Touchegg not for mobile!

Rodrigo Belém rclbelem at
Tue May 17 16:21:35 UTC 2011

I got your point and I agree with you now :-) but I think we should
take a look on it later and define default gestures for the main

On Tue, May 17, 2011 at 9:02 AM, Harald Sitter <apachelogger at> wrote:
> 2011/5/17 Rodrigo Belém <rclbelem at>:
>> Would't it work on touchscreen devices, which are evdev too?
> Sure it would, however I do not think the usage paradigm makes much
> sense. At any rate we'd need to be careful with what we do by
> default....
> On a touchscreen you are suggested to interact with things as they are
> presented. So you have a window, if you want to drag the window you
> press on the window's occupied space, hold and move. Having a gesture
> that goes like "swipe two fingers from left to right to switch track
> in amarok" does not necessarily match up to what you would expect it
> to do as there is no visual connection between what you do and what
> you do it on (i.e. plasma or a currently focused window).
> For touchpads this is a no-brainer as the touchpad itself is not
> directly linked to the screen space, or what you see there (e.g. by
> default you will not have a 1:1 mapping between screen space and
> world/touchpad space, meaning you might need to move >1 one times from
> top of your touchpad to bottom to get from top most point to bottom
> most point of the screen space).
> So, what I am saying is not that it does not work, but we should be
> verrryyyy careful about what we do by default on a touchscreen setup.
> In my opinion gestures only make sense on an application level for
> touchscreens. Like in marble you might want to have pinch-to-zoom, if
> you had the same gestures defined for touchegg, but doing something
> entirely different that would cause problems. Additionally if the
> touch interactions are not global but scoped to a widget/element
> within an application it maps perfectly with the whole usage paradigm
> of touchscreens with having a 1:1 mapping from world space to
> (visible) screen space.
> I hope this was somewhat understandable, I fear I might have been
> thinking faster than I was writing ^^
> regards,
> Harald
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