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50
51#ifndef IMAGEWIDGET_H
52#define IMAGEWIDGET_H
53
54#include <QImage>
55#include <QLoggingCategory>
56#include <QWidget>
57
58QT_BEGIN_NAMESPACE
59class QGestureEvent;
60class QPanGesture;
61class QPinchGesture;
62class QSwipeGesture;
63QT_END_NAMESPACE
64
65Q_DECLARE_LOGGING_CATEGORY(lcExample)
66
67//! [class definition begin]
68class ImageWidget : public QWidget
69{
70 Q_OBJECT
71
72public:
73 ImageWidget(QWidget *parent = nullptr);
74 void openDirectory(const QString &path);
75 void grabGestures(const QVector<Qt::GestureType> &gestures);
76
77protected:
78 bool event(QEvent *event) override;
79 void paintEvent(QPaintEvent *event) override;
80 void resizeEvent(QResizeEvent *event) override;
81 void mouseDoubleClickEvent(QMouseEvent *event) override;
82
83private:
84 bool gestureEvent(QGestureEvent *event);
85 void panTriggered(QPanGesture*);
86 void pinchTriggered(QPinchGesture*);
87 void swipeTriggered(QSwipeGesture*);
88//! [class definition begin]
89
90 QImage loadImage(const QString &fileName) const;
91 void loadImage();
92 void goNextImage();
93 void goPrevImage();
94 void goToImage(int index);
95
96 QString path;
97 QStringList files;
98 int position;
99
100 QImage prevImage, nextImage;
101 QImage currentImage;
102
103 qreal horizontalOffset;
104 qreal verticalOffset;
105 qreal rotationAngle;
106 qreal scaleFactor;
107 qreal currentStepScaleFactor;
108//! [class definition end]
109};
110//! [class definition end]
111
112#endif
113

source code of qtbase/examples/widgets/gestures/imagegestures/imagewidget.h