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TouchDelegate

public class TouchDelegate
extends Object

java.lang.Object
   ↳ android.view.TouchDelegate


Helper class to handle situations where you want a view to have a larger touch area than its actual view bounds. The view whose touch area is changed is called the delegate view. This class should be used by an ancestor of the delegate. To use a TouchDelegate, first create an instance that specifies the bounds that should be mapped to the delegate and the delegate view itself.

The ancestor should then forward all of its touch events received in its View.onTouchEvent(MotionEvent) to onTouchEvent(MotionEvent).

Summary

Constants

int ABOVE

The touchable region of the View extends above its actual extent.

int BELOW

The touchable region of the View extends below its actual extent.

int TO_LEFT

The touchable region of the View extends to the left of its actual extent.

int TO_RIGHT

The touchable region of the View extends to the right of its actual extent.

Public constructors

TouchDelegate(Rect bounds, View delegateView)

Constructor

Public methods

boolean onTouchEvent(MotionEvent event)

Will forward touch events to the delegate view if the event is within the bounds specified in the constructor.

Inherited methods

Constants

ABOVE

added in API level 1
public static final int ABOVE

The touchable region of the View extends above its actual extent.

Constant Value: 1 (0x00000001)

BELOW

added in API level 1
public static final int BELOW

The touchable region of the View extends below its actual extent.

Constant Value: 2 (0x00000002)

TO_LEFT

added in API level 1
public static final int TO_LEFT

The touchable region of the View extends to the left of its actual extent.

Constant Value: 4 (0x00000004)

TO_RIGHT

added in API level 1
public static final int TO_RIGHT

The touchable region of the View extends to the right of its actual extent.

Constant Value: 8 (0x00000008)

Public constructors

TouchDelegate

added in API level 1
public TouchDelegate (Rect bounds, 
                View delegateView)

Constructor

Parameters
bounds Rect: Bounds in local coordinates of the containing view that should be mapped to the delegate view

delegateView View: The view that should receive motion events

Public methods

onTouchEvent

added in API level 1
public boolean onTouchEvent (MotionEvent event)

Will forward touch events to the delegate view if the event is within the bounds specified in the constructor.

Parameters
event MotionEvent: The touch event to forward

Returns
boolean True if the event was forwarded to the delegate, false otherwise.