On 24 Feb 2015, at 00:18, Jereme Lamothe jlamo...@docboxinc.com wrote:
I went through this process as well. The Qt libraries that ship w/ the
SDK (at least as of 5.3) are built against XInput 2.0, which is too
early for multi-touch support. In order to support touch events, I
downloaded the xinput 2.2 libraries / headers from the ubuntu
repositories and compiled Qt from source. I'm away from my linux
laptop at the moment, so am unable to say the exact package name, but
they're present in the official repos as of at least Ubuntu 12.04.
Indeed that’s one problem (QTBUG-35583): it’s actually built on Ubuntu 11.10
which has XInput 2.1 headers. 12.04 is new enough to have 2.2. But now we are
planning to do “universal” Linux builds on RedHat 6.5. The builds from Ubuntu
11.10 happened to be compatible with some other older distros; but if we do the
build on RedHat, the result should be more portable to both older and newer
distros of various kinds. I have tested such a build on Ubuntu 14.04 and
Centos 6.6, and multi-point touch is working. So we can expect this problem to
be solved for the 5.5 release. Please test the beta when it becomes available.
There are also long-standing bugs in the gesture framework, as well as
limitations of its design. (Try
qtbase/examples/widgets/gestures/imagegestures: you will see that two fingers
are required to do anything, because we have unsolved problems preventing us
from enabling single-finger panning or swiping by default; and there’s still a
bug with pinch zooming too.) But usually you are better off writing
multi-touch applications with Qt Quick anyway. It doesn’t make any use of
QGestureEvents so far.
On Mon, Feb 23, 2015 at 5:42 PM, Celal SAVUR c.sa...@gmail.com wrote:
Hello Everybody,
I am trying to use a multi-touch screen with my qt application. I have
downloaded the qt 5.4 for Linux (Ubuntu 14.04). But unfortunately Gesture
event does not deliver to the event function.
My goal to catch swipe gesture then assign some task to do so.
Maybe it wouldn’t be too hard to detect a swipe by handling touch events
directly instead of expecting QGestureEvents. But in QtQuick a swipe is
normally used to manipulate something visually: you can swipe a Flickable,
ListView, GridView or PathView, for example.
I tried to download Qt 5.4 source code then compile myself but anytime I try
to configure the source file the flag was mtdev no. After my research, I
have discovered Qt required xinput 2.2 and higher but ubuntu 14.04 using
1.6xx.
Ubuntu 14.04 is definitely new enough, as long as you have installed libxi-dev
(which depends on x11proto-input-dev). The version 1.6.xx (or
1.7.1.901-lubuntu1 on my 14.04 system) is not the same as the XInput protocol
version. You can check like this:
$ grep -i minor /usr/include/X11/extensions/XI2.h
#define XI_2_Minor 3
That’s provided by the x11proto-input-dev package. So we have headers
describing the XInput 2.3 version, which is newer than 2.2, which is where
multi-point touch support was added, and therefore the 2.2 is the minimum
version that Qt needs to be built with in order to know how to handle touch
events from the server.
mtdev is probably not needed.
One interesting thing is that gesture (just touchbegin, touchpdate,
touchend) is working with Qt 4.8 but not working Qt 5.4. I want to use
Qgesture class but it does not work either 4.8 nor 5.4.
I have spent too much time to fix this problem, but I could not. I need
someone to help me to overcome this problem.
Thank you in advance.
celal
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