在焦点上选择 QLineEdit 的文本 [英] Select text of QLineEdit on focus

问题描述

我使用 QtDesigner 创建了一个对话框.对话框中有一个带有一些默认内容的 QLineEdit 对象.当对话框初始化并且焦点转到 QLineEdit 时，我希望自动选择默认内容，因此一旦用户开始编写，之前的内容将被覆盖.

I have created a dialog using QtDesigner. There is a QLineEdit object in the dialog with some default content. When the dialog initializes and the focus goes to the QLineEdit, I want the default content to be auto selected, so once the user start writing, the previous content will be overwritten.

在构造函数中:

dialog->accept(); 

和

connect( dialog, SIGNAL(accepted()), QlineObj, SLOT( selectAll() ) );

推荐答案

这是一个较旧的问题，但尽管如此，我最终还是在这里寻找解决方案.可以通过以下方式解决:

This is an older question, but nevertheless, I ended up here searching for a solution this exact problem. It can be solved in the following way:

创建一个派生自 QLineEdit 的类并覆盖头部中的 focusInEvent:

Create a class derived from QLineEdit and override the focusInEvent in the header:

virtual void focusInEvent(QFocusEvent *event) override;

然后像这样实现它:

void MyLineEdit::focusInEvent(QFocusEvent *event)
{
    // First let the base class process the event
    QLineEdit::focusInEvent(event);
    // Then select the text by a single shot timer, so that everything will
    // be processed before (calling selectAll() directly won't work)
    QTimer::singleShot(0, this, &QLineEdit::selectAll);
}

以防万一其他人想知道如何做到这一点;-)

Just in case anybody else wonders how this can be done ;-)

这篇关于在焦点上选择 QLineEdit 的文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！