Telling apart single click and double click in QTableView

Hi,

I'm using a QTableView (cannot change to QTableWidget) and need a Delegate (not an editor) to do different actions on single and double mouse clicks. The basic idea I came up with is to start a QTimer on a QEvent::MouseButtonRelease and either stop it on receiving a QEvent::MouseButtonDblClick and depending on the program state maybe open a new QWindow or if no double click event is received to change something on the delegate.

The other QWindow is started through the doubleClicked signal in a controller class:

Code:

---

connect(m_table, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(maybeOpenQWindow(QModelIndex)));

---

This is my Delegate's event handling:

Code:

---

bool MyDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
  if (QEvent::MouseButtonRelease)
  {
    qDebug() << "single click";
    m_timer->start();
    event->accept();
    return true;
  }
  else if (event->type() == QEvent::MouseButtonDblClick)
  {
    qDebug() << "double click";
    m_timer->stop();
    event->accept();
    return true;
  }
  else
  {
    return false;
  }
}

---

I saw in the source code, that QAbstractItemView::mouseDoubleClickEvent is sending out a mouse press event like QWidget::mouseDoubleClickEvent so I overloaded it with an empty function in my QTableView and verified it isn't run.

But I get mixed results.

Double click on MyDelegate while it is focused and no new QWindow is started:

Code:

---

single click
double click
single click

---

Where do I get the excess single click event from?
(in this case my timer is started again and the undesired single click action is executed, but a double click should be ignored if no new QWindow is started)

Double click on MyDelegate while it is focused and a new QWindow is started:

Code:

---

single click
double click

---

Why do those situations behave differently?

To sum it up:
I need my delegate to
* always react on a single click (i.e. repaint differently)
* either start a new QWindow or ignore a double click, depending on programs state

Any suggestions how I can achieve this? Completely different approaches are welcome as well.

Cheers
jgirlich

Huh, no suggestions? Did I ask my question in a bad way or is there nobody who can explain the Qt event behaviour to me?

Anyway, best solution I found so far: Using a timer to delay the execution of 'maybeOpenQWindow' so the second single click event goes through and I can stop my m_timer on it.

Code:

---

bool MyDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
  if (QEvent::MouseButtonRelease)
  {
    qDebug() << "single click";
    if (m_timer->isActive())
      m_timer->stop();
    else
      m_timer->start();
    event->accept();
    return true;
  }
  else
  {
    return false;
  }
}

---

And the slot looks like this:

Code:

---

void maybeOpenQWindow(const QModelIndex &index)
{
  QTimer::singleShot(75, this, SLOT(reallyMaybeOpenQWindow()));
}

---

I know it's really dirty, but since I don't seem to understand the event inside a QTableView and it's delegates it's the only way I found to get it working.