwidgets PUBLIC Qt5::Widgets Qt5::Quick Qt5::QuickControls2 kddockwidgets_multisplitter PRIVATE Qt5::GuiPrivate)
 else()
-  target_link_libraries(kddockwidgets PUBLIC Qt5::Widgets kddockwidgets_multisplitter)
+  target_link_libraries(kddockwidgets PUBLIC Qt5::Widgets kddockwidgets_multisplitter PRIVATE Qt5::GuiPrivate)
 endif()
 
-if(NOT WIN32 AND NOT APPLE)
+if (WIN32)
+    target_link_libraries(kddockwidgets PRIVATE Dwmapi)
+elseif(NOT APPLE)
     find_package(Qt5X11Extras)
     target_link_libraries(kddockwidgets PUBLIC Qt5::X11Extras)
 endif()
@@ -224,11 +232,11 @@ install(FILES "${CMAKE_CURRENT_BINARY_DIR}/KDDockWidgetsConfig.cmake"
         DESTINATION ${INSTALL_LIBRARY_DIR}/cmake/KDDockWidgets
 )
 
-if(OPTION_DEVELOPER_MODE)
+if(${PROJECT_NAME}_DEVELOPER_MODE)
   # Under developer mode since kddw might be a sub-folder of a project setting a different value for QT_DISABLE_DEPRECATED_BEFORE
   target_compile_definitions(kddockwidgets PRIVATE QT_DISABLE_DEPRECATED_BEFORE=0x060000)
 
-  if (NOT OPTION_QTQUICK) # TODO: We can support it
+  if (NOT ${PROJECT_NAME}_QTQUICK) # TODO: We can support it
     add_executable(kddockwidgets_linter layoutlinter_main.cpp)
     target_link_libraries(kddockwidgets_linter kddockwidgets kddockwidgets_multisplitter Qt5::Widgets)
   endif()

src/Config.cpp

@@ -21,6 +21,7 @@
 #include "multisplitter/Widget_qwidget.h"
 #include "DockRegistry_p.h"
 #include "FrameworkWidgetFactory.h"
+#include "Utils_p.h"
 
 #include <QApplication>
 #include <QDebug>
@@ -83,8 +84,11 @@ Config::Flags Config::flags() const
 
 void Config::setFlags(Flags f)
 {
-    if (!DockRegistry::self()->isEmpty()) {
+    auto dr = DockRegistry::self();
-        qWarning() << Q_FUNC_INFO << "Only use this function at startup before creating any DockWidget or MainWindow";
+    if (!dr->isEmpty(/*excludeBeingDeleted=*/ true)) {
+        qWarning() << Q_FUNC_INFO << "Only use this function at startup before creating any DockWidget or MainWindow"
+                   << "; These are already created: " << dr->mainWindowsNames()
+                   << dr->dockWidgetNames() << dr->floatingWindows();
         return;
     }
 
@@ -135,7 +139,7 @@ int Config::separatorThickness() const
 
 void Config::setSeparatorThickness(int value)
 {
-    if (!DockRegistry::self()->isEmpty()) {
+    if (!DockRegistry::self()->isEmpty(/*excludeBeingDeleted=*/ true)) {
         qWarning() << Q_FUNC_INFO << "Only use this function at startup before creating any DockWidget or MainWindow";
         return;
     }
@@ -174,6 +178,9 @@ void Config::Private::fixFlags()
     if (QOperatingSystemVersion::current().majorVersion() < 10) {
         // Aero-snap requires Windows 10
         m_flags = m_flags & ~Flag_AeroSnapWithClientDecos;
+    } else {
+        // Unconditional now
+        m_flags |= Flag_AeroSnapWithClientDecos;
     }
 
     // These are mutually exclusive:
@@ -185,10 +192,18 @@ void Config::Private::fixFlags()
     // Not supported on macOS:
     m_flags = m_flags & ~Flag_AeroSnapWithClientDecos;
 #else
-    // Not supported on linux.
+    if (KDDockWidgets::isWayland()) {
+        // Native title bar is forced on Wayland. Needed for moving the window.
+        // The inner KDDW title bar is used for DnD.
+        m_flags |= Flag_NativeTitleBar;
+    } else {
+        // Not supported on linux/X11
         // On Linux, dragging the title bar of a window doesn't generate NonClientMouseEvents
+        // at least with KWin anyway. We can make this more granular and allow it for other
+        // X11 window managers
         m_flags = m_flags & ~Flag_NativeTitleBar;
         m_flags = m_flags & ~Flag_AeroSnapWithClientDecos;
+    }
 #endif
 
 #if !defined(Q_OS_WIN) && !defined(Q_OS_MACOS)

src/Config.h

@@ -55,7 +55,7 @@ public:
     enum Flag {
         Flag_None = 0, ///> No option set
         Flag_NativeTitleBar = 1, ///> Enables the Native OS title bar on OSes that support it (Windows 10, macOS), ignored otherwise. This is mutually exclusive with Flag_AeroSnap
-        Flag_AeroSnapWithClientDecos = 2, ///> Enables AeroSnap even if we're not using the native title bar. Only supported on Windows 10.
+        Flag_AeroSnapWithClientDecos = 2, ///> Deprecated. This is now default and cannot be turned off. Moving a window on Windows 10 uses native moving, as that works well across screens with different HDPI settings. There's no reason to use manual client/Qt window moving.
         Flag_AlwaysTitleBarWhenFloating = 4, ///> Floating windows will have a title bar even if Flag_HideTitleBarWhenTabsVisible is specified. Unneeded if Flag_HideTitleBarWhenTabsVisible isn't specified, as that's the default already.
         Flag_HideTitleBarWhenTabsVisible = 8, ///> Hides the title bar if there's tabs visible. The empty space in the tab bar becomes draggable.
         Flag_AlwaysShowTabs = 16, ///> Always show tabs, even if there's only one,
@@ -65,6 +65,16 @@ public:
         Flag_TitleBarHasMaximizeButton = 256, /// The title bar will have a maximize/restore button when floating. This is mutually-exclusive with the floating button (since many apps behave that way).
         Flag_TitleBarIsFocusable = 512, /// You can click the title bar and it will focus the last focused widget in the focus scope. If no previously focused widget then it focuses the user's dock widget guest, which should accept focus or use a focus proxy.
         Flag_LazyResize = 1024, /// The dock widgets are resized in a lazy manner. The actual resize only happens when you release the mouse button.
+
+        // These two are internal, for testing purposes across platforms. Use Flag_DontUseUtilityFloatingWindows instead.
+        Flag_internal_DontUseQtToolWindowsForFloatingWindows = 0x800, ///> FloatingWindows will use Qt::Window instead of Qt::Tool. Internal, use Flag_DontUseUtilityFloatingWindows instead.
+        Flag_internal_DontUseParentForFloatingWindows = 0x1000, ///> FloatingWindows won't have a parent top-level. Internal, use Flag_DontUseUtilityFloatingWindows instead.
+
+        Flag_DontUseUtilityFloatingWindows = Flag_internal_DontUseQtToolWindowsForFloatingWindows | Flag_internal_DontUseParentForFloatingWindows,
+        Flag_TitleBarHasMinimizeButton = 0x2000 | Flag_DontUseUtilityFloatingWindows, ///> The title bar will have a minimize button when floating. This implies Flag_DontUseUtilityFloatingWindows too, otherwise they wouldn't appear in the task bar.        
+        Flag_TitleBarNoFloatButton = 0x4000, ///> The TitleBar won't show the float button
+        Flag_AutoHideSupport = 0x8000 | Flag_TitleBarNoFloatButton, ///> Supports minimizing dock widgets to the side-bar.
+                                                                    ///> By default it also turns off the float button, but you can remove Flag_TitleBarNoFloatButton to have both.
         Flag_Default = Flag_AeroSnapWithClientDecos ///> The defaults
     };
     Q_DECLARE_FLAGS(Flags, Flag)

src/DockWidgetBase.cpp

@@ -22,6 +22,7 @@
 #include "FrameworkWidgetFactory.h"
 #include "private/Position_p.h"
 #include "WindowBeingDragged_p.h"
+#include "SideBar_p.h"
 
 #include <QAction>
 #include <QEvent>
@@ -57,10 +58,12 @@ public:
             }
         });
 
-        q->connect(floatAction, &QAction::toggled, q, [this] (bool enabled) {
+        q->connect(floatAction, &QAction::toggled, q, [this] (bool checked) {
             if (!m_updatingFloatAction) { // guard against recursiveness
-                q->setFloating(enabled);
+                q->setFloating(checked);
             }
+
+            Q_EMIT q->isFloatingChanged(checked);
         });
 
         toggleAction->setCheckable(true);
@@ -77,6 +80,26 @@ public:
         return qobject_cast<FloatingWindow*>(q->window());
     }
 
+    MainWindowBase *mainWindow() const
+    {
+        if (q->isWindow())
+            return nullptr;
+
+        // Note: Don't simply use window(), as the MainWindow might be embedded into something else
+        QWidgetOrQuick *p = q->parentWidget();
+        while (p) {
+            if (auto window = qobject_cast<MainWindowBase*>(p))
+                return window;
+
+            if (p->isWindow())
+                return nullptr;
+
+            p = p->parentWidget();
+        }
+
+        return nullptr;
+    }
+
     QPoint defaultCenterPosForFloating();
 
     void updateTitle();
@@ -87,7 +110,7 @@ public:
     void onDockWidgetHidden();
     void show();
     void close();
-    void restoreToPreviousPosition();
+    bool restoreToPreviousPosition();
     void maybeRestoreToPreviousPosition();
     int currentTabIndex() const;
 
@@ -244,15 +267,12 @@ bool DockWidgetBase::isFloating() const
     return fw && fw->hasSingleDockWidget();
 }
 
-void DockWidgetBase::setFloating(bool floats)
+bool DockWidgetBase::setFloating(bool floats)
 {
     const bool alreadyFloating = isFloating();
 
-    qCDebug(docking) << Q_FUNC_INFO << "yes=" << floats
-                     << "; already floating=" << alreadyFloating;
-
     if ((floats && alreadyFloating) || (!floats && !alreadyFloating))
-        return; // Nothing to do
+        return true; // Nothing to do
 
     if (floats) {
         d->saveTabIndex();
@@ -262,6 +282,7 @@ void DockWidgetBase::setFloating(bool floats)
                 qWarning() << "DockWidget::setFloating: Tabbed but no frame exists"
                            << this;
                 Q_ASSERT(false);
+                return false;
             }
 
             frame->detachTab(this);
@@ -274,9 +295,10 @@ void DockWidgetBase::setFloating(bool floats)
             if (auto fw = floatingWindow())
                 fw->setSuggestedGeometry(lastGeo, /*preserveCenter=*/true);
         }
+        return true;
     } else {
         saveLastFloatingGeometry();
-        d->restoreToPreviousPosition();
+        return d->restoreToPreviousPosition();
     }
 }
 
@@ -305,7 +327,7 @@ void DockWidgetBase::setTitle(const QString &title)
     if (title != d->title) {
         d->title = title;
         d->updateTitle();
-        Q_EMIT titleChanged();
+        Q_EMIT titleChanged(title);
     }
 }
 
@@ -430,6 +452,16 @@ bool DockWidgetBase::isMainWindow() const
     return qobject_cast<MainWindowBase*>(widget());
 }
 
+bool DockWidgetBase::isInMainWindow() const
+{
+    return d->mainWindow() != nullptr;
+}
+
+MainWindowBase* DockWidgetBase::mainWindow() const
+{
+    return d->mainWindow();
+}
+
 bool DockWidgetBase::isFocused() const
 {
     auto f = this->frame();
@@ -459,6 +491,30 @@ void DockWidgetBase::setAffinities(const QStringList &affinityNames)
     d->affinities = affinities;
 }
 
+void DockWidgetBase::moveToSideBar()
+{
+    if (MainWindowBase *m = mainWindow())
+        m->moveToSideBar(this);
+}
+
+bool DockWidgetBase::isOverlayed() const
+{
+    if (MainWindowBase *m = mainWindow())
+        return m->overlayedDockWidget() == this;
+
+    return false;
+}
+
+SideBarLocation DockWidgetBase::sideBarLocation() const
+{
+    return DockRegistry::self()->sideBarLocationForDockWidget(this);
+}
+
+bool DockWidgetBase::hasPreviousDockedLocation() const
+{
+    return d->m_lastPositions.isValid();
+}
+
 FloatingWindow *DockWidgetBase::morphIntoFloatingWindow()
 {
     qCDebug(creation) << "DockWidget::morphIntoFloatingWindow() this=" << this
@@ -471,10 +527,13 @@ FloatingWindow *DockWidgetBase::morphIntoFloatingWindow()
         QRect geo = d->m_lastPositions.lastFloatingGeometry();
         if (geo.isNull()) {
             geo = geometry();
+
+            if (!testAttribute(Qt::WA_Moved)) { // If user already moved it, we don't interfere
                 const QPoint center = d->defaultCenterPosForFloating();
                 if (!center.isNull())
                     geo.moveCenter(center);
             }
+        }
 
         auto frame = Config::self().frameworkWidgetFactory()->createFrame();
         frame->addWidget(this);
@@ -618,19 +677,24 @@ void DockWidgetBase::Private::close()
     if (Frame *frame = q->frame()) {
         frame->removeWidget(q);
         q->setParent(nullptr);
+
+        if (SideBar *sb = DockRegistry::self()->sideBarForDockWidget(q)) {
+            sb->removeDockWidget(q);
+        }
     }
 }
 
-void DockWidgetBase::Private::restoreToPreviousPosition()
+bool DockWidgetBase::Private::restoreToPreviousPosition()
 {
     if (!m_lastPositions.isValid())
-        return;
+        return false;
 
     Layouting::Item *item = m_lastPositions.lastItem();
 
     MultiSplitter *layout = DockRegistry::self()->layoutForItem(item);
     Q_ASSERT(layout);
     layout->restorePlaceholder(q, item, m_lastPositions.lastTabIndex());
+    return true;
 }
 
 void DockWidgetBase::Private::maybeRestoreToPreviousPosition()
@@ -722,7 +786,7 @@ void DockWidgetBase::onHidden(bool spontaneous)
     }
 }
 
-void DockWidgetBase::onClosed(QCloseEvent *e)
+void DockWidgetBase::onCloseEvent(QCloseEvent *e)
 {
     e->accept(); // By default we accept, means DockWidget closes
     if (d->widget)

src/DockWidgetBase.h

@@ -61,6 +61,8 @@ class DOCKS_EXPORT DockWidgetBase : public QWidget
 #endif
 {
     Q_OBJECT
+    Q_PROPERTY(bool isFocused READ isFocused NOTIFY isFocusedChanged)
+    Q_PROPERTY(bool isFloating READ isFloating WRITE setFloating NOTIFY isFloatingChanged)
 public:
     typedef QVector<DockWidgetBase *> List;
 
@@ -130,14 +132,14 @@ public:
 
     /**
      * @brief sets the widget which this dock widget hosts.
-     * @param widget widget to show inside this dock widget. Must not be null.
+     * @param widget the widget to show inside this dock widget. Must not be null.
      *
-     * Ownership for @p widget is transfered to DockWidgetBase.
+     * Ownership for @p widget is transferred to DockWidgetBase.
-     * Ownsership for any previously existing widget is transfered back to the user. Meaning if you
+     * Ownsership for any previously existing widget is transferred back to the user. Meaning if you
      * call setWidget(A) followed by setWidget(B) then A will have to be deleted by you, while B is
      * owned by the dock widget.
      */
-    void setWidget(QWidgetOrQuick *widget);
+    virtual void setWidget(QWidgetOrQuick *widget);
 
     /**
      * @brief returns the widget which this dock widget hosts
@@ -156,8 +158,10 @@ public:
     /**
      * @brief setter to make the dock widget float or dock.
      * @param floats If true makes the dock widget float, otherwise docks it.
+     *
+     * Returns true if the request was accomplished
      */
-    void setFloating(bool floats);
+    bool setFloating(bool floats);
 
     /**
      * @brief Returns the QAction that allows to hide/show the dock widget
@@ -320,12 +324,50 @@ public:
      */
     bool isMainWindow() const;
 
+    /**
+     * @brief Returns whether this dock widget is docked into a main window.
+     *
+     * Note that isFloating() returning false might either mean the dock widget is docked into a
+     * main window or into a floating window (groupped/nested with other dock widgets. Use this function
+     * then if you need to disambiguate
+     */
+    bool isInMainWindow() const;
+
+    /// @brief Returns the main window this dock widget is in. nullptr if it's not inside a main window
+    MainWindowBase *mainWindow() const;
+
     ///@brief Returns whether This or any child of this dock widget is focused
     ///Not to be confused with QWidget::hasFocus(), which just refers to 1 widget. This includes
     ///variant includes children.
     ///@sa isFocusedChanged()
     bool isFocused() const;
 
+    /**
+     * @brief Minimizes this dock widget to the MainWindow's side-bar.
+     *
+     * It will be undocked from current layout. It's previous docked position will be remembered.
+     *
+     * This action is only available if the dock widget is docked into a MainWindow.
+     * The dockwidget will initially be visible and overlayed on top of the current layout (this is
+     * the auto-hide feature).
+     */
+    void moveToSideBar();
+
+    /// @brief Returns whether this dock widget is overlayed on top of the main window, instead of
+    /// docked into the layout. This is only relevant when using the auto-hide and side-bar feature.
+    bool isOverlayed() const;
+
+    ///@brief Returns whether this dock widget is in a side bar, and which.
+    /// SideBarLocation::None is returned if it's not in a sidebar.
+    /// This is only relevant when using the auto-hide and side-bar feature.
+    SideBarLocation sideBarLocation() const;
+
+    /// @brief Returns whether this floating dock widget knows its previous docked location
+    /// Result only makes sense if it's floating.
+    ///
+    /// When you call dockWidget->setFloating(false) it will only dock if it knows where to.
+    bool hasPreviousDockedLocation() const;
+
 Q_SIGNALS:
     ///@brief signal emitted when the parent changed
     void parentChanged();
@@ -340,7 +382,8 @@ Q_SIGNALS:
     void iconChanged();
 
