am b8145002: am 9f2532bf: Merge "Reduce false swipe-closed gestures in status... (59912d40) · Commits · e / os / android_frameworks_base

packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelView.java

+92 −2

Original line number	Diff line number	Diff line
		@@ -16,6 +16,10 @@

		package com.android.systemui.statusbar.phone;

		import java.util.ArrayDeque;
		import java.util.ArrayList;
		import java.util.Iterator;

		import android.animation.ObjectAnimator;
		import android.animation.TimeAnimator;
		import android.animation.TimeAnimator.TimeListener;
		@@ -73,7 +77,93 @@ public class PanelView extends FrameLayout {

		private TimeAnimator mTimeAnimator;
		private ObjectAnimator mPeekAnimator;
		private VelocityTracker mVelocityTracker;
		private FlingTracker mVelocityTracker;

		/**
		* A very simple low-pass velocity filter for motion events; not nearly as sophisticated as
		* VelocityTracker but optimized for the kinds of gestures we expect to see in status bar
		* panels.
		*/
		private static class FlingTracker {
		static final boolean DEBUG = false;
		final int MAX_EVENTS = 8;
		final float DECAY = 0.75f;
		ArrayDeque<MotionEventCopy> mEventBuf = new ArrayDeque<MotionEventCopy>(MAX_EVENTS);
		float mVX, mVY = 0;
		private static class MotionEventCopy {
		public MotionEventCopy(float x2, float y2, long eventTime) {
		this.x = x2;
		this.y = y2;
		this.t = eventTime;
		}
		public float x, y;
		public long t;
		}
		public FlingTracker() {
		}
		public void addMovement(MotionEvent event) {
		if (mEventBuf.size() == MAX_EVENTS) {
		mEventBuf.remove();
		}
		mEventBuf.add(new MotionEventCopy(event.getX(), event.getY(), event.getEventTime()));
		}
		public void computeCurrentVelocity(long timebase) {
		if (FlingTracker.DEBUG) {
		Slog.v("FlingTracker", "computing velocities for " + mEventBuf.size() + " events");
		}
		mVX = mVY = 0;
		MotionEventCopy last = null;
		int i = 0;
		float totalweight = 0f;
		float weight = 10f;
		for (final Iterator<MotionEventCopy> iter = mEventBuf.descendingIterator();
		iter.hasNext();) {
		final MotionEventCopy event = iter.next();
		if (last != null) {
		final float dt = (float) (event.t - last.t) / timebase;
		final float dx = (event.x - last.x);
		final float dy = (event.y - last.y);
		if (FlingTracker.DEBUG) {
		Slog.v("FlingTracker", String.format(" [%d] dx=%.1f dy=%.1f dt=%.0f vx=%.1f vy=%.1f",
		i,
		dx, dy, dt,
		(dx/dt),
		(dy/dt)
		));
		}
		mVX += weight * dx / dt;
		mVY += weight * dy / dt;
		totalweight += weight;
		weight *= DECAY;
		}
		last = event;
		i++;
		}
		mVX /= totalweight;
		mVY /= totalweight;

		if (FlingTracker.DEBUG) {
		Slog.v("FlingTracker", "computed: vx=" + mVX + " vy=" + mVY);
		}
		}
		public float getXVelocity() {
		return mVX;
		}
		public float getYVelocity() {
		return mVY;
		}
		public void recycle() {
		mEventBuf.clear();
		}

		static FlingTracker sTracker;
		static FlingTracker obtain() {
		if (sTracker == null) {
		sTracker = new FlingTracker();
		}
		return sTracker;
		}
		}

		private int[] mAbsPos = new int[2];
		PanelBar mBar;
		@@ -268,7 +358,7 @@ public class PanelView extends FrameLayout {
		mHandleView.setPressed(true);
		postInvalidate(); // catch the press state change
		mInitialTouchY = y;
		mVelocityTracker = VelocityTracker.obtain();
		mVelocityTracker = FlingTracker.obtain();
		trackMovement(event);
		mTimeAnimator.cancel(); // end any outstanding animations
		mBar.onTrackingStarted(PanelView.this);