package com.reactnativenavigation.views; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.support.design.widget.FloatingActionButton; import android.view.View; import java.util.List; public class FloatingActionButtonAnimator { private final FloatingActionButton collapsedFab; private final FloatingActionButton expendedFab; private int crossFadeAnimationDuration; private enum State{Showing, Idle, Removing} private State state = State.Idle; public FloatingActionButtonAnimator(FloatingActionButton collapsedFab, FloatingActionButton expendedFab, int crossFadeAnimationDuration) { this.collapsedFab = collapsedFab; this.expendedFab = expendedFab; this.crossFadeAnimationDuration = crossFadeAnimationDuration; } boolean isAnimating() { return state == State.Showing || state == State.Removing; } void show() { state = State.Showing; collapsedFab.setScaleX(0); collapsedFab.setScaleY(0); collapsedFab.animate() .alpha(1) .scaleX(1) .scaleY(1) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { state = State.Idle; } }) .setDuration(crossFadeAnimationDuration) .start(); } public void collapse() { hideExpended(); showCollapsed(); } void hideCollapsed() { animateFab(collapsedFab, 0, 90); } void showExpended() { animateFab(expendedFab, 1, 0); } void showCollapsed() { animateFab(collapsedFab, 1, 0); } void hideExpended() { animateFab(expendedFab, 0, -90); } private void animateFab(final FloatingActionButton fab, final int alpha, int rotation) { fab.animate() .alpha(alpha) .setDuration(crossFadeAnimationDuration) .rotation(rotation) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationStart(Animator animation) { if (fab.getVisibility() == View.GONE) { fab.setVisibility(View.VISIBLE); } } @Override public void onAnimationEnd(Animator animation) { fab.setVisibility(alpha == 0 ? View.GONE : View.VISIBLE); } }) .start(); } void removeFabFromScreen(FloatingActionButton fab, final AnimatorListenerAdapter animationListener) { if (fab == null) { return; } state = State.Removing; fab.animate() .alpha(0) .scaleX(0) .scaleY(0) .setDuration(crossFadeAnimationDuration) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { if (animationListener != null) { animationListener.onAnimationEnd(animation); } } }) .start(); } void removeActionsFromScreen(List actions) { for (FloatingActionButton action : actions) { action.animate() .alpha(0) .scaleX(0) .scaleY(0) .setDuration(crossFadeAnimationDuration) .start(); } } }