[Qt-interest] cannot grab gesture with qgraphicsobject

[Wathek LOUED]

Yep Till it seems that there still some problems with the GestureRecognizer.

However I'm thinking of a solution to make this working. Maybe I can use
QGraphicsScene::itemAt function so that if a Gesture has been recognized and
there's an item at that position QGraphicsScene will create either a signal
or an event and send it to the item.

W.L

On Mon, Mar 14, 2011 at 11:44 PM, Till Oliver Knoll <
till.oliver.knoll at gmail.com> wrote:

> Am 14.03.11 23:00, schrieb Till Oliver Knoll:
> > ...
> > However I still don't know how to receive "pinch rotate" gestures on
> Windows 7 - in a QGraphicsScene, that is (I have yet to test the Qt example
> which operates on a plain QWidget).
>
> Here are some more findings: on said Windows 7 Started edition, on a
> Samsung "N150 Plus" netbook ("the only Windows 7 I have access to" ;)
> the Qt example "imagegestures" is NOT working either: to zoom, no
> rotation, no pan. When doing the zoom (aka pinch scale) or rotate
> gesture on the trackpad the mouse cursor changes shape, but the loaded
> image would not move at all.
>
> I know that when doing a "Pan" gesture (I have no clue how to do that on
> Windows anyway, on Mac that is touching and holding the finger for about
> 1/2 second on the trackpad) the Qt example app would change cursor -
> this is not the case either (I tried all sorts of gestures ;)
>
>
> By now I checked the mouse gesture settings of the driver, they all seem
> to be activated. It sais "Elan Smart-Pad" (www.emc.com.tw) - I agree
> probably not the "reference platform" to test gestures on Windows 7. ;)
>
> However when I tested my example on some DELL laptop running Windows 7
> Professional I also did not receive rotate events (back then with Qt
> 4.7.1 - currently I am using 4.7.2 on all mentioned platforms) and
> observed the same "reversed zoom effect" (which now has turned out to be
> wheel events instead).
>
> Then again, I really can't imagine that on Windows 7 gestures wouldn't
> work at all! At least Sean did several tests - he even tried my examples
> with the elsewhere mentioned problem with Pan gestures on Mac which
> seemed to work fine on his Windows 7 installation!
>
>
> This site
>
>  http://msdn.microsoft.com/en-us/library/dd353242%28v=vs.85%29.aspx
>
> seems to indicate that there is really a "gesture zoom" event GID_ZOOM,
> but on the other hand
>
>  http://msdn.microsoft.com/en-us/library/dd940543%28v=vs.85%29.aspx
>
> seems to suggest that it would default to "mouse wheel + CTRL". An event
> which the Qt example clearly does not handle at all. But thinking a bit
> more about it, "defaults to CTRL key + Scroll wheel" probably means "if
> not handled otherwise by handling GID_ZOOM / gestures at all". And I
> strongly suspect that Qt does the later ;)
>
>
> Bottom line: at least on a DELL laptop and on this Samsung Netbook
> (well...) I did not/do not receive rotate events in QGraphicsView. The
> Qt imagegesture example does not seem to work at all on that Samsung
> Netbook (it works perfectly on Mac OS X).
>
> I wonder whether other people observe that the Qt "imagegesture" example
> is not working on their Windows 7 installation, and whether that is
> really just because the trackpad driver does not properly work, or
> whether Qt does not receive/handle gesture events on Windows 7 properly.
>
>
> Cheers,
>  Oliver
>
>
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