[Qt-interest] WheelEvent propagation

[Oliver Demetz]

Hi again,

I have just found another detail (a bug?) concerning the problem.

In contrast to what I wrote, it is the case that the wheelEvent handler 
of the MainWidget gets the wheel event IN EVERY CASE.

The problem is the statement

    if(m_view.underMouse())

which is *false* if I clicked the first the menu and then on the view!

So again:

Doing as follows :

1. click button with menu.
  ->menu opens
2. click the graphicsview in order to close the menu
  ->menu disappears

now, when rolling the mouse wheel with the cursor over the view the 
expression

    if(m_view.underMouse())

evaluates to FALSE.

Is this a bug?

Regards,
Oliver

Oliver Demetz schrieb:
> Hi,
> 
> My MainWidget contains several buttons (with menus) and a subclass of 
> QGraphicsView, call it MainView.
> 
> I have some functionality associated with the mouse wheel, which has to 
> be performed fron the MainWidget class. It shall only be executed if the 
> mouse is over the Main View.
> 
> Therefore I implemeted:
> 
> class MainWidget : public QWidget{
> //...
>      protected: void wheelEvent ( QWheelEvent * event )
>      {
>          if (m_view.underMouse())
>          {
>              //do the funcitonality
>          }
>      }
> }
> 
> and the view ignores wheel events:
> 
> class MainView: public QGraphicsView{
> //...
>      protected: void wheelEvent ( QWheelEvent * event )
>      {
>          event->ignore();
>      }
> }
> 
> Thsi works perfectly, BUT:
> 
> As I said there are QPushButtons in my MainWidget with a menu.
> 
> If this menu is open, and if I click into the view in order to close the 
> menu, then the wheel funcitonality is not executed.
> 
> I was able to track this down, that the wheel event handler of the 
> MainView gets the event, but not the wheelevent handler of the MainWidget.
> 
> How can thsi be?
> It is just if the menu of a button was open and if I click directly on 
> the view then.
> 
> If I click somehere else in my MainWidget, move the cursor over the view 
> and roll the wheel then,everything works fine.
> 
> Thanks in advance
> Olli
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