[mcclim-devel] mouse wheel gesture?

[Andy Hefner]

On Thu, Dec 23, 2010 at 6:25 AM,  <rm at tuxteam.de> wrote:

> Well, the wheel buttons are used in panes.lisp (for scrolling), so maybe
> you could just test scrolling with the mouse wheel. Thinking of it:
> maybe your application pane inherits from mouse-wheel-scroll-mixin and somehow the
> scroll event gets eaten by that class' dispatch-event ...

That's correct.  In McCLIM, the superclasses of application-pane are
clim-stream-pane, cut-and-paste-mixin, and mouse-wheel-scroll-mixin.

McCLIM arranges the classes with the expectation that most users want
mouse wheel scrolling (and other features not explicitly mentioned by
the spec), so the wheel scrolling mixin was incorporated by
application-pane and interactor-pane, allowing users with unusual
needs to instead inherit from clim-stream-pane. In retrospect, I
should also have included an initarg in each such mixin to disable the
feature.

I can't guarantee there isn't some other reason why using a wheel
button as a gesture might fail (having never tried it myself), but
bypassing the wheel scrolling code is necessary.