selectAll in QLineEdit does not work

[Ishmael]

I have subclassed QLineEdit in order to handle a focus event, and I would like all existing text to be highlighted as soon as I click in the textbox. The selectAll() method does not work. What am I missing?

// --------------------------------------------------------------------
class MyLineEdit : public QLineEdit
{
    Q_OBJECT
 
protected:
    void focusInEvent(QFocusEvent *);
 
};
 
void MyLineEdit::focusInEvent(QFocusEvent *e) {
 
    this->selectAll();  // THIS DOESN'T WORK
    //this->clear();  // <-- THIS WORKS!
 
}

// --------------------------------------------------------------------
class MyLineEdit : public QLineEdit
{
    Q_OBJECT

protected:
    void focusInEvent(QFocusEvent *);

};

void MyLineEdit::focusInEvent(QFocusEvent *e) {

    this->selectAll();  // THIS DOESN'T WORK
    //this->clear();  // <-- THIS WORKS!

}

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