Fixed sizeHints and sizePolicies to properly support different font sizes i.e. set via QApplication::setFont

Author: githubuser0xFFFF

src/DockAreaTabBar.cpp

@@ -113,7 +113,7 @@ CDockAreaTabBar::CDockAreaTabBar(CDockAreaWidget* parent) :
 	d(new DockAreaTabBarPrivate(this))
 {
 	d->DockArea = parent;
-	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Ignored);
+	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
 	setFrameStyle(QFrame::NoFrame);
 	setWidgetResizable(true);
 	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
@@ -565,6 +565,23 @@ bool CDockAreaTabBar::isTabOpen(int Index) const
 	return !tab(Index)->isHidden();
 }
 
+
+//===========================================================================
+QSize CDockAreaTabBar::minimumSizeHint() const
+{
+	QSize Size = sizeHint();
+	Size.setWidth(Super::minimumSizeHint().width());// this defines the minimum width of a dock area
+	return Size;
+}
+
+//===========================================================================
+QSize CDockAreaTabBar::sizeHint() const
+{
+	QSize Size = Super::sizeHint();
+	Size.setHeight(d->TabsContainerWidget->sizeHint().height());
+	return Size;
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaTabBar.h

@@ -156,6 +156,21 @@ private slots:
 	 */
 	bool isTabOpen(int Index) const;
 
+	/**
+	 * Overrides the minimumSizeHint() function of QScrollArea
+	 * The minimumSizeHint() is bigger than the sizeHint () for the scroll
+	 * area because even if the scrollbars are invisible, the required speace
+	 * is reserved in the minimumSizeHint(). This override simply returns
+	 * sizeHint();
+	 */
+	virtual QSize minimumSizeHint() const override;
+
+	/**
+	 * The function provides a sizeHint that matches the height of the
+	 * internal viewport.
+	 */
+	virtual QSize sizeHint() const override;
+
 public slots:
 	/**
 	 * This property sets the index of the tab bar's visible tab

src/DockAreaTitleBar.cpp

@@ -130,6 +130,7 @@ DockAreaTitleBarPrivate::DockAreaTitleBarPrivate(CDockAreaTitleBar* _public) :
 //============================================================================
 void DockAreaTitleBarPrivate::createButtons()
 {
+	QSizePolicy ButtonSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
     // Tabs menu button
 	TabsMenuButton = new tTileBarButton();
 	TabsMenuButton->setObjectName("tabsMenuButton");
@@ -145,7 +146,7 @@ void DockAreaTitleBarPrivate::createButtons()
 #ifndef QT_NO_TOOLTIP
 	TabsMenuButton->setToolTip(QObject::tr("List all tabs"));
 #endif
-	TabsMenuButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
+	TabsMenuButton->setSizePolicy(ButtonSizePolicy);
 	TopLayout->addWidget(TabsMenuButton, 0);
 	_this->connect(TabsMenuButton->menu(), SIGNAL(triggered(QAction*)),
 		SLOT(onTabsMenuActionTriggered(QAction*)));
@@ -159,7 +160,7 @@ void DockAreaTitleBarPrivate::createButtons()
 	UndockButton->setToolTip(QObject::tr("Detach Group"));
 #endif
     setTitleBarButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton);
-    UndockButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
+    UndockButton->setSizePolicy(ButtonSizePolicy);
 	TopLayout->addWidget(UndockButton, 0);
 	_this->connect(UndockButton, SIGNAL(clicked()), SLOT(onUndockButtonClicked()));
 
@@ -179,7 +180,7 @@ void DockAreaTitleBarPrivate::createButtons()
 		CloseButton->setToolTip(QObject::tr("Close Group"));
 	}
 #endif
-	CloseButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
+	CloseButton->setSizePolicy(ButtonSizePolicy);
 	CloseButton->setIconSize(QSize(16, 16));
 	if (testConfigFlag(CDockManager::DockAreaHasCloseButton))
 	{