[Interest] [Development] Qt 5.4 multi-touchscreen problem.

[Celal SAVUR]

Hello Jereme,

Thank you for your response and forwarding my email to other list. I
checked the package in the official repository for ubuntu 14.04 but I could
not find the package higher than 2.2. There is three packages where I have
already installed (libxi-dev, libxi6, libx6-dbg) their version
is 2:1.7.1.901-1ubuntu1. It is not higher than 2.2. Although I have those
package are installed, result of the configure is still "mtdev no". By the
way I could not run "make confclean" instead I did "make clean".

If you have an opportunity to take a look your laptop, please tell me the
exact package name.

Or if you have another suggestions please let me know.


On Mon Feb 23 2015 at 6:18:59 PM Jereme Lamothe <jlamothe at 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.
>
> It sounds like you're doing the right thing, my only suggestions are
> to double check that you have the dev headers for the xinput package,
> and to run a `make confclean` before you run configure again.
>
> I found the easiest way to test if multitouch was enabled was to
> compile the fingerpaint example, and set the following environment
> variable before running. It would then print out device / lib info.
>
> QT_XCB_DEBUG_XINPUT_DEVICES=anything
>
> I reported this issue to Digia / Qt Company through commercial
> support, and was told the SDK libs were built this way intentionally
> to avoid compatibility issues, which is fair enough. Hopefully they
> are able to build against newer versions of xinput in future releases.
>
> (I've cc'd the interest list rather than development, it's probably a
> more appropriate place for this topic)
>
> On Mon, Feb 23, 2015 at 5:42 PM, Celal SAVUR <c.savur at 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.
> >
> > 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.
> >
> > 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
> >
> > _______________________________________________
> > Development mailing list
> > Development at qt-project.org
> > http://lists.qt-project.org/mailman/listinfo/development
> >
>
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