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Thread: How to receive gesture events on a QGraphicsItem?

  1. #1
    Join Date
    Sep 2013
    Qt products

    Default How to receive gesture events on a QGraphicsItem?

    I asked this same question on Stackoverflow and also on the Qt forums but nobody answers. I'm facing some problems with gesture events on the QGraphicsItem objects.

    I already set:

    Qt Code:
    1. graphicsView->setAttribute(Qt::WA_AcceptTouchEvents);
    2. graphicsView->viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
    3. graphicsView->grabGesture(Qt::PinchGesture);
    4. graphicsView->viewport()->grabGesture(Qt::PinchGesture);
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    And I’m still unable to receive gestures on the sceneEvent method of a QGraphicsItem using Qt 5.1, does anyone knows why ?

    The Qt 5.1 documentation says:

    "When the user performs a gesture, QGestureEvent events will be delivered to the target object, and these can be handled by reimplementing the QWidget::event() handler function for widgets or QGraphicsItem::sceneEvent() for graphics objects."

    I'm implementing the QGraphicsItem::sceneEvent() and I'm receiving TouchBegin/TouchEnd/TouchUpdate events, but I never receive gesture events. It is weird that the QGraphicsItem doesn't have the method grabGesture() but the QGraphicsObject has this method.

    Thanks !

  2. #2
    Join Date
    Jan 2006
    Warsaw, Poland
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    Default Re: How to receive gesture events on a QGraphicsItem?

    Does your screen device support multitouch?
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.

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