"J.W. Bizzaro" <[EMAIL PROTECTED]> writes:
> Have you tried using the mapping behavior of the object?
>
> adj = GtkAdjustment()
> ...
> adj['lower'] = 10
>
> Just a guess. I haven't used adjustments myself. Can you send an example?
That was the first thing I tried, but it doesn't work. Minimal example:
>>> from gtk import *
>>> adj = GtkAdjustment()
>>> adj['lower'] = 0
Traceback (innermost last):
File "<stdin>", line 1, in ?
File "/usr/lib/python1.5/site-packages/gtk.py", line 50, in __setitem__
_gtk.gtk_object_set(self._o, {key: v});
TypeError: could not find argument "lower" in the `GtkAdjustment' class ancestry
>>>
The same thing happens in more complex setups where the adjustment is
attached to a scrollbar, the widgets are shown and the code is called
from the main loop.
>From the gtk sources, it seems that in C I'd have to modify the members
of the GtkAdjustment struct directly (from gtktext.c):
static void
adjust_adj (GtkText* text, GtkAdjustment* adj)
{
gint height;
gdk_window_get_size (text->text_area, NULL, &height);
adj->step_increment = MIN (adj->upper, (float) SCROLL_PIXELS);
adj->page_increment = MIN (adj->upper, height - (float) KEY_SCROLL_PIXELS);
adj->page_size = MIN (adj->upper, height);
adj->value = MIN (adj->value, adj->upper - adj->page_size);
adj->value = MAX (adj->value, 0.0);
gtk_signal_emit_by_name (GTK_OBJECT (adj), "changed");
}
Some background: I've begun to port Sketch to GTK. Porting the drawing
code was relatively simple because Xlib and GDK, being a thin wrapper
around Xlib, are very similar. The rest of the GUI will take a lot more
work.
Now when I change the zoom factor in Sketch's canvas, I have to either
change the adjustment's 'upper' and 'lower' or 'page_size' and the
*increments.
--
Bernhard Herzog | Sketch, a python based drawing program
[EMAIL PROTECTED] | http://www.online.de/home/sketch/
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