QT设置MessageBox的大小

一、重载resizeEvent

1、添加mymessagebox.cpp文件

#include "mymessagebox.h"

MyMessageBox::MyMessageBox(QWidget *parent) :
    QMessageBox(parent),
    _width(0),
    _height(0)
{
}

void MyMessageBox::setMySize(int width, int height)
{
    _width = width;
    _height = height;
}

void MyMessageBox::resizeEvent(QResizeEvent *event)
{
    setFixedSize(_width, _height);
}

2、添加mymessagebox.h文件

#ifndef MYMESSAGEBOX_H
#define MYMESSAGEBOX_H

#include <QWidget>
#include <QMessageBox>
#include <QResizeEvent>

class MyMessageBox : public QMessageBox
{
    Q_OBJECT
public:
    explicit MyMessageBox(QWidget *parent = 0);
    void setMySize(int width, int height);

signals:
    
public slots:

protected:
    void resizeEvent(QResizeEvent *event);

private:
    int _width;
    int _height;
};

#endif // MYMESSAGEBOX_H

3、在需要弹出MessageBox的地方添加代码

    MyMessageBox msgBox;
    msgBox.setMySize(640,480);//设置MessageBox的大小
    msgBox.setStyleSheet("background-image:url(:/new/two/two_1.jpeg)");//显示图片
    msgBox.exec();//执行改变