Added CDockComponentsFactory for creation of components for the docking framework

src/DockComponentsFactory.h

@@ -0,0 +1,69 @@
+#ifndef DockComponentsFactoryH
+#define DockComponentsFactoryH
+//============================================================================
+/// \file   DockComponentsFactory.h
+/// \author Uwe Kindler
+/// \date   10.02.2020
+/// \brief  Declaration of DockComponentsFactory
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+namespace ads
+{
+class CDockWidgetTab;
+class CDockAreaTitleBar;
+class CDockAreaTabBar;
+class CDockAreaWidget;
+class CDockWidget;
+
+
+
+/**
+ * Factory for creation of certain GUI elements for the docking framework.
+ * A default unique instance provided by CDockComponentsFactory is used for
+ * creation of all supported components. To inject your custom components,
+ * you can create your own derived dock components factory and register
+ * it via setDefaultFactory() function.
+ * \code
+ * CDockComponentsFactory::setDefaultFactory(new MyComponentsFactory()));
+ * \endcode
+ */
+class CDockComponentsFactory
+{
+public:
+	/**
+	 * Force virtual destructor
+	 */
+	virtual ~CDockComponentsFactory() {}
+
+	virtual CDockWidgetTab* createDockWidgetTab(CDockWidget* DockWidget) const;
+	virtual CDockAreaTabBar* createDockAreaTabBar(CDockAreaWidget* DockArea) const;
+	virtual CDockAreaTitleBar* createDockAreaTitleBar(CDockAreaWidget* DockArea) const;
+
+	/**
+	 * Returns the default components factory
+	 */
+	static const CDockComponentsFactory* defaultFactory();
+
+	/**
+	 * Sets a new default factory for creation of GUI elements.
+	 * This function takes ownership of the given Factory.
+	 */
+	static void setDefaultFactory(CDockComponentsFactory* Factory);
+};
+
+
+/**
+ * Convenience function to ease factory instance access
+ */
+inline const CDockComponentsFactory* componentsFactory()
+{
+	return CDockComponentsFactory::defaultFactory();
+}
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+#endif // DockComponentsFactoryH