     ///@brief signal emitted when the title changed
-    void titleChanged();
+    ///@param title the new title
+    void titleChanged(const QString &title);
 
     ///@brief emitted when the hosted widget changed
     void widgetChanged(KDDockWidgets::QWidgetOrQuick *);
@@ -353,11 +396,24 @@ Q_SIGNALS:
     ///@sa isFocused
     void isFocusedChanged(bool);
 
+    ///@brief emitted when isOverlayed changes
+    ///@sa isOverlayed
+    void isOverlayedChanged(bool);
+
+    ///@brief emitted when isFloating changes
+    bool isFloatingChanged(bool);
+
+    ///@brief emitted when this dock widget is removed from a side-bar.
+    ///Only relevant for the auto-hide/sidebar feature
+    void removedFromSideBar();
+
 protected:
     void onParentChanged();
     void onShown(bool spontaneous);
     void onHidden(bool spontaneous);
-    void onClosed(QCloseEvent *e);
+#ifndef PYTHON_BINDINGS //Pyside bug: https://bugreports.qt.io/projects/PYSIDE/issues/PYSIDE-1327
+    void onCloseEvent(QCloseEvent *e) override;
+#endif
 
 #if defined(DOCKS_DEVELOPER_MODE)
 public Q_SLOTS:
@@ -390,6 +446,7 @@ private:
     friend class KDDockWidgets::DragController;
     friend class KDDockWidgets::DockRegistry;
     friend class KDDockWidgets::LayoutSaver;
+    friend class KDDockWidgets::MainWindowBase;
 
     /**
      * @brief the Frame which contains this dock widgets.

src/FocusScope.cpp

@@ -40,6 +40,8 @@ public:
         m_inCtor = false;
     }
 
+    ~Private() override;
+
     void setIsFocused(bool);
     void onFocusObjectChanged(QObject *);
     bool isInFocusScope(WidgetType *) const;
@@ -51,6 +53,9 @@ public:
     QPointer<WidgetType> m_lastFocusedInScope;
 };
 
+FocusScope::Private::~Private()
+{
+}
 
 FocusScope::FocusScope(QWidgetAdapter *thisWidget)
     : d(new Private(this, thisWidget))

src/FocusScope.h

@@ -30,7 +30,7 @@ class FocusScope
 public:
     ///@brief constructor
     explicit FocusScope(QWidgetAdapter *thisWidget);
-    ~FocusScope();
+    virtual ~FocusScope();
 
     ///@brief Returns true if this FocusScope is focused.
     ///This is similar to the QWidget::hasFocus(), except that it counts with the children being focused too.

src/FrameworkWidgetFactory.cpp

@@ -23,11 +23,14 @@
 # include "widgets/FrameWidget_p.h"
 # include "widgets/TitleBarWidget_p.h"
 # include "widgets/TabBarWidget_p.h"
+# include "widgets/SideBarWidget_p.h"
 # include "widgets/TabWidgetWidget_p.h"
 # include "multisplitter/Separator_qwidget.h"
 # include "widgets/FloatingWindowWidget_p.h"
 # include "indicators/SegmentedIndicators_p.h"
+
 # include <QRubberBand>
+# include <QToolButton>
 #else
 # include "quick/FrameQuick_p.h"
 # include "quick/DockWidgetQuick.h"
@@ -102,6 +105,24 @@ QWidgetOrQuick *DefaultWidgetFactory::createRubberBand(QWidgetOrQuick *parent) c
     return new QRubberBand(QRubberBand::Rectangle, parent);
 }
 
+SideBar *DefaultWidgetFactory::createSideBar(SideBarLocation loc, MainWindowBase *parent) const
+{
+    return new SideBarWidget(loc, parent);
+}
+
+QAbstractButton* DefaultWidgetFactory::createTitleBarButton(QWidget *parent, TitleBarButtonType type) const
+{
+    if (!parent) {
+        qWarning() << Q_FUNC_INFO << "Parent not provided";
+        return nullptr;
+    }
+
+    auto button = new Button(parent);
+    button->setIcon(iconForButtonType(type, parent->devicePixelRatioF()));
+
+    return button;
+}
+
 #else
 
 Frame *DefaultWidgetFactory::createFrame(QWidgetOrQuick *parent, FrameOptions options) const
@@ -163,4 +184,69 @@ QWidgetOrQuick *DefaultWidgetFactory::createRubberBand(QWidgetOrQuick *parent) c
     return new QWidgetOrQuick(parent);
 }
 
+SideBar *DefaultWidgetFactory::createSideBar(SideBarLocation loc, MainWindowBase *parent) const
+{
+    Q_UNUSED(loc);
+    Q_UNUSED(parent);
+
+    qWarning() << Q_FUNC_INFO << "Not implemented yet";
+    return nullptr;
+}
+
+#endif // QtQuick
+
+// iconForButtonType impl is the same for QtQuick and QtWidgets
+QIcon DefaultWidgetFactory::iconForButtonType(TitleBarButtonType type, qreal dpr) const
+{
+    QString iconName;
+    switch (type) {
+    case TitleBarButtonType::AutoHide:
+        iconName = QStringLiteral("auto-hide");
+        break;
+    case TitleBarButtonType::UnautoHide:
+        iconName = QStringLiteral("unauto-hide");
+        break;
+    case TitleBarButtonType::Close:
+        iconName = QStringLiteral("close");
+        break;
+    case TitleBarButtonType::Minimize:
+        iconName = QStringLiteral("min");
+        break;
+    case TitleBarButtonType::Maximize:
+        iconName = QStringLiteral("max");
+        break;
+    case TitleBarButtonType::Normal:
+        // We're using the same icon as dock/float
+        iconName = QStringLiteral("dock-float");
+        break;
+    case TitleBarButtonType::Float:
+        iconName = QStringLiteral("dock-float");
+        break;
+    }
+
+    if (iconName.isEmpty())
+        return {};
+
+    QIcon icon(QStringLiteral(":/img/%1.png").arg(iconName));
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
+    const bool isFractional = int(dpr) != dpr;
+    if (isFractional) {
+        // We don't support 1.5x yet.
+        // Linux is the only one affected as Windows and macOS use integral factors.
+        // Problem with Linux is that rendering is off due to a rounding bug only fixed in 5.15.2
+        // Will enable for fractional later.
+        // QTBUG-86170
+        return icon;
+    }
+#else
+    // Not using Qt's sugar syntax, which doesn't support 1.5x anyway when we need it.
+    // Simply add the high-res files and Qt will pick them when needed
+
+    icon.addFile(QStringLiteral(":/img/%1-1.5x.png").arg(iconName));
+    Q_UNUSED(dpr);
 #endif
+    icon.addFile(QStringLiteral(":/img/%1-2x.png").arg(iconName));
+
+    return icon;
+}

src/FrameworkWidgetFactory.h

@@ -23,6 +23,10 @@
  * @author Sérgio Martins \<sergio.martins@kdab.com\>
  */
 
+QT_BEGIN_NAMESPACE
+class QAbstractButton;
+QT_END_NAMESPACE
+
 namespace Layouting {
 class Separator;
 class Widget;
@@ -37,6 +41,7 @@ class TabWidget;
 class TitleBar;
 class Frame;
 class DropArea;
+class SideBar;
 class TabBar;
 
 /**
@@ -121,6 +126,23 @@ public:
     ///@brief Called internally by the framework to create a RubberBand to show as drop zone
     ///Returns a rubber band
     virtual QWidgetOrQuick *createRubberBand(QWidgetOrQuick *parent) const = 0;
+
+    ///@brief Called internally by the framework to create a SideBar
+    ///@param loc The side-bar location without the main window. Just forward into your SideBar sub-class ctor.
+    ///@param parent The MainWindow. Just forward into your SideBar sub-class ctor.
+    virtual SideBar *createSideBar(SideBarLocation loc, MainWindowBase *parent) const = 0;
+
+#ifdef KDDOCKWIDGETS_QTWIDGETS
+    ///@brief Called internally by the framework to create a title bar button
+    ///@parent the button's parent
+    virtual QAbstractButton* createTitleBarButton(QWidget *parent, TitleBarButtonType) const = 0;
+#else
+    // QtQuick will have some other base class for buttons
+#endif
+
+    /// @brief Returns the icon to be used with the specified @p type
+    /// @param dpr the device pixel ratio of the button
+    virtual QIcon iconForButtonType(TitleBarButtonType type, qreal dpr) const = 0;
 private:
     Q_DISABLE_COPY(FrameworkWidgetFactory)
 };
@@ -142,6 +164,13 @@ public:
     FloatingWindow *createFloatingWindow(Frame *frame, MainWindowBase *parent = nullptr) const override;
     DropIndicatorOverlayInterface *createDropIndicatorOverlay(DropArea*) const override;
     QWidgetOrQuick *createRubberBand(QWidgetOrQuick *parent) const override;
+    SideBar *createSideBar(SideBarLocation loc, MainWindowBase *parent) const override;
+
+#ifdef KDDOCKWIDGETS_QTWIDGETS
+    QAbstractButton* createTitleBarButton(QWidget *parent, TitleBarButtonType) const override;
+#endif
+
+    QIcon iconForButtonType(TitleBarButtonType type, qreal dpr) const override;
 
     static DropIndicatorType s_dropIndicatorType;
 private:

src/KDDockWidgets.h

@@ -53,7 +53,8 @@ namespace KDDockWidgets
     enum FrameOption {
         FrameOption_None = 0,
         FrameOption_AlwaysShowsTabs = 1,
-        FrameOption_IsCentralFrame = 2
+        FrameOption_IsCentralFrame = 2,
+        FrameOption_IsOverlayed = 4
     };
     Q_DECLARE_FLAGS(FrameOptions, FrameOption)
 
@@ -96,6 +97,32 @@ namespace KDDockWidgets
 
         return QString();
     }
+
+    /// @brief Each main window supports 4 sidebars
+    enum class SideBarLocation {
+        None,
+        North,
+        East,
+        West,
+        South
+    };
+
+    ///@brief describes a type of button you can have in the title bar
+    enum class TitleBarButtonType {
+        Close,
+        Float,
+        Minimize,
+        Maximize,
+        Normal, // Restore from maximized state
+        AutoHide,
+        UnautoHide
+    };
+
+    ///@internal
+    inline uint qHash(SideBarLocation loc, uint seed)
+    {
+        return ::qHash(static_cast<uint>(loc), seed);
+    }
 }
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(KDDockWidgets::FrameOptions)

src/KDDockWidgetsConfig.cmake.in

@@ -12,7 +12,7 @@
 include(CMakeFindDependencyMacro)
 
 find_dependency(Qt5Widgets REQUIRED)
-if (@OPTION_QTQUICK@)
+if (@KDDockWidgets_QTQUICK@)
     find_dependency(Qt5Quick REQUIRED)
 endif()
 

src/LayoutSaver.cpp

@@ -163,7 +163,7 @@ QByteArray LayoutSaver::serializeLayout() const
             layout.mainWindows.push_back(mainWindow->serialize());
     }
 
-    const QVector<KDDockWidgets::FloatingWindow*> floatingWindows = d->m_dockRegistry->nestedwindows();
+    const QVector<KDDockWidgets::FloatingWindow*> floatingWindows = d->m_dockRegistry->floatingWindows();
     layout.floatingWindows.reserve(floatingWindows.size());
     for (KDDockWidgets::FloatingWindow *floatingWindow : floatingWindows) {
         if (d->matchesAffinity(floatingWindow->affinities()))

src/MainWindow.cpp

@@ -17,10 +17,13 @@
  */
 
 #include "MainWindow.h"
+#include "Config.h"
 #include "DropArea_p.h"
 #include "Frame_p.h"
 #include "Logging_p.h"
+#include "SideBar_p.h"
 #include "DropAreaWithCentralFrame_p.h"
+#include "FrameworkWidgetFactory.h"
 
 #include <QApplication>
 #include <QVBoxLayout>
@@ -31,11 +34,21 @@ using namespace KDDockWidgets;
 class MainWindow::Private
 {
 public:
-    explicit Private(MainWindowOptions, MainWindowBase *)
-    {
-    }
-};
 
+    explicit Private(MainWindowOptions, MainWindowBase *mainWindow)
+        : m_supportsAutoHide(Config::self().flags() & Config::Flag_AutoHideSupport)
+    {
+        if (m_supportsAutoHide) {
+            for (auto location : { SideBarLocation::North, SideBarLocation::East,
+                                   SideBarLocation::West, SideBarLocation::South}) {
+                m_sideBars.insert(location, Config::self().frameworkWidgetFactory()->createSideBar(location, mainWindow) );
+            }
+        }
+    }
+
+    const bool m_supportsAutoHide;
+    QHash<SideBarLocation, SideBar*> m_sideBars;
+};
 
 namespace KDDockWidgets {
 class MyCentralWidget : public QWidget
@@ -67,9 +80,24 @@ MainWindow::MainWindow(const QString &name, MainWindowOptions options,
     , d(new Private(options, this))
 {
     auto centralWidget = new MyCentralWidget(this);
-    auto layout = new QVBoxLayout(centralWidget);
+    auto layout = new QHBoxLayout(centralWidget);  // 1 level of indirection so we can add some margins
-    layout->setContentsMargins(1, 5, 1, 1);
+    layout->setSpacing(0);
-    layout->addWidget(dropArea()); // 1 level of indirection so we can add some margins
+    layout->setContentsMargins(centerWidgetMargins());
+
+    if (d->m_supportsAutoHide) {
+        layout->addWidget(sideBar(SideBarLocation::West));
+        auto innerVLayout = new QVBoxLayout();
+        innerVLayout->setSpacing(0);
+        innerVLayout->setContentsMargins(0, 0, 0, 0);
+        innerVLayout->addWidget(sideBar(SideBarLocation::North));
+        innerVLayout->addWidget(dropArea());
+        innerVLayout->addWidget(sideBar(SideBarLocation::South));
+        layout->addLayout(innerVLayout);
+        layout->addWidget(sideBar(SideBarLocation::East));
+    } else {
+        layout->addWidget(dropArea());
+    }
+
     setCentralWidget(centralWidget);
 
     // qApp->installEventFilter(this);
@@ -84,3 +112,24 @@ void MainWindow::setCentralWidget(QWidget *w)
 {
     QMainWindow::setCentralWidget(w);
 }
+
+SideBar *MainWindow::sideBar(SideBarLocation location) const
+{
+    return d->m_sideBars.value(location);
+}
+
+void MainWindow::resizeEvent(QResizeEvent *ev)
+{
+    MainWindowBase::resizeEvent(ev);
+    onResized(ev); // Also call our own handler, since QtQuick doesn't have resizeEvent()
+}
+
+QMargins MainWindow::centerWidgetMargins() const
+{
+    return { 1, 5, 1, 1};
+}
+
+QRect MainWindow::centralAreaGeometry() const
+{
+    return centralWidget()->geometry();
+}

src/MainWindow.h

@@ -23,6 +23,8 @@
 
 namespace KDDockWidgets {
 
+class SideBar;
+
 /**
  * @brief The QMainwindow sub-class that the application should use to be able
  * to dock KDDockWidget::DockWidget instances.
@@ -45,6 +47,13 @@ public:
     ///@brief Destructor
     ~MainWindow() override;
 
+    ///@brief returns the sidebar for the specified location
+    SideBar *sideBar(SideBarLocation) const override;
+
+protected:
+    void resizeEvent(QResizeEvent *) override;
+    QMargins centerWidgetMargins() const override;
+    QRect centralAreaGeometry() const override;
 private:
     using QMainWindow::setCentralWidget;
     void setCentralWidget(QWidget *); // overridden just to make it private

src/MainWindowBase.cpp

@@ -22,7 +22,10 @@
 #include "DropArea_p.h"
 #include "Frame_p.h"
 #include "Utils_p.h"
+#include "SideBar_p.h"
 #include "Logging_p.h"
+#include "Item_p.h"
+#include "FrameworkWidgetFactory.h"
 #include "DropAreaWithCentralFrame_p.h"
 
 using namespace KDDockWidgets;
@@ -42,15 +45,20 @@ public:
         return m_options & MainWindowOption_HasCentralFrame;
     }
 
+    QRect rectForOverlay(Frame *, SideBarLocation) const;
+    SideBarLocation preferredSideBar(DockWidgetBase *) const;
+    void updateOverlayGeometry();
+
     QString name;
     QStringList affinities;
     const MainWindowOptions m_options;
     MainWindowBase *const q;
+    QPointer<DockWidgetBase> m_overlayedDockWidget;
     DropAreaWithCentralFrame *const m_dropArea;
 };
 
 MainWindowBase::MainWindowBase(const QString &uniqueName, KDDockWidgets::MainWindowOptions options,
-                               QWidgetOrQuick *parent, Qt::WindowFlags flags)
+                               WidgetType *parent, Qt::WindowFlags flags)
     : QMainWindowOrQuick(parent, flags)
     , d(new Private(this, options))
 {
@@ -149,6 +157,295 @@ void MainWindowBase::layoutParentContainerEqually(DockWidgetBase *dockWidget)
     dropArea()->layoutParentContainerEqually(dockWidget);
 }
 
