qt 中怎么在qmessagebox添加背景图片

这个简单，从QMessageBox派生一个类，

然后重载paintEvent函数，在paintEvent里面画张图片就搞定了。代码：

qpicmsgbox.h

///////////////////////////////////

#ifndef QPICMSGBOX_H

#define QPICMSGBOX_H

#include <QMessageBox>

#include <QImage>

class QPicMsgBox : public QMessageBox

{

Q_OBJECT

public:

explicit QPicMsgBox(QWidget *parent = 0)

QImage *pImage

protected:

virtual void paintEvent(QPaintEvent *paintevent)

signals:

public slots:

}

#endif // QPICMSGBOX_H

///////////////////////////////////////////////

qpicmsgbox.cpp

////////////////////////////////////////////

#include "qpicmsgbox.h"

#include <QString>

#include <QPainter>

QPicMsgBox::QPicMsgBox(QWidget *parent) :

QMessageBox(parent)

{

QString fileName = tr("7.jpg")

pImage = new QImage(fileName)

}

void QPicMsgBox::paintEvent(QPaintEvent *paintevent)

{

QPainter painter(this)

painter.drawImage(0, 0, pImage->scaled(this->size()))

QMessageBox::paintEvent(paintevent)

}

/////////////////////////////////////

//绘制的背景图就是7.jpg缩放的，和消息框一样大。

调用上面QPicMsgBox的时候就添加代码：

#include "qpicmsgbox.h"

/////////////////////

void MainWindow::on_actionMsg_triggered() ////调用图片消息对话框

{

QPicMsgBox *pMsgBox = new QPicMsgBox

pMsgBox->setWindowTitle(QString(tr("hello")))

pMsgBox->setText(QString(tr("hellogfkjdsgkldfsljgldsfgklfdkjhglkdfs")))

pMsgBox->addButton(QMessageBox::Ok)

pMsgBox->addButton(QMessageBox::Close)

pMsgBox->exec()/////////////exec是模式对话框，show是非模式的

}

void ScrollArea::set_image(char *filename)

{

QImage *ppm = new QImage(filename)

label = new QLabel()

printf("ppm->width()=%d, ppm->height()=%d\n",ppm->width(), ppm->height())//获取图片的宽度和高度

label->setPixmap(QPixmap::fromImage(*ppm))

this->setWidget(label)

/*设置窗口最大高度和宽度为1024*768*/

this->setMaximumHeight(768)

this->setMaximumWidth(1024)

this->resize(QSize( ppm->width()+5, ppm->height() +5))

return

}

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