[Development] Touch not working with QtQuick1 (event handling issue in QGraphicsView)

Frank Osterfeld frank.osterfeld at kdab.com
Tue Mar 12 15:31:41 CET 2013

On Mar 12, 2013, at 2:01 PM, Sorvig Morten wrote:

> On Mar 11, 2013, at 2:44 PM, Frank Osterfeld <frank.osterfeld at kdab.com> wrote:
>> Hi,
>> I see two ways to fix it, one is a one-liner, one's more work:
>> * Don't silently accept touch events if no item is waiting for them. Ignoring the events triggers the touch->mouse fallback. That's the approach the attached patch takes and seems to work fine (tested with the QQ1 hello world example).
>> * Make QQ1 items accept touch events and do the touch to mouse mapping internally
>> Do you see issues with the first approach? I don't see why TouchMove and TouchEnd should be accepted if not handled, but TouchBegin is ignored if not handled.
> Hi, see https://codereview.qt-project.org/#change,48865 for further discussion.
> I think the "simple" approach makes sense, as long as we keep it in mind for if/when we get gestures working again. We can then revisit it and implement a different solution if needed.
> I've also had problems getting TouchBegin translated in the Qt Quick iOS demo we have. Is everything working flawlessly for you with the patch?

I tested with simple Hello-World style examples containing mouse areas reacting to onClicked. Do you have anything else I should test specifically?

Frank Osterfeld | frank.osterfeld at kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel. Germany +49-30-521325470, Sweden (HQ)  +46-563-540090
KDAB - Qt Experts - Platform-independent software solutions

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