+QRect MainWindowBase::Private::rectForOverlay(Frame *frame, SideBarLocation location) const
+{
+    SideBar *sb = q->sideBar(location);
+    if (!sb)
+        return {};
+
+    const QRect centralAreaGeo = q->centralAreaGeometry();
+    const QMargins centerWidgetMargins = q->centerWidgetMargins();
+
+    QRect rect;
+    const int margin = 1;
+    switch (location) {
+    case SideBarLocation::North:
+    case SideBarLocation::South: {
+
+        SideBar *leftSideBar = q->sideBar(SideBarLocation::West);
+        SideBar *rightSideBar = q->sideBar(SideBarLocation::East);
+        const int leftSideBarWidth = (leftSideBar && leftSideBar->isVisible()) ? leftSideBar->width()
+                                                                               : 0;
+        const int rightSideBarWidth = (rightSideBar && rightSideBar->isVisible()) ? rightSideBar->width()
+                                                                                  : 0;
+        rect.setHeight(qMax(300, frame->minSize().height()));
+        rect.setWidth(centralAreaGeo.width() - margin * 2 - leftSideBarWidth - rightSideBarWidth);
+        rect.moveLeft(margin + leftSideBarWidth);
+        if (location == SideBarLocation::South) {
+            rect.moveTop(centralAreaGeo.bottom() - centerWidgetMargins.bottom() - rect.height() - sb->height());
+        } else {
+            rect.moveTop(centralAreaGeo.y() + sb->height() + centerWidgetMargins.top());
+        }
+        break;
+    }
+    case SideBarLocation::West:
+    case SideBarLocation::East: {
+        SideBar *topSideBar = q->sideBar(SideBarLocation::North);
+        SideBar *bottomSideBar = q->sideBar(SideBarLocation::South);
+        const int topSideBarHeight = (topSideBar && topSideBar->isVisible()) ? topSideBar->height()
+                                                                             : 0;
+        const int bottomSideBarHeight = (bottomSideBar && bottomSideBar->isVisible()) ? bottomSideBar->height()
+                                                                                      : 0;
+        rect.setWidth(qMax(300, frame->minSize().width()));
+        rect.setHeight(centralAreaGeo.height() - topSideBarHeight - bottomSideBarHeight - centerWidgetMargins.top() - centerWidgetMargins.bottom());
+        rect.moveTop(sb->mapTo(q, QPoint(0, 0)).y() + topSideBarHeight - 1);
+        if (location == SideBarLocation::East) {
+            rect.moveLeft(centralAreaGeo.width() - rect.width() - sb->width() - centerWidgetMargins.right() - margin);
+        } else {
+            rect.moveLeft(margin + centralAreaGeo.x() + centerWidgetMargins.left() + sb->width());
+        }
+
+        break;
+    }
+    case SideBarLocation::None:
+        break;
+    }
+
+    return rect;
+}
+
+static SideBarLocation opposedSideBarLocationForBorder(Layouting::Item::LayoutBorderLocation loc)
+{
+    switch (loc) {
+    case Layouting::Item::LayoutBorderLocation_North:
+        return SideBarLocation::South;
+    case Layouting::Item::LayoutBorderLocation_East:
+        return SideBarLocation::West;
+    case Layouting::Item::LayoutBorderLocation_West:
+        return SideBarLocation::East;
+    case Layouting::Item::LayoutBorderLocation_South:
+        return SideBarLocation::North;
+    case Layouting::Item::LayoutBorderLocation_All:
+    case Layouting::Item::LayoutBorderLocation_Verticals:
+    case Layouting::Item::LayoutBorderLocation_Horizontals:
+    case Layouting::Item::LayoutBorderLocation_None:
+        break;
+    }
+
+    qWarning() << Q_FUNC_INFO << "Unknown loc" << loc;
+    return SideBarLocation::None;
+}
+
+static SideBarLocation sideBarLocationForBorder(Layouting::Item::LayoutBorderLocations loc)
+{
+    switch (loc) {
+    case Layouting::Item::LayoutBorderLocation_North:
+        return SideBarLocation::North;
+    case Layouting::Item::LayoutBorderLocation_East:
+        return SideBarLocation::East;
+    case Layouting::Item::LayoutBorderLocation_West:
+        return SideBarLocation::West;
+    case Layouting::Item::LayoutBorderLocation_South:
+        return SideBarLocation::South;
+    case Layouting::Item::LayoutBorderLocation_All:
+    case Layouting::Item::LayoutBorderLocation_Verticals:
+    case Layouting::Item::LayoutBorderLocation_Horizontals:
+    case Layouting::Item::LayoutBorderLocation_None:
+        break;
+    }
+
+    return SideBarLocation::None;
+}
+
+SideBarLocation MainWindowBase::Private::preferredSideBar(DockWidgetBase *dw) const
+{
+    // TODO: Algorithm can still be made smarter
+
+    Layouting::Item *item = q->multiSplitter()->itemForFrame(dw->frame());
+    if (!item) {
+        qWarning() << Q_FUNC_INFO << "No item for dock widget";
+        return SideBarLocation::None;
+    }
+
+    const Layouting::Item::LayoutBorderLocations borders = item->adjacentLayoutBorders();
+    const qreal aspectRatio = dw->width() / (dw->height() * 1.0);
+
+    /// 1. It's touching all borders
+    if (borders == Layouting::Item::LayoutBorderLocation_All) {
+        return aspectRatio > 1.0 ? SideBarLocation::South
+                                 : SideBarLocation::East;
+    }
+
+    /// 2. It's touching 3 borders
+    for (auto borderLoc : { Layouting::Item::LayoutBorderLocation_North, Layouting::Item::LayoutBorderLocation_East,
+                            Layouting::Item::LayoutBorderLocation_West, Layouting::Item::LayoutBorderLocation_South }) {
+        if (borders == (Layouting::Item::LayoutBorderLocation_All & ~borderLoc))
+            return opposedSideBarLocationForBorder(borderLoc);
+    }
+
+    /// 3. It's touching left and right borders
+    if ((borders & Layouting::Item::LayoutBorderLocation_Verticals) == Layouting::Item::LayoutBorderLocation_Verticals) {
+        // We could measure the distance to the top though.
+        return SideBarLocation::South;
+    }
+
+    /// 4. It's touching top and bottom borders
+    if ((borders & Layouting::Item::LayoutBorderLocation_Horizontals) == Layouting::Item::LayoutBorderLocation_Horizontals) {
+        // We could measure the distance to the left though.
+        return SideBarLocation::East;
+    }
+
+    // 5. It's in a corner
+    if (borders == (Layouting::Item::LayoutBorderLocation_West | Layouting::Item::LayoutBorderLocation_South)) {
+        return aspectRatio > 1.0 ? SideBarLocation::South
+                                 : SideBarLocation::West;
+    } else if (borders == (Layouting::Item::LayoutBorderLocation_East | Layouting::Item::LayoutBorderLocation_South)) {
+        return aspectRatio > 1.0 ? SideBarLocation::South
+                                 : SideBarLocation::East;
+    } else if (borders == (Layouting::Item::LayoutBorderLocation_West | Layouting::Item::LayoutBorderLocation_North)) {
+        return aspectRatio > 1.0 ? SideBarLocation::North
+                                 : SideBarLocation::West;
+    } else if (borders == (Layouting::Item::LayoutBorderLocation_East | Layouting::Item::LayoutBorderLocation_North)) {
+        return aspectRatio > 1.0 ? SideBarLocation::North
+                                 : SideBarLocation::East;
+    }
+
+
+    {
+        // 6. It's only touching 1 border
+        SideBarLocation loc = sideBarLocationForBorder(borders);
+        if (loc != SideBarLocation::None)
+            return loc;
+    }
+
+    // It's not touching any border, use aspect ratio.
+    return aspectRatio > 1.0 ? SideBarLocation::South
+                             : SideBarLocation::West;
+}
+
+void MainWindowBase::Private::updateOverlayGeometry()
+{
+    if (!m_overlayedDockWidget)
+        return;
+
+    SideBar *sb = q->sideBarForDockWidget(m_overlayedDockWidget);
+    if (!sb) {
+        qWarning() << Q_FUNC_INFO << "Expected a sidebar";
+        return;
+    }
+
+    m_overlayedDockWidget->frame()->QWidgetAdapter::setGeometry(rectForOverlay(m_overlayedDockWidget->frame(), sb->location()));
+}
+
+void MainWindowBase::moveToSideBar(DockWidgetBase *dw)
+{
+    moveToSideBar(dw, d->preferredSideBar(dw));
+}
+
+void MainWindowBase::moveToSideBar(DockWidgetBase *dw, SideBarLocation location)
+{
+    if (SideBar *sb = sideBar(location)) {
+        dw->forceClose();
+        sb->addDockWidget(dw);
+    } else {
+        // Shouldn't happen
+        qWarning() << Q_FUNC_INFO << "Minimization supported, probably disabled in Config::self().flags()";
+    }
+}
+
+void MainWindowBase::restoreFromSideBar(DockWidgetBase *dw)
+{
+    // First un-overlay it, if it's overlayed
+    if (dw == d->m_overlayedDockWidget)
+        clearSideBarOverlay();
+
+    SideBar *sb = sideBarForDockWidget(dw);
+    if (!sb) {
+        // Doesn't happen
+        qWarning() << Q_FUNC_INFO << "Dock widget isn't in any sidebar";
+        return;
+    }
+
+    sb->removeDockWidget(dw);
+    dw->setFloating(false); // dock it
+}
+
+void MainWindowBase::overlayOnSideBar(DockWidgetBase *dw)
+{
+    if (!dw)
+        return;
+
+    const SideBar *sb = sideBarForDockWidget(dw);
+    if (sb == nullptr) {
+        qWarning() << Q_FUNC_INFO << "You need to add the dock widget to the sidebar before you can overlay it";
+        return;
+    }
+
+    if (d->m_overlayedDockWidget == dw) {
+        // Already overlayed
+        return;
+    }
+
+    // We only support one overlay at a time, remove any existing overlay
+    clearSideBarOverlay();
+
+    auto frame = Config::self().frameworkWidgetFactory()->createFrame(this, FrameOption_IsOverlayed);
+    d->m_overlayedDockWidget = dw;
+    frame->addWidget(dw);
+    d->updateOverlayGeometry();
+    frame->QWidgetAdapter::show();
+
+    Q_EMIT dw->isOverlayedChanged(true);
+}
+
+void MainWindowBase::toggleOverlayOnSideBar(DockWidgetBase *dw)
+{
+    const bool wasOverlayed = d->m_overlayedDockWidget == dw;
+    clearSideBarOverlay();
+    if (!wasOverlayed) {
+        overlayOnSideBar(dw);
+    }
+}
+
+void MainWindowBase::clearSideBarOverlay()
+{
+    if (!d->m_overlayedDockWidget)
+        return;
+
+    Frame *frame = d->m_overlayedDockWidget->frame();
+    d->m_overlayedDockWidget->setParent(nullptr);
+    Q_EMIT d->m_overlayedDockWidget->isOverlayedChanged(false);
+    d->m_overlayedDockWidget = nullptr;
+    delete frame;
+}
+
+SideBar *MainWindowBase::sideBarForDockWidget(const DockWidgetBase *dw) const
+{
+    for (auto loc : { SideBarLocation::North, SideBarLocation::South,
+                      SideBarLocation::East, SideBarLocation::West }) {
+
+        if (SideBar *sb = sideBar(loc)) {
+            if (sb->contains(const_cast<DockWidgetBase *>(dw)))
+                return sb;
+        }
+    }
+
+    return nullptr;
+}
+
+DockWidgetBase *MainWindowBase::overlayedDockWidget() const
+{
+    return d->m_overlayedDockWidget;
+}
+
+bool MainWindowBase::sideBarIsVisible(SideBarLocation loc) const
+{
+    if (SideBar *sb = sideBar(loc))
+        return sb->isVisible();
+
+    return false;
+}
+
 void MainWindowBase::setUniqueName(const QString &uniqueName)
 {
     if (uniqueName.isEmpty())
@@ -163,6 +460,12 @@ void MainWindowBase::setUniqueName(const QString &uniqueName)
     }
 }
 
+void MainWindowBase::onResized(QResizeEvent *)
+{
+    if (d->m_overlayedDockWidget)
+        d->updateOverlayGeometry();
+}
+
 bool MainWindowBase::deserialize(const LayoutSaver::MainWindow &mw)
 {
     if (mw.options != options()) {

src/MainWindowBase.h

@@ -26,6 +26,7 @@
 #include "LayoutSaver_p.h"
 
 #include <QVector>
+#include <QMargins>
 
 namespace KDDockWidgets {
 
@@ -34,6 +35,7 @@ class Frame;
 class DropArea;
 class MultiSplitter;
 class DropAreaWithCentralFrame;
+class SideBar;
 
 /**
  * @brief The MainWindow base-class. MainWindow and MainWindowBase are only
@@ -52,7 +54,7 @@ class DOCKS_EXPORT MainWindowBase : public QMainWindow
 public:
     typedef QVector<MainWindowBase*> List;
     explicit MainWindowBase(const QString &uniqueName, MainWindowOptions options = MainWindowOption_HasCentralFrame,
-                            QWidgetOrQuick *parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags());
+                            WidgetType *parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags());
 
     ~MainWindowBase() override;
 
@@ -131,8 +133,45 @@ public:
     /// sub-tree.
     void layoutParentContainerEqually(DockWidgetBase *dockWidget);
 
+    ///@brief Moves the dock widget into one of the MainWindow's sidebar.
+    /// Means the dock widget is removed from the layout, and the sidebar shows a button that if pressed
+    /// will toggle the dock widget's visibility as an overlay over the layout. This is the auto-hide
+    /// functionality.
+    ///
+    /// The chosen side bar will depend on some heuristics, mostly proximity.
+    void moveToSideBar(DockWidgetBase *);
+
+    /// @brief overload that allows to specify which sidebar to use, instead of using heuristics.
+    void moveToSideBar(DockWidgetBase *, SideBarLocation);
+
+    /// @brief Removes the dock widget from the sidebar and docks it into the main window again
+    void restoreFromSideBar(DockWidgetBase *);
+
+    ///@brief Shows the dock widget overlayed on top of the main window, placed next to the sidebar
+    void overlayOnSideBar(DockWidgetBase *);
+
+    ///@brief Shows or hides an overlay. It's assumed the dock widget is already in a side-bar.
+    void toggleOverlayOnSideBar(DockWidgetBase *);
+
+    /// @brief closes any overlayed dock widget. The sidebar still displays them as button.
+    void clearSideBarOverlay();
+
+    /// @brief Returns the sidebar this dockwidget is in. nullptr if not in any.
+    SideBar *sideBarForDockWidget(const DockWidgetBase *) const;
+
+    /// @brief returns the dock widget which is currently overlayed. nullptr if none.
+    /// This is only relevant when using the auto-hide and side-bar feature.
+    DockWidgetBase *overlayedDockWidget() const;
+
+    /// @brief Returns whether the specified sidebar is visible
+    bool sideBarIsVisible(SideBarLocation) const;
+
 protected:
     void setUniqueName(const QString &uniqueName);
+    void onResized(QResizeEvent *); // Because QtQuick doesn't have resizeEvent()
+    virtual QMargins centerWidgetMargins() const = 0;
+    virtual SideBar* sideBar(SideBarLocation) const = 0;
+    virtual QRect centralAreaGeometry() const { return {}; }
 
 Q_SIGNALS:
     void uniqueNameChanged();

src/QWidgetAdapter.h

@@ -79,6 +79,8 @@ public:
         , LayoutGuestWidgetBase(this)
     {
     }
+
+  ~LayoutGuestWidget() override;
 };
 }
 

src/fwd_headers/kddockwidgets/private/widgets/SideBarWidget_p.h

@@ -0,0 +1,12 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sergio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#include "../../../../private/widgets/SideBarWidget_p.h"

src/private/DebugWindow.cpp

@@ -200,7 +200,7 @@ DebugWindow::DebugWindow(QWidget *parent)
             mainWindow->multiSplitter()->checkSanity();
         }
 
-        const auto floatingWindows = DockRegistry::self()->nestedwindows();
+        const auto floatingWindows = DockRegistry::self()->floatingWindows();
         for (FloatingWindow *floatingWindow : floatingWindows) {
             floatingWindow->multiSplitter()->checkSanity();
         }
@@ -308,7 +308,7 @@ void DebugWindow::repaintWidgetRecursive(QWidget *w)
 
 void DebugWindow::dumpDockWidgetInfo()
 {
-    const QVector<FloatingWindow*> floatingWindows = DockRegistry::self()->nestedwindows();
+    const QVector<FloatingWindow*> floatingWindows = DockRegistry::self()->floatingWindows();
     const MainWindowBase::List mainWindows = DockRegistry::self()->mainwindows();
     const DockWidgetBase::List dockWidgets = DockRegistry::self()->dockwidgets();
 

src/private/DockRegistry.cpp

@@ -15,6 +15,9 @@
 #include "Position_p.h"
 #include "MultiSplitter_p.h"
 #include "QWidgetAdapter.h"
+#include "Config.h"
+#include "SideBar_p.h"
+#include "WindowBeingDragged_p.h"
 
 #include <QPointer>
 #include <QDebug>
@@ -98,9 +101,13 @@ void DockRegistry::onFocusObjectChanged(QObject *obj)
         Q_EMIT m_focusedDockWidget->isFocusedChanged(true);
 }
 
-bool DockRegistry::isEmpty() const
+bool DockRegistry::isEmpty(bool excludeBeingDeleted) const
 {
-    return m_dockWidgets.isEmpty() && m_mainWindows.isEmpty() && m_nestedWindows.isEmpty();
+    if (!m_dockWidgets.isEmpty() || !m_mainWindows.isEmpty())
+        return false;
+
+    return excludeBeingDeleted ? !hasFloatingWindows()
+                               : m_floatingWindows.isEmpty();
 }
 
 void DockRegistry::checkSanityAll(bool dumpLayout)
@@ -152,6 +159,64 @@ QStringList DockRegistry::dockWidgetNames() const
     return names;
 }
 
