大家好，又见面了，我是你们的朋友全栈君。
We can show a image with automatic scroll bars with the use of QScrollArea.
This is a simple application with QScrollArea.
#include <QtGui/QApplication>
#include <QLabel>
#include <QScrollArea>
#include "qmlapplicationviewer.h"
Q_DECL_EXPORT int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QLabel *imageLabel = new QLabel;
QImage image(":/image.jpg");
imageLabel->setPixmap(QPixmap::fromImage(image));
QScrollArea *scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setWidget(imageLabel);
scrollArea->show();
return app.exec();
}
In addation, we can inherit from QScrollArea and then use the class we inherited as a widget which is able to scroll automatically.
Like this:
#ifndef PICWINDOW_H
#define PICWINDOW_H
#include <QScrollArea>
class QLabel;
class QImage;
class PicWindow : public QScrollArea
{
Q_OBJECT
public:
explicit PicWindow(QWidget *parent = 0);
private:
QLabel *imageLabel;
QImage *image;
signals:
public slots:
};
#endif // PICWINDOW_H
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