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/***************************************************************************
* Copyright (C) 2006 by Peter Penz <[email protected]> *
* *
* 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 PIXMAPVIEWER_H
#define PIXMAPVIEWER_H
#include <QPixmap>
#include <QQueue>
#include <QTimeLine>
#include <QWidget>
class QPaintEvent;
/**
* @brief Widget which shows a pixmap centered inside the boundaries.
*
* When the pixmap is changed, a smooth transition is done from the old pixmap
* to the new pixmap.
*/
class PixmapViewer : public QWidget
{
Q_OBJECT
public:
enum Transition
{
/** No transition is done when the pixmap is changed. */
NoTransition,
/**
* The old pixmap is replaced by the new pixmap and the size is
* adjusted smoothly to the size of the new pixmap.
*/
DefaultTransition,
/**
* If the old pixmap and the new pixmap have the same content, but
* a different size it is recommended to use Transition::SizeTransition
* instead of Transition::DefaultTransition. In this case it is assured
* that the larger pixmap is used for downscaling, which leads
* to an improved scaling output.
*/
SizeTransition
};
explicit PixmapViewer(QWidget* parent,
Transition transition = DefaultTransition);
~PixmapViewer() override;
void setPixmap(const QPixmap& pixmap);
QPixmap pixmap() const;
/**
* Sets the size hint to \a size and triggers a relayout
* of the parent widget. Per default no size hint is given.
*/
void setSizeHint(const QSize& size);
QSize sizeHint() const override;
protected:
void paintEvent(QPaintEvent* event) override;
private Q_SLOTS:
void checkPendingPixmaps();
private:
QPixmap m_pixmap;
QPixmap m_oldPixmap;
QQueue<QPixmap> m_pendingPixmaps;
QTimeLine m_animation;
Transition m_transition;
int m_animationStep;
QSize m_sizeHint;
};
inline QPixmap PixmapViewer::pixmap() const
{
return m_pixmap;
}
#endif
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