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While traditional mouse movement suffices for single-touch interaction on a touch screen, where mouse movement indicates dragging on the screen, Qt provides a gesture framework that handles user panning, pinching, and swiping. It lets you extend the gesture recognizer to interpret and handle application-specific gestures of your own. The framework uses the QGesture class to share information common to all gestures, gesture-specific subclasses such as QPanGesture, and the existing event system. To indicate your widget can handle gestures, it must invoke grabGesture, passing the gesture ID (Table 5 2) of the gesture it can handle. (If you implement a custom gesture, the framework assigns it an ID when you register the gesture using QGestureRecognizer::registerGesture.) As an example, here s how to recognize and act on swipe gestures, borrowed from Qt s Image Gesture example. The widget s constructor grabs the swipe (and other gestures), indicating to the gesture system that it wants to receive those gestures: java barcode generator QR Code Scanner - Barcode Scanner for Android - JournalDev
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