diff options
| -rw-r--r-- | app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java b/app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java index c41687b0..ff2adf5a 100644 --- a/app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java +++ b/app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java @@ -6,13 +6,19 @@ package com.wireguard.android.widget.fab; +import android.animation.Animator; +import android.animation.AnimatorListenerAdapter; +import android.animation.TimeInterpolator; +import android.animation.ValueAnimator; import android.content.Context; import android.support.design.widget.CoordinatorLayout; import android.support.design.widget.Snackbar; +import android.support.v4.view.animation.FastOutSlowInInterpolator; import android.util.AttributeSet; import android.view.View; public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FloatingActionsMenu> { + public FloatingActionButtonBehavior(final Context context, final AttributeSet attrs) { super(context, attrs); } @@ -23,17 +29,39 @@ public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<Flo return dependency instanceof Snackbar.SnackbarLayout; } + private static final long ANIMATION_DURATION = 250; + private static final TimeInterpolator FAST_OUT_SLOW_IN_INTERPOLATOR = new FastOutSlowInInterpolator(); + + private static void animateChange(final FloatingActionsMenu child, final float destination, final float fullSpan) { + final float origin = child.getBehaviorYTranslation(); + if (Math.abs(destination - origin) < fullSpan / 2) { + child.setBehaviorYTranslation(destination); + return; + } + final ValueAnimator animator = new ValueAnimator(); + animator.setFloatValues(origin, destination); + animator.setInterpolator(FAST_OUT_SLOW_IN_INTERPOLATOR); + animator.setDuration((long)(ANIMATION_DURATION * (Math.abs(destination - origin) / fullSpan))); + animator.addListener(new AnimatorListenerAdapter() { + @Override + public void onAnimationEnd(final Animator a) { + child.setBehaviorYTranslation(destination); + } + }); + animator.addUpdateListener(a -> child.setBehaviorYTranslation((float)a.getAnimatedValue())); + animator.start(); + } + @Override public boolean onDependentViewChanged(final CoordinatorLayout parent, final FloatingActionsMenu child, final View dependency) { - child.setBehaviorYTranslation(Math.min(0, dependency.getTranslationY() - dependency.getMeasuredHeight())); + animateChange(child, Math.min(0, dependency.getTranslationY() - dependency.getMeasuredHeight()), dependency.getMeasuredHeight()); return true; } @Override - public void onDependentViewRemoved(final CoordinatorLayout parent, FloatingActionsMenu child, + public void onDependentViewRemoved(final CoordinatorLayout parent, final FloatingActionsMenu child, final View dependency) { - // TODO(msf): animate this so it isn't so dramatic when the snackbar is swiped away - child.setBehaviorYTranslation(0); + animateChange(child, 0, dependency.getMeasuredHeight()); } } |