Re: having a scollable widget

[Havoc Pennington <hp redhat com>]

gregor waltz villanova edu writes: 
> so for 1.3.x, the widget should listen for the
> set_scroll_adjustments_signal then use gdk_window_scroll? 

Nope, the set_scroll_adjustments_signal is just how the scrolled
window will give you your adjustments. Then you have to set all the
values in the adjustments, and scroll when adjustment->value changes. 
Normally you use adjustment->value to represent the X or Y coordinate
to scroll to.

I forgot to mention the bin_window thing - you want widget->window to
stay fixed and be the size of your widget size allocation, and then
you scroll the bin_window around inside it. bin_window should be the
size of the entire scrollable area.

GtkTextView uses this technique.

GtkTreeView and GtkLayout look like they're using gdk_window_move()
instead of gdk_window_scroll(), I'm not sure what's up with that, I
have to ask Jonathan and Owen.

Anyway, get the source code and check out some of these widgets.

> do you recommend just inheriting from GtkLayout?

It might make things a bit easier, but hardly necessary, most of the
hard logic is now in GDK instead of GtkLayout, so GtkLayout isn't
doing anything too fancy. GtkLayout is probably a much simpler example
than the TextView or TreeView though.

Havoc