+bool DockRegistry::isProbablyObscured(QWindow *window, FloatingWindow *exclude) const
+{
+    if (!window)
+        return false;
+
+    const QRect geo = window->geometry();
+    for (FloatingWindow *fw : m_floatingWindows) {
+        QWindow *fwWindow = fw->QWidgetAdapter::windowHandle();
+        if (fw == exclude || fwWindow == window)
+            continue;
+
+        if (fwWindow->geometry().intersects(geo)) {
+            // fw might be bellow, but we don't have a way to check. So be conservative and return true.
+            return true;
+        }
+    }
+
+    // Floating windows are Tool (keep above), unless we disabled it in Config
+    const bool targetIsToolWindow = !(Config::self().flags() & Config::Flag_DontUseUtilityFloatingWindows) && floatingWindowForHandle(window) != nullptr;
+
+    for (MainWindowBase *mw : m_mainWindows) {
+        QWindow *mwWindow = mw->window()->windowHandle();
+
+        if (mwWindow != window && !targetIsToolWindow && mwWindow->geometry().intersects(geo)) {
+            // Two main windows that intersect. Return true. If the target is a tool window it will be above, so we don't care.
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool DockRegistry::isProbablyObscured(QWindow *target, WindowBeingDragged *exclude) const
+{
+    FloatingWindow *fw = exclude ? exclude->floatingWindow()
+                                 : nullptr; // It's null on Wayland. On wayland obscuring never happens anyway, so not a problem.
+
+    return isProbablyObscured(target, fw);
+}
+
+SideBarLocation DockRegistry::sideBarLocationForDockWidget(const DockWidgetBase *dw) const
+{
+    if (SideBar *sb = sideBarForDockWidget(dw))
+        return sb->location();
+
+    return SideBarLocation::None;
+}
+
+SideBar *DockRegistry::sideBarForDockWidget(const DockWidgetBase *dw) const
+{
+    for (auto mw : m_mainWindows) {
+        if (SideBar *sb = mw->sideBarForDockWidget(dw))
+            return sb;
+    }
+
+    return nullptr;
+}
+
 MainWindowBase::List DockRegistry::mainWindowsWithAffinity(const QStringList &affinities) const
 {
     MainWindowBase::List result;
@@ -170,7 +235,7 @@ MultiSplitter *DockRegistry::layoutForItem(const Layouting::Item *item) const
     if (!item->hostWidget())
         return nullptr;
 
-    if (auto ms = qobject_cast<MultiSplitter*>(item->hostWidget()->asQWidget()))
+    if (auto ms = qobject_cast<MultiSplitter*>(item->hostWidget()->asQObject()))
         return ms;
 
     return nullptr;
@@ -208,6 +273,9 @@ void DockRegistry::registerDockWidget(DockWidgetBase *dock)
 
 void DockRegistry::unregisterDockWidget(DockWidgetBase *dock)
 {
+    if (m_focusedDockWidget == dock)
+        m_focusedDockWidget = nullptr;
+
     m_dockWidgets.removeOne(dock);
     maybeDelete();
 }
@@ -229,14 +297,14 @@ void DockRegistry::unregisterMainWindow(MainWindowBase *mainWindow)
     maybeDelete();
 }
 
-void DockRegistry::registerNestedWindow(FloatingWindow *window)
+void DockRegistry::registerFloatingWindow(FloatingWindow *window)
 {
-    m_nestedWindows << window;
+    m_floatingWindows << window;
 }
 
-void DockRegistry::unregisterNestedWindow(FloatingWindow *window)
+void DockRegistry::unregisterFloatingWindow(FloatingWindow *window)
 {
-    m_nestedWindows.removeOne(window);
+    m_floatingWindows.removeOne(window);
     maybeDelete();
 }
 
@@ -388,12 +456,12 @@ const Frame::List DockRegistry::frames() const
     return m_frames;
 }
 
-const QVector<FloatingWindow *> DockRegistry::nestedwindows() const
+const QVector<FloatingWindow *> DockRegistry::floatingWindows() const
 {
     // Returns all the FloatingWindow which aren't being deleted
     QVector<FloatingWindow *> result;
-    result.reserve(m_nestedWindows.size());
+    result.reserve(m_floatingWindows.size());
-    for (FloatingWindow *fw : m_nestedWindows) {
+    for (FloatingWindow *fw : m_floatingWindows) {
         if (!fw->beingDeleted())
             result.push_back(fw);
     }
@@ -401,11 +469,11 @@ const QVector<FloatingWindow *> DockRegistry::nestedwindows() const
     return result;
 }
 
-const QVector<QWindow *> DockRegistry::floatingWindows() const
+const QVector<QWindow *> DockRegistry::floatingQWindows() const
 {
     QVector<QWindow *> windows;
-    windows.reserve(m_nestedWindows.size());
+    windows.reserve(m_floatingWindows.size());
-    for (FloatingWindow *fw : m_nestedWindows) {
+    for (FloatingWindow *fw : m_floatingWindows) {
         if (!fw->beingDeleted()) {
             if (QWindow *window = fw->windowHandle()) {
                 window->setProperty("kddockwidgets_qwidget", QVariant::fromValue<QWidgetOrQuick*>(fw)); // Since QWidgetWindow is private API
@@ -419,9 +487,16 @@ const QVector<QWindow *> DockRegistry::floatingWindows() const
     return windows;
 }
 
+bool DockRegistry::hasFloatingWindows() const
+{
+    return std::any_of(m_floatingWindows.begin(), m_floatingWindows.end(), [] (FloatingWindow *fw) {
+        return !fw->beingDeleted();
+    });
+}
+
 FloatingWindow *DockRegistry::floatingWindowForHandle(QWindow *windowHandle) const
 {
-    for (FloatingWindow *fw : m_nestedWindows) {
+    for (FloatingWindow *fw : m_floatingWindows) {
         if (fw->windowHandle() == windowHandle)
             return fw;
     }
@@ -432,10 +507,10 @@ FloatingWindow *DockRegistry::floatingWindowForHandle(QWindow *windowHandle) con
 QVector<QWindow *> DockRegistry::topLevels(bool excludeFloatingDocks) const
 {
     QVector<QWindow *> windows;
-    windows.reserve(m_nestedWindows.size() + m_mainWindows.size());
+    windows.reserve(m_floatingWindows.size() + m_mainWindows.size());
 
     if (!excludeFloatingDocks) {
-        for (FloatingWindow *fw : m_nestedWindows) {
+        for (FloatingWindow *fw : m_floatingWindows) {
             if (fw->isVisible()) {
                 if (QWindow *window = fw->windowHandle()) {
                     window->setProperty("kddockwidgets_qwidget", QVariant::fromValue<QWidgetOrQuick*>(fw)); // Since QWidgetWindow is private API
@@ -504,11 +579,39 @@ bool DockRegistry::eventFilter(QObject *watched, QEvent *event)
         if (auto windowHandle = qobject_cast<QWindow*>(watched)) {
             if (FloatingWindow *fw = floatingWindowForHandle(windowHandle)) {
                 // This floating window was exposed
-                m_nestedWindows.removeOne(fw);
+                m_floatingWindows.removeOne(fw);
-                m_nestedWindows.append(fw);
+                m_floatingWindows.append(fw);
             }
         }
+    } else if (event->type() == QEvent::MouseButtonPress) {
+        if (!(Config::self().flags() & Config::Flag_AutoHideSupport))
+            return false;
+
+        auto p = watched;
+        while (p) {
+            if (auto dw = qobject_cast<DockWidgetBase*>(p)) {
+                onDockWidgetPressed(dw);
+                return false;
+            }
+
+            p = p->parent();
+        }
     }
 
     return false;
 }
+
+void DockRegistry::onDockWidgetPressed(DockWidgetBase *dw)
+{
+    // Here we implement "auto-hide". If there's a overlayed dock widget, we hide it if some other
+    // dock widget is clicked.
+
+    MainWindowBase *mainWindow = dw->mainWindow();
+    if (!mainWindow) // Only docked widgets are interesting
+        return;
+
+    DockWidgetBase *overlayedDockWidget = mainWindow->overlayedDockWidget();
+    if (overlayedDockWidget && dw != overlayedDockWidget) {
+        mainWindow->clearSideBarOverlay();
+    }
+}

src/private/DockRegistry_p.h

@@ -28,6 +28,8 @@
 namespace KDDockWidgets
 {
 
+class SideBar;
+
 class DOCKS_EXPORT DockRegistry : public QObject
 {
     Q_OBJECT
@@ -40,8 +42,8 @@ public:
     void registerMainWindow(MainWindowBase *);
     void unregisterMainWindow(MainWindowBase *);
 
-    void registerNestedWindow(FloatingWindow *);
+    void registerFloatingWindow(FloatingWindow *);
-    void unregisterNestedWindow(FloatingWindow *);
+    void unregisterFloatingWindow(FloatingWindow *);
 
     void registerLayout(MultiSplitter *);
     void unregisterLayout(MultiSplitter *);
@@ -82,10 +84,13 @@ public:
 
     ///@brief returns all FloatingWindow instances. Not necessarily all floating dock widgets,
     /// As there might be DockWidgets which weren't morphed yet.
-    const QVector<FloatingWindow*> nestedwindows() const;
+    const QVector<FloatingWindow*> floatingWindows() const;
 
     ///@brief overload that returns list of QWindow. This is more friendly for supporting both QtWidgets and QtQuick
-    const QVector<QWindow*> floatingWindows() const;
+    const QVector<QWindow*> floatingQWindows() const;
+
+    ///@brief returns whether if there's at least one floating window
+    bool hasFloatingWindows() const;
 
     ///@brief returns the FloatingWindow with handle @p windowHandle
     FloatingWindow *floatingWindowForHandle(QWindow *windowHandle) const;
@@ -125,8 +130,10 @@ public:
 
     /**
      * @brief returns true if there's 0 dockwidgets, 0 main windows
+     *
+     * @param excludeBeingDeleted if true, any window currently being deleted won't count
      */
-    bool isEmpty() const;
+    bool isEmpty(bool excludeBeingDeleted = false) const;
 
     /**
      * @brief Calls MultiSplitter::checkSanity() on all layouts.
@@ -165,17 +172,36 @@ public:
     /// @brief Returns a list of all known dock widget unique names
     QStringList dockWidgetNames() const;
 
+    /// @brief returns if the specified window has some other window on top (with higher Z)
+    /// This is an approximation, as we don't have ways to compare Z, so we mostly intersect
+    /// geometries.
+    /// @param target The window which we want to know if it's probably obscured
+    /// @param exclude This window should not be counted as an obscurer. (It's being dragged).
+    bool isProbablyObscured(QWindow *target, FloatingWindow *exclude) const;
+
+    /// @overload
+    bool isProbablyObscured(QWindow *target, WindowBeingDragged *exclude) const;
+
+    ///@brief Returns whether the specified dock widget is in a side bar, and which.
+    /// SideBarLocation::None is returned if it's not in a sidebar.
+    /// This is only relevant when using the auto-hide and side-bar feature.
+    SideBarLocation sideBarLocationForDockWidget(const DockWidgetBase *) const;
+
+    ///@brief Overload that returns the SideBar itself
+    SideBar* sideBarForDockWidget(const DockWidgetBase *) const;
+
 protected:
     bool eventFilter(QObject *watched, QEvent *event) override;
 private:
     explicit DockRegistry(QObject *parent = nullptr);
+    void onDockWidgetPressed(DockWidgetBase *dw);
     void maybeDelete();
     void onFocusObjectChanged(QObject *);
     bool m_isProcessingAppQuitEvent = false;
     DockWidgetBase::List m_dockWidgets;
     MainWindowBase::List m_mainWindows;
     Frame::List m_frames;
-    QVector<FloatingWindow*> m_nestedWindows;
+    QVector<FloatingWindow*> m_floatingWindows;
     QVector<MultiSplitter*> m_layouts;
     QPointer<DockWidgetBase> m_focusedDockWidget;
 };

src/private/DragController.cpp

@@ -89,6 +89,11 @@ StateBase::StateBase(DragController *parent)
 {
 }
 
+bool StateBase::isActiveState() const
+{
+    return q->activeState() == this;
+}
+
 StateBase::~StateBase() = default;
 
 StateNone::StateNone(DragController *parent)
@@ -175,6 +180,27 @@ void StateDragging::onEntry(QEvent *)
 
     q->m_windowBeingDragged = q->m_draggable->makeWindow();
     if (q->m_windowBeingDragged) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+# ifdef Q_OS_WIN
+        if (!q->m_nonClientDrag && KDDockWidgets::usesNativeDraggingAndResizing()) {
+            // Started as a client move, as the dock widget was docked,
+            // but now that we're dragging it as a floating window, switch to native drag
+            FloatingWindow *fw = q->m_windowBeingDragged->floatingWindow();
+            q->m_nonClientDrag = true;
+            q->m_windowBeingDragged.reset();
+            const HWND hwnd = HWND(fw->windowHandle()->winId());
+            q->m_windowBeingDragged = fw->makeWindow();
+
+            QWindow *window = fw->windowHandle();
+            window->startSystemMove();
+
+            // Mouse press was done in another window, so we need to ungrab
+            ReleaseCapture();
+            PostMessage(hwnd, WM_SYSCOMMAND, 0xF012, 0); // SC_DRAGMOVE
+        }
+# endif
+#endif
+
         qCDebug(state) << "StateDragging entered. m_draggable=" << q->m_draggable << "; m_windowBeingDragged=" << q->m_windowBeingDragged->floatingWindow();
 
         auto fw = q->m_windowBeingDragged->floatingWindow();
@@ -212,7 +238,7 @@ bool StateDragging::handleMouseButtonRelease(QPoint globalPos)
     }
 
     if (q->m_currentDropArea) {
-        if (q->m_currentDropArea->drop(floatingWindow, globalPos)) {
+        if (q->m_currentDropArea->drop(q->m_windowBeingDragged.get(), globalPos)) {
             Q_EMIT q->dropped();
         } else {
             qCDebug(state) << "StateDragging: Bailling out, drop not accepted";
@@ -260,7 +286,7 @@ bool StateDragging::handleMouseMove(QPoint globalPos)
             }
         }
 
-        dropArea->hover(fw, globalPos);
+        dropArea->hover(q->m_windowBeingDragged.get(), globalPos);
     }
 
     q->m_currentDropArea = dropArea;
@@ -268,13 +294,39 @@ bool StateDragging::handleMouseMove(QPoint globalPos)
     return true;
 }
 
+StateDraggingWayland::StateDraggingWayland(DragController *parent)
+    : StateDragging(parent)
+{
+}
+
+StateDraggingWayland::~StateDraggingWayland()
+{
+}
+
+void StateDraggingWayland::onEntry(QEvent *)
+{
+    // Create a QDrag here
+}
+
+bool StateDraggingWayland::handleMouseButtonRelease(QPoint /*globalPos*/)
+{
+    Q_EMIT q->dragCanceled();
+    return true;
+}
+
+bool StateDraggingWayland::handleMouseMove(QPoint /*globalPos*/)
+{
+    return true;
+}
+
 DragController::DragController(QObject *)
 {
     qCDebug(creation) << "DragController()";
 
     auto stateNone = new StateNone(this);
     auto statepreDrag = new StatePreDrag(this);
-    auto stateDragging = new StateDragging(this);
+    auto stateDragging = isWayland() ? new StateDraggingWayland(this)
+                                     : new StateDragging(this);
 
     stateNone->addTransition(this, &DragController::mousePressed, statepreDrag);
     statepreDrag->addTransition(this, &DragController::dragCanceled, stateNone);
@@ -337,6 +389,23 @@ void DragController::releaseMouse(QWidgetOrQuick *target)
     }
 }
 
+FloatingWindow *DragController::floatingWindowBeingDragged() const
+{
+    return m_windowBeingDragged ? m_windowBeingDragged->floatingWindow()
+                                : nullptr;
+}
+
+void DragController::enableFallbackMouseGrabber()
+{
+    if (!m_fallbackMouseGrabber)
+        m_fallbackMouseGrabber = new FallbackMouseGrabber(this);
+}
+
+WindowBeingDragged *DragController::windowBeingDragged() const
+{
+    return m_windowBeingDragged.get();
+}
+
 static QMouseEvent *mouseEvent(QEvent *e)
 {
     switch (e->type()) {
@@ -371,7 +440,8 @@ bool DragController::eventFilter(QObject *o, QEvent *e)
     if (!w)
         return QStateMachine::eventFilter(o, e);
 
-    qCDebug(mouseevents) << "DragController::eventFilter e=" << e->type() << "; o=" << o;
+    qCDebug(mouseevents) << "DragController::eventFilter e=" << e->type() << "; o=" << o
+                         << "; m_nonClientDrag=" << m_nonClientDrag;
 
     switch (e->type()) {
     case QEvent::NonClientAreaMouseButtonPress: {
@@ -500,7 +570,7 @@ WidgetType *DragController::qtTopLevelUnderCursor() const
         // The floating window list is sorted by z-order, as we catch QEvent::Expose and move it to last of the list
 
         FloatingWindow *tlwBeingDragged = m_windowBeingDragged->floatingWindow();
-        if (auto tl = qtTopLevelUnderCursor_impl(globalPos, DockRegistry::self()->floatingWindows(), tlwBeingDragged))
+        if (auto tl = qtTopLevelUnderCursor_impl(globalPos, DockRegistry::self()->floatingQWindows(), tlwBeingDragged))
             return tl;
 
         return qtTopLevelUnderCursor_impl<WidgetType*>(globalPos,

src/private/DragController_p.h

@@ -12,6 +12,8 @@
 #ifndef KD_DRAGCONTROLLER_P_H
 #define KD_DRAGCONTROLLER_P_H
 
+#include "docks_export.h"
+
 #include "TitleBar_p.h"
 #include "WindowBeingDragged_p.h"
 
@@ -26,7 +28,7 @@ class DropArea;
 class Draggable;
 class FallbackMouseGrabber;
 
