如何在Qt中获得当前关注的QLineEdit?

问题描述

如何确定qt当前焦点在哪个QLineEdit?

How can I identify which QLineEdit has the current focus in qt?

要为QLinEdit设置焦点，我已经尝试过:

To set the focus for QLinEdit I have tried:

   ui->linedit->setfocus();

但它对我也不起作用.我该如何解决这两个问题?

but it also not working for me. How can I solve these two?

推荐答案

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级，将每个子级转换为QLineEdit，并检查哪个子级具有焦点，示例代码:

To identify which focused Widget (QlineEdit or any QWidget), you need to get all your current widget children, cast each to QLineEdit, and check which one has focus, sample code:

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 ...   
          }

    }
}

第二个问题，将重点放在QWidget上，已经在此帖子中得到了回答:

Second issue, setting focus on QWidget, already answered in this Post:

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