Re: How to do_size_allocate properly in a gtk.Viewport subclass

[Joel Hedlund]

Joel Hedlund wrote:
And another relevant question: am I overcomplicating this? 


Yes. :-)

The proper way of doing this is to pack the widget in a container, and 
then add the container (with viewport) to a scrolledwindow.


For example, for a centered widget choose a 1x1 gtk.Table and attach the 
widget using xoptions = yoptions = gtk.EXPAND (and not gtk.FILL). For a 
widget glued to the upper left corner choose a gtk.Alignment().


Thanks John Finlay at [EMAIL PROTECTED]

/Joel
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Re: How to do_size_allocate properly in a gtk.Viewport subclass

[Joel Hedlund]

Hrvoje Niksic wrote:

Note that there's a mailing list dedicated to PyGTK,
<[EMAIL PROTECTED]>, so you might also want to ask your question there.


Thanks. I'll try that and hope people won't take offense from 
cross-posting. I'll be wathching this thread for answers too though. In 
my experience, c.l.p usually delivers.


Cheers!
/Joel
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Re: How to do_size_allocate properly in a gtk.Viewport subclass

[Hrvoje Niksic]

Joel Hedlund <[EMAIL PROTECTED]> writes:

> I've raised this issue on #pygtk and #gtk+ but with no luck.

Note that there's a mailing list dedicated to PyGTK,
<[EMAIL PROTECTED]>, so you might also want to ask your question there.
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How to do_size_allocate properly in a gtk.Viewport subclass

[Joel Hedlund]

Hi!

I've raised this issue on #pygtk and #gtk+ but with no luck. I haven't 
been able to solve this even with aid of google, the pygtk reference and 
the gtk C source, so pretty please help?


I'm making an application that you can think of as an image viewer. I 
want to display a widget in a gtk.Viewport. The widget can have any size 
from tiny to humungous. I don't want the viewport to ever give the 
widget a larger size allocation than requested, and I don't want the 
viewport to ever resize to accomodate a large widget. It should rather 
leave grey areas around the widget/show only a portion of the widget.


To do this I have subclassed gtk.Viewport (MyViewport) and overrided the 
do_size_allocate method:



def do_size_allocate(self, allocation):
self.allocation = allocation
child_req = self.child.get_child_requisition()
child_alloc = gtk.gdk.Rectangle(0, 0, *child_req)
self.child.size_allocate(child_alloc)
self.props.hadjustment.update(allocation.width, child_alloc.width)
self.props.vadjustment.update(allocation.height, child_alloc.height)
if self.flags() & gtk.REALIZED:
self.window.move_resize(*self.allocation)
self.child.window()


When I add a very large widget (a gtk.DrawingArea) to MyViewport only 
the originally visible portion of the widget is redrawn when I resize 
the window using the mouse, and the grey area around widget gets 
littered with grey lines that are not redrawn if you minimize and 
restore the window. I assume this comes from that the proper gdk windows 
haven't been updated, and that the grey lines are remnants of old 
Viewport borders.


In gtk_viewport_size_allocate in gtkviewport.c, gdk_window_move_resize 
is called on three gdk windows: viewport->window, viewport->view_window 
and viewport->bin_window, but in pygtk I only have gtk.Viewport.window. 
I assume that this is the problem? If so, how can I fix this? Or is 
there something else that I have overlooked?


And another relevant question: am I overcomplicating this? Is there some 
kind of flag that I could set on a vanilla viewport to accomplish this?


Thanks in advance,
Joel
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