qgsscrollarea.h

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/***************************************************************************
    qgsscrollarea.h
    ---------------
    begin                : March 2017
    copyright            : (C) 2017 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSSCROLLAREA_H
#define QGSSCROLLAREA_H

#include <QScrollArea>
#include "qgis_sip.h"
#include "qgis_gui.h"
#include <QTimer>
class ScrollAreaFilter;

class GUI_EXPORT QgsScrollArea : public QScrollArea
{
    Q_OBJECT

  public:

    explicit QgsScrollArea( QWidget *parent SIP_TRANSFERTHIS = nullptr );

    void scrollOccurred();

    bool hasScrolled() const;

  protected:
    void wheelEvent( QWheelEvent *event ) override;

  private:
    QTimer mTimer;
    ScrollAreaFilter *mFilter = nullptr;
};

#ifndef SIP_RUN


class ScrollAreaFilter : public QObject
{
    Q_OBJECT
  public:

    ScrollAreaFilter( QgsScrollArea *parent = nullptr,
                      QWidget *viewPort = nullptr );

  protected:
    bool eventFilter( QObject *obj, QEvent *event ) override;

  private:
    QgsScrollArea *mScrollAreaWidget = nullptr;
    QWidget *mViewPort = nullptr;

    void addChild( QObject *child );
    void removeChild( QObject *child );

};


#endif

#endif // QGSSCROLLAREA_H