QLineEdit selectAll() in eventFilter

[mclark]

I'm having trouble selecting all the text in a QLineEdit control inside an eventFilter.

In a QDialog, I want to select all text in a QLineEdit control when a user tabs into it. My eventFilter recognizes the control but doesn't select.

bool AddMainPage::eventFilter( QObject* pObj, QEvent* pEvent )
{
    if ( pEvent->type() == QEvent::FocusIn )
    {
        if ( pObj == ui.ipAddrEdt )  // ipAddrEdt has focus at this point
        {
            ui.ipAddrEdt->selectAll();
            ui.ipAddrEdt->setCursorPosition( 0 );
            return true;
        }
    ...

bool AddMainPage::eventFilter( QObject* pObj, QEvent* pEvent )
{
    if ( pEvent->type() == QEvent::FocusIn )
    {
        if ( pObj == ui.ipAddrEdt )  // ipAddrEdt has focus at this point
        {
            ui.ipAddrEdt->selectAll();
            ui.ipAddrEdt->setCursorPosition( 0 );
            return true;
        }
    ...

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I'm not sure that I'm going about this in the correct way either. I don't want to selectAll() when the user uses the mouse to click into the control, only when it's tabbed into. I know that I'm dealing with 2 different events here; QEvent::FocusIn and QEvent::KeyPress.

Does anyone have any suggestions on how best to handle this situation?

[jpn]

QFocusEvent* pFocusEvent = static_cast<QFocusEvent*>(pEvent);
if (pFocusEvent->reason() == Qt::TabFocusReason)
{
    ...
}

QFocusEvent* pFocusEvent = static_cast<QFocusEvent*>(pEvent);
if (pFocusEvent->reason() == Qt::TabFocusReason)
{
    ...
}

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[mclark]

Thanks jpn, that solves the design problem, now, does anyone know why the selectAll() does not select anything in my QLineEdit object?

It should be noted that I have an input mask on this object like: 000.000.000.000, a standard 4 segment IP address. What is displayed in the control is "0 .0 .0 .0 ". If I don't use the eventFilter, the first character is selected when the control is tabbed into. If using the eventFilter, no selection occurs .

[jpn]

I'm afraid QLineEdit::setCursorPos(0) clears the selection.

[mclark]

Good catch jpn, I was hoping it would be a foolish mistake on my part that someone would notice. I works just like I want now. Thanks!

[ironstorm]

Thanks jpn, that solves the design problem, now, does anyone know why the selectAll() does not select anything in my QLineEdit object?
....
If using the eventFilter, no selection occurs .

Did you ever figure out how to make this work?

I just set up an eventFilter, but selectAll() doesn't work... clear() does, as does changing the color... so I know I'm catching the event and object... but selectAll() doesn't do anything.

bool Track::eventFilter(QObject *obj, QEvent *e) {
  // qDebug() << "Track::eventFilter: Received event '" << e->type() << "' from object '" << obj->name() << "'.";
 
  if (obj == m_pView->m_pLineEditSearch && e->type()==QEvent::FocusIn) {
    qDebug("QEvent::FocusIn event intercepted");
    ((QLineEdit *)obj)->selectAll();
    // ((QLineEdit *)obj)->clear();
    return false;
  } else if (obj == m_pView->m_pLineEditSearch && e->type()==QEvent::FocusOut) {
    qDebug("QEvent::FocusOut event intercepted");
    return false;
  }
// else {
    // standard event processing
    // return QObject::eventFilter(obj, event);
//  }
    return false;
}

bool Track::eventFilter(QObject *obj, QEvent *e) {
  // qDebug() << "Track::eventFilter: Received event '" << e->type() << "' from object '" << obj->name() << "'.";

  if (obj == m_pView->m_pLineEditSearch && e->type()==QEvent::FocusIn) {
    qDebug("QEvent::FocusIn event intercepted");
    ((QLineEdit *)obj)->selectAll();
    // ((QLineEdit *)obj)->clear();
    return false;
  } else if (obj == m_pView->m_pLineEditSearch && e->type()==QEvent::FocusOut) {
    qDebug("QEvent::FocusOut event intercepted");
    return false;
  }
// else {
    // standard event processing
    // return QObject::eventFilter(obj, event);
//  }
    return false;
}

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[ironstorm]

seems the solution is to eat MouseButtonPress and MouseButtonRelease events...

bool Track::eventFilter(QObject *obj, QEvent *e) {
  if (obj == m_pView->m_pLineEditSearch) {
    // qDebug() << "Track::eventFilter: Received event '" << e->type() << "' from object '" << obj->name() << "'.";
    if (e->type()==QEvent::FocusIn) {
      // qDebug("QEvent::FocusIn event intercepted");
      ((QLineEdit *)obj)->selectAll();
      // qDebug() << "hasSelectedText? " << ((QLineEdit *)obj)->hasSelectedText();
      // qDebug() << "So the selected text is now: " << ((QLineEdit *)obj)->selectedText();
    } else if (e->type()==QEvent::MouseButtonPress || e->type()==QEvent::MouseButtonRelease) { // Drop entry events which deselect the text
      // qDebug("Drop mouse event.");
      return true;
    }
  }
  return false;
}

bool Track::eventFilter(QObject *obj, QEvent *e) {
  if (obj == m_pView->m_pLineEditSearch) {
    // qDebug() << "Track::eventFilter: Received event '" << e->type() << "' from object '" << obj->name() << "'.";
    if (e->type()==QEvent::FocusIn) {
      // qDebug("QEvent::FocusIn event intercepted");
      ((QLineEdit *)obj)->selectAll();
      // qDebug() << "hasSelectedText? " << ((QLineEdit *)obj)->hasSelectedText();
      // qDebug() << "So the selected text is now: " << ((QLineEdit *)obj)->selectedText();
    } else if (e->type()==QEvent::MouseButtonPress || e->type()==QEvent::MouseButtonRelease) { // Drop entry events which deselect the text
      // qDebug("Drop mouse event.");
      return true;
    }
  }
  return false;
}

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