tabbar.h

/*
 * 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 VIEWBAR_H
#define VIEWBAR_H

#include <QTabBar>


class GhostWindow;


class TabbedWindow;


/*
 * Re-implemented the standard QTabBar widget but adds new methods to allow
 * Drag&Drop operations outside the tab bar's window, like creating a new
 * window with a dragged view, move a view into a different window or close the
 * current window if no more tabs are available
 */
class TabBar : public QTabBar
{
    Q_OBJECT

public:
    TabBar(QWidget *parent = 0);
    ~TabBar();

    // If the left mouse button if pressed over a tab show the ghost window
    // and starts the Drag&Drop operation
    void mousePressEvent(QMouseEvent *);

    // Update the ghost window's position during mouse move
    void mouseMoveEvent(QMouseEvent *);

    // Drops the current dragged view and creates a new window if no tab bar
    // under the event's screen position otherwise move the dragged view into
    // the tab bar under the mouse event's position.
    // Finishing by destroying the ghost windows widget and closing the current
    // window if no tabs left.
    void mouseReleaseEvent(QMouseEvent *);

protected:
    // Creates a new window fetching geometry information from the given
    // GhostWindow instance and moving the view at the index referenced by
    // GhostWindow::index() into the newly created window
    void createNewWindow(GhostWindow*);

    // Move the view at the index referenced by the GhostWindow::index()
    // attribute into the given tabbed windows and at the given current
    // position.
    void moveToWindow(TabbedWindow*, const QPoint&, GhostWindow*);

    // If no tabs are left in the current tab bar closes the widget's window.
    //
    // See QTabBar::tabRemoved
    void tabRemoved(int index);

private:
    GhostWindow *m_ghost;
};

#endif // VIEWBAR_H