Update status bar transition start time (3ea6b0ab) · Commits · e / os / android_frameworks_base

core/java/android/view/animation/TranslateAnimation.java

+58 −0

Original line number	Diff line number	Diff line
		@@ -57,6 +57,9 @@ public class TranslateAnimation extends Animation {
		/** @hide */
		protected float mToYDelta;

		private int mWidth;
		private int mParentWidth;

		/**
		* Constructor used when a TranslateAnimation is loaded from a resource.
		*
		@@ -179,5 +182,60 @@ public class TranslateAnimation extends Animation {
		mToXDelta = resolveSize(mToXType, mToXValue, width, parentWidth);
		mFromYDelta = resolveSize(mFromYType, mFromYValue, height, parentHeight);
		mToYDelta = resolveSize(mToYType, mToYValue, height, parentHeight);

		mWidth = width;
		mParentWidth = parentWidth;
		}

		/**
		* Checks whether or not the translation is exclusively an x axis translation.
		*
		* @hide
		*/
		public boolean isXAxisTransition() {
		return mFromXDelta - mToXDelta != 0 && mFromYDelta - mToYDelta == 0;
		}

		/**
		* Checks whether or not the translation is a full width x axis slide in or out translation.
		*
		* @hide
		*/
		public boolean isFullWidthTranslate() {
		boolean isXAxisSlideTransition =
		isSlideInLeft() \|\| isSlideOutRight() \|\| isSlideInRight() \|\| isSlideOutLeft();
		return mWidth == mParentWidth && isXAxisSlideTransition;
		}

		private boolean isSlideInLeft() {
		boolean startsOutOfParentOnLeft = mFromXDelta <= -mWidth;
		return startsOutOfParentOnLeft && endsXEnclosedWithinParent();
		}

		private boolean isSlideOutRight() {
		boolean endOutOfParentOnRight = mToXDelta >= mParentWidth;
		return startsXEnclosedWithinParent() && endOutOfParentOnRight;
		}

		private boolean isSlideInRight() {
		boolean startsOutOfParentOnRight = mFromXDelta >= mParentWidth;
		return startsOutOfParentOnRight && endsXEnclosedWithinParent();
		}

		private boolean isSlideOutLeft() {
		boolean endOutOfParentOnLeft = mToXDelta <= -mWidth;
		return startsXEnclosedWithinParent() && endOutOfParentOnLeft;
		}

		private boolean endsXEnclosedWithinParent() {
		return mWidth <= mParentWidth
		&& mToXDelta + mWidth <= mParentWidth
		&& mToXDelta >= 0;
		}

		private boolean startsXEnclosedWithinParent() {
		return mWidth <= mParentWidth
		&& mFromXDelta + mWidth <= mParentWidth
		&& mFromXDelta >= 0;
		}
		}

services/core/java/com/android/server/wm/WindowAnimationSpec.java

+46 −13

Original line number	Diff line number	Diff line
		@@ -125,16 +125,30 @@ public class WindowAnimationSpec implements AnimationSpec {
		@Override
		public long calculateStatusBarTransitionStartTime() {
		TranslateAnimation openTranslateAnimation = findTranslateAnimation(mAnimation);

		if (openTranslateAnimation != null) {
		if (openTranslateAnimation.isXAxisTransition()
		&& openTranslateAnimation.isFullWidthTranslate()) {
		// On X axis transitions that are fullscreen (heuristic for task like transitions)
		// we want the status bar to animate right in the middle of the translation when
		// the windows/tasks have each moved half way across.
		float t = findMiddleOfTranslationFraction(openTranslateAnimation.getInterpolator());

		return SystemClock.uptimeMillis()
		+ openTranslateAnimation.getStartOffset()
		+ (long) (openTranslateAnimation.getDuration() * t)
		- (long) (STATUS_BAR_TRANSITION_DURATION * 0.5);
		} else {
		// Some interpolators are extremely quickly mostly finished, but not completely. For
		// our purposes, we need to find the fraction for which ther interpolator is mostly
		// our purposes, we need to find the fraction for which their interpolator is mostly
		// there, and use that value for the calculation.
		float t = findAlmostThereFraction(openTranslateAnimation.getInterpolator());

		return SystemClock.uptimeMillis()
		+ openTranslateAnimation.getStartOffset()
		+ (long) (openTranslateAnimation.getDuration() * t)
		- STATUS_BAR_TRANSITION_DURATION;
		}
		} else {
		return SystemClock.uptimeMillis();
		}
		@@ -183,20 +197,39 @@ public class WindowAnimationSpec implements AnimationSpec {
		}

		/**
		* Binary searches for a {@code t} such that there exists a {@code -0.01 < eps < 0.01} for which
		* {@code interpolator(t + eps) > 0.99}.
		* Finds the fraction of the animation's duration at which the transition is almost done with a
		* maximal error of 0.01 when it is animated with {@code interpolator}.
		*/
		private static float findAlmostThereFraction(Interpolator interpolator) {
		return findInterpolationAdjustedTargetFraction(interpolator, 0.99f, 0.01f);
		}

		/**
		* Finds the fraction of the animation's duration at which the transition is spacially half way
		* done with a maximal error of 0.01 when it is animated with {@code interpolator}.
		*/
		private float findMiddleOfTranslationFraction(Interpolator interpolator) {
		return findInterpolationAdjustedTargetFraction(interpolator, 0.5f, 0.01f);
		}

		/**
		* Binary searches for a {@code val} such that there exists an {@code -0.01 < epsilon < 0.01}
		* for which {@code interpolator(val + epsilon) > target}.
		*/
		private static float findInterpolationAdjustedTargetFraction(
		Interpolator interpolator, float target, float epsilon) {
		float val = 0.5f;
		float adj = 0.25f;
		while (adj >= 0.01f) {
		if (interpolator.getInterpolation(val) < 0.99f) {

		while (adj >= epsilon) {
		if (interpolator.getInterpolation(val) < target) {
		val += adj;
		} else {
		val -= adj;
		}
		adj /= 2;
		}

		return val;
		}