[Interest] QtWebEngine Linux navigator object

Johannes Pointner h4nn35.work at gmail.com
Wed Sep 13 08:41:49 CEST 2017

Hi Alexandru,

thanks for the hint. I added a few debug messages and saw that the
chromium code doesn't know that there is a touch device
available(touch_device_linux.cc:IsTouchDevicePresent() ) -> so
maxTouchPoints returns obviously zero. Also the InputDeviceManager has
no keyboard or mouse device.

So I suspect that under Linux Qt gets the information about the input
devices and the chromium part never gets the events about the input
devices? Could this be the case?
Also I think I know why this works on Windows, because they don't use
there the InputDeviceManager to get this information instead they call
system functions.

On Fri, Sep 8, 2017 at 1:55 PM, Alexandru Croitor
<alexandru.croitor at qt.io> wrote:
> Hi,
> The relevant code that finds the maxTouchPoints value is int qtwebengine/src/3rdparty/chromium/ui/base/touch/touch_device_linux.cc inside the MaxTouchPoints() function.
> That function iterates over the available touchscreens (not touchpads though). Thus my initial guess is that the touchscreen is not detected for some reason. I would try to find where the list of touchscreen is populated and work from there.
>> On 8. Sep 2017, at 13:33, Johannes Pointner <h4nn35.work at gmail.com> wrote:
>> Hi,
>> I'm trying to get the info from the browser if the device supports multitouch.
>> There is a navigator object maxTouchPoints
>> (https://developer.mozilla.org/en-US/docs/Web/API/Navigator/maxTouchPoints)
>> which would do the trick.
>> This works with Chromium in Linux and with Chrome and QtWebEngine in
>> Windows but not with the QtWebEngine in Linux (ArchLinux).
>> Is this supported by the QtWebEngine under Linux?
>> Is there something I missed (config build flag maybe)?
>> Thanks,
>> Hannes
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