Re: resizing a drawingarea

[Kees Kling <ckling upcmail nl>]

On 04/10/2011 02:43 PM, Robert Pearce wrote:
> Hi Kees,
>
> On Sun, 10 Apr 2011 11:19:01 +0200 you wrote:
> > On 04/10/2011 10:30 AM, Povietkin Konstantin wrote:
> > > В Вск, 10/04/2011 в 08:53 +0200, Kees Kling пишет:
> > > > I have a widget derived from Gtk::DrawingArea. This widget is placed in
> > > > a window. So far so good, but when I resize the window, the size of the
> > > > drawingarea stays the same. What must I do about that.
> > > You should use Gtk::Viewport.
> > Do you mean deriving from Gtk::Viewport or adding the widget to a
> > viewport, because the latter doesn't work for me
> I can't imagine why Konstantin thought a viewport was what you need. A
> viewport is a device for making a large unshrinkable widget fit in a
> small window by adding scroll bars.
>
> Unless I'm mistaken, a DrawingArea just presents somewhere to use the
> graphics primitives. It has very little inherent functionality. I
> assume you're using the on_expose_event hook to do some drawing? I
> think for resizing you will need to do something in the
> on_size_allocate hook too. And you'll need to modify the drawing
> algorithms in on_expose_event to take account of the new size.
>
>
> HTH,
>
> Rob
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Yes i'm using on_expose_event tyo do the drawing and I also has

the "virtual void on_size_allocate(Gtk::Allocation& allocation);" 
method. In this method I call ste_allocation(allocation) and I check on 
several places in my code what the geometry of the widget is and these 
are correct, but my drawingArea keeps its orginal  size.

Pls Help

Kees