[Qt-interest] Grabbing the mouse

[Tony Rietwyk]

Hi Phil, 

GrabMouse should work as you expect - the menus rely on it to cancel the
dropdown if you click anywhere outside the menu - whether in the same
application's windows or not.  

I wonder if MDI is affecting the mouse handling?  Try your example with just
the graphics scene and view - that is cut out the main window and mdi.  

Also, I think there are limits on the maximum size of pixel coordinates
(8,000?), so you probably should scale your view by 0.001.  

Hope that helps, 

Tony.



> -----Original Message-----
> Sent: Tuesday, 17 May 2011 18:38 PM
> 
> Thanks again Brad and MihaiNaydenov for your responses.  The 
> reason I'm trying 
> to do it this way is because I saw an example in the "Ivor 
> Hortons Beginning 
> Visual C++ 2008" book that does precisely what I'm trying to 
> achieve and does 
> it very well.  I must mention again that if I want to select 
> the centre of a 
> circle right outside the view(or even scene coordinates) 
> surely I should have 
> a means of doing so.  Having said that I do like your idea of 
> the scrolling 
> view.  Anyhows if it can easily be done in Visual C++ then 
> surely Qt can 
> manage it!!!  If grabmouse worked as I think that it should 
> then jobs done!!!
> But for what ever reasons (for me)it does not.
> I'm just trying to follow the example, but re-write it in 
> Qt(as close as 
> possible)
> I will look into trying  your idea of installing an event 
> filter on the entire 
> app.  I have tried to create a cut down example of the 
> problem as Brad 
> suggested:-

-- code sniped