#ifndef DockContainerWidgetH
#define DockContainerWidgetH
/*******************************************************************************
** Qt Advanced Docking System
** Copyright (C) 2017 Uwe Kindler
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/


//============================================================================
/// \file   DockContainerWidget.h
/// \author Uwe Kindler
/// \date   24.02.2017
/// \brief  Declaration of CDockContainerWidget class
//============================================================================


//============================================================================
//                                   INCLUDES
//============================================================================
#include <QFrame>

#include "ads_globals.h"
#include "DockWidget.h"

QT_FORWARD_DECLARE_CLASS(QXmlStreamWriter)


namespace ads
{
class DockContainerWidgetPrivate;
class CDockAreaWidget;
class CDockWidget;
class CDockManager;
struct DockManagerPrivate;
class CFloatingDockContainer;
struct FloatingDockContainerPrivate;
class CFloatingDragPreview;
struct FloatingDragPreviewPrivate;
class CDockingStateReader;

/**
 * Container that manages a number of dock areas with single dock widgets
 * or tabyfied dock widgets in each area.
 * Each window that support docking has a DockContainerWidget. That means
 * the main application window and all floating windows contain a 
 * DockContainerWidget instance.
 */
class ADS_EXPORT CDockContainerWidget : public QFrame
{
	Q_OBJECT
private:
	DockContainerWidgetPrivate* d; ///< private data (pimpl)
    friend class DockContainerWidgetPrivate;
	friend class CDockManager;
	friend struct DockManagerPrivate;
	friend class CDockAreaWidget;
	friend struct DockAreaWidgetPrivate;
	friend class CFloatingDockContainer;
	friend struct FloatingDockContainerPrivate;
	friend class CDockWidget;
	friend class CFloatingDragPreview;
	friend struct FloatingDragPreviewPrivate;

protected:
	/**
	 * Handles activation events to update zOrderIndex
	 */
	virtual bool event(QEvent *e) override;

	/**
	 * Access function for the internal root splitter
	 */
	QSplitter* rootSplitter() const;

	/**
	 * Helper function for creation of the root splitter
	 */
	void createRootSplitter();

	/**
	 * Drop floating widget into the container
	 */
	void dropFloatingWidget(CFloatingDockContainer* FloatingWidget, const QPoint& TargetPos);

	/**
	 * Drop a dock area or a dock widget given in widget parameter.
	 * If the TargetAreaWidget is a nullptr, then the DropArea indicates
	 * the drop area for the container. If the given TargetAreaWidget is not
	 * a nullptr, then the DropArea indicates the drop area in the given
	 * TargetAreaWidget
	 */
	void dropWidget(QWidget* Widget, DockWidgetArea DropArea, CDockAreaWidget* TargetAreaWidget);

	/**
	 * Adds the given dock area to this container widget
	 */
	void addDockArea(CDockAreaWidget* DockAreaWidget, DockWidgetArea area = CenterDockWidgetArea);

	/**
	 * Removes the given dock area from this container
	 */
	void removeDockArea(CDockAreaWidget* area);

	/**
	 * Saves the state into the given stream
	 */
	void saveState(QXmlStreamWriter& Stream) const;

	/**
	 * Restores the state from given stream.
	 * If Testing is true, the function only parses the data from the given
	 * stream but does not restore anything. You can use this check for
	 * faulty files before you start restoring the state
	 */
	bool restoreState(CDockingStateReader& Stream, bool Testing);

	/**
	 * This function returns the last added dock area widget for the given
	 * area identifier or 0 if no dock area widget has been added for the given
	 * area
	 */
	CDockAreaWidget* lastAddedDockAreaWidget(DockWidgetArea area) const;

	/**
	 * If hasSingleVisibleDockWidget() returns true, this function returns the
	 * one and only visible dock widget. Otherwise it returns a nullptr.
	 */
	CDockWidget* topLevelDockWidget() const;

	/**
	 * Returns the top level dock area.
	 */
	CDockAreaWidget* topLevelDockArea() const;

