[gtkada] Viewport problems

[daniel holmstrom]

On Tue, Dec 04, 2001 at 12:28:34PM +0100, Emmanuel Briot wrote:
> daniel holmstrom <s99d at student.informatik.gu.se> writes:
> 
> > I'm trying to use a Scrolled_Widows vertical Adjustment to scroll a
> > widget in a viewport simultaneously as the widget in the
> > Scrolled_Window. Both widgets has the same height. 
> > 
> > But the viewport is always the same size as the widget in it, There's
> > probably something I'm missing here, but I've tried to read the source(c)
> > for gtk-scrolled-window without any success.
> > Could someone help me with this, please.
> 
> 
> In the last paragraph above, do you really mean the size ? The adjustments do
> not affect the size of your widget, they just affect which part of the widget
> is currently visible.

Sorry, no I mean it(the viwport) has the same _visible_ size as it's childs "real" size. But as you say the adjustments should affects which part of the viewports child that is visible, but in this case it doesn't. It always views the entire child(or more). The widgets are two Gtk_Drawing_Area:s, if that makes any difference.  

> 
> In the sources of gtkscrolledwindow.c, you should especially look at the
> gtk_scrolled_window_size_request and gtk_scrolled_window_size_allocate
> routines, since these are the ones that handle the resizing of the widget.
> 

gtk_scrolled_window_size_request and ..._size_allocate seems to do what one expected, but I thought that since I put the viewport in a table the table should be able to change the viewports (visible)size.  But it doesn't. I get the same results as if I didn't use a viewport at all, but just put the widget right into the table with a fixed size. 

So even if the viewports vertical adjustment has these values:

lower => 1
upper => 100
value => 1
page_size => 10

the viewport is still showing the entire child.

> Emmanuel
> 
> _______________________________________________
> gtkada mailing list
> gtkada at lists.act-europe.fr
> http://lists.act-europe.fr/mailman/listinfo/gtkada

-- 
daniel, 
<s99d at student.informatik.gu.se>