eventFilter: test if enter a subWidget in my subclassed QWidget

**vonCZ** · 9th December 2007, 12:40

I've subclassed QWidget to make a button panel: BuPan. BuPan consists of buttons, a slider, and checkBoxes: it's a small panel that pops up next to a QPushButton in my mainApplication like so:

Qt Code:

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bool Window:eventFilter(QObject *obj, QEvent *event)
{
  if(event->type() == QEvent::Enter)
  {
    if(obj == myQPushButton)
    {
      myBuPan->move(xloc, yloc);
      myBuPan->show();
      return QWidget::eventFilter(obj, event)
    }
    etc...
}

bool Window:eventFilter(QObject *obj, QEvent *event)
{
  if(event->type() == QEvent::Enter)
  {
    if(obj == myQPushButton)
    {
      myBuPan->move(xloc, yloc);
      myBuPan->show();
      return QWidget::eventFilter(obj, event)
    }
    etc...
}

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pb[0] is a button in myBuPan. I want to check for an Enter event on this particular button within BuPan; I thought I could do the following:

Qt Code:

Switch view

bool Window:eventFilter(QObject *obj, QEvent *event)
{
  if(event->type() == QEvent::Enter)
  {
    if(obj == myQPushButton)
    {
      myBuPan->move(xloc, yloc);
      myBuPan->show();
      return QWidget::eventFilter(obj, event);
    }
    if(obj == myBuPan->get_pb(0))
    {
      qDebug("HIT!!");
      return QWidget::eventFilter(obj, event);
    }
    etc...
 
// ...and I have the following in bupan.h:
 
    QList<QPushButton *> pb;
    QPushButton *get_pb(int value)    { return pb[value]; }

bool Window:eventFilter(QObject *obj, QEvent *event)
{
  if(event->type() == QEvent::Enter)
  {
    if(obj == myQPushButton)
    {
      myBuPan->move(xloc, yloc);
      myBuPan->show();
      return QWidget::eventFilter(obj, event);
    }
    if(obj == myBuPan->get_pb(0))
    {
      qDebug("HIT!!");
      return QWidget::eventFilter(obj, event);
    }
    etc...

// ...and I have the following in bupan.h:

    QList<QPushButton *> pb;
    QPushButton *get_pb(int value)    { return pb[value]; }

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Shouldn't this work? ...er, it's not.

...ideas?

Or will I have to add an "enterEvent(QEvent *event)" method to the BuPan class itself? If I have to do this second option: How can I write the bupan "enterEvent" method so that it's generic... for example, so that pb[0] and pb[2] will capture enterEvents on one instance of BuPan, but on another instance only pb[4] might capture the events?

**marcel** · 9th December 2007, 12:54

You can either install the window as event filter for BuPan and the button inside BuPan, and leave your code like it is now, or(better), install BuPan as event filter for the button, and create an eventFilter for BuPan.

**vonCZ** · 9th December 2007, 15:52

Originally Posted by marcel

You can either install the window as event filter for BuPan and the button inside BuPan, and leave your code like it is now,

thanks Marcel. The reason it wasn't working: I didn't installEventFilter() properly. Working now.

Originally Posted by marcel

or(better), install BuPan as event filter for the button, and create an eventFilter for BuPan.

I'm still not sure how to do it this way. Currently--in my mainApplication eventFilter ("Window")--I include events to filter in by referencing specific widget-objects to test whether the mouse enters/leaves the objects. But I don't know how to create an eventFilter for a subclassed QWidget that would be flexible. For example, some of my BuPan instances will have 10+ buttons, none of which need to be filtered, whereas other BuPans might have 7 buttons, half of which need to be filtered, etc...