** Summary changed:
- Unity does not get touch events when SDK apps running
+ Unity does not get touch events when QML apps running
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On a side note: multitouch in xorg is very problematic. Just now I had
to reboot my xps touch screen laptop because the mouse pointer emulation
logic no longer worked (pointer simply disappeared on touch). In another
attempt playing with multitouch, xserver simply crashed and I was sent
back to
hmm, and pointer emulation actually still works for other apps when
their windows are focused. You just can't focus them by tapping them.
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So, when you run a QML app and tap on it, it seems that the mouse
pointer emulation dies but multitouch events still flow normally as
unity still responds to 3-finger (window drags, alt-tab switch) and
4-finger (show/hide dash, launcher drag) gestures
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** Changed in: unity (Ubuntu)
Assignee: Stephen M. Webb (bregma) = Daniel d'Andrada (dandrader)
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https://bugs.launchpad.net/bugs/1307701
Any QML application at all will do (such as Item
{width:600;height:600})
What seems to be happening, from what I've learned so far:
- user touches on a qml application
- xserver sends the resulting touch events to both the qmlscene and to
compiz/unity7
- xserver offers ownership to
One thing that smells fishy is that the qml app starts getting touch
events even before compiz/unity7. I think that this should not happen as
the qml app does not subscribe for ownership events (unlike
compiz/unity7) and ownership is offered to compiz/unity7.
So the qml app should only get touch
On my system the touchscreen keeps working after using a QML app. It
still gets gestures (e.g 3 fingers on the screen) but it won't work on
some windows. Furthermore, I can't drag windows by the decoration any
more.
Multifinger gestures keep working because they do not depend on
pointer/mouse
Took the liberty of correcting the bug title as unity does keep getting
touch events. It's the xserver mouse pointer emulation from touch events
that breaks badly.
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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Attaching detailed xserver log. The following steps were taken:
1- sudo restart lightdm (to restart the X server. so that de have a clean slate)
2- run a very simple qml app with qmlscene
3- tapped on that qmlscene window (touch id 1)
4- tapped on the desktop area (nautilus) (touch id 2)
5- sudo
xserver packages I used to take the logs above.
** Attachment added: xserver debian packages with detailed logging of input
events
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1307701/+attachment/4106288/+files/xorg_debug_packages.zip
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Is there a specific reason for calling XISelectEvents() for each
slave vs using XIAllMasterDevices in QXcbConnection::xi2Select() in Qt?
Would have to dig into Qt code to tell that. But my guess is that
because it exposes QTouchDevice objects to applications. For every
QTouchEvent you can get
And here's the upstream bug I reported:
https://bugs.freedesktop.org/show_bug.cgi?id=78345
** Bug watch added: freedesktop.org Bugzilla #78345
https://bugs.freedesktop.org/show_bug.cgi?id=78345
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Qt still XISelectEvents my N-Trig Pen stylus and N-Trig Pen eraser
slave devices though. But thankfully no events come from them and thus
peace is maintained :)
** Changed in: unity (Ubuntu)
Status: In Progress = Invalid
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I confirm that the Qt from
https://launchpad.net/~canonical-x/+archive/x-staging does
XISelectEvents on the master pointer (instead of the touchscreen slave
device, as previously) and that the resulting behavior of the xserver is
good. Ie., touch ownership mechanics work properly and mouse pointer
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