/*************************************************************************
 * Copyright (C) 2014 by Hugo Pereira Da Costa <hugo.pereira@free.fr>    *
 *                                                                       *
 * This program 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 2 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * This program 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 for more details.                          *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program; if not, write to the                         *
 * Free Software Foundation, Inc.,                                       *
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
 *************************************************************************/

#ifndef ADWAITA_SPLITTER_PROXY_H
#define ADWAITA_SPLITTER_PROXY_H

#include "adwaita.h"
#include "adwaitaaddeventfilter.h"

#include <QEvent>
#include <QHoverEvent>
#include <QMainWindow>
#include <QMap>
#include <QMouseEvent>
#include <QSplitterHandle>
#include <QWidget>

namespace Adwaita
{
class SplitterProxy;

//* factory
class ADWAITAQT_EXPORT SplitterFactory : public QObject
{
    Q_OBJECT

public:
    //* constructor
    explicit SplitterFactory(QObject *parent)
        : QObject(parent)
        , _enabled(false)
    {
    }

    //* destructor
    virtual ~SplitterFactory()
    {
    }

    //* enabled state
    void setEnabled(bool);

    //* register widget
    bool registerWidget(QWidget *);

    //* unregister widget
    void unregisterWidget(QWidget *);

private:
    //* enabled state
    bool _enabled;

    //* needed to block ChildAdded events when creating proxy
    AddEventFilter _addEventFilter;

    //* pointer to SplitterProxy
    using SplitterProxyPointer = WeakPointer<SplitterProxy>;

    //* registered widgets
    using WidgetMap = QMap<QWidget *, SplitterProxyPointer>;
    WidgetMap _widgets;
};

//* splitter 'proxy' widget, with extended hit area
class SplitterProxy : public QWidget
{
    Q_OBJECT

public:
    //* constructor
    explicit SplitterProxy(QWidget *, bool = false);

    //* destructor
    virtual ~SplitterProxy();

    //* event filter
    virtual bool eventFilter(QObject *, QEvent *);

    //* enable state
    void setEnabled(bool);

    //* enable state
    bool enabled() const
    {
        return _enabled;
    }

protected:
    //* event handler
    virtual bool event(QEvent *);

protected:
    //* reset 'true' splitter widget
    void clearSplitter();

    //* keep track of 'true' splitter widget
    void setSplitter(QWidget *);

private:
    //* enabled state
    bool _enabled;

    //* splitter object
    WeakPointer<QWidget> _splitter;

    //* hook
    QPoint _hook;

    //* timer id
    int _timerId;
};

} // namespace Adwaita

#endif // ADWAITA_SPLITTER_PROXY_H