Package com.sencha.gxt.core.client.gestures

Interface GestureRecognizer

All Known Implementing Classes:

AbstractGestureRecognizer, AbstractTwoTouchGestureRecognizer, DoubleTapGestureRecognizer, DragGestureRecognizer, GestureChain, LongPressOrTapGestureRecognizer, PinchAndRotateGestureRecognizer, ScrollGestureRecognizer, TapGestureRecognizer

public interface GestureRecognizer

External api for mangling touch events into gestures (events or callbacks). The handle() method accepts incoming dom events, getTouches() returns the current set of touches this gesture is handling, and cancel() releases the current touches so that other handlers can deal with them.

Various implementations of this can either support on- methods or events to indicate that touch events or gestures are ongoing or have completed. Events are generally expected to be fired from any provided delegate rather than this object itself.

Method Summary

Modifier and Type	Method	Description
void	cancel()	Ends recognition of the gesture, and fires any cancel events that apply.
List<TouchData>	getTouches()	Gets all actively recognized touches that are being recognized by this gesture.
boolean	handle(com.google.gwt.dom.client.NativeEvent event)	Takes a browser event, and checks to see if it should decipher a gesture from it.
void	setDelegate(com.google.gwt.event.shared.HasHandlers eventDelegate)	Sets delegate to receive Gesture events
void	start(List<TouchData> touches)	Artificially starts a gesture

Method Detail

cancel

void cancel()

Ends recognition of the gesture, and fires any cancel events that apply. Any touch events being recognized by this object will now be ignored.

getTouches

List<TouchData> getTouches()

Gets all actively recognized touches that are being recognized by this gesture.

Returns:

the touches

handle

boolean handle(com.google.gwt.dom.client.NativeEvent event)

Takes a browser event, and checks to see if it should decipher a gesture from it.

Callers of this are expected to do their own vetting to decide if the given event should be handled by this gesture - for example, if a cell accepts a tap on one part of it and a longpress on another, the cell should determine where the touch events occur and send to the right recognizer accordingly.

Parameters:

event - the browser event to read for a gesture.

Returns:

true if the gesture is not handling the event and can allow it to be propagated, false to indicate that it has been handled and should not be given to other handlers. Should always return true for any start event.

setDelegate

void setDelegate(com.google.gwt.event.shared.HasHandlers eventDelegate)

Sets delegate to receive Gesture events

Parameters:

eventDelegate - the event handler delegate

start

void start(List<TouchData> touches)

Artificially starts a gesture

Parameters:

touches - the touches to be started