Qt QLineEdit 漂亮的搜索框 && 密码模式 && 格式化输入 && 提示文字 && 选择内容并移动 && 清除全部输入

//实现代码
void MainWindow::iniLineEdit()
{
　　ui->lineEdit->setPlaceHolderText(QObject::tr("搜索文本));
    QAction * contentAct = new QAction(this);
    contentAct->setIcon(QIcon(":/image/文本.png"));
    ui->lineEdit->addAction(contentAct, QLineEdit::LeadingPosition);

    QAction * operateAct = ui->lineEdit->addAction(QIcon(":/image/搜索.png"), QLineEdit::TrailingPosition);
    connect(operateAct, SIGNAL(triggered(bool)), this, SLOT(slotOperateActTrigged()));

}

void MainWindow::slotOperateActTrigged()
{
    ui->label->setText(QObject::tr("you search content is %1").arg(ui->lineEdit->text()));
}

//类似于mysql输入密码效果
ui->lineEdit->setEchoMode(QLineEdit::NoEcho);
//ui->label->setText(QObject::tr("you have input %1").arg(ui->lineEdit->text())); 这种方式取不到lineEdit里面的内容
connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SLOT(slotLineEditTextChanged(QString)));
void MainWindow::slotLineEditTextChanged(QString text)
{
    ui->label->setText(QObject::tr("you have input %1").arg(text));
}

//密码小黑圆圈效果
ui->lineEdit->setEchoMode(QLineEdit::Password);
connect(ui->lineEdit, SIGNAL(editingFinished()), this, SLOT(slotLineEditEditingFinished()));
void MainWindow::slotLineEditEditingFinished()
{
    ui->label->setText(QObject::tr("you have input %1").arg(ui->lineEdit->text()));
}

//输入时正常显示，失去焦点时，显示为小黑圆圈
ui->lineEdit->setEchoMode(QLineEdit::PasswordEchoOnEdit);

ui->lineEdit->setPlaceholderText(QObject::tr("你好..."));

ui->lineEdit->setInputMask("000.000.000.000");
ui->lineEdit->setInputMask("000.000.000.000;$");

    ui->lineEdit->setPlaceholderText(QObject::tr("搜索文本"));
    ui->lineEdit->setClearButtonEnabled(true); //清除全部输入
    ui->lineEdit->setDragEnabled(true);//移动选择内容