Package ej.widget.event

Class PointerEventHandler

java.lang.Object

ej.widget.event.PointerEventHandler

All Implemented Interfaces:

EventHandler

Direct Known Subclasses:

ClickEventHandler, SwipeEventHandler

public abstract class PointerEventHandler
extends Object
implements EventHandler

Abstract pointer event handler.

It can be used as base class for event handlers compatible with PointerEventDispatcher semantic.

Since:

3.5.0

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PointerEventHandler(Widget widget)	Instantiates the handler for the given widget.

Method Summary

Modifier and Type	Method	Description
boolean	handleEvent(int event)	Handles an event.
protected boolean	onDragged(int pointerX, int pointerY)	Returns false by default.
protected void	onExited()	Does nothing by default.
protected boolean	onPressed(int pointerX, int pointerY)	Returns false by default.
protected boolean	onReleased(int pointerX, int pointerY)	Returns false by default.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PointerEventHandler

protected PointerEventHandler(Widget widget)

Instantiates the handler for the given widget.

Parameters:

widget - the attached widget.

Method Detail

handleEvent

public final boolean handleEvent(int event)

Description copied from interface: EventHandler

Handles an event.

Specified by:

handleEvent in interface EventHandler

Parameters:

event - the event to handle.

Returns:

true if the event is consumed, false otherwise.

See Also:

Event

onPressed

protected boolean onPressed(int pointerX,
                            int pointerY)

Returns false by default.

Override this method to react on PRESSED events.
Returns true to get event focus. Other widgets will no longer receive pointer events until next RELEASED.

Parameters:

pointerX - the Pointer event X, relative to the attached widget.

pointerY - the Pointer event Y, relative to the attached widget.

Returns:

true if the event has been processed, false if it should be dispatched to other handlers.

onDragged

protected boolean onDragged(int pointerX,
                            int pointerY)

Returns false by default.

Override this method to react on DRAGGED events.
Returns true to get event focus. Other widgets will no longer receive pointer events until next RELEASED.

Parameters:

pointerX - the Pointer event X, relative to the attached widget.

pointerY - the Pointer event Y, relative to the attached widget.

Returns:

true if the event has been processed, false if it should be dispatched to other handlers.

onReleased

protected boolean onReleased(int pointerX,
                             int pointerY)

Returns false by default.

Override this method to react on RELEASED events.
Returns true to prevent other widgets to also handle this event.

Parameters:

pointerX - the Pointer event X, relative to the attached widget.

pointerY - the Pointer event Y, relative to the attached widget.

Returns:

true if the event has been processed, false if it should be dispatched to other handlers.

onExited

protected void onExited()

Does nothing by default.

Override this method to react on focus loss events.