Qt杂项设置(QLabel超链接、图片缩放、窗口不在任务栏显示并置顶等)

1.使用代码设置渐变

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);

2.QPixmap图片的缩放

Qsize picSize(600,400);
//将pixmap缩放成picSize大小然后保存在scaledPixmap中
按比例缩放:
QPixmap scaledPixmap = pixmap.scaled(picSize, Qt::KeepAspectRatio);
不按照比例缩放
QPixmap scaledPixmap = pixmap.scaled(picSize);

3.设置窗口不在任务栏显示并置顶

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

4.QLineEdit去掉右键菜单

_ui->_passwordEdit->setContextMenuPolicy(Qt::NoContextMenu);//去掉右键菜单

5.去除QString中的空格

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";

6.QLabel实现超链接

ui->_userWebConnect->setOpenExternalLinks(true);
ui->_userWebConnect->setText("<a href = \"http://zkuyun.com/\>显示的内容</a>");

 7.QTreeView去掉父节点的下拉

treeView->setRootIsDecorated(false);

// UI控件里，在右边的设置属性里找到 QTreeView那栏，将rootIs Decorated 复选框，不要勾选