QT---lineEdit相关信号

1.returnPressed信号

connect(ui.lineEdit_passWord, &QLineEdit::returnPressed, [=]() {  // 输入密码回车后，调用校验密码接口
    ui.lineEdit_passWord->clearFocus(); //失去焦点
    on_param_confirmBtn_clicked();
    });

2.输入后失去焦点才获取编辑框内新信息
参考https://blog.csdn.net/strive_spirit/article/details/123423353

ui.stackedWidget->setFocusPolicy(Qt::ClickFocus); // 给lineedit控件父窗体设置焦点策略，一点击空白位置，焦点就会从lineEdit移开
ui.test_lineEdit_mTarget->installEventFilter(this); // 注册给要监控焦点的控件注册事件


// FocusOut 焦点离开 FocusIn焦点来
bool ClearCorner::eventFilter(QObject* watched, QEvent* event) {  
    // todo 获取修改的信息并写入PLC中
    if (watched == ui.test_lineEdit_mTarget && event->type() == QEvent::FocusOut)
    {
        outPutMsg(QtDebugMsg, "ClearCorner::eventFilter test_lineEdit_mTarget event->type() = " + QString::number(event->type(), 10));
        ui.test_lineEdit_mTarget->clearFocus();
        ui.test_lineEdit_mTarget->text();
        // todo
    }
    else if (watched == ui.test_lineEdit_sectionBarHeight && event->type() == QEvent::FocusOut)
    {
        outPutMsg(QtDebugMsg, "ClearCorner::eventFilter  test_lineEdit_sectionBarHeight event->type() = " + QString::number(event->type(), 10));
        ui.test_lineEdit_sectionBarHeight->clearFocus();
        ui.test_lineEdit_sectionBarHeight->text();
        // todo
    }
    else if (watched == ui.test_lineEdit_sectionBarWidth && event->type() == QEvent::FocusOut)
    {
        outPutMsg(QtDebugMsg, "ClearCorner::eventFilter test_lineEdit_sectionBarWidth event->type() = " + QString::number(event->type(), 10));
        ui.test_lineEdit_sectionBarWidth->clearFocus();
        ui.test_lineEdit_sectionBarWidth->text();
        // todo 
    }
    else if (watched == ui.test_lineEdit_formWidth && event->type() == QEvent::FocusOut)
    {
        outPutMsg(QtDebugMsg, "ClearCorner::eventFilter test_lineEdit_formWidth event->type() = " + QString::number(event->type(), 10));
        ui.test_lineEdit_formWidth->clearFocus();
        ui.test_lineEdit_formWidth->text();
        // todo 
    }
    else if (watched == ui.test_lineEdit_formLen && event->type() == QEvent::FocusOut)
    {
        outPutMsg(QtDebugMsg, "ClearCorner::eventFilter test_lineEdit_formLen event->type() = " + QString::number(event->type(), 10));
        ui.test_lineEdit_formLen->clearFocus();
        ui.test_lineEdit_formLen->text();
        // todo
    }

    return QObject::eventFilter(watched, event);
}

3.textChanged信号 --个人不推荐，只要有变化就会触发，可能会有不停发然后卡死情况

connect(ui.auto_lineEdit_workTotal, &QLineEdit::textChanged, this, &WeldTool::onAutoWorkTotalTextChanged);