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Date: Thu, 1 May 2008 01:24:17 -0500
From: Peter Groves <pdgroves at gmail.com>
To: lablgtk at yquem.inria.fr
Message-Id: <20080501012417.59a99d33.pdgroves at gmail.com>
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Subject: [Lablgtk] Strange firing of Configure and Expose events with
	EventBox
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Hi,

I'm having trouble getting a custom widget to respond properly to gtk
events. I'm using an EventBox to handle all of the signals, but it
doesn't fire when I expect it to. 

As an attempt at brevity, here is the somewhat complex situation as a
list:

1) At this point, I have turned on all events just to make sure that
isn't the issue with:

	eventBox#event#add [`ALL_EVENTS];

2) Mouse events (MOTION_NOTIFY, LEAVE_NOTIFY, ENTER_NOTIFY) work as
expected. My application draws to the screen in response to mouse
events, and the correct image appears when I move the mouse around. I'm
accessing these like this:

	eventBox#event#connect#enter_notify enterCallback
	eventBox#event#connect#leave_notify exitCallback
	eventBox#event#connect#motion_notify motionCallback

3) My callback to expose:

	 eventBox#event#connect#expose exposeCallback

does not fire when the window is displayed at program startup, nor
when the window is minimized and maximized.

4) The expose callback does fire when the window is resized.

5) The actual drawing I do in response to exposure events seems to
complete when the window is resized, but the widget remains blank (or
perhaps it is immediately cleared). This is the same drawing function I
call in response to mouse events, so I know the drawing code is more or
less correct. (I start up the app, it's blank. I move the mouse over
it, it draws the image and my cursor tracking animation. I resize the
window, it is again blank.)

6) I never was able to receive configure events when the window is
resized (or initialized) using:

	eventBox#event#connect#after#configure resizeCallback

7) Because of (6) i switched to size_allocation events:

	eventBox#misc#connect#size_allocate resizeCallback

which fire when expected at startup and when the window is resized, but
are not sufficient because I cannot draw in response to them at program
startup (it seems to be called before the screen resources are
allocated - i can therefore initialize my image buffers and such but
cannot display them without an Expose event, which never comes). 

/end list

I would be ok if I could get expose events (or some other event) to
fire at the normal times of, well, the window being "exposed". Also the
issue in (5) above is a show stopper. I would also be interested,
though, in any insights as to why I would be unable to receive
Configure events when the window is resized.

I should say that I am porting this application from ruby-gtk, and what
I'm attempting to do worked there.

Peter

http://petergroves.com


 

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