//##################################################################################################
//
//   Custom Visualization Core library
//   Copyright (C) 2011-2012 Ceetron AS
//    
//   This library is free software: you can redistribute it and/or modify 
//   it under the terms of the GNU General Public License as published by 
//   the Free Software Foundation, either version 3 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 General Public License at <<http://www.gnu.org/licenses/gpl.html>> 
//   for more details. 
//
//##################################################################################################

#pragma once

class QMouseEvent;
class QGraphicsSceneMouseEvent;

#include <Qt>

namespace cvfqt {

//==================================================================================================
//
// Helper class for storing mouse positions and button states. Should be reset whenever widget looses focus.
//
//==================================================================================================
class MouseState
{
public:
    MouseState();

    void                    updateFromMouseEvent(QMouseEvent* event);
    void                    updateFromMouseEvent(QGraphicsSceneMouseEvent* event);
    void                    reset();

    Qt::MouseButtons        mouseButtonState() const;
    Qt::KeyboardModifiers   keyboardModifierFlags() const;
    Qt::MouseButton         cleanButtonClickButton() const;

public:
    static int              numMouseButtonsInState(Qt::MouseButtons buttonState);

private:
    Qt::MouseButtons        m_mouseButtonState;            // Stores current mouse button state (combination of mouse buttons that are down)
    Qt::KeyboardModifiers   m_keyboardModifierFlags;       // Stores current keyboard modifier flags (combination of keyboard modifier keys that are down)

    int                     m_cleanButtonClickTolerance;   // The movement tolerance in pixels for considering a mouse button press/release sequence a clean button click
    Qt::MouseButton         m_cleanButtonPressButton;      // The mouse button that was last pressed 'cleanly', that is without any other mouse buttons down. Used to detect clean button clicks (for showing context menus etc)
    int                     m_cleanButtonPressPosX;        // The position of the mouse cursor in widget coordinates of the last clean button press. Used to check if cursor has moved when button is released
    int                     m_cleanButtonPressPosY;        //
    Qt::MouseButton         m_cleanButtonClickButton;      // The button (if any) that was last clicked 'cleanly'.

};

}

