So the touchscreen tries to mimic a UI button that only sends a release
when the finger is released while inside the button area.
Since mir does not receive a release event from libinput we send repeat
events instead.
Should we define a cancel key press event type? That might be useful in
other situations too. E.g. when handling pressed keys during VT
switching.
** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Summary changed:
- libevent doesn't handle EV_KEY event with a value of 255 (BUTTON_CANCLED)
+ libinput doesn't handle EV_KEY event with a value of 255 (BUTTON_CANCLED)
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Touch seeded packages, which is subscribed to mir in Ubuntu.
https://bugs.launchpad.net/bugs/1547864
Title:
libinput doesn't handle EV_KEY event with a value of 255
(BUTTON_CANCLED)
Status in libinput package in Ubuntu:
New
Status in mir package in Ubuntu:
New
Bug description:
I port Ubuntu Touch to LG L90 Dual. When I press a button below the
screen (it's the touch button and is part of the touch screen), then
slide the finger up, a letter will repeatedly appear in any text field
selected (for instance, if the button is a menu button, letter 'e'
will appear repeatedly). Using evtest with the touch screen device, I
can see what happened:
Event: time 75.605520, type 1 (EV_KEY), code 139 (KEY_MENU), value 1
Event: time 75.605525, -------------- EV_SYN ------------
Event: time 75.707065, type 1 (EV_KEY), code 139 (KEY_MENU), value 255
(See the full log here: http://paste.ubuntu.com/15112114/)
When I place the finger down, touch screen will send an event with type 1
(EV_KEY), code 139 (KEY_MENU), and value 1, indicating that the button is
placed. And when I move the finger away from the button, touch screen will send
an event with type 1 (EV_KEY), code 139 (KEY_MENU), and value 255. Digging in
kernel code reveals that this is defined as "BUTTON_CANCLED". Looking in
libevent code, it seems that it always assume that anything that is not 0 will
be considered as pressed, which makes it looks like the button is hold.
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