Fix bug 2988160 - Flinging broken in certain apps/widgets (8ae0f3f6) · Commits · e / os / android_frameworks_base

core/java/android/view/VelocityTracker.java

+16 −2

Original line number	Diff line number	Diff line
		@@ -41,6 +41,7 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		private static final int MAX_AGE_MILLISECONDS = 200;

		private static final int POINTER_POOL_CAPACITY = 20;
		private static final int INVALID_POINTER = -1;

		private static final Pool<VelocityTracker> sPool = Pools.synchronizedPool(
		Pools.finitePool(new PoolableManager<VelocityTracker>() {
		@@ -76,6 +77,7 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		private Pointer mPointerListHead; // sorted by id in increasing order
		private int mLastTouchIndex;
		private int mGeneration;
		private int mActivePointerId;

		private VelocityTracker mNext;

		@@ -125,6 +127,7 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {

		mPointerListHead = null;
		mLastTouchIndex = 0;
		mActivePointerId = INVALID_POINTER;
		}

		/**
		@@ -180,6 +183,10 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		// Pointer went down. Add it to the list.
		// Write a sentinel at the end of the pastTime trace so we will be able to
		// tell when the trace started.
		if (mActivePointerId == INVALID_POINTER) {
		// Congratulations! You're the new active pointer!
		mActivePointerId = pointerId;
		}
		pointer = obtainPointer();
		pointer.id = pointerId;
		pointer.pastTime[lastTouchIndex] = Long.MIN_VALUE;
		@@ -214,6 +221,7 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		previousPointer = null;
		for (Pointer pointer = mPointerListHead; pointer != null; ) {
		final Pointer nextPointer = pointer.next;
		final int pointerId = pointer.id;
		if (pointer.generation != generation) {
		// Pointer went up. Remove it from the list.
		if (previousPointer == null) {
		@@ -222,6 +230,12 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		previousPointer.next = nextPointer;
		}
		releasePointer(pointer);

		if (pointerId == mActivePointerId) {
		// Pick a new active pointer. How is arbitrary.
		mActivePointerId = mPointerListHead != null ?
		mPointerListHead.id : INVALID_POINTER;
		}
		} else {
		previousPointer = pointer;
		}
		@@ -334,7 +348,7 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		* @return The previously computed X velocity.
		*/
		public float getXVelocity() {
		Pointer pointer = getPointer(0);
		Pointer pointer = getPointer(mActivePointerId);
		return pointer != null ? pointer.xVelocity : 0;
		}

		@@ -345,7 +359,7 @@ public final class VelocityTracker implements Poolable<VelocityTracker> {
		* @return The previously computed Y velocity.
		*/
		public float getYVelocity() {
		Pointer pointer = getPointer(0);
		Pointer pointer = getPointer(mActivePointerId);
		return pointer != null ? pointer.yVelocity : 0;
		}