Select text of QLineEdit on focus

Question

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.

EDIT:

In constructor:

dialog->accept(); 

and

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

Answer 1

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:

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

void focusInEvent(QFocusEvent *event) override;

Then implement it like so:

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);
}

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