Apply max scroll velocity to QC (820dbff1) · Commits · e / os / android_packages_apps_Contacts

src/com/android/contacts/widget/MultiShrinkScroller.java

+11 −1

Original line number	Diff line number	Diff line
		@@ -84,6 +84,11 @@ public class MultiShrinkScroller extends FrameLayout {
		*/
		private static final float INTERMEDIATE_HEADER_HEIGHT_RATIO = 0.5f;

		/**
		* Maximum velocity for flings in dips per second. Picked via non-rigorous experimentation.
		*/
		private static final float MAXIMUM_FLING_VELOCITY = 2000;

		private float[] mLastEventPosition = { 0, 0 };
		private VelocityTracker mVelocityTracker;
		private boolean mIsBeingDragged = false;
		@@ -242,7 +247,9 @@ public class MultiShrinkScroller extends FrameLayout {
		mScroller = new Scroller(context, sInterpolator);
		mTouchSlop = configuration.getScaledTouchSlop();
		mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
		mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
		mMaximumVelocity = (int)TypedValue.applyDimension(
		TypedValue.COMPLEX_UNIT_DIP, MAXIMUM_FLING_VELOCITY,
		getResources().getDisplayMetrics());
		mTransparentStartHeight = (int) getResources().getDimension(
		R.dimen.quickcontact_starting_empty_height);
		mToolbarElevation = getResources().getDimension(
		@@ -839,6 +846,9 @@ public class MultiShrinkScroller extends FrameLayout {
		}

		private void fling(float velocity) {
		if (Math.abs(mMaximumVelocity) < Math.abs(velocity)) {
		velocity = -mMaximumVelocity * Math.signum(velocity);
		}
		// For reasons I do not understand, scrolling is less janky when maxY=Integer.MAX_VALUE
		// then when maxY is set to an actual value.
		mScroller.fling(0, getScroll(), 0, (int) velocity, 0, 0, -Integer.MAX_VALUE,