Re: Manipulating viewport in scrolled window
- From: Simon Gornall <simon unique-id com>
- To: GTK mailing list <gtk-list gnome org>
- Subject: Re: Manipulating viewport in scrolled window
- Date: Wed, 29 Aug 2001 23:32:42 +0000
John Cupitt wrote:
>
> Hi Simon,
>
> gtk_adjustment_set_value() just emits the "value_changed" signal, so objects
> listening for stuff on this adjustment will only look to see if the value field
> has altered.
>
> You've altered a bunch of stuff, so you need the full "changed" signal. I'd do:
>
> adj->lower = small;
> adj->upper = big - window_size; // is this is right?
> adj->page_size = window_size;
> adj->value = small + (big - small) / 2 - window_size / 2;
> gtk_adjustment_changed( adj );
>
> You obviously need to do this after you connected everything up.
Hmm. Perhaps I'm missing something to do with "after you connected..."
then because I'm still getting the same problem - the scrollbars are
scrolling to the correct point (adj->upper should just be 'big' BTW)
but the window view remains resolutely at (0,0).
I put
for (int i=0; i<255; i++)
_map.map[i*3 + 3*(i*_map.w)] = 255-i;
into the RGB buffer generator, and you can indeed see a fading red
diagonal line even though the scrollbars are positioned halfway along
the X & Y troughs.
The rendering code is definately being called before the draw code,
and the windows are all realised by the time the gtk_adjustment_changed
is called (The debug output looks like:
Connecting .....
Version is 4.2.10, world is 128x64
Rendered data to RGB buffer
Drawing now!
Drawing now!
The second 'Drawing now!' is because I put an explicit draw into the
startup code, once everything else is initialised. I get a subsequent
'Drawing Now!' every time I scroll the scrollbars with the mouse.
So, basically the adjustments are not scrolling the drawing_area widget.
This is very frustrating because I'm getting the adjustments to use
from the construct:
GtkAdjustment *adj;
adj = gtk_scrolled_window_get_hadjustment((GtkScrolledWindow *)mapWin);
etc.
Anyone else had a similar problem ?
Cheers,
Simon.
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