UI Framework-1: Aura Gesture Recognizer
Gesture Recognizer
Gesture Recognizer OverviewThis document describes the process by which Touch Events received by a WindowEventDispatcher are transformed into Gesture Events. Touch Events
Gesture EventsGesture Events contain type specific data in their GestureEventDetails object. See here for a summary of the typical event sequences.
Terminology
Finding a TargetPossible ways of establishing a target
In the following images, a filled in circle represents a touch down, and the outline of a circle represents a position the touch has moved to. The dotted green line indicates the window that a touch is targeted at. The rounded rectangle represents a window, and the outer rectangle represents the root window.
ComplicationspreventDefault’ed ReleaseWhen Javascript calls preventDefault on a touch release, we need to make sure that no gesture events are created, but we also need to ensure that the GestureRecognizer knows that the associated finger isn’t down any more. To accomplish this, we turn the touch release into a touch cancel event. Touch CaptureWhen a touch capture occurs, all touches on windows other than the window gaining capture need to be ignored until they are released. To do this, we fire a touch cancel for each of these touches. Generating Gesture EventsEach touch-id has an associated window (See GestureRecognizerImpl::touch_id_target_), and each window has an associated GestureProviderAura. GestureProviderAura contains a FilteredGestureProvider, which is responsible for performing gesture detection on both Android and Aura.
Where To Start
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