RevealVisibilityTransition.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.hannesdorfmann.mosby3.sample.mail.ui.transition;

import android.animation.Animator;
import android.animation.TimeInterpolator;
import android.annotation.TargetApi;
import android.content.Context;
import android.transition.TransitionValues;
import android.transition.Visibility;
import android.util.ArrayMap;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewAnimationUtils;
import android.view.ViewGroup;
import java.util.ArrayList;

@TargetApi(21)
public class RevealVisibilityTransition extends Visibility {
    public RevealVisibilityTransition() {
    }

    public RevealVisibilityTransition(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public Animator onAppear(ViewGroup sceneRoot, final View view, TransitionValues startValues,
                             TransitionValues endValues) {

        Animator reveal = ViewAnimationUtils.createCircularReveal(view, 140, 200,
            0, 1000);
        return new NoPauseAnimator(reveal);

    }

    @Override
    public Animator onDisappear(ViewGroup sceneRoot, View view, TransitionValues startValues,
                                TransitionValues endValues) {

        Animator reveal = ViewAnimationUtils.createCircularReveal(view, 140, 200,
           1000, 0);
        return new NoPauseAnimator(reveal);

    }

    private Animator createAnimator(View view, float startRadius, float endRadius) {
        int centerX = view.getWidth() / 2;
        int centerY = view.getHeight() / 2;

        Animator reveal = ViewAnimationUtils.createCircularReveal(view, centerX, centerY,
                startRadius, endRadius);
        return new NoPauseAnimator(reveal);
    }

    static double calculateMaxRadius(View view) {
        double widthSquared = view.getWidth() * view.getWidth();
        double heightSquared = view.getHeight() * view.getHeight();
        double radius = Math.sqrt(widthSquared + heightSquared) / 2;
        return radius;
    }

    private static class NoPauseAnimator extends Animator {
        private final Animator mAnimator;
        private final ArrayMap<AnimatorListener, AnimatorListener> mListeners =
                new ArrayMap<AnimatorListener, AnimatorListener>();

        public NoPauseAnimator(Animator animator) {
            mAnimator = animator;
        }

        @Override
        public void addListener(AnimatorListener listener) {
            AnimatorListener wrapper = new AnimatorListenerWrapper(this, listener);
            if (!mListeners.containsKey(listener)) {
                mListeners.put(listener, wrapper);
                mAnimator.addListener(wrapper);
            }
        }

        @Override
        public void cancel() {
            mAnimator.cancel();
        }

        @Override
        public void end() {
            mAnimator.end();
        }

        @Override
        public long getDuration() {
            return mAