c++ - 我怎样才能在qt中获得当前关注的QLineEdit？

Question

我如何确定哪个 QLineEdit 在 qt 中具有当前焦点？

为 QLinEdit 设置焦点我试过:

   ui->linedit->setfocus();

但它也不适合我。我该如何解决这两个问题？

Answer 1

要识别哪个焦点小部件(QlineEdit 或任何 QWidget)，您需要获取所有当前的小部件子项，将每个子项都转换为 QLineEdit，并检查哪个具有焦点，示例代码:

QList<QWidget*> mylineEdits = this->findChildren<QWidget*>();
QListIterator<QWidget*> it(mylineEdits); // iterate through the list of widgets
QWidget *lineEditField;
while (it.hasNext()) {
    lineEditField = it.next(); // take each widget in the list
    if(QLineEdit *lineE = qobject_cast<QLineEdit*>(lineEditField)) {  // check if iterated widget is of type QLineEdit
        //
        if (lineE->hasFocus())
          {
            // this has the focus ...   
          }

    }
}

第二期，关注QWidget，本期已经回答Post :