[Interest] Slow touchscreen (eGalax) response in QML using evdevtouch plugin and eglfs platform

Georgije Bosiger gbosiger at gmail.com
Wed May 28 10:54:10 CEST 2014

I doubt it. For instance when making a simple slider, if I don't add any
functionality to a draggable rectangle it follows my input really fast. As
soon as I attach a handler to the signal"onPositionChanged" (mousearea ) or
for instance to the signal "onXChanged" (rectangle) it stops following my
finger after certain speed and jumps to last postion when I stop. At the
same time also signals stop triggering my handlers until I stop moving my
finger. Based on this observation it is hard for me to believe that the
problem is in the device or the driver.

2014-05-28 10:20 GMT+02:00 Rutledge Shawn <Shawn.Rutledge at digia.com>:

> On 27 May 2014, at 3:06 PM, Georgije Bosiger wrote:
> > From what I've seen it turns out that the problem is in
> "onPositionChanged" signal. For some reason attached handler to this signal
> is not executed on faster movements when evdevtouch is used, but it's OK
> for the evdevmouse. This realization lead me to use the timer instead, so
> that now I make changes on defined interval while touch is pressed. This
> way response to the input is fast.
> It's too bad that you need a workaround, so it would be nice to narrow
> down why it happens.  I don't think we were trying to do event compression
> until https://codereview.qt-project.org/#change,82975 , but that's only
> on dev branch so far… so I guess it must be happening in the device or the
> driver.
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