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lximage-qt-packaging/src/imageview.h

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/*
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 2013 <copyright holder> <email>
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 LXIMAGE_IMAGEVIEW_H
#define LXIMAGE_IMAGEVIEW_H
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsRectItem>
#include <QImage>
#include <QPixmap>
#include <QRect>
class QTimer;
namespace LxImage {
class ImageView : public QGraphicsView {
Q_OBJECT
public:
ImageView(QWidget* parent = 0);
virtual ~ImageView();
void setImage(QImage image);
QImage image() {
return image_;
}
void setScaleFactor(double scale);
double scaleFactor() {
return scaleFactor_;
}
void zoomIn();
void zoomOut();
void zoomFit();
void zoomOriginal();
bool autoZoomFit() {
return autoZoomFit_;
}
// if set to true, zoomFit() is done automatically when the size of the window is changed.
void setAutoZoomFit(bool value) {
autoZoomFit_ = value;
}
protected:
virtual void wheelEvent(QWheelEvent* event);
virtual void mouseDoubleClickEvent(QMouseEvent* event);
virtual void resizeEvent(QResizeEvent* event);
virtual void paintEvent(QPaintEvent* event);
private:
void queueGenerateCache();
QRect viewportToScene(const QRect& rect);
QRect sceneToViewport(const QRectF& rect);
private Q_SLOTS:
void generateCache();
private:
QGraphicsScene* scene_; // the topmost container of all graphic items
QGraphicsRectItem* imageItem_; // the rect item used to draw the image
QImage image_; // image to show
QPixmap cachedPixmap_; // caching of current viewport content (high quality scaled image)
QRect cachedRect_; // rectangle containing the cached region (in viewport coordinate)
QRect cachedSceneRect_; // rectangle containing the cached region (in scene/original image coordinate)
QTimer* cacheTimer_;
double scaleFactor_;
bool autoZoomFit_;
};
}
#endif // LXIMAGE_IMAGEVIEW_H