EditorPartArea.h

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/*
 * Copyright (C) 2012 by
 *   MetraLabs GmbH (MLAB), GERMANY
 * and
 *   Neuroinformatics and Cognitive Robotics Labs (NICR) at TU Ilmenau, GERMANY
 * All rights reserved.
 *
 * Contact: info@mira-project.org
 *
 * Commercial Usage:
 *   Licensees holding valid commercial licenses may use this file in
 *   accordance with the commercial license agreement provided with the
 *   software or, alternatively, in accordance with the terms contained in
 *   a written agreement between you and MLAB or NICR.
 *
 * GNU General Public License Usage:
 *   Alternatively, this file may be used under the terms of the GNU
 *   General Public License version 3.0 as published by the Free Software
 *   Foundation and appearing in the file LICENSE.GPL3 included in the
 *   packaging of this file. Please review the following information to
 *   ensure the GNU General Public License version 3.0 requirements will be
 *   met: http://www.gnu.org/copyleft/gpl.html.
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 * IN NO EVENT SHALL "MLAB" OR "NICR" BE LIABLE TO ANY PARTY FOR DIRECT,
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 */

#ifndef MIRA_EDITORPARTAREA_H_
#define MIRA_EDITORPARTAREA_H_

#include <set>
#include <iostream>

#include <QWidget>
#include <QTabBar>
#include <QMouseEvent>

namespace mira {


class EditorPartWindow;
class EditorPartAreaTabBar; // declared below in this file


class EditorPartArea : public QWidget
{
    Q_OBJECT
public:

    EditorPartArea(QWidget* parent=0, Qt::WindowFlags flags=Qt::WindowFlags()) ;

public:

    virtual void addSubWindow(EditorPartWindow* window);
    void removeSubWindow(EditorPartWindow* window);

    void activateSubWindow(EditorPartWindow* window);
    EditorPartWindow* activeSubWindow () const;

    void scrollToSubWindow(EditorPartWindow* window);

signals:

    void editorWindowActivated(EditorPartWindow* window);

public slots:

    void tileSubWindows();

public:

    void setBackground(const QBrush& brush);

    void setAutoHideDecorations(bool on);

public:

    virtual bool eventFilter(QObject* object, QEvent* event);
    virtual void resizeEvent(QResizeEvent* event);

public:

    std::vector<EditorPartWindow*> getTabbedWindows();

protected:

    friend class EditorPartWindow;

    // to be called by EditorPartWindows
    void dockSubwindow(EditorPartWindow* window); // called by subwindow to dock back
    void undockSubwindow(EditorPartWindow* window); // called by subwindow to undock
    void maximizedSubwindow(EditorPartWindow* window); // called by subwindow when it was maximized
    void restoredSubwindow(EditorPartWindow* window); // called by subwindow when it was restored

    // must be called if area was resized, scrolled, or window was newly maximized
    void rearrangeMaximizedSubwindow(EditorPartWindow* window);

    void resizeMaximizedSubwindows(const QSize& size);
    void rearrangeMaximizedSubwindows();
    void updateMaximizedSubwindowsVisibility();

    void scrolledAreaBy(int dx, int dy);

    std::set<EditorPartWindow*> getSubWindows();

protected slots:

    void onFocusChanged(QWidget *old, QWidget *now);

    void onTabChanged(int);
    void onTabDoubleClicked(int);

private:

    void addWindowTab(EditorPartWindow* window);
    void removeWindowTab(EditorPartWindow* window);
    int  findWindowTab(EditorPartWindow* window) const;

    void internalRaise(EditorPartWindow* window) const;

private:

    class ScrollArea;
    friend class ScrollArea;
    ScrollArea* mArea;

    EditorPartAreaTabBar* mTabBar;

    std::set<EditorPartWindow*> mSubWindows;
    std::set<EditorPartWindow*> mDockedSubWindows;

    EditorPartWindow* mActiveSubWindow;

    bool mAutoHideDecorations;
};


class EditorPartAreaTabBar : public QTabBar
{
    Q_OBJECT
public:

    EditorPartAreaTabBar (QWidget* parent) : QTabBar(parent) {
        setAcceptDrops(true);
    }

signals:

    void tabDoubleClicked(int index);
    void tabContextMenu(int index, QPoint globalPos);

protected:

    void dragEnterEvent(QDragEnterEvent* event)
    {
        event->acceptProposedAction();
    }

    void dragMoveEvent(QDragMoveEvent* event)
    {
        int tab = tabAt(event->pos());
        if(tab>=0 && tab!=currentIndex())
            setCurrentIndex(tab);
        event->ignore();
    }

    virtual void mouseDoubleClickEvent(QMouseEvent* e)
    {
        QTabBar::mouseDoubleClickEvent(e);

        if(e->button()==Qt::LeftButton)
            emit tabDoubleClicked(currentIndex());
    }

    virtual void contextMenuEvent(QContextMenuEvent* e)
    {
        emit tabContextMenu(tabAt(e->pos()), e->globalPos());
    }
};

}

#endif