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QLinearGradient linearGrad(QPointF(0, 0), QPointF(200, 200));linearGrad.setColorAt(0, Qt::blue);linearGrad.setColorAt(1, Qt::white);linearGrad.setCoordinateMode(QGradient::StretchToDeviceMode);QBrush brush(linearGrad);item1->setBackground(brush);

Qsize picSize(600,400);//將pixmap縮放成picSize大小然后保存在scaledPixmap中按比例縮放:QPixmap scaledPixmap = pixmap.scaled(picSize, Qt::KeepAspectRatio);不按照比例縮放QPixmap scaledPixmap = pixmap.scaled(picSize);

setWindowFlags(Qt::Tool | Qt::X11BypassWindowManagerHint | Qt::WindowStaysOnTopHint);

_ui->_passwordEdit->setContextMenuPolicy(Qt::NoContextMenu);//去掉右鍵菜單

QString str = "  lots\t of\nwhitespace\r\n "; str = str.trimmed(); // str == "lots\t of\nwhitespace" QString str = "  lots\t of\nwhitespace\r\n "; str = str.simplified(); // str == "lots of whitespace";

ui->_userWebConnect->setOpenExternalLinks(true);ui->_userWebConnect->setText("<a href = \"http://zkuyun.com/\>顯示的內(nèi)容</a>");

treeView->setRootIsDecorated(false);// UI控件里，在右邊的設置屬性里找到 QTreeView那欄，將rootIs Decorated 復選框，不要勾選