DockAreaWidget now properly considers minimumSizeHint() of contained DockWidgets

Added setMinimumSizeHintMode() test in demo MainWindow

demo/MainWindow.cpp

@@ -224,11 +224,27 @@ static ads::CDockWidget* createEditorWidget(QMenu* ViewMenu)
 }
 
 
+//===========================================================================
+/**
+ * Custom QTableWidget with a minimum size hint to test CDockWidget
+ * setMinimumSizeHintMode() function of CDockWidget
+ */
+class CMinSizeTableWidget : public QTableWidget
+{
+public:
+	using QTableWidget::QTableWidget;
+	virtual QSize minimumSizeHint() const override
+	{
+		return QSize(300, 100);
+	}
+};
+
+
 //============================================================================
 static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
 {
 	static int TableCount = 0;
-	QTableWidget* w = new QTableWidget();
+	auto w = new CMinSizeTableWidget();
 	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Table %1").arg(TableCount++));
 	static int colCount = 5;
 	static int rowCount = 30;
@@ -244,6 +260,7 @@ static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
 	}
 	DockWidget->setWidget(w);
 	DockWidget->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
+	DockWidget->setMinimumSizeHintMode(ads::CDockWidget::MinimumSizeHintFromContent);
 	ViewMenu->addAction(DockWidget->toggleViewAction());
 	return DockWidget;
 }

sip/DockWidget.sip

@@ -50,6 +50,12 @@ public:
 		ForceScrollArea,
 		ForceNoScrollArea
 	};
+	
+    enum eMinimumSizeHintMode
+    {
+    	MinimumSizeHintFromDockWidget,
+    	MinimumSizeHintFromContent
+    };
 
 	enum eToggleViewActionMode
 	{
@@ -76,6 +82,7 @@ public:
 	bool isClosed() const;
 	QAction* toggleViewAction() const;
 	void setToggleViewActionMode(ads::CDockWidget::eToggleViewActionMode Mode);
+	void setMinimumSizeHintMode(ads::CDockWidget::eMinimumSizeHintMode Mode);
 	void setIcon(const QIcon& Icon);
 	QIcon icon() const;
 	QToolBar* toolBar() const;

src/DockAreaWidget.cpp

@@ -247,6 +247,7 @@ struct DockAreaWidgetPrivate
 	CDockManager*		DockManager		= nullptr;
 	bool UpdateTitleBarButtons = false;
 	DockWidgetAreas		AllowedAreas	= AllDockAreas;
+	QSize MinSizeHint;
 
 	/**
 	 * Private data constructor
@@ -303,6 +304,20 @@ struct DockAreaWidgetPrivate
 	 * Udpates the enable state of the close and detach button
 	 */
 	void updateTitleBarButtonStates();
+
+	/**
+	 * Scans all contained dock widgets for the max. minimum size hint
+	 */
+	void updateMinimumSizeHint()
+	{
+		MinSizeHint = QSize();
+		for (int i = 0; i < ContentsLayout->count(); ++i)
+		{
+			auto Widget = ContentsLayout->widget(i);
+			MinSizeHint.setHeight(qMax(MinSizeHint.height(), Widget->minimumSizeHint().height()));
+			MinSizeHint.setWidth(qMax(MinSizeHint.width(), Widget->minimumSizeHint().width()));
+		}
+	}
 };
 // struct DockAreaWidgetPrivate
 
@@ -407,6 +422,8 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 	d->tabBar()->blockSignals(false);
 	TabWidget->setVisible(!DockWidget->isClosed());
 	DockWidget->setProperty(INDEX_PROPERTY, index);
+	d->MinSizeHint.setHeight(qMax(d->MinSizeHint.height(), DockWidget->minimumSizeHint().height()));
+	d->MinSizeHint.setWidth(qMax(d->MinSizeHint.width(), DockWidget->minimumSizeHint().width()));
 	if (Activate)
 	{
 		setCurrentIndex(index);
@@ -447,6 +464,7 @@ void CDockAreaWidget::removeDockWidget(CDockWidget* DockWidget)
 
 	d->updateTitleBarButtonStates();
 	updateTitleBarVisibility();
+	d->updateMinimumSizeHint();
 	auto TopLevelDockWidget = DockContainer->topLevelDockWidget();
 	if (TopLevelDockWidget)
 	{
@@ -863,6 +881,13 @@ CDockAreaTitleBar* CDockAreaWidget::titleBar() const
 {
 	return d->TitleBar;
 }
+
+
+//============================================================================
+QSize CDockAreaWidget::minimumSizeHint() const
+{
+	return d->MinSizeHint.isValid() ? d->MinSizeHint : Super::minimumSizeHint();
+}
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaWidget.h

@@ -164,6 +164,13 @@ public:
 	 */
 	CDockContainerWidget* dockContainer() const;
 
+    /**
+     * Returns the largest minimumSizeHint() of the dock widgets in this
+     * area.
+     * The minimum size hint is updated if a dock widget is removed or added.
+     */
+    virtual QSize minimumSizeHint() const override;
+
 	/**
 	 * Returns the rectangle of the title area
 	 */

src/DockWidget.h

@@ -242,7 +242,8 @@ public:
     virtual ~CDockWidget();
 
     /**
-     * We return a fixed minimum size hint for all dock widgets
+     * We return a fixed minimum size hint or the size hint of the content
+     * widget if minimum size hint mode is MinimumSizeHintFromContent
      */
     virtual QSize minimumSizeHint() const override;