    /**
     * This function returns a list of all dock widgets in this floating widget.
     * It may be possible, depending on the implementation, that dock widgets,
     * that are not visible to the user have no parent widget. Therefore simply
     * calling findChildren() would not work here. Therefore this function
     * iterates over all dock areas and creates a list that contains all
     * dock widgets returned from all dock areas.
     */
    QList<CDockWidget*> dockWidgets() const;

    /**
     * This function forces the dock container widget to update handles of splitters
     * based on resize modes of dock widgets contained in the container.
     */
    void updateSplitterHandles(QSplitter* splitter);

public:
	/**
	 * Default Constructor
	 */
	CDockContainerWidget(CDockManager* DockManager, QWidget* parent = 0);

	/**
	 * Virtual Destructor
	 */
	virtual ~CDockContainerWidget();

	/**
	 * Adds dockwidget into the given area.
	 * If DockAreaWidget is not null, then the area parameter indicates the area
	 * into the DockAreaWidget. If DockAreaWidget is null, the Dockwidget will
	 * be dropped into the container.
	 * \return Returns the dock area widget that contains the new DockWidget
	 */
	CDockAreaWidget* addDockWidget(DockWidgetArea area, CDockWidget* Dockwidget,
		CDockAreaWidget* DockAreaWidget = nullptr);

	/**
	 * Removes dockwidget
	 */
	void removeDockWidget(CDockWidget* Dockwidget);

	/**
	 * Returns the current zOrderIndex
	 */
	virtual unsigned int zOrderIndex() const;

	/**
	 * This function returns true if this container widgets z order index is
	 * higher than the index of the container widget given in Other parameter
	 */
	bool isInFrontOf(CDockContainerWidget* Other) const;

	/**
	 * Returns the dock area at the given global position or 0 if there is no
	 * dock area at this position
	 */
	CDockAreaWidget* dockAreaAt(const QPoint& GlobalPos) const;

	/**
	 * Returns the dock area at the given Index or 0 if the index is out of
	 * range
	 */
	CDockAreaWidget* dockArea(int Index) const;

	/**
	 * Returns the list of dock areas that are not closed
	 * If all dock widgets in a dock area are closed, the dock area will be closed
	 */
	QList<CDockAreaWidget*> openedDockAreas() const;

    /**
     * This function returns true if this dock area has only one single
     * visible dock widget.
     * A top level widget is a real floating widget. Only the isFloating()
     * function of top level widgets may returns true.
     */
    bool hasTopLevelDockWidget() const;

	/**
	 * Returns the number of dock areas in this container
	 */
	int dockAreaCount() const;

	/**
	 * Returns the number of visible dock areas
	 */
	int visibleDockAreaCount() const;

	/**
	 * This function returns true, if this container is in a floating widget
	 */
	bool isFloating() const;

	/**
	 * Dumps the layout for debugging purposes
	 */
	void dumpLayout();

	/**
	 * This functions returns the dock widget features of all dock widget in
	 * this container.
	 * A bitwise and is used to combine the flags of all dock widgets. That
	 * means, if only dock widget does not support a certain flag, the whole
	 * dock are does not support the flag.
	 */
	CDockWidget::DockWidgetFeatures features() const;

	/**
	 * If this dock container is in a floating widget, this function returns
	 * the floating widget.
	 * Else, it returns a nullptr.
	 */
	CFloatingDockContainer* floatingWidget() const;

	/**
	 * Call this function to close all dock areas except the KeepOpenArea
	 */
	void closeOtherAreas(CDockAreaWidget* KeepOpenArea);

Q_SIGNALS:
	/**
	 * This signal is emitted if one or multiple dock areas has been added to
	 * the internal list of dock areas.
	 * If multiple dock areas are inserted, this signal is emitted only once
	 */
	void dockAreasAdded();

	/**
	 * This signal is emitted if one or multiple dock areas has been removed
	 */
	void dockAreasRemoved();

	/**
	 * This signal is emitted if a dock area is opened or closed via
	 * toggleView() function
	 */
	void dockAreaViewToggled(ads::CDockAreaWidget* DockArea, bool Open);
}; // class DockContainerWidget
} // namespace ads
//-----------------------------------------------------------------------------
#endif // DockContainerWidgetH