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FloatingActionButtonBehavior: animate transitions

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-07-29 16:43:19 +02:00
parent db7b61ab80
commit 6558140a7c
1 changed files with 32 additions and 4 deletions
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36
app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButtonBehavior.java
View File

@ -6,13 +6,19 @@
package com.wireguard.android.widget.fab; 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.content.Context;
import android.support.design.widget.CoordinatorLayout; import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar; import android.support.design.widget.Snackbar;
import android.support.v4.view.animation.FastOutSlowInInterpolator;
import android.util.AttributeSet; import android.util.AttributeSet;
import android.view.View; import android.view.View;
public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FloatingActionsMenu> { public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FloatingActionsMenu> {
public FloatingActionButtonBehavior(final Context context, final AttributeSet attrs) { public FloatingActionButtonBehavior(final Context context, final AttributeSet attrs) {
super(context, attrs); super(context, attrs);
} }
@ -23,17 +29,39 @@ public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<Flo
return dependency instanceof Snackbar.SnackbarLayout; 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 @Override
public boolean onDependentViewChanged(final CoordinatorLayout parent, final FloatingActionsMenu child, public boolean onDependentViewChanged(final CoordinatorLayout parent, final FloatingActionsMenu child,
final View dependency) { 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; return true;
} }
@Override @Override
public void onDependentViewRemoved(final CoordinatorLayout parent, FloatingActionsMenu child, public void onDependentViewRemoved(final CoordinatorLayout parent, final FloatingActionsMenu child,
final View dependency) { final View dependency) {
// TODO(msf): animate this so it isn't so dramatic when the snackbar is swiped away animateChange(child, 0, dependency.getMeasuredHeight());
child.setBehaviorYTranslation(0);
} }
} }