Qt小例子学习53 - 使用resizeEvent调整窗口大小时调整Qlabel的图像大小
testsize.h
#ifndef TESTSIZE_H
#define TESTSIZE_H
#include <QWidget>
class QLabel;
class testsize : public QWidget {
Q_OBJECT
public:
explicit testsize(QWidget *parent = 0);
~testsize();
private:
QLabel *image;
QPixmap original_px;
protected:
void resizeEvent(QResizeEvent *event);
};
#endif // TESTSIZE_H
testsize.cpp
#include "testsize.h"
#include <QLabel>
#include <QResizeEvent>
#include <QVBoxLayout>
testsize::testsize(QWidget *parent) : QWidget(parent)
{
image = new QLabel(this);
original_px = QPixmap(":/wallpaper.jpg");
image->setPixmap(original_px);
resize(640, 480);
}
testsize::~testsize() {}
void testsize::resizeEvent(QResizeEvent *event)
{
QPixmap px = original_px.scaled(event->size());
image->setPixmap(px);
image->resize(event->size());
QWidget::resizeEvent(event);
}
main.cpp
#include "testsize.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
testsize w;
w.show();
return a.exec();
}
