Re: Routing scroll events in a Gtk.Overlay

[richard boaz <ivor boaz gmail com>]

for what it's worth (i.e., without necessarily delving into all the possible finer points):

instead of using GTK to route the events correctly, is it not possible (possibly preferable) to route all events to your own handler which you yourself can further negotiate and forward to the necessary widget?

that is, instead of trying to contort your code to use some (possibly) existing GTK paradigm to get your events properly routed, why not just trap them at the upper-most level yourself and apply your own logic to get them correctly routed downstream?

if this suggestion comes across as useless and/or too shallow for further consideration, please discard accordingly.

cheers,

richard

On Thu, Jun 5, 2014 at 10:48 AM, Robert Schroll <rschroll gmail com> wrote:

On Wed, Jun 4, 2014 at 11:19 PM, Paul Davis <paul linuxaudiosystems com> wrote:

You should know that GTK's design more or less does not cater to overlapping GtkWidgets. It is not completely clear if you are actually doing this, but it certainly sounds as if you are. The API allows you to create overlapping widgets, but nothing else in the API (though I admit to knowing GTK3 not as well as I should) defines event handling when this happens. Z-axis (or "stacking) ordering needs to be defined for this to be done rationally. GTK does not provide this as far as I know (GTK2 definitely does not and I don't think GTK3 changed this).

It seems to be behaving perfectly sensibly.  Scroll events go to the widget directly under the pointer, whether that's the overlaid or the underlying widget, and the bubble up through the parents.  What I'm asking (I think) is if there's a way to change that sensible behavior.  (And I have found one, but it involves scroll-event handlers on every widget.)

We don't need to consider overlays, if that's worrisome.  Consider a composite widget, say an EventBox with a whole hierarchy of children.  Is there some way to make one type of event go directly to the EventBox, while others go through to the children?  I'd hoped I could do this with set_above_child() and set_events(), but I haven't been able to make that work.

Thanks,
Robert



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