-class DragController : public QStateMachine
+class DOCKS_EXPORT DragController : public QStateMachine
 {
     Q_OBJECT
 public:
@@ -50,6 +52,14 @@ public:
     void grabMouseFor(QWidgetOrQuick *);
     void releaseMouse(QWidgetOrQuick *);
 
+    FloatingWindow *floatingWindowBeingDragged() const;
+
+    ///@brief Returns the window being dragged
+    WindowBeingDragged* windowBeingDragged() const;
+
+    /// Experimental, internal, not for general use.
+    void enableFallbackMouseGrabber();
+
 Q_SIGNALS:
     void mousePressed();
     void manhattanLengthMove();
@@ -94,6 +104,9 @@ public:
     virtual bool handleMouseMove(QPoint /*globalPos*/) { return false; }
     virtual bool handleMouseButtonRelease(QPoint /*globalPos*/) { return false; }
 
+    // Returns whether this is the current state
+    bool isActiveState() const;
+
     DragController *const q;
 };
 
@@ -118,6 +131,7 @@ public:
     bool handleMouseButtonRelease(QPoint) override;
 };
 
+// Used on all platforms except Wayland. @see StateDraggingWayland
 class StateDragging : public StateBase
 {
     Q_OBJECT
@@ -129,6 +143,18 @@ public:
     bool handleMouseMove(QPoint globalPos) override;
 };
 
+// Used on wayland only to use QDrag instead of setting geometry on mouse-move.
+class StateDraggingWayland : public StateDragging
+{
+    Q_OBJECT
+public:
+    explicit StateDraggingWayland(DragController *parent);
+    ~StateDraggingWayland() override;
+    void onEntry(QEvent *) override;
+    bool handleMouseButtonRelease(QPoint globalPos) override;
+    bool handleMouseMove(QPoint globalPos) override;
+};
+
 }
 
 #endif

src/private/DropArea.cpp

@@ -71,6 +71,13 @@ Frame *DropArea::frameContainingPos(QPoint globalPos) const
     return nullptr;
 }
 
+void DropArea::updateFloatingActions()
+{
+    const Frame::List frames = this->frames();
+    for (Frame *frame : frames)
+        frame->updateFloatingActions();
+}
+
 Layouting::Item *DropArea::centralFrame() const
 {
     for (Layouting::Item *item : this->items()) {
@@ -103,6 +110,8 @@ void DropArea::addDockWidget(DockWidgetBase *dw, Location location, DockWidgetBa
 
     dw->saveLastFloatingGeometry();
 
+    const bool hadSingleFloatingFrame = hasSingleFloatingFrame();
+
     // Check if the dock widget already exists in the layout
     if (contains(dw)) {
         Frame *oldFrame = dw->frame();
@@ -124,6 +133,12 @@ void DropArea::addDockWidget(DockWidgetBase *dw, Location location, DockWidgetBa
     } else {
         addWidget(frame, location, relativeToFrame, DefaultSizeMode::Fair, option);
     }
+
+    if (hadSingleFloatingFrame && !hasSingleFloatingFrame()) {
+        // The dock widgets that already existed in our layout need to have their floatAction() updated
+        // otherwise it's still checked. Only the dropped dock widget got updated
+        updateFloatingActions();
+    }
 }
 
 bool DropArea::contains(DockWidgetBase *dw) const
@@ -131,6 +146,12 @@ bool DropArea::contains(DockWidgetBase *dw) const
     return dw->frame() && MultiSplitter::contains(dw->frame());
 }
 
+bool DropArea::hasSingleFloatingFrame() const
+{
+    const Frame::List frames = this->frames();
+    return frames.size() == 1 && frames.first()->isFloating();
+}
+
 QStringList DropArea::affinities() const
 {
     if (auto mw = mainWindow()) {
@@ -153,7 +174,7 @@ void DropArea::layoutParentContainerEqually(DockWidgetBase *dw)
     layoutEqually(item->parentContainer());
 }
 
-void DropArea::hover(FloatingWindow *floatingWindow, QPoint globalPos)
+void DropArea::hover(WindowBeingDragged *floatingWindow, QPoint globalPos)
 {
     if (!validateAffinity(floatingWindow))
         return;
@@ -164,7 +185,7 @@ void DropArea::hover(FloatingWindow *floatingWindow, QPoint globalPos)
     }
 
     Frame *frame = frameContainingPos(globalPos); // Frame is nullptr if MainWindowOption_HasCentralFrame isn't set
-    m_dropIndicatorOverlay->setWindowBeingDragged(floatingWindow);
+    m_dropIndicatorOverlay->setWindowBeingDragged(floatingWindow != nullptr);
     m_dropIndicatorOverlay->setHoveredFrame(frame);
     m_dropIndicatorOverlay->hover(globalPos);
 }
@@ -182,9 +203,12 @@ static bool isOutterLocation(DropIndicatorOverlayInterface::DropLocation locatio
     }
 }
 
-bool DropArea::drop(FloatingWindow *droppedWindow, QPoint globalPos)
+bool DropArea::drop(WindowBeingDragged *droppedWindow, QPoint globalPos)
 {
-    if (droppedWindow == window()) {
+    FloatingWindow *floatingWindow = droppedWindow ? droppedWindow->floatingWindow()
+                                                   : nullptr;
+
+    if (floatingWindow == window()) {
         qWarning() << "Refusing to drop onto itself"; // Doesn't happen
         return false;
     }
@@ -197,15 +221,24 @@ bool DropArea::drop(FloatingWindow *droppedWindow, QPoint globalPos)
     qCDebug(dropping) << "DropArea::drop:" << droppedWindow;
 
     hover(droppedWindow, globalPos);
+    auto droploc = m_dropIndicatorOverlay->currentDropLocation();
     Frame *acceptingFrame = m_dropIndicatorOverlay->hoveredFrame();
     if (!(acceptingFrame || isOutterLocation(m_dropIndicatorOverlay->currentDropLocation()))) {
         qWarning() << "DropArea::drop: asserted with frame=" << acceptingFrame << "; Location=" << m_dropIndicatorOverlay->currentDropLocation();
         return false;
     }
 
-    bool result = true;
+    return drop(floatingWindow, acceptingFrame, droploc);
+}
+
+bool DropArea::drop(FloatingWindow *droppedWindow, Frame *acceptingFrame,
+                    DropIndicatorOverlayInterface::DropLocation droploc)
+{
+    bool result = true;
+    const bool needToFocusNewlyDroppedWidgets = Config::self().flags() & Config::Flag_TitleBarIsFocusable;
+    const DockWidgetBase::List droppedDockWidgets = needToFocusNewlyDroppedWidgets ? droppedWindow->multiSplitter()->dockWidgets()
+                                                                                   : DockWidgetBase::List(); // just so save some memory allocations for the case where this variable isn't used
 
-    auto droploc = m_dropIndicatorOverlay->currentDropLocation();
     switch (droploc) {
     case DropIndicatorOverlayInterface::DropLocation_Left:
     case DropIndicatorOverlayInterface::DropLocation_Top:
@@ -221,7 +254,7 @@ bool DropArea::drop(FloatingWindow *droppedWindow, QPoint globalPos)
         break;
     case DropIndicatorOverlayInterface::DropLocation_Center:
         qCDebug(hovering) << "Tabbing" << droppedWindow << "into" << acceptingFrame;
-        if (!validateAffinity(droppedWindow))
+        if (!validateAffinity(droppedWindow, acceptingFrame))
             return false;
         acceptingFrame->addWidget(droppedWindow);
         break;
@@ -232,9 +265,23 @@ bool DropArea::drop(FloatingWindow *droppedWindow, QPoint globalPos)
         break;
     }
 
-    if (result)
+    if (result) {
+        // Window receiving the drop gets raised:
         raiseAndActivate();
 
+        if (needToFocusNewlyDroppedWidgets) {
+            // Let's also focus the newly dropped dock widget
+            if (droppedDockWidgets.size() > 0) {
+                // If more than 1 was dropped, we only focus the first one
+                Frame *frame = droppedDockWidgets.first()->frame();
+                frame->FocusScope::focus(Qt::MouseFocusReason);
+            } else {
+                // Doesn't happen.
+                qWarning() << Q_FUNC_INFO << "Nothing was dropped?";
+            }
+        }
+    }
+
     return result;
 }
 
@@ -253,7 +300,11 @@ bool DropArea::drop(QWidgetOrQuick *droppedWindow, KDDockWidgets::Location locat
         if (!validateAffinity(floatingWindow))
             return false;
 
+        const bool hadSingleFloatingFrame = hasSingleFloatingFrame();
         addMultiSplitter(floatingWindow->dropArea(), location, relativeTo, DefaultSizeMode::FairButFloor);
+        if (hadSingleFloatingFrame != hasSingleFloatingFrame())
+            updateFloatingActions();
+
         floatingWindow->scheduleDeleteLater();
         return true;
     } else {
@@ -266,19 +317,24 @@ bool DropArea::drop(QWidgetOrQuick *droppedWindow, KDDockWidgets::Location locat
 
 void DropArea::removeHover()
 {
-    m_dropIndicatorOverlay->setWindowBeingDragged(nullptr);
+    m_dropIndicatorOverlay->setWindowBeingDragged(false);
     m_dropIndicatorOverlay->setCurrentDropLocation(DropIndicatorOverlayInterface::DropLocation_None);
 }
 
 template<typename T>
-bool DropArea::validateAffinity(T *window) const
+bool DropArea::validateAffinity(T *window, Frame *acceptingFrame) const
 {
     if (!DockRegistry::self()->affinitiesMatch(window->affinities(), affinities())) {
-        // Commented the warning, so we don't warn when hovering over
-        //qWarning() << Q_FUNC_INFO << "Refusing to dock widget with incompatible affinity."
-                   //<< window->affinityName() << affinityName();
         return false;
     }
 
+    if (acceptingFrame) {
+        // We're dropping into another frame (as tabbed), so also check the affinity of the frame
+        // not only of the main window, which might be more forgiving
+        if (!DockRegistry::self()->affinitiesMatch(window->affinities(), acceptingFrame->affinities())) {
+            return false;
+        }
+    }
+
     return true;
 }

src/private/DropArea_p.h

@@ -25,11 +25,12 @@
 #include "MultiSplitter_p.h"
 #include "DropIndicatorOverlayInterface_p.h"
 
+class TestCommon;
+
 namespace KDDockWidgets {
 
 class Frame;
 class Draggable;
-class DropIndicatorOverlayInterface;
 struct WindowBeingDragged;
 
 /**
@@ -43,9 +44,9 @@ public:
     ~DropArea();
 
     void removeHover();
-    void hover(FloatingWindow *floatingWindow, QPoint globalPos);
+    void hover(WindowBeingDragged *floatingWindow, QPoint globalPos);
-    bool drop(FloatingWindow *droppedWindow, QPoint globalPos);
+    ///@brief Called when a user drops a widget via DND
-    bool drop(QWidgetOrQuick *droppedwindow, KDDockWidgets::Location location, Frame *relativeTo);
+    bool drop(WindowBeingDragged *droppedWindow, QPoint globalPos);
     int numFrames() const;
     Frame::List frames() const;
 
@@ -55,17 +56,28 @@ public:
 
     bool contains(DockWidgetBase *) const;
 
+    /// Returns whether this layout has a single dock widget which is floating
+    /// Implies it's in a FloatingWindow and that it has only one dock widget
+    bool hasSingleFloatingFrame() const;
+
     QStringList affinities() const;
     void layoutParentContainerEqually(DockWidgetBase *);
 private:
     Q_DISABLE_COPY(DropArea)
     friend class Frame;
     friend class TestDocks;
+    friend class ::TestCommon;
     friend class DropIndicatorOverlayInterface;
     friend class AnimatedIndicators;
+    friend class FloatingWindow;
+
     template <typename T>
-    bool validateAffinity(T *) const;
+    bool validateAffinity(T *, Frame *acceptingFrame = nullptr) const;
+    bool drop(FloatingWindow *droppedWindow, Frame *acceptingFrame, DropIndicatorOverlayInterface::DropLocation);
+    bool drop(QWidgetOrQuick *droppedwindow, KDDockWidgets::Location location, Frame *relativeTo);
     Frame *frameContainingPos(QPoint globalPos) const;
+    void updateFloatingActions();
+
     bool m_inDestructor = false;
     QString m_affinityName;
     DropIndicatorOverlayInterface *m_dropIndicatorOverlay = nullptr;

src/private/DropIndicatorOverlayInterface.cpp

@@ -13,7 +13,6 @@
 
 #include "Frame_p.h"
 #include "DropArea_p.h"
-#include "FloatingWindow_p.h"
 
 using namespace KDDockWidgets;
 
@@ -25,20 +24,20 @@ DropIndicatorOverlayInterface::DropIndicatorOverlayInterface(DropArea *dropArea)
     setObjectName(QStringLiteral("DropIndicatorOverlayInterface"));
 }
 
-void DropIndicatorOverlayInterface::setWindowBeingDragged(const FloatingWindow *window)
+void DropIndicatorOverlayInterface::setWindowBeingDragged(bool is)
 {
-    if (window == m_windowBeingDragged)
+    if (is == m_draggedWindowIsHovering)
         return;
 
-    m_windowBeingDragged = window;
+    m_draggedWindowIsHovering = is;
-    if (m_windowBeingDragged) {
+    if (is) {
         setGeometry(m_dropArea->QWidgetAdapter::rect());
         raise();
     } else {
         setHoveredFrame(nullptr);
     }
 
-    setVisible(m_windowBeingDragged != nullptr);
+    setVisible(is);
     updateVisibility();
 }
 
@@ -70,7 +69,7 @@ void DropIndicatorOverlayInterface::setHoveredFrame(Frame *frame)
 
 bool DropIndicatorOverlayInterface::isHovered() const
 {
-    return m_windowBeingDragged != nullptr;
+    return m_draggedWindowIsHovering;
 }
 
 DropIndicatorOverlayInterface::DropLocation DropIndicatorOverlayInterface::currentDropLocation() const

src/private/DropIndicatorOverlayInterface_p.h

@@ -19,7 +19,6 @@
 
 namespace KDDockWidgets {
 
-class FloatingWindow;
 class DropArea;
 
 class DOCKS_EXPORT DropIndicatorOverlayInterface : public QWidgetAdapter
@@ -47,7 +46,7 @@ public:
 
     explicit DropIndicatorOverlayInterface(DropArea *dropArea);
     void setHoveredFrame(Frame *);
-    void setWindowBeingDragged(const FloatingWindow *);
+    void setWindowBeingDragged(bool);
     QRect hoveredFrameRect() const;
     bool isHovered() const;
     DropLocation currentDropLocation() const;
@@ -77,8 +76,8 @@ protected:
     virtual void updateVisibility() {};
 
     Frame *m_hoveredFrame = nullptr;
-    QPointer<const FloatingWindow> m_windowBeingDragged;
     DropArea *const m_dropArea;
+    bool m_draggedWindowIsHovering = false;
 };
 }
 

src/private/FloatingWindow.cpp

@@ -25,9 +25,11 @@
 #include <QCloseEvent>
 #include <QAbstractNativeEventFilter>
 #include <QWindow>
+#include <QScopedValueRollback>
 
-#if defined(Q_OS_WIN) && defined(KDDOCKWIDGETS_QTWIDGETS)
+#if defined(Q_OS_WIN)
 # include <Windows.h>
+# include <dwmapi.h>
 #endif
 
 using namespace KDDockWidgets;
@@ -73,41 +75,23 @@ public:
 }
 #endif
 
-FloatingWindow::FloatingWindow(MainWindowBase *parent)
+static Qt::WindowFlags windowFlagsToUse()
-    : QWidgetAdapter(parent, KDDockWidgets::usesNativeDraggingAndResizing() ? Qt::Window : Qt::Tool)
-    , Draggable(this, KDDockWidgets::usesNativeDraggingAndResizing()) // FloatingWindow is only draggable when using a native title bar. Otherwise the KDDockWidgets::TitleBar is the draggable
-    , m_dropArea(new DropArea(this))
-    , m_titleBar(Config::self().frameworkWidgetFactory()->createTitleBar(this))
 {
-#if defined(Q_OS_WIN) && defined(KDDOCKWIDGETS_QTWIDGETS)
+    if (KDDockWidgets::usesNativeDraggingAndResizing())
-    if (KDDockWidgets::usesAeroSnapWithCustomDecos()) {
+        return Qt::Window;
-        m_nchittestFilter = new NCHITTESTEventFilter(this);
-        qApp->installNativeEventFilter(m_nchittestFilter);
-    }
-#endif
 
-    DockRegistry::self()->registerNestedWindow(this);
+    if (Config::self().flags() & Config::Flag_internal_DontUseQtToolWindowsForFloatingWindows)
-    qCDebug(creation) << "FloatingWindow()" << this;
+        return Qt::Window;
 
-#if defined(Q_OS_WIN) && defined(KDDOCKWIDGETS_QTWIDGETS)
+    return Qt::Tool;
-# if QT_VERSION < 0x051000
-    // On Windows with Qt 5.9 (and maybe later but we don't care), the WM_NCALCSIZE isn't being processed unless we explicitly create the window.
-    // So create it now, otherwise floating dock widgets will show a native title bar until resized.
-    create();
-# endif
-#endif
-
-    maybeCreateResizeHandler();
-
-    updateTitleBarVisibility();
-    connect(m_dropArea, &MultiSplitter::visibleWidgetCountChanged, this, &FloatingWindow::onFrameCountChanged);
-    connect(m_dropArea, &MultiSplitter::visibleWidgetCountChanged, this, &FloatingWindow::numFramesChanged);
-    connect(m_dropArea, &MultiSplitter::visibleWidgetCountChanged, this, &FloatingWindow::onVisibleFrameCountChanged);
-    m_layoutDestroyedConnection = connect(m_dropArea, &QObject::destroyed, this, &FloatingWindow::scheduleDeleteLater);
 }
 
 static MainWindowBase* hackFindParentHarder(Frame *frame, MainWindowBase *candidateParent)
 {
+    if (Config::self().flags() & Config::Flag_internal_DontUseParentForFloatingWindows) {
+        return nullptr;
+    }
+
     // TODO: Using a parent helps the floating windows stay in front of the main window always.
     // We're not receiving the parent via ctor argument as the app can have multiple-main windows,
     // so use a hack here.
@@ -136,6 +120,53 @@ static MainWindowBase* hackFindParentHarder(Frame *frame, MainWindowBase *candid
     }
 }
 
