HOWTO: make a QLineEdit select all the text when clicked on?

[scarleton]

On both the QEvent::Enter and QEvent::FocusIn of the QLineEdit, I am calling selectAll(), but it isn't working as desired...

Everything gets selected ( because of QEvent::FocusIn, I think), but on the mouse down or something the selectAll is lost.

Any thoughts on how to safely do a selectAll so I can simply type over the existing value?

[tbscope]

connect(this, SIGNAL(clicked()), this, SLOT(selectAll()));

connect(this, SIGNAL(clicked()), this, SLOT(selectAll()));

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[aamer4yu]

Does QLineEdit have a clicked() signal

[tbscope]

Apparently no :-)
Monday morning I guess. I assumed all widgets had a clicked signal. Why don't they?

Anyway, here's the signal:

class MyLineEdit : public QLineEdit
{
...
signals:
    void clicked();
...
};
 
// Edit: or mouseReleaseEvent(...) according to your taste
void MyLineEdit::mousePressEvent(...)
{
    emit clicked();
}

class MyLineEdit : public QLineEdit
{
...
signals:
    void clicked();
...
};

// Edit: or mouseReleaseEvent(...) according to your taste
void MyLineEdit::mousePressEvent(...)
{
    emit clicked();
}

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I think, but I guess I need to get some more cafeine to wake up.

[wysota]

but on the mouse down or something the selectAll is lost.

To prevent such behaviour, you'd have to filter out all unwanted events. But then you won't be able to do things as selecting parts of the input from the widget with the mouse and stuff. I think that what you really want is something like this:

class MagicLineEdit : public QLineEdit {
public:
  MagicLineEdit(QWidget *parent = 0) : QLineEdit(parent), m_firstChar(false) {}
protected:
  void focusInEvent(QFocusEvent *e) {
    m_firstChar = true;
    QLineEdit::focusInEvent(e);
  }
  void keyPressEvent(QKeyEvent *ke) {
    if(m_firstChar /* && !ke->text().isEmpty() */) { // the commented part is optional
      clear();
      m_firstChar = false;
    }
    QLineEdit::keyPressEvent(ke);
  }
private:
  bool m_firstChar;
};

class MagicLineEdit : public QLineEdit {
public:
  MagicLineEdit(QWidget *parent = 0) : QLineEdit(parent), m_firstChar(false) {}
protected:
  void focusInEvent(QFocusEvent *e) {
    m_firstChar = true;
    QLineEdit::focusInEvent(e);
  }
  void keyPressEvent(QKeyEvent *ke) {
    if(m_firstChar /* && !ke->text().isEmpty() */) { // the commented part is optional
      clear();
      m_firstChar = false;
    }
    QLineEdit::keyPressEvent(ke);
  }
private:
  bool m_firstChar;
};

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