Added Config::setDisabledPaintEvents()

Makes our internal widgets not override QWidget::paintEvent(),
which gives full power to the user to stylesheets.

Was already possible, but required the user to override the
internal widgets via the widget factory

For issue #146

src/Config.cpp

@@ -56,6 +56,7 @@ public:
     FrameworkWidgetFactory *m_frameworkWidgetFactory = nullptr;
     Flags m_flags = Flag_Default;
     InternalFlags m_internalFlags = InternalFlag_None;
+    CustomizableWidgets m_disabledPaintEvents = CustomizableWidget_None;
     qreal m_draggedWindowOpacity = Q_QNAN;
 };
 
@@ -292,4 +293,14 @@ void Config::Private::fixFlags()
     }
 }
 
+void Config::setDisabledPaintEvents(CustomizableWidgets widgets)
+{
+    d->m_disabledPaintEvents = widgets;
+}
+
+Config::CustomizableWidgets Config::disabledPaintEvents() const
+{
+    return d->m_disabledPaintEvents;
+}
+
 }

src/Config.h

@@ -220,6 +220,13 @@ public:
     void setAbsoluteWidgetMaxSize(QSize size);
     QSize absoluteWidgetMaxSize() const;
 
+    ///@brief Disables our internal widget's paint events
+    /// By default, KDDockWidget's internal widgets reimplement paintEvent(). Disabling them
+    /// (which makes the base-class, QWidget::paintEvent() be called instead) can be useful if you want to style
+    // via CSS stylesheets.
+    void setDisabledPaintEvents(CustomizableWidgets);
+    Config::CustomizableWidgets disabledPaintEvents() const;
+
     ///@internal
     ///@brief returns the internal flags.
     ///@warning Not for public consumption, support will be limited.

src/private/multisplitter/Separator_qwidget.cpp

@@ -12,6 +12,7 @@
 #include "Separator_qwidget.h"
 #include "Widget_qwidget.h"
 #include "Logging_p.h"
+#include "Config.h"
 
 #include <QPainter>
 #include <QStyleOption>
@@ -28,8 +29,13 @@ SeparatorWidget::SeparatorWidget(Layouting::Widget *parent)
     setMouseTracking(true);
 }
 
-void SeparatorWidget::paintEvent(QPaintEvent *)
+void SeparatorWidget::paintEvent(QPaintEvent *ev)
 {
+    if (KDDockWidgets::Config::self().disabledPaintEvents() & KDDockWidgets::Config::CustomizableWidget_Separator) {
+        QWidget::paintEvent(ev);
+        return;
+    }
+
     QPainter p(this);
 
     QStyleOption opt;

src/private/widgets/FloatingWindowWidget.cpp

@@ -36,8 +36,13 @@ FloatingWindowWidget::FloatingWindowWidget(Frame *frame, MainWindowBase *parent)
     init();
 }
 
-void FloatingWindowWidget::paintEvent(QPaintEvent *)
+void FloatingWindowWidget::paintEvent(QPaintEvent *ev)
 {
+    if (Config::self().disabledPaintEvents() & Config::CustomizableWidget_FloatingWindow) {
+        QWidget::paintEvent(ev);
+        return;
+    }
+
     QPainter p(this);
     QPen pen(0x666666);
     pen.setWidth(1);