Hi Matteo,
First, thanks for your reply! Unfortunately, I'm not sure your solution
would work for what I'm trying to do (as is). In essence, I'm trying to
create a GUI with several irregularly shaped buttons, whose bounding
boxes overlap (but not the actual shapes). (For example, think of a
rectangle cut across the diagonal -- each resulting triangle would be a
button.) I guess I could subclass QGraphicsScene, and add a method to
register the buttons' masks with the scene, and create my own logic for
determining which button should receive a click event when someone
clicks on the scene (by redefining mousePressEvent, as you suggested).
I suppose that's what I'll do, until someone can determine if this is a
bug or the proper behavior.
Thanks for the suggestion! I wouldn't've thought of it otherwise.
- J
Matteo Boscolo wrote:
Hi Jeremy,
I did some test and I notice that if you use the ..
graphics_view.setMask(....)
you get the get some problem.
I do not why The view work in this way..I'm not so skilled in qt to help
you.
But a work around could be:
graphics_scene.mousePressEvent =myMouseEvent #to get the mouse click event
..
def myMouseEvent(event):
#if event is in region:
event.ignore()
Regards,
Matteo
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jeremy
Sent: 11 June 2010 19:47
To: [email protected]
Subject: [PyQt] Bug with QWidget masks in QGraphicsScene?
Hello,
I have a question (which may stem from either a bug in PyQt, Qt, or just my
understanding of how Qt is supposed to work). In particular, according to
the Qt documentation
(http://doc.trolltech.com/4.6/qwidget.html#setMask) masked widgets are only
supposed to receive mouse events on their visible portions. This works fine
on a normal widget in a GUI, but doesn't seem to be the case if I add a
widget to a QGraphicsScene via the addWidget method.
In particular, some example code is attached. In this example I create two
buttons, and place one in a QGraphicsScene and the other as part of a normal
layout. I then add a simple mask so that only the left half of each button
is visible. Then, if I click the non-visible part (right
half) of the normal-layout-button, nothing happens (which seems like the
correct behavior). But if I click the invisible right half of the
QGraphicsScene button, the button still appears to be receiving the mouse
click event.
So, my question is...is this a bug in PyQt? Or does the same behavior happen
under Qt in other languages? Or is it not a bug at all, and QWidgets are not
supposed to respect their masks with regard to mouse events when added to
QGraphicsScenes? Or am I just totally crazy? ;-)
Any advice or suggestions anyone can provide would be very much appreciated!
- Jeremy
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