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Commit 2b342f0a authored by Adam Powell's avatar Adam Powell
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Allow ViewGroup to split MotionEvents to multiple targets during dispatch. 

Use the layout xml attribute splitMotionEvents="true" or the ViewGroup
method setMotionEventSplittingEnabled(true) to enable motion event
splitting. Rules for splitting are as follows:

* Splitting is enabled per ViewGroup. When splitting is enabled any
  MotionEvent dispatched to that ViewGroup can potentially be split
  into several and dispatched to children independently.

* Each pointer is assigned a target child view when the ACTION_DOWN or
  ACTION_POINTER_DOWN event is received. That will be the pointer's
  target until it goes up, the target returns false from onTouchEvent,
  or the MotionEvents are intercepted.

* Multiple pointers may be assigned to the same target. All pointer
  data sent to a target are bundled into a single MotionEvent. Child
  views do not need to be aware that splitting has occurred.

Change-Id: I993f838e2f6b455da9812f4742a016dfcd1c4cc9
parent 8a44bb23

api/current.xml

+35 −0
Original line number Diff line number Diff line
@@ -8919,6 +8919,17 @@ 
 visibility="public"

>

</field>

<field name="splitMotionEvents"

 type="int"

 transient="false"

 volatile="false"

 value="16843567"

 static="true"

 final="true"

 deprecated="not deprecated"

 visibility="public"

>

</field>

<field name="src"

 type="int"

 transient="false"
@@ -199360,6 +199371,17 @@ 
 visibility="protected"

>

</method>

<method name="isMotionEventSplittingEnabled"

 return="boolean"

 abstract="false"

 native="false"

 synchronized="false"

 static="false"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

</method>

<method name="measureChild"

 return="void"

 abstract="false"
@@ -199823,6 +199845,19 @@ 
<parameter name="animationListener" type="android.view.animation.Animation.AnimationListener">

</parameter>

</method>

<method name="setMotionEventSplittingEnabled"

 return="void"

 abstract="false"

 native="false"

 synchronized="false"

 static="false"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

<parameter name="split" type="boolean">

</parameter>

</method>

<method name="setOnHierarchyChangeListener"

 return="void"

 abstract="false"

core/java/android/view/View.java

+1 −33
Original line number Diff line number Diff line
@@ -16,7 +16,6 @@ 


package android.view;



import android.graphics.Camera;

import com.android.internal.R;

import com.android.internal.view.menu.MenuBuilder;
@@ -25,6 +24,7 @@ import android.content.res.Configuration; 
import android.content.res.Resources;

import android.content.res.TypedArray;

import android.graphics.Bitmap;

import android.graphics.Camera;

import android.graphics.Canvas;

import android.graphics.Interpolator;

import android.graphics.LinearGradient;
@@ -69,7 +69,6 @@ import android.view.inputmethod.InputConnection; 
import android.view.inputmethod.InputMethodManager;

import android.widget.ScrollBarDrawable;



import java.lang.ref.SoftReference;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.ArrayList;
@@ -5418,37 +5417,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback, Accessibility 
        }

    }



    /**

     * This method detects whether the given event is inside the view and, if so,

     * handles it via the dispatchEvent(MotionEvent) method.

     *

     * @param ev The event that is being dispatched.

     * @param parentX The x location of the event in the parent's coordinates.

     * @param parentY The y location of the event in the parent's coordinates.

     * @return true if the event was inside this view, false otherwise.

     */

    boolean dispatchTouchEvent(MotionEvent ev, float parentX, float parentY) {

        float localX = parentX - mLeft;

        float localY = parentY - mTop;

        if (!hasIdentityMatrix() && mAttachInfo != null) {

            // non-identity matrix: transform the point into the view's coordinates

            final float[] localXY = mAttachInfo.mTmpTransformLocation;

            localXY[0] = localX;

            localXY[1] = localY;

            getInverseMatrix().mapPoints(localXY);

            localX = localXY[0];

            localY = localXY[1];

        }

        if (localX >= 0 && localY >= 0 && localX < (mRight - mLeft) && localY < (mBottom - mTop)) {

            // It would be safer to clone the event here but we don't for performance.

            // There are many subtle interactions in touch event dispatch; change at your own risk.

            mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT;

            ev.setLocation(localX, localY);

            return dispatchTouchEvent(ev);

        }

        return false;

    }



    /**

     * Utility method to determine whether the given point, in local coordinates,

     * is inside the view, where the area of the view is expanded by the slop factor.