windows: Port system move support

src/Window.cpp

@@ -11,6 +11,8 @@
 
 #include "Window.h"
 
+#include <QDebug>
+
 using namespace KDDockWidgets;
 
 Window::~Window() = default;
@@ -34,3 +36,9 @@ int Window::maxHeight() const
 {
     return maxSize().height();
 }
+
+void Window::startSystemMove()
+{
+    qFatal("Not needed in this platform");
+}
+

src/Window.h

@@ -92,6 +92,7 @@ public:
     virtual QSize minSize() const = 0;
     virtual QSize maxSize() const = 0;
     virtual QPoint fromNativePixels(QPoint) const = 0;
+    virtual void startSystemMove();
 
     int minWidth() const;
     int minHeight() const;

src/private/DragController.cpp

@@ -292,7 +292,7 @@ void StateDragging::onEntry()
     const bool needsUndocking = !q->m_draggable->isWindow();
     q->m_windowBeingDragged = q->m_draggable->makeWindow();
     if (q->m_windowBeingDragged) {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0) && defined(Q_OS_WIN_TODO)
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0) && defined(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, so we can still get aero-snap
@@ -301,7 +301,7 @@ void StateDragging::onEntry()
             q->m_windowBeingDragged.reset();
             q->m_windowBeingDragged = fw->makeWindow();
 
-            QWindow *window = fw->window();
+            Window::Ptr window = fw->view()->window();
 
             if (needsUndocking) {
                 // Position the window before the drag start, otherwise if you move mouse too fast there will be an offset
@@ -901,7 +901,7 @@ ViewWrapper::Ptr DragController::qtTopLevelUnderCursor() const
                 return nullptr;
             }
         }
-#endif // Q_OS_WIN_TODO
+#endif // Q_OS_WIN
     } else if (linksToXLib() && isXCB()) {
         bool ok = false;
         const Window::List orderedWindows = KDDockWidgets::orderedWindows(ok);

src/qtcommon/Window_qt.cpp

@@ -145,3 +145,8 @@ QPoint Window_qt::fromNativePixels(QPoint nativePos) const
 {
     return QHighDpi::fromNativePixels(nativePos, m_window.data());
 }
+
+void Window_qt::startSystemMove()
+{
+    m_window->startSystemMove();
+}

src/qtcommon/Window_qt.h

@@ -50,6 +50,7 @@ public:
     QSize minSize() const override;
     QSize maxSize() const override;
     QPoint fromNativePixels(QPoint) const override;
+    void startSystemMove() override;
 
 protected:
     QPointer<QWindow> m_window;