#ifndef FloatingDockContainerH
#define FloatingDockContainerH
/*******************************************************************************
** 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   FloatingDockContainer.h
/// \author Uwe Kindler
/// \date   01.03.2017
/// \brief  Declaration of CFloatingDockContainer class
//============================================================================

//============================================================================
//                                   INCLUDES
//============================================================================
#include "ads_globals.h"

#include <QRubberBand>

#ifdef Q_OS_LINUX
#include <QDockWidget>
#define tFloatingWidgetBase QDockWidget
#else
#include <QWidget>
#define tFloatingWidgetBase QWidget
#endif

class CDockingStateReader;

namespace ads
{
struct FloatingDockContainerPrivate;
class CDockManager;
struct DockManagerPrivate;
class CDockAreaWidget;
class CDockContainerWidget;
class CDockWidget;
class CDockManager;
class CDockAreaTabBar;
class CDockWidgetTab;
struct DockWidgetTabPrivate;
class CDockAreaTitleBar;
struct DockAreaTitleBarPrivate;
class CFloatingWidgetTitleBar;
class CDockingStateReader;

/**
 * Pure virtual interface for floating widgets.
 * This interface is used for opaque and non-opaque undocking. If opaque
 * undocking is used, the a real CFloatingDockContainer widget will be created
 */
class IFloatingWidget
{
public:
    virtual ~IFloatingWidget() = default;

	/**
	 * Starts floating.
	 * This function should get called typically from a mouse press event
	 * handler
	 */
	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
        eDragState DragState, QWidget* MouseEventHandler) = 0;

	/**
	 * Moves the widget to a new position relative to the position given when
	 * startFloating() was called.
	 * This function should be called from a mouse mouve event handler to
	 * move the floating widget on mouse move events.
	 */
	virtual void moveFloating() = 0;

	/**
	 * Tells the widget that to finish dragging if the mouse is released.
	 * This function should be called from a mouse release event handler
	 * to finish the dragging
	 */
	virtual void finishDragging() = 0;
};


/**
 * This implements a floating widget that is a dock container that accepts
 * docking of dock widgets like the main window and that can be docked into
 * another dock container.
 * Every floating window of the docking system is a FloatingDockContainer.
 */
class ADS_EXPORT CFloatingDockContainer : public tFloatingWidgetBase, public IFloatingWidget
{
	Q_OBJECT
private:
	FloatingDockContainerPrivate* d; ///< private data (pimpl)
	friend struct FloatingDockContainerPrivate;
	friend class CDockManager;
	friend struct DockManagerPrivate;
	friend class CDockAreaTabBar;
	friend struct DockWidgetTabPrivate;
	friend class CDockWidgetTab;
	friend class CDockAreaTitleBar;
	friend struct DockAreaTitleBarPrivate;
	friend class CDockWidget;
	friend class CDockAreaWidget;
    friend class CFloatingWidgetTitleBar;

private slots:
	void onDockAreasAddedOrRemoved();
	void onDockAreaCurrentChanged(int Index);

protected:
	/**
	 * Starts floating at the given global position.
	 * Use moveToGlobalPos() to move the widget to a new position
	 * depending on the start position given in Pos parameter
	 */
	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
        eDragState DragState, QWidget* MouseEventHandler) override;

	/**
	 * Call this function to start dragging the floating widget
	 */
    void startDragging(const QPoint& DragStartMousePos, const QSize& Size,
        QWidget* MouseEventHandler)
	{
        startFloating(DragStartMousePos, Size, DraggingFloatingWidget, MouseEventHandler);
	}

	/**
	 * Call this function if you explicitly want to signal that dragging has
	 * finished
	 */
	virtual void finishDragging() override;

	/**
	 * Call this function if you just want to initialize the position
	 * and size of the floating widget
	 */
	void initFloatingGeometry(const QPoint& DragStartMousePos, const QSize& Size)
	{
        startFloating(DragStartMousePos, Size, DraggingInactive, nullptr);
	}

	/**
	 * Moves the widget to a new position relative to the position given when
	 * startFloating() was called
	 */
	void moveFloating() override;

	/**
	 * 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);

	/**
	 * Call this function to update the window title
	 */
    void updateWindowTitle();

protected: // reimplements QWidget
	virtual void changeEvent(QEvent *event) override;
	virtual void closeEvent(QCloseEvent *event) override;
	virtual void hideEvent(QHideEvent *event) override;
	virtual void showEvent(QShowEvent *event) override;

#ifdef Q_OS_WIN
	/**
	 * Native event filter for handling WM_MOVING messages on Windows
	 */
	virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result) override;
#endif


public:
	using Super = QWidget;

	/**
	 * Create empty floating widget - required for restore state
	 */
	CFloatingDockContainer(CDockManager* DockManager);

	/**
	 * Create floating widget with the given dock area
	 */
	CFloatingDockContainer(CDockAreaWidget* DockArea);

	/**
	 * Create floating widget with the given dock widget
	 */
	CFloatingDockContainer(CDockWidget* DockWidget);

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

	/**
	 * Access function for the internal dock container
	 */
	CDockContainerWidget* dockContainer() const;

	/**
	 * This function returns true, if it can be closed.
	 * It can be closed, if all dock widgets in all dock areas can be closed
	 */
    bool isClosable() const;

    /**
     * This function returns true, if this floating widget has only one single
     * visible dock widget in a single visible dock area.
     * The single dock widget is a real top level floating widget because no
     * other widgets are docked.
     */
    bool hasTopLevelDockWidget() const;

    /**
     * This function returns the first dock widget in the first dock area.
     * If the function hasSingleDockWidget() returns true, then this function
     * returns this single dock widget.
     */
    CDockWidget* topLevelDockWidget() const;

    /**
     * This function returns a list of all dock widget in this floating widget.
     * This is a simple convenience function that simply calls the dockWidgets()
     * function of the internal container widget.
     */
    QList<CDockWidget*> dockWidgets() const;
}; // class FloatingDockContainer
}
 // namespace ads
//-----------------------------------------------------------------------------
#endif // FloatingDockContainerH