Ticket #941 (closed defect: worksforme)
Kinetic scrolling is hard to use with fingers
| Reported by: | igorfoox@… | Owned by: | mickey |
|---|---|---|---|
| Priority: | high | Milestone: | |
| Component: | openmoko-libs | Version: | 2007.2 |
| Severity: | normal | Keywords: | |
| Cc: | buglog@… | Blocked By: | |
| Blocking: | Estimated Completion (week): | ||
| HasPatchForReview: | no | PatchReviewResult: | |
| Reproducible: |
Description
When using fingers to scroll it's really easy to get the touch part of the
touch-and-drag recognized as a click. This is a bit better when using the
stylus, but I'm sure that finger scroll is also a use case.
I'm not entirely sure what can be done to make this better. One possibility is
to make the UI use a double-click instead of a single-click for activating items
as it currently does. Then a single-click recognized as part of a scroll won't
be confused with the activating click.
If this is in the wrong component please redirect, I wasn't sure where to file this.
Change History
comment:2 Changed 10 years ago by alphaone@…
I just started ts_test and had a look at the debug output when I make the
typical "scroll gesture".
If I don't press hard enough right at the beginning this is what I get:
1192555459.363945: 203 191 1
1192555459.378897: 203 191 0
1192555459.413949: 224 357 1
1192555459.428926: 202 268 1
1192555459.443950: 190 276 1
1192555459.458950: 180 294 1
1192555459.473949: 178 308 1
1192555459.488945: 173 336 1
1192555459.488945: 172 356 1
1192555459.518898: 185 406 0
So it first registers a click and then a drag. For the time being this situation
can be avoided by pressing harder.
comment:3 Changed 10 years ago by thomas@…
There have been several improvements to the code for this. Is the click problem
still and issue?
In my experience this comes from your finger "bouncing", i.e. you put your
finger on the touch screen and tslib registers a press but right after that your
pressure releases and tslib thinks that you in fact have just clicked on the
touch screen.
With a stylus it would be less likely to happen since the pressure there is larger.
Using double clicks on a touch screen is quite cumbersome and in our GUI style
guidelines the double click is "strongly discouraged" (see
http://wiki.openmoko.org/wiki/GUI_Style_Guidelines#Touch_Screen).
We would need some kind of pressure detection/hysteresis for the touch screen,
but I'm not quite sure if/how we can do this.