+MainWindowBase *actualParent(MainWindowBase *candidate)
+{
+    return (Config::self().flags() & Config::Flag_internal_DontUseParentForFloatingWindows)
+            ? nullptr
+            : candidate;
+}
+
+FloatingWindow::FloatingWindow(MainWindowBase *parent)
+    : QWidgetAdapter(actualParent(parent), windowFlagsToUse())
+    , Draggable(this, KDDockWidgets::usesNativeDraggingAndResizing()) // FloatingWindow is only draggable when using a native title bar. Otherwise the KDDockWidgets::TitleBar is the draggable
+    , m_dropArea(new DropArea(this))
+    , m_titleBar(Config::self().frameworkWidgetFactory()->createTitleBar(this))
+{
+#if defined(Q_OS_WIN) && defined(KDDOCKWIDGETS_QTWIDGETS)
+    // On Windows with Qt 5.9 (and maybe earlier), the WM_NCALCSIZE isn't being processed unless we explicitly create the window.
+    // So create it now, otherwise floating dock widgets will show a native title bar until resized.
+    create();
+
+    if (KDDockWidgets::usesAeroSnapWithCustomDecos()) {
+        m_nchittestFilter = new NCHITTESTEventFilter(this);
+        qApp->installNativeEventFilter(m_nchittestFilter);
+
+        connect(windowHandle(), &QWindow::screenChanged, this, [this] {
+            // Qt honors our frame hijacking usually... but when screen changes we must give it a nudge.
+            // Otherwise what Qt thinks is the client area is not what Windows knows it is.
+            // SetWindowPos() will trigger an NCCALCSIZE message, which Qt will intercept and take note of the margins we're using.
+            SetWindowPos(HWND(winId()), 0, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);
+        });
+
+        // Show drop-shadow:
+        MARGINS margins = {0, 0, 0, 1}; // arbitrary, just needs to be > 0 it seems
+        DwmExtendFrameIntoClientArea(HWND(winId()), &margins);
+    }
+#endif
+
+    DockRegistry::self()->registerFloatingWindow(this);
+    qCDebug(creation) << "FloatingWindow()" << this;
+
+    maybeCreateResizeHandler();
+
+    updateTitleBarVisibility();
+    connect(m_dropArea, &MultiSplitter::visibleWidgetCountChanged, this, &FloatingWindow::onFrameCountChanged);
+    connect(m_dropArea, &MultiSplitter::visibleWidgetCountChanged, this, &FloatingWindow::numFramesChanged);
+    connect(m_dropArea, &MultiSplitter::visibleWidgetCountChanged, this, &FloatingWindow::onVisibleFrameCountChanged);
+    m_layoutDestroyedConnection = connect(m_dropArea, &QObject::destroyed, this, &FloatingWindow::scheduleDeleteLater);
+}
+
 FloatingWindow::FloatingWindow(Frame *frame, MainWindowBase *parent)
     : FloatingWindow(hackFindParentHarder(frame, parent))
 {
@@ -153,7 +184,7 @@ FloatingWindow::~FloatingWindow()
     disconnect(m_layoutDestroyedConnection);
     delete m_nchittestFilter;
 
-    DockRegistry::self()->unregisterNestedWindow(this);
+    DockRegistry::self()->unregisterFloatingWindow(this);
     qCDebug(creation) << "~FloatingWindow";
 }
 
@@ -228,7 +259,7 @@ void FloatingWindow::setSuggestedGeometry(QRect suggestedRect, bool preserveCent
 void FloatingWindow::scheduleDeleteLater()
 {
     m_deleteScheduled = true;
-    DockRegistry::self()->unregisterNestedWindow(this);
+    DockRegistry::self()->unregisterFloatingWindow(this);
     deleteLater();
 }
 
@@ -239,7 +270,7 @@ MultiSplitter *FloatingWindow::multiSplitter() const
 
 bool FloatingWindow::isInDragArea(QPoint globalPoint) const
 {
-    return dragRect().adjusted(8, 8, 0, 0).contains(globalPoint);
+    return dragRect().contains(globalPoint);
 }
 
 bool FloatingWindow::anyNonClosable() const
@@ -296,6 +327,8 @@ void FloatingWindow::onFrameCountChanged(int count)
         scheduleDeleteLater();
     } else {
         updateTitleBarVisibility();
+        if (count == 1) // if something was removed, then our single dock widget is floating, we need to check the QAction
+            dropArea()->updateFloatingActions();
     }
 }
 
@@ -309,13 +342,15 @@ void FloatingWindow::onVisibleFrameCountChanged(int count)
 
 void FloatingWindow::updateTitleBarVisibility()
 {
+    if (m_updatingTitleBarVisibility)
+        return; // Break recursion
+
+    QScopedValueRollback<bool> guard(m_updatingTitleBarVisibility, true);
     updateTitleAndIcon();
 
     bool visible = true;
 
-    if (KDDockWidgets::usesNativeTitleBar()) {
+    if (KDDockWidgets::usesClientTitleBar()) {
-        visible = false;
-    } else {
         const auto flags = Config::self().flags();
         if ((flags & Config::Flag_HideTitleBarWhenTabsVisible) && !(flags & Config::Flag_AlwaysTitleBarWhenFloating)) {
             if (hasSingleFrame()) {
@@ -325,6 +360,8 @@ void FloatingWindow::updateTitleBarVisibility()
 
         for (Frame *frame : frames())
             frame->updateTitleBarVisibility();
+    } else {
+        visible = false;
     }
 
     m_titleBar->setVisible(visible);

src/private/FloatingWindow_p.h

@@ -145,6 +145,7 @@ private:
     bool m_disableSetVisible = false;
     bool m_deleteScheduled = false;
     bool m_inDtor = false;
+    bool m_updatingTitleBarVisibility = false;
     QMetaObject::Connection m_layoutDestroyedConnection;
     QAbstractNativeEventFilter *m_nchittestFilter = nullptr;
 };

src/private/Frame.cpp

@@ -57,6 +57,7 @@ Frame::Frame(QWidgetOrQuick *parent, FrameOptions options)
     qCDebug(creation) << "Frame" << ((void*)this) << s_dbg_numFrames;
 
     connect(this, &Frame::currentDockWidgetChanged, this, &Frame::updateTitleAndIcon);
+    setDropArea(qobject_cast<DropArea *>(QWidgetAdapter::parentWidget()));
     m_inCtor = false;
 }
 
@@ -93,6 +94,16 @@ void Frame::updateTitleAndIcon()
     }
 }
 
+void Frame::onDockWidgetTitleChanged()
+{
+    updateTitleAndIcon();
+
+    if (!m_inCtor) { // don't call pure virtual in ctor
+        if (auto dw = qobject_cast<DockWidgetBase*>(sender()))
+            renameTab(indexOfDockWidget(dw), dw->title());
+    }
+}
+
 void Frame::addWidget(DockWidgetBase *dockWidget, AddingOption addingOption)
 {
     insertWidget(dockWidget, dockWidgetCount(), addingOption); // append
@@ -149,14 +160,14 @@ void Frame::insertWidget(DockWidgetBase *dockWidget, int index, AddingOption add
         }
     }
 
-    connect(dockWidget, &DockWidgetBase::titleChanged, this, &Frame::updateTitleAndIcon);
+    connect(dockWidget, &DockWidgetBase::titleChanged, this, &Frame::onDockWidgetTitleChanged);
-    connect(dockWidget, &DockWidgetBase::iconChanged, this, &Frame::updateTitleAndIcon);
+    connect(dockWidget, &DockWidgetBase::iconChanged, this, &Frame::onDockWidgetTitleChanged);
 }
 
 void Frame::removeWidget(DockWidgetBase *dw)
 {
-    disconnect(dw, &DockWidgetBase::titleChanged, this, &Frame::updateTitleAndIcon);
+    disconnect(dw, &DockWidgetBase::titleChanged, this, &Frame::onDockWidgetTitleChanged);
-    disconnect(dw, &DockWidgetBase::iconChanged, this, &Frame::updateTitleAndIcon);
+    disconnect(dw, &DockWidgetBase::iconChanged, this, &Frame::onDockWidgetTitleChanged);
     removeWidget_impl(dw);
 }
 
@@ -283,6 +294,13 @@ void Frame::updateTitleBarVisibility()
     }
 }
 
+void Frame::updateFloatingActions()
+{
+    const QVector<DockWidgetBase *> widgets = dockWidgets();
+    for (DockWidgetBase *dw : widgets)
+        dw->updateFloatAction();
+}
+
 bool Frame::containsMouse(QPoint globalPos) const
 {
     return QWidgetAdapter::rect().contains(KDDockWidgets::QWidgetAdapter::mapFromGlobal(globalPos));
@@ -500,7 +518,10 @@ QStringList Frame::affinities() const
 
 void Frame::setDropArea(DropArea *dt)
 {
-    if (dt != m_dropArea) {
+    if (dt == m_dropArea)
+        return;
+
+
     qCDebug(docking) << "Frame::setDropArea dt=" << dt;
     const bool wasInMainWindow = dt && isInMainWindow();
     if (m_dropArea)
@@ -516,7 +537,7 @@ void Frame::setDropArea(DropArea *dt)
         if (wasInMainWindow != isInMainWindow())
             Q_EMIT isInMainWindowChanged();
     }
-    }
+
 }
 
 bool Frame::isTheOnlyFrame() const
@@ -526,6 +547,11 @@ bool Frame::isTheOnlyFrame() const
     return m_dropArea && m_dropArea->numFrames() == 1;
 }
 
+bool Frame::isOverlayed() const
+{
+    return m_options & FrameOption_IsOverlayed;
+}
+
 bool Frame::isFloating() const
 {
     if (isInMainWindow())
@@ -541,7 +567,7 @@ bool Frame::isInFloatingWindow() const
 
 bool Frame::isInMainWindow() const
 {
-    return m_dropArea && m_dropArea->isInMainWindow();
+    return mainWindow() != nullptr;
 }
 
 bool Frame::event(QEvent *e)
@@ -650,3 +676,14 @@ QRect Frame::dragRect() const
 
     return rect;
 }
+
+DropArea *Frame::dropArea() const
+{
+    return m_dropArea;
+}
+
+MainWindowBase *Frame::mainWindow() const
+{
+    return m_dropArea ? m_dropArea->mainWindow()
+                      : nullptr;
+}

src/private/Frame_p.h

@@ -37,6 +37,7 @@ class TitleBar;
 class DropArea;
 class DockWidgetBase;
 class FloatingWindow;
+class MainWindowBase;
 
 /**
  * @brief A DockWidget wrapper that adds a QTabWidget and a TitleBar
@@ -104,17 +105,26 @@ public:
     int dockWidgetCount() const;
 
     void updateTitleAndIcon();
+    void onDockWidgetTitleChanged();
     void updateTitleBarVisibility();
+    void updateFloatingActions();
     bool containsMouse(QPoint globalPos) const;
     TitleBar *titleBar() const;
     TitleBar *actualTitleBar() const;
     QString title() const;
     QIcon icon() const;
     const QVector<DockWidgetBase *> dockWidgets() const;
+
     void setDropArea(DropArea *);
 
+    ///@brief Returns the drop area this Frame is in.
+    DropArea *dropArea() const;
+
     bool isTheOnlyFrame() const;
 
+    ///@brief Returns whether this frame is overlayed on top of the MainWindow (auto-hide feature);
+    bool isOverlayed() const;
+
     /**
      * @brief Returns whether this frame is floating. A floating frame isn't attached to any other MainWindow,
      * and if it's attached to a FloatingWindow then it's considered floating if it's the only frame in that Window.
@@ -154,14 +164,18 @@ public:
      */
     bool alwaysShowsTabs() const { return m_options & FrameOption_AlwaysShowsTabs; }
 
-
     /// @brief returns whether the dockwidget @p w is inside this frame
     bool contains(DockWidgetBase *w) const;
 
-
     ///@brief returns the FloatingWindow this frame is in, if any
     FloatingWindow *floatingWindow() const;
 
+    /**
+     * @brief Returns the main window this frame is in.
+     * nullptr if not inside a main window.
+     */
+    MainWindowBase *mainWindow() const;
+
     /**
      * @brief Puts the Frame back in its previous main window position
      *
@@ -230,6 +244,8 @@ Q_SIGNALS:
     void focusedWidgetChanged() override;
 protected:
 
+    virtual void renameTab(int index, const QString &) = 0;
+
     /**
      * @brief Returns the minimum size of the dock widgets.
      * This might be slightly smaller than Frame::minSize() due to the QTabWidget having some margins

src/private/MultiSplitter.cpp

@@ -31,6 +31,7 @@
 #include "FrameworkWidgetFactory.h"
 #include "multisplitter/Widget_qwidget.h"
 #include "DropArea_p.h"
+#include "WindowBeingDragged_p.h"
 
 #include <QScopedValueRollback>
 
@@ -92,6 +93,9 @@ MainWindowBase *MultiSplitter::mainWindow() const
         // Note that if pw is a FloatingWindow then pw->parentWidget() can be a MainWindow too, as it's parented
         if (pw->objectName() == QLatin1String("MyCentralWidget"))
             return qobject_cast<MainWindowBase*>(pw->parentWidget());
+
+        if (auto mw = qobject_cast<MainWindowBase*>(pw))
+            return mw;
     }
 
     return nullptr;
@@ -200,7 +204,17 @@ void MultiSplitter::addWidget(QWidgetOrQuick *w, Location location,
     } else if (auto ms = qobject_cast<MultiSplitter*>(w)) {
         newItem = ms->rootItem();
         newItem->setHostWidget(this);
+
+        if (FloatingWindow *fw = ms->floatingWindow()) {
+            newItem->setSize_recursive(fw->size());
+        }
+
         delete ms;
+    } else {
+        // This doesn't happen but let's make coverity happy.
+        // Tests will fail if this is ever printed.
+        qWarning() << Q_FUNC_INFO << "Unknown widget added" << w;
+        return;
     }
 
     Q_ASSERT(!newItem->geometry().isEmpty());
@@ -288,6 +302,16 @@ Layouting::Item *MultiSplitter::itemForFrame(const Frame *frame) const
     return m_rootItem->itemForWidget(frame);
 }
 
+DockWidgetBase::List MultiSplitter::dockWidgets() const
+{
+    DockWidgetBase::List dockWidgets;
+    const Frame::List frames = this->frames();
+    for (Frame *frame : frames)
+        dockWidgets << frame->dockWidgets();
+
+    return dockWidgets;
+}
+
 Frame::List MultiSplitter::framesFrom(QWidgetOrQuick *frameOrMultiSplitter) const
 {
     if (auto frame = qobject_cast<Frame*>(frameOrMultiSplitter))
@@ -413,17 +437,16 @@ Layouting::ItemContainer *MultiSplitter::rootItem() const
     return m_rootItem;
 }
 
-QRect MultiSplitter::rectForDrop(const FloatingWindow *fw, Location location,
+QRect MultiSplitter::rectForDrop(const WindowBeingDragged *wbd, Location location,
                                  const Layouting::Item *relativeTo) const
 {
     Layouting::Item item(nullptr);
-    if (!fw)
+    if (!wbd)
         return {};
 
-    Layouting::ItemContainer *root = fw->dropArea()->rootItem();
+    item.setSize(wbd->size().boundedTo(wbd->maxSize()));
-    item.setSize(root->size());
+    item.setMinSize(wbd->minSize());
-    item.setMinSize(root->minSize());
+    item.setMaxSizeHint(wbd->maxSize());
-    item.setMaxSizeHint(root->maxSizeHint());
 
     Layouting::ItemContainer *container = relativeTo ? relativeTo->parentContainer()
                                                      : m_rootItem;

src/private/MultiSplitter_p.h

@@ -40,7 +40,7 @@ namespace KDDockWidgets {
 class MainWindowBase;
 class FloatingWindow;
 class Frame;
-
+class WindowBeingDragged;
 
 /**
  * MultiSplitter is simply a wrapper around Layouting::Item in which the hosted widgets are
@@ -53,7 +53,7 @@ class Frame;
  * It supports adding a widget to the left/top/bottom/right of the whole MultiSplitter or adding
  * relative to a single widget.
  */
-class DOCKS_EXPORT_FOR_UNIT_TESTS MultiSplitter
+class DOCKS_EXPORT MultiSplitter
         : public LayoutGuestWidget
 {
     Q_OBJECT
@@ -131,7 +131,7 @@ public:
      * Excludes the Separator thickness, result is actually smaller than what needed. In other words,
      * the result will be exactly the same as the geometry the widget will get.
      */
-    QRect rectForDrop(const FloatingWindow *, KDDockWidgets::Location location,
+    QRect rectForDrop(const WindowBeingDragged *wbd, KDDockWidgets::Location location,
                       const Layouting::Item *relativeTo) const;
 
     bool deserialize(const LayoutSaver::MultiSplitter &);
@@ -188,10 +188,13 @@ public:
     Layouting::Item *itemForFrame(const Frame *frame) const;
 
     /**
-     * @brief Returns a list of Frame objects contained in this layout
+     * @brief Returns this list of Frame objects contained in this layout
      */
     QList<Frame*> frames() const;
 
