UIBlockExtensions.AddGestureHandler

Subscribe to a gesture event on this UIBlock's descendant hierarchy (inclusive of this UIBlock), filtered to the given ItemVisuals type, TVisuals.

Remarks

The subscription only "lives" on this UIBlock, but the event will propagate up from descendents triggering gesture events with an gestureHandler type-matched signature.

Declaration

public static void AddGestureHandler<TGesture, TVisuals>(this UIBlock uiBlock, UIEventHandler<TGesture, TVisuals> gestureHandler)
    where TGesture : struct, IGestureEvent where TVisuals : ItemVisuals

Parameters

Type	Name	Description
UIBlock	uiBlock
UIEventHandler<TGesture, TVisuals>	gestureHandler	The callback invoked when the event fires.

Type Parameters

Name	Description
TGesture	The type of gesture event to handle.
TVisuals	The ItemVisuals type to target as the event propagates. If no object of this type is in the event propogation path, the `gestureHandler` won't be invoked.

Exceptions

Type	Condition
System.ArgumentNullException	If `uiBlock` or `gestureHandler` is `null`.