com.facebook.react.uimanager

Class TouchTargetHelper

java.lang.Object

com.facebook.react.uimanager.TouchTargetHelper

public class TouchTargetHelper
extends java.lang.Object

Class responsible for identifying which react view should handle a given MotionEvent. It uses the event coordinates to traverse the view hierarchy and return a suitable view.

Constructor Summary

Constructors

Constructor and Description
TouchTargetHelper()

Method Summary

Methods

Modifier and Type	Method and Description
static int	findTargetTagAndCoordinatesForTouch(float eventY, float eventX, android.view.ViewGroup viewGroup, float[] viewCoords) Find touch event target view within the provided container given the coordinates provided via MotionEvent.
static int	findTargetTagForTouch(float eventY, float eventX, android.view.ViewGroup viewGroup) Find touch event target view within the provided container given the coordinates provided via MotionEvent.

Methods inherited from class java.lang.Object

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

Constructor Detail

TouchTargetHelper

public TouchTargetHelper()

Method Detail

findTargetTagForTouch

public static int findTargetTagForTouch(float eventY,
                        float eventX,
                        android.view.ViewGroup viewGroup)

Find touch event target view within the provided container given the coordinates provided via MotionEvent.

Parameters:

eventY - the Y screen coordinate of the touch location

eventX - the X screen coordinate of the touch location

viewGroup - the container view to traverse

Returns:

the react tag ID of the child view that should handle the event

findTargetTagAndCoordinatesForTouch

public static int findTargetTagAndCoordinatesForTouch(float eventY,
                                      float eventX,
                                      android.view.ViewGroup viewGroup,
                                      float[] viewCoords)

Find touch event target view within the provided container given the coordinates provided via MotionEvent.

Parameters:

eventY - the Y screen coordinate of the touch location

eventX - the X screen coordinate of the touch location

viewGroup - the container view to traverse

viewCoords - an out parameter that will return the Y,X value in the target view

Returns:

the react tag ID of the child view that should handle the event