+    /// @brief Returns the list of dock widgets contained in this layout
+    QVector<DockWidgetBase*> dockWidgets() const;
+
     /// @brief restores the dockwidget @p dw to its previous position
     void restorePlaceholder(DockWidgetBase *dw, Layouting::Item *, int tabIndex);
 

src/private/Position.cpp

@@ -125,7 +125,7 @@ void Position::deserialize(const LayoutSaver::Position &lp)
             if (index == -1) {
                 continue; // Skip
             } else {
-                const auto floatingWindows = DockRegistry::self()->nestedwindows();
+                const auto floatingWindows = DockRegistry::self()->floatingWindows();
                 if (index >= 0 && index < floatingWindows.size()) {
                     FloatingWindow *fw = floatingWindows.at(index);
                     layout = fw->multiSplitter();
@@ -170,7 +170,7 @@ LayoutSaver::Position Position::serialize() const
         p.isFloatingWindow = fw;
 
         if (p.isFloatingWindow) {
-            p.indexOfFloatingWindow = fw->beingDeleted() ? -1 : DockRegistry::self()->nestedwindows().indexOf(fw); // TODO: Remove once we stop using deleteLater with FloatingWindow. delete would be better
+            p.indexOfFloatingWindow = fw->beingDeleted() ? -1 : DockRegistry::self()->floatingWindows().indexOf(fw); // TODO: Remove once we stop using deleteLater with FloatingWindow. delete would be better
         } else {
             p.mainWindowUniqueName = mainWindow->uniqueName();
             Q_ASSERT(!p.mainWindowUniqueName.isEmpty());

src/private/SideBar.cpp

@@ -0,0 +1,109 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2019-2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#include "SideBar_p.h"
+#include "DockWidgetBase.h"
+#include "MainWindowBase.h"
+
+#include <QDebug>
+
+using namespace KDDockWidgets;
+
+SideBar::SideBar(SideBarLocation location, MainWindowBase *parent)
+    : QWidgetAdapter(parent)
+    , m_mainWindow(parent)
+    , m_location(location)
+    , m_orientation((location == SideBarLocation::North || location == SideBarLocation::South) ? Qt::Horizontal
+                                                                                               : Qt::Vertical)
+{
+    updateSize();
+}
+
+void SideBar::addDockWidget(DockWidgetBase *dw)
+{
+    if (!dw)
+        return;
+
+    if (m_dockWidgets.contains(dw)) {
+        qWarning() << Q_FUNC_INFO << "Already contains dock widget" << dw->title();
+        return;
+    }
+
+    connect(dw, &QObject::destroyed, this, &SideBar::onDockWidgetDestroyed);
+
+    m_dockWidgets << dw;
+    addDockWidget_Impl(dw);
+    updateSize();
+}
+
+void SideBar::removeDockWidget(DockWidgetBase *dw)
+{
+    if (!m_dockWidgets.contains(dw)) {
+        qWarning() << Q_FUNC_INFO << "Doesn't contain dock widget" << dw->title();
+        return;
+    }
+
+    disconnect(dw, &QObject::destroyed, this, &SideBar::onDockWidgetDestroyed);
+    m_dockWidgets.removeOne(dw);
+    removeDockWidget_Impl(dw);
+    Q_EMIT dw->removedFromSideBar();
+    updateSize();
+}
+
+bool SideBar::contains(DockWidgetBase *dw) const
+{
+    return m_dockWidgets.contains(dw);
+}
+
+void SideBar::onButtonClicked(DockWidgetBase *dw)
+{
+    toggleOverlay(dw);
+}
+
+void SideBar::onDockWidgetDestroyed(QObject *dw)
+{
+    removeDockWidget(static_cast<DockWidgetBase*>(dw));
+}
+
+void SideBar::updateSize()
+{
+    const int thickness = isEmpty() ? 0 : 30;
+    if (isVertical()) {
+        setFixedWidth(thickness);
+    } else {
+        setFixedHeight(thickness);
+    }
+}
+
+Qt::Orientation SideBar::orientation() const
+{
+    return m_orientation;
+}
+
+bool SideBar::isEmpty() const
+{
+    return m_dockWidgets.isEmpty();
+}
+
+SideBarLocation SideBar::location() const
+{
+    return m_location;
+}
+
+MainWindowBase *SideBar::mainWindow() const
+{
+    return m_mainWindow;
+}
+
+void SideBar::toggleOverlay(DockWidgetBase *dw)
+{
+    m_mainWindow->toggleOverlayOnSideBar(dw);
+}

src/private/SideBar_p.h

@@ -0,0 +1,70 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2019-2020 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#ifndef KD_SIDEBAR_P_H
+#define KD_SIDEBAR_P_H
+
+#include "docks_export.h"
+#include "KDDockWidgets.h"
+#include "QWidgetAdapter.h"
+
+namespace KDDockWidgets {
+
+class DockWidgetBase;
+class MainWindowBase;
+
+class DOCKS_EXPORT SideBar : public QWidgetAdapter
+{
+    Q_OBJECT
+public:
+    explicit SideBar(SideBarLocation, MainWindowBase *parent = nullptr);
+
+    void addDockWidget(DockWidgetBase *dw);
+    void removeDockWidget(DockWidgetBase *dw);
+    bool contains(DockWidgetBase *) const;
+
+    /// @brief Returns this side bar's orientation
+    Qt::Orientation orientation() const;
+
+    /// @brief returns if this side bar has vertical orientation
+    bool isVertical() const { return m_orientation == Qt::Vertical; }
+
+    /// @brief returns whether there's no dock widgets
+    bool isEmpty() const;
+
+    /// @brief returns the sidebar's location in the main window
+    SideBarLocation location() const;
+
+    /// @brief Returns the main window this side bar belongs to
+    MainWindowBase *mainWindow() const;
+
+    /// @brief Toggles the dock widget overlay. Equivalent to the user clicking on the button.
+    void toggleOverlay(DockWidgetBase *);
+
+protected:
+    virtual void addDockWidget_Impl(DockWidgetBase *dock) = 0;
+    virtual void removeDockWidget_Impl(DockWidgetBase *dock) = 0;
+
+    void onButtonClicked(DockWidgetBase *dw);
+
+private:
+    void onDockWidgetDestroyed(QObject *dw);
+    void updateSize();
+
+    MainWindowBase *const m_mainWindow;
+    QVector<DockWidgetBase *> m_dockWidgets;
+    const SideBarLocation m_location;
+    const Qt::Orientation m_orientation;
+};
+
+}
+
+#endif

src/private/TitleBar.cpp

@@ -16,7 +16,10 @@
 #include "WindowBeingDragged_p.h"
 #include "Utils_p.h"
 #include "FrameworkWidgetFactory.h"
+#include "Config.h"
+#include "MainWindowBase.h"
 
+#include <QTimer>
 #include <QWindowStateChangeEvent>
 
 using namespace KDDockWidgets;
@@ -26,14 +29,19 @@ TitleBar::TitleBar(Frame *parent)
     , Draggable(this)
     , m_frame(parent)
     , m_floatingWindow(nullptr)
+    , m_supportsAutoHide(Config::self().flags() & Config::Flag_AutoHideSupport)
 {
     connect(m_frame, &Frame::numDockWidgetsChanged, this, &TitleBar::updateCloseButton);
     connect(m_frame, &Frame::isFocusedChanged, this, &TitleBar::isFocusedChanged);
+    connect(m_frame, &Frame::isInMainWindowChanged, this, &TitleBar::updateAutoHideButton);
 
     init();
 
     if (Config::self().flags() & Config::Flag_TitleBarIsFocusable)
         setFocusPolicy(Qt::StrongFocus);
+
+    QTimer::singleShot(0, this, &TitleBar::updateAutoHideButton); // have to wait after the frame is constructed
+    updateAutoHideButton();
 }
 
 TitleBar::TitleBar(FloatingWindow *parent)
@@ -41,13 +49,16 @@ TitleBar::TitleBar(FloatingWindow *parent)
     , Draggable(this)
     , m_frame(nullptr)
     , m_floatingWindow(parent)
+    , m_supportsAutoHide(Config::self().flags() & Config::Flag_AutoHideSupport)
 {
     connect(m_floatingWindow, &FloatingWindow::numFramesChanged, this, &TitleBar::updateCloseButton);
     connect(m_floatingWindow, &FloatingWindow::numFramesChanged, this, &TitleBar::updateFloatButton);
     connect(m_floatingWindow, &FloatingWindow::numFramesChanged, this, &TitleBar::updateMaximizeButton);
+    connect(m_floatingWindow, &FloatingWindow::numFramesChanged, this, &TitleBar::updateMinimizeButton);
     connect(m_floatingWindow, &FloatingWindow::windowStateChanged, this, &TitleBar::updateMaximizeButton);
     connect(m_floatingWindow, &FloatingWindow::activatedChanged , this, &TitleBar::isFocusedChanged);
     init();
+    updateAutoHideButton(); // always hidden when we're in a FloatingWindow.
 }
 
 void TitleBar::init()
@@ -100,6 +111,11 @@ void TitleBar::focusInEvent(QFocusEvent *ev)
     m_frame->FocusScope::focus(ev->reason());
 }
 
+bool TitleBar::isOverlayed() const
+{
+    return m_frame && m_frame->isOverlayed();
+}
+
 void TitleBar::setTitle(const QString &title)
 {
     if (title != m_title) {
@@ -150,7 +166,7 @@ std::unique_ptr<WindowBeingDragged> TitleBar::makeWindow()
 
     QRect r = m_frame->QWidgetAdapter::geometry();
     qCDebug(hovering) << "TitleBar::makeWindow original geometry" << r;
-    r.moveTopLeft(m_frame->mapToGlobal(QPoint(0, 0))); // TODO: Remove static_cast if it compiles. Ambiguous base for now
+    r.moveTopLeft(m_frame->mapToGlobal(QPoint(0, 0)));
 
     auto floatingWindow = Config::self().frameworkWidgetFactory()->createFloatingWindow(m_frame);
     floatingWindow->setSuggestedGeometry(r);
@@ -177,6 +193,11 @@ bool TitleBar::supportsFloatingButton() const
         return false;
     }
 
+    if (Config::self().flags() & Config::Flag_TitleBarNoFloatButton) {
+        // Was explicitly disabled
+        return false;
+    }
+
     // If we have a floating window with nested dock widgets we can't re-attach, because we don't
     // know where to
     return !m_floatingWindow || m_floatingWindow->hasSingleFrame();
@@ -190,6 +211,20 @@ bool TitleBar::supportsMaximizeButton() const
     return m_floatingWindow != nullptr;
 }
 
+bool TitleBar::supportsMinimizeButton() const
+{
+    if ((Config::self().flags() & Config::Flag_TitleBarHasMinimizeButton) != Config::Flag_TitleBarHasMinimizeButton) // this specific flag is not base^2
+        return false;
+
+    return m_floatingWindow != nullptr;
+}
+
+bool TitleBar::supportsAutoHideButton() const
+{
+    // Only dock widgets docked into the MainWindow can minimize
+    return m_supportsAutoHide && m_frame && m_frame->isInMainWindow();
+}
+
 bool TitleBar::hasIcon() const
 {
     return !m_icon.isNull();
@@ -226,7 +261,6 @@ void TitleBar::onCloseClicked()
 
 bool TitleBar::isFloating() const
 {
-
     if (m_floatingWindow)
         return m_floatingWindow->hasSingleDockWidget(); // Debatable! Maybe it's always floating.
 
@@ -293,3 +327,37 @@ void TitleBar::onMaximizeClicked()
 {
     toggleMaximized();
 }
+
+void TitleBar::onMinimizeClicked()
+{
+    if (!m_floatingWindow)
+        return;
+
+    if (!(Config::self().flags() & Config::Flag_DontUseUtilityFloatingWindows)) {
+        // Qt::Tool windows don't appear in the task bar.
+        // Unless someone tells me a good reason to allow this situation.
+        return;
+    }
+
+    m_floatingWindow->showMinimized();
+}
+
+void TitleBar::onAutoHideClicked()
+{
+    if (!m_frame) {
+        // Doesn't happen
+        qWarning() << Q_FUNC_INFO << "Minimize not supported on floating windows";
+        return;
+    }
+
+    const auto &dockwidgets = m_frame->dockWidgets();
+    for (DockWidgetBase *dw : dockwidgets) {
+        if (dw->isOverlayed()) {
+            // restore
+            MainWindowBase *mainWindow = dw->mainWindow();
+            mainWindow->restoreFromSideBar(dw);
+        } else {
+            dw->moveToSideBar();
+        }
+    }
+}

src/private/TitleBar_p.h

@@ -27,6 +27,8 @@ class QHBoxLayout;
 class QLabel;
 QT_END_NAMESPACE
 
+class TestCommon;
+
 namespace KDDockWidgets {
 
 class DockWidgetBase;
@@ -41,6 +43,7 @@ class DOCKS_EXPORT TitleBar : public QWidgetAdapter
     Q_PROPERTY(bool hasIcon READ hasIcon NOTIFY iconChanged)
 public:
     typedef QVector<TitleBar *> List;
+
     explicit TitleBar(Frame *parent);
     explicit TitleBar(FloatingWindow *parent);
     ~TitleBar() override;
@@ -66,6 +69,12 @@ public:
     ///@brief returns whether this title bar supports a maximize/restore button
     bool supportsMaximizeButton() const;
 
+    ///@brief returns whether this title bar supports a minimize button
+    bool supportsMinimizeButton() const;
+
+    ///@brief returns whether this title bar supports the auto-hide button
+    bool supportsAutoHideButton() const;
+
     ///@brief returns whether this title bar has an icon
     bool hasIcon() const;
 
@@ -94,14 +103,20 @@ Q_SIGNALS:
     void isFocusedChanged();
 
 protected:
+
     Q_INVOKABLE void onCloseClicked();
     Q_INVOKABLE void onFloatClicked();
     Q_INVOKABLE void onMaximizeClicked();
+    Q_INVOKABLE void onMinimizeClicked();
     Q_INVOKABLE void toggleMaximized();
+    Q_INVOKABLE void onAutoHideClicked();
 
     virtual void updateFloatButton() {}
     virtual void updateMaximizeButton() {}
 
+    virtual void updateMinimizeButton() {}
+    virtual void updateAutoHideButton() {}
+
     // The following are needed for the unit-tests
     virtual bool isCloseButtonVisible() const { return true; }
     virtual bool isCloseButtonEnabled() const { return true; }
@@ -110,8 +125,11 @@ protected:
 
     void focusInEvent(QFocusEvent *event) override;
 
+    bool isOverlayed() const;
+
 private:
     friend class TestDocks;
+    friend class ::TestCommon;
 
     void init();
 
@@ -121,6 +139,7 @@ private:
 
     Frame *const m_frame;
     FloatingWindow *const m_floatingWindow;
+    const bool m_supportsAutoHide;
 };
 
 

src/private/Utils_p.h

@@ -30,6 +30,11 @@
 
 namespace KDDockWidgets {
 
+inline bool isWayland()
+{
+    return qApp->platformName() == QLatin1String("wayland");
+}
+
 inline bool isLeftButtonPressed()
 {
     return qApp->mouseButtons() & Qt::LeftButton;
@@ -40,6 +45,17 @@ inline bool usesNativeTitleBar()
     return Config::self().flags() & Config::Flag_NativeTitleBar;
 }
 
+inline bool usesClientTitleBar()
+{
+    if (isWayland()) {
+        // Wayland has both client and native title bars, due to limitations.
+        return true;
+    }
+
+    // All other platforms have either the OS native title bar or a Qt title bar (aka client title bar).
+    return !usesNativeTitleBar();
+}
+
 inline bool usesAeroSnapWithCustomDecos()
 {
     return Config::self().flags() & Config::Flag_AeroSnapWithClientDecos;

src/private/WidgetResizeHandler.cpp

@@ -24,8 +24,10 @@
 #include <QScreen>
 #include <QWindow>
 #include <QAbstractButton>
+#include <QLineEdit>
 
 #if defined(Q_OS_WIN)
+# include <QtGui/private/qhighdpiscaling_p.h>
 # include <Windowsx.h>
 # include <Windows.h>
 # if defined(Q_CC_MSVC)
@@ -247,10 +249,13 @@ bool WidgetResizeHandler::handleWindowsNativeEvent(FloatingWindow *w, const QByt
         } else if (!hasFixedWidth && xPos <= rect.right && xPos >= rect.right - borderWidth) {
             *result = HTRIGHT;
         } else {
-            const QRect htCaptionRect = w->dragRect(); // The rect on which we allow for Windows to do a native drag
+            const QPoint globalPosQt = QHighDpi::fromNativePixels(QPoint(xPos, yPos), w->windowHandle());
-            if (yPos >= htCaptionRect.top() && yPos <= htCaptionRect.bottom() && xPos >= htCaptionRect.left() && xPos <= htCaptionRect.right()) {
+
-                QWidget *hoveredWidget = qApp->widgetAt(QPoint(xPos, yPos));
+            const QRect htCaptionRect = w->dragRect(); // The rect on which we allow for Windows to do Ba native drag
-                if (!qobject_cast<QAbstractButton*>(hoveredWidget)) {
+            if (globalPosQt.y() >= htCaptionRect.top() && globalPosQt.y() <= htCaptionRect.bottom() && globalPosQt.x() >= htCaptionRect.left() && globalPosQt.x() <= htCaptionRect.right()) {
+                QWidget *hoveredWidget = qApp->widgetAt(globalPosQt);
+                if (!qobject_cast<QAbstractButton*>(hoveredWidget) &&
+                    !qobject_cast<QLineEdit*>(hoveredWidget)) { // User might have a line edit on the toolbar. TODO: Not so elegant fix, we should make the user's tabbar implement some virtual method...
                     // User clicked on the title bar, let's allow it, so we get Aero-Snap.
                     *result = HTCAPTION;
                 }
@@ -292,12 +297,17 @@ bool WidgetResizeHandler::handleWindowsNativeEvent(FloatingWindow *w, const QByt
         const QRect availableGeometry = screen->availableGeometry();
 
         auto mmi = reinterpret_cast<MINMAXINFO *>(msg->lParam);
+        const qreal dpr = screen->devicePixelRatio();
 
