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ghostwindow.h
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ghostwindow.h
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/*
* Copyright (c) 2012, Daniele Esposti <expo@expobrain.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The name of the contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GHOSTWINDOW_H
#define GHOSTWINDOW_H
#include <QWidget>
class TabBar;
/*
* This widget is a static screenshot of the original tab view.
*
* It will be created during the Drag&Drop action as a visual feedback for the
* user.
*
* When moving this widget on the screen use moveWithOffest() instead of move()
* so the mouse cursor will maintain the current offset from the upper left
* corner of the window as when the D&D operation has started.
*/
class GhostWindow : public QWidget
{
Q_OBJECT
public:
// Constructor accepts the reference to the tab bar widget and the position
// of the cursor local to the tab bar itself
explicit GhostWindow(TabBar *tabbar, const QPoint& pos);
// Offset between the position of the cursor on the tab bar and the upper
// left position of the tab bar's window.
const QPoint offset() { return m_offset; }
// Index of the original tab in the tab bar
const int index() { return m_index; }
// Move the widget into the given position taking in account the current
// offset() value
void moveWithOffset(const QPoint&);
// Return True if the difference between the position of the original
// widget and given point is greater than the
// QApplication::startDragDistance() value
bool dragStarted(const QPoint&);
private:
QPoint m_offset;
int m_index;
QPoint m_originPos;
};
#endif // GHOSTWINDOW_H