3.Qt GUI中一些操作记录

一、如何在Widget中利用代码添加背景图片

1 this->setAutoFillBackground(true); //
2 QPalette palette = this->palette();
3 palette.setBrush(QPalette::Window,
4            QBrush(QPixmap(":/images/bg2.jpg").scaled(// 缩放背景图.
5                        this->size(),
6                        Qt::IgnoreAspectRatio,
7                        Qt::SmoothTransformation)));
8 this->setPalette(palette);

二、如何在QLabel中缩放图片

 1 void text::setpixmap(const QString &filename, QLabel *label)
 2 {
 3     QImage Image;
 4     Image.load(filename);
 5     QPixmap pixmap = QPixmap::fromImage(Image);
 6     int with = label->width();
 7     int height= label->height();
 8     QPixmap fitpixmap = pixmap.scaled(with,height,Qt::KeepAspectRatio,Qt::SmoothTransformation);//按比例缩放
 9 //    QPixmap fitpixmap = pixmap.scaled(with,height,Qt::IgnoreAspectRatio,Qt::SmoothTransformation);//饱满填充
10     label->setPixmap(fitpixmap);
11 }

三、