Hi,
Thank you for your help. It may be the case that the
QGraphicsView::viewportEvent(pEvent) is called first and redirects the
QGestureEvent to the QGraphicsObject. However, from my testing the
QGraphicsView::viewportEvent(pEvent) always returns true for
QGestureEvents, event when they were not used by a QGraphicsObject or
a QGraphicsItem. Likewise, the QEvent::isAccepted() always returns
true for QGestureEvents. I have tested this using the modified
function that follows while performing gestures directly on the view
(i.e., not on a QGraphicsObject or QGraphicsItem). I theorize that Qt
my accept all gestures in the view if viewport()->grabGesture() is
called for that gesture. Does anyone have any ideas of a work around
that would allow me to only use a gesture in the viewport if it was
not consumed by a QGraphicsObject?
bool MyGraphicsView::viewportEvent(QEvent *pEvent) {
bool used = QGraphicsView::viewportEvent(pEvent) &&
pEvent->isAccepted();
if(!used && pEvent->type() == QEvent::Gesture) {
std::cout <<
"Gesture Event Received from viewportEvent()" <<
std::endl;
pEvent->accept();
return true;
}
return used;
}
Regards,
Sean
On Tue, Jul 13, 2010 at 9:11 AM, Marcus Tillmanns
<[email protected]> wrote:
> Hi,
>
> I would guess that it first has to go through
> QGraphicsView::viewportEvent(pEvent); ( because it redirects the event to
> the correct GraphicsObject ). I'd guess that
> QGraphicsView::viewportEvent(pEvent); will return whether the event was
> consumed or not.
>
> Cheers,
> Marcus
>
>
> On [DATE], "Sean Hayes" <[ADDRESS]> wrote:
>
>> I am using Qt 4.6.3 with Windows 7 with Multi-Touch hardware. I am
>> creating a QGraphicsObject that receives QGestureEvents using the
>> following function:
>>
>> bool MyGraphicsObject::sceneEvent(QEvent* pEvent) {
>> switch (pEvent->type()) {
>> case QEvent::TouchBegin: // Needed to get around potential Qt bug
>> pEvent->accept();
>> return true;
>> case QEvent::Gesture:
>> std::cout << "Gesture Event Received from sceneEvent()" << std::endl;
>> pGestureEvent->accept();
>> return true;
>> }
>>
>> return QMapItem::sceneEvent(pEvent);
>> }
>>
>> However, those events are still getting passed to viewport because my
>> QGraphicsView is receiving them as well via:
>>
>> bool MyGraphicsView::viewportEvent(QEvent *pEvent) {
>> if(pEvent->type() == QEvent::Gesture) {
>> std::cout << "Gesture Event Received from
>> viewportEvent()" << std::endl;
>> pEvent->accept();
>> return true;
>> }
>>
>> return QGraphicsView::viewportEvent(pEvent);
>> }
>>
>> It seems to me that if the QGraphicsItem receives a gesture, the
>> gesture should not be passed to the viewpoint unless the QGraphicsItem
>> passes the event to its super class. Is that correct? Is there a way
>> for me to make this happen?
>>
>> Thank you for your help.
>> _______________________________________________
>> Qt4-preview-feedback mailing list
>> [email protected]
>> http://lists.trolltech.com/mailman/listinfo/qt4-preview-feedback
>
> Marcus Tillmanns
> Manager Software Engineering | P&S Creative Enthusiasts
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