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.
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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
dandrader: That seems useful for making a testcase, thanks!
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https://bugs.launchpad.net/bugs/1307701
Title:
Unity does not get touch events when QML apps running
To manage
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
@Daniel, have you tried adding some qDebug() lines in the QT5 libraries
to see if we actually get the touch events and finally ungrab the
device? (the code is in
src/plugins/platforms/xcb/qxcbconnection_xi2.cpp)
Also, it would be interesting to see what XIGrabDevice and
XIUngrabDevice return.
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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
** Changed in: unity (Ubuntu)
Assignee: Stephen M. Webb (bregma) = Daniel d'Andrada (dandrader)
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Title:
Unity does not get touch events
The problem does not occur in a Gnome Flashback (Compiz) session, so it
is evidently a result of the interaction between the XInput2 touch grabs
used in Unity 7 (through Geis), the passive Xinput touch subscriptions
in Qt, and the pointer emulation in x.org.
Multi-touch pointer emulation in
Here is a test setup:
(1) install ubuntu-clock app
(2) modify /usr/share/gnome-session/sessions/ubuntu.session to remove the
'compiz;' entry so compiz gets started by upstart instead of gnome-session
(3) modify /usr/share/upstart/session/unity7.conf to add the following lines in
the pre-start
** 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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Title:
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
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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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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Title:
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