-        mmi->ptMaxSize.y = availableGeometry.height();
+        mmi->ptMaxSize.y = int(availableGeometry.height() * dpr);
-        mmi->ptMaxSize.x = availableGeometry.width() - 1; // Otherwise it gets bogus size
+        mmi->ptMaxSize.x = int(availableGeometry.width() * dpr) - 1; // -1 otherwise it gets bogus size
         mmi->ptMaxPosition.x = availableGeometry.x();
         mmi->ptMaxPosition.y = availableGeometry.y();
 
+        QWindow *window = w->windowHandle();
+        mmi->ptMinTrackSize.x = int(window->minimumWidth() * dpr);
+        mmi->ptMinTrackSize.y = int(window->minimumHeight() * dpr);
+
         *result = 0;
         return true;
     }

src/private/WindowBeingDragged.cpp

@@ -13,11 +13,15 @@
 #include "DragController_p.h"
 #include "Logging_p.h"
 #include "Utils_p.h"
+#include "DropArea_p.h"
 
 using namespace KDDockWidgets;
 
 static Draggable* bestDraggable(Draggable *draggable)
 {
+    if (!draggable)
+        return nullptr;
+
     // When de detach a title bar it will get hidden and we only the title bar of the FloatingWindow is visible
     /// Apparently that causes problems with grabbing the mouse, so instead use a visible draggable.
     // grabbing mouse on an hidden window works usually, it's some edge case on Windows with MFC.
@@ -45,6 +49,7 @@ static Draggable* bestDraggable(Draggable *draggable)
 WindowBeingDragged::WindowBeingDragged(FloatingWindow *fw, Draggable *draggable)
     : m_floatingWindow(fw)
     , m_draggable(bestDraggable(draggable)->asWidget())
+    , m_affinities(fw->affinities())
 {
     init();
 
@@ -53,6 +58,17 @@ WindowBeingDragged::WindowBeingDragged(FloatingWindow *fw, Draggable *draggable)
     if (!qIsNaN(opacity) && !qFuzzyCompare(1.0, opacity))
         fw->setWindowOpacity(opacity);
 }
+#if DOCKS_DEVELOPER_MODE
+
+// Just used by tests
+WindowBeingDragged::WindowBeingDragged(FloatingWindow *fw)
+    : m_floatingWindow(fw)
+    , m_draggable(nullptr)
+    , m_affinities(fw->affinities())
+{
+}
+
+#endif
 
 WindowBeingDragged::~WindowBeingDragged()
 {
@@ -82,3 +98,36 @@ void WindowBeingDragged::grabMouse(bool grab)
     else
         DragController::instance()->releaseMouse(m_draggable);
 }
+
+QStringList WindowBeingDragged::affinities() const
+{
+    return m_affinities;
+}
+
+QSize WindowBeingDragged::size() const
+{
+    if (m_floatingWindow)
+        return m_floatingWindow->size();
+
+    return QSize();
+}
+
+QSize WindowBeingDragged::minSize() const
+{
+    if (m_floatingWindow) {
+        Layouting::ItemContainer *root = m_floatingWindow->dropArea()->rootItem();
+        return root->minSize();
+    }
+
+    return {};
+}
+
+QSize WindowBeingDragged::maxSize() const
+{
+    if (m_floatingWindow) {
+        Layouting::ItemContainer *root = m_floatingWindow->dropArea()->rootItem();
+        return root->maxSizeHint();
+    }
+
+    return {};
+}

src/private/WindowBeingDragged_p.h

@@ -26,6 +26,11 @@ struct DOCKS_EXPORT_FOR_UNIT_TESTS WindowBeingDragged
 {
 public:
     explicit WindowBeingDragged(FloatingWindow *fw, Draggable *draggable);
+#if DOCKS_DEVELOPER_MODE
+    // For tests.
+    explicit WindowBeingDragged(FloatingWindow *fw);
+#endif
+
     ~WindowBeingDragged();
     void init();
 
@@ -34,10 +39,23 @@ public:
     ///@brief grabs or releases the mouse
     void grabMouse(bool grab);
 
+    ///@brief returns the affinities of the window being dragged
+    QStringList affinities() const;
+
+    ///@brief size of the window being dragged contents
+    QSize size() const;
+
+    /// @brief returns the min-size of the window being dragged contents
+    QSize minSize() const;
+
+    /// @brief returns the max-size of the window being dragged contents
+    QSize maxSize() const;
+
 private:
     Q_DISABLE_COPY(WindowBeingDragged)
     QPointer<FloatingWindow> m_floatingWindow;
     QPointer<QWidgetOrQuick> m_draggable;
+    const QStringList m_affinities;
 };
 }
 

src/private/indicators/ClassicIndicators.cpp

@@ -15,6 +15,7 @@
 #include "Frame_p.h"
 #include "Logging_p.h"
 #include "Config.h"
+#include "DockRegistry_p.h"
 #include "FrameworkWidgetFactory.h"
 #include "ClassicIndicatorsWindow_p.h"
 
@@ -59,6 +60,11 @@ bool ClassicIndicators::outterIndicatorsVisible() const
     return m_outterIndicatorsVisible;
 }
 
+bool ClassicIndicators::tabIndicatorVisible() const
+{
+    return m_tabIndicatorVisible;
+}
+
 bool ClassicIndicators::onResize(QSize)
 {
      m_indicatorWindow->resize(window()->size());
@@ -82,11 +88,21 @@ void ClassicIndicators::updateVisibility()
 
 void ClassicIndicators::updateIndicatorsVisibility(bool visible)
 {
-    Frame *hoveredFrame = m_hoveredFrame;
+    const bool isTheOnlyFrame = m_hoveredFrame && m_hoveredFrame->isTheOnlyFrame();
-    const bool isTheOnlyFrame = hoveredFrame && hoveredFrame->isTheOnlyFrame();
 
-    m_innerIndicatorsVisible = visible && hoveredFrame;
+    m_innerIndicatorsVisible = visible && m_hoveredFrame;
-    m_outterIndicatorsVisible = visible && !isTheOnlyFrame;
+
+    WindowBeingDragged *windowBeingDragged = DragController::instance()->windowBeingDragged();
+
+    // If there's only 1 frame in the layout, the outter indicators are redundant, as they do the same thing as the internal ones.
+    // But there might be another window obscuring our target, so it's useful to show the outter indicators in this case
+    m_outterIndicatorsVisible = visible && (!isTheOnlyFrame ||
+                                            DockRegistry::self()->isProbablyObscured(m_hoveredFrame->window()->windowHandle(), windowBeingDragged));
+
+
+    // Only allow to dock to center if the affinities match
+    m_tabIndicatorVisible = m_innerIndicatorsVisible && windowBeingDragged &&
+                            DockRegistry::self()->affinitiesMatch(m_hoveredFrame->affinities(), windowBeingDragged->affinities());
 
     Q_EMIT innerIndicatorsVisibleChanged();
     Q_EMIT outterIndicatorsVisibleChanged();
@@ -147,7 +163,7 @@ void ClassicIndicators::setDropLocation(ClassicIndicators::DropLocation location
     case DropLocation_Bottom:
         if (!m_hoveredFrame) {
             qWarning() << "ClassicIndicators::setCurrentDropLocation: frame is null. location=" << location
-                       << "; windowBeingDragged=" << m_windowBeingDragged
+                       << "; isHovered=" << isHovered()
                        << "; dropArea->widgets=" << m_dropArea->items();
             Q_ASSERT(false);
             return;
@@ -163,7 +179,9 @@ void ClassicIndicators::setDropLocation(ClassicIndicators::DropLocation location
         break;
     }
 
-    QRect rect = m_dropArea->rectForDrop(m_windowBeingDragged, multisplitterLocation,
+    auto windowBeingDragged = DragController::instance()->windowBeingDragged();
+
+    QRect rect = m_dropArea->rectForDrop(windowBeingDragged, multisplitterLocation,
                                          m_dropArea->itemForFrame(relativeToFrame));
 
     m_rubberBand->setGeometry(rect);

src/private/indicators/ClassicIndicatorsWindow.cpp

@@ -176,12 +176,14 @@ void IndicatorWindow::resizeEvent(QResizeEvent *ev)
 
 void IndicatorWindow::updateIndicatorVisibility()
 {
-    for (Indicator *indicator : { m_center, m_left, m_right, m_bottom, m_top })
+    for (Indicator *indicator : { m_left, m_right, m_bottom, m_top })
         indicator->setVisible(classicIndicators->innerIndicatorsVisible());
 
     for (Indicator *indicator : { m_outterTop, m_outterLeft, m_outterRight, m_outterBottom })
         indicator->setVisible(classicIndicators->outterIndicatorsVisible());
 
+    m_center->setVisible(classicIndicators->tabIndicatorVisible());
+
     updateMask();
 }
 
@@ -239,8 +241,9 @@ IndicatorWindow::IndicatorWindow(KDDockWidgets::ClassicIndicators *classicIndica
     : QQuickView()
     , m_classicIndicators(classicIndicators)
 {
+    setFlags(flags() | Qt::FramelessWindowHint | Qt::BypassWindowManagerHint | Qt::Tool);
     setColor(Qt::transparent);
-    setFlags(flags() | Qt::FramelessWindowHint);
+
     rootContext()->setContextProperty(QStringLiteral("_window"), QVariant::fromValue<QObject*>(this));
     setSource(QUrl(QStringLiteral("qrc:/kddockwidgets/private/quick/qml/ClassicIndicatorsOverlay.qml")));
 }

src/private/indicators/ClassicIndicators_p.h

@@ -35,6 +35,9 @@ public:
     bool innerIndicatorsVisible() const;
     bool outterIndicatorsVisible() const;
 
+    // The tab/center indicator
+    bool tabIndicatorVisible() const;
+
 protected:
     bool onResize(QSize newSize) override;
     void updateVisibility() override;
@@ -53,6 +56,7 @@ private:
     IndicatorWindow *const m_indicatorWindow;
     bool m_innerIndicatorsVisible = false;
     bool m_outterIndicatorsVisible = false;
+    bool m_tabIndicatorVisible = false;
 };
 
 }

src/private/multisplitter/CMakeLists.txt

@@ -38,7 +38,7 @@ set(MULTISPLITTER_SRCS_QTQUICK
 )
 
 option(BUILD_MULTISPLITTER_QTWIDGETS_FRONTEND "Build support for QtWidgets" ON)
-if (OPTION_QTQUICK)
+if (${PROJECT_NAME}_QTQUICK)
     # We're building the layouting engine as part of KDDW. If KDDW has set to build with QtQuick
     # then so does the layouting engine
     SET(BUILD_MULTISPLITTER_QTQUICK_FRONTEND ON)
@@ -79,7 +79,7 @@ else()
   target_compile_definitions(kddockwidgets_multisplitter PRIVATE BUILDING_MULTISPLITTER_LIBRARY)
 endif()
 
-if(OPTION_DEVELOPER_MODE)
+if(${PROJECT_NAME}_DEVELOPER_MODE)
   # Under developer mode since kddw might be a sub-folder of a project setting a different value for QT_DISABLE_DEPRECATED_BEFORE
   target_compile_definitions(kddockwidgets_multisplitter PRIVATE QT_DISABLE_DEPRECATED_BEFORE=0x060000)
 

src/private/multisplitter/Item.cpp

@@ -177,9 +177,9 @@ void Item::setGuestWidget(Widget *guest)
     m_guest = guest;
 
     if (m_guest) {
+        m_guest->setParent(m_hostWidget);
         m_guest->setLayoutItem(this);
         newWidget->installEventFilter(this);
-        m_guest->setParent(m_hostWidget);
         setMinSize(guest->minSize());
         setMaxSizeHint(guest->maxSizeHint());
 
@@ -279,7 +279,12 @@ QObject *Item::host() const
 
 void Item::restore(Widget *guest)
 {
-    Q_ASSERT(!isVisible() && !guestAsQObject());
+    if (isVisible() || guestAsQObject()) {
+        qWarning() << Q_FUNC_INFO << "Hitting assert. visible="
+                   << isVisible() << "; guest=" << guestAsQObject();
+        Q_ASSERT(false);
+    }
+
     if (isContainer()) {
         qWarning() << Q_FUNC_INFO << "Containers can't be restored";
     } else {
@@ -634,9 +639,14 @@ bool Item::checkSanity()
 
     if (m_guest) {
         if (m_guest->parent() != hostWidget()->asQObject()) {
-            qWarning() << Q_FUNC_INFO << "Unexpected parent for our guest"
+            if (root())
-                       << m_guest->parent() << "; host=" << hostWidget()
+                root()->dumpLayout();
-                       << m_guest->asQObject() << this;
+            qWarning() << Q_FUNC_INFO << "Unexpected parent for our guest. guest.parent="
+                       << m_guest->parent() << "; host=" << hostWidget()->asQObject()
+                       << "; guest.asObj=" << m_guest->asQObject()
+                       << "; this=" << this
+                       << "; item.parentContainer=" << parentContainer()
+                       << "; item.root.parent=" << (root() ? root()->parent() : nullptr);
             return false;
         }
 
@@ -660,13 +670,6 @@ bool Item::checkSanity()
             return false;
         }
     }
-return true;
-    if (!isVisible()) {
-        if (m_guest && m_guest->isVisible()) {
-            qWarning() << Q_FUNC_INFO << "Item is not visible but guest is visible";
-            return false;
-        }
-    }
 
     return true;
 }
@@ -843,6 +846,75 @@ bool Item::isRoot() const
     return m_parent == nullptr;
 }
 
+Item::LayoutBorderLocations Item::adjacentLayoutBorders() const
+{
+    if (isRoot()) {
+        return Item::LayoutBorderLocation_All;
+    }
+
+    ItemContainer *c = parentContainer();
+    if (!c)
+        return Item::LayoutBorderLocation_None;
+
+    const int indexInParent = c->indexOfVisibleChild(this);
+    const int numVisibleChildren = c->numVisibleChildren();
+    const bool isFirst = indexInParent == 0;
+    const bool isLast = indexInParent == numVisibleChildren - 1;
+    if (indexInParent == -1)
+        return Item::LayoutBorderLocation_None;
+
+    Item::LayoutBorderLocations locations = Item::LayoutBorderLocation_None;
+    if (c->isRoot()) {
+        if (c->isVertical()) {
+            locations |= Item::LayoutBorderLocation_West;
+            locations |= Item::LayoutBorderLocation_East;
+
+            if (isFirst)
+                locations |= Item::LayoutBorderLocation_North;
+            if (isLast)
+                locations |= Item::LayoutBorderLocation_South;
+        } else {
+            locations |= Item::LayoutBorderLocation_North;
+            locations |= Item::LayoutBorderLocation_South;
+
+            if (isFirst)
+                locations |= Item::LayoutBorderLocation_West;
+            if (isLast)
+                locations |= Item::LayoutBorderLocation_East;
+        }
+    } else {
+        const Item::LayoutBorderLocations parentBorders = c->adjacentLayoutBorders();
+        if (c->isVertical()) {
+            if (parentBorders & Item::LayoutBorderLocation_West)
+                locations |= Item::LayoutBorderLocation_West;
+
+            if (parentBorders & Item::LayoutBorderLocation_East)
+                locations |= Item::LayoutBorderLocation_East;
+
+            if (isFirst && (parentBorders & Item::LayoutBorderLocation_North))
+                locations |= Item::LayoutBorderLocation_North;
+
+            if (isLast && (parentBorders & Item::LayoutBorderLocation_South))
+                locations |= Item::LayoutBorderLocation_South;
+
+        } else {
+            if (parentBorders & Item::LayoutBorderLocation_North)
+                locations |= Item::LayoutBorderLocation_North;
+
+            if (parentBorders & Item::LayoutBorderLocation_South)
+                locations |= Item::LayoutBorderLocation_South;
+
+            if (isFirst && (parentBorders & Item::LayoutBorderLocation_West))
+                locations |= Item::LayoutBorderLocation_West;
+
+            if (isLast && (parentBorders & Item::LayoutBorderLocation_East))
+                locations |= Item::LayoutBorderLocation_East;
+        }
+    }
+
+    return locations;
+}
+
 int Item::visibleCount_recursive() const
 {
     return isVisible() ? 1 : 0;
@@ -856,6 +928,12 @@ struct ItemContainer::Private
         (void) Config::self(); // Ensure Config ctor runs, as it registers qml types
     }
 
+    ~Private()
+    {
+        qDeleteAll(m_separators);
+        m_separators.clear();
+    }
+
     int defaultLengthFor(Item *item, DefaultSizeMode) const;
     bool isOverflowing() const;
     void relayoutIfNeeded();
@@ -3133,8 +3211,8 @@ void ItemContainer::simplify()
             childContainer->simplify(); // recurse down the hierarchy
 
             if (childContainer->orientation() == d->m_orientation || childContainer->d->m_children.size() == 1) {
-                // This sub-container is reduntant, as it has the same orientation as its parent
+                // This sub-container is redundant, as it has the same orientation as its parent
-                // Canibalize it.
+                // Cannibalize it.
                 for (Item *child2 : childContainer->childItems()) {
                     child2->setParentContainer(this);
                     newChildren.push_back(child2);
@@ -3270,7 +3348,7 @@ void ItemContainer::fillFromVariantMap(const QVariantMap &map,
 
     for (const QVariant &childV : childrenV) {
         const QVariantMap childMap = childV.toMap();
-        const bool isContainer = childMap[QStringLiteral("isContainer")].toBool();
+        const bool isContainer = childMap.value(QStringLiteral("isContainer")).toBool();
         Item *child = isContainer ? new ItemContainer(hostWidget(), this)
                                   : new Item(hostWidget(), this);
         child->fillFromVariantMap(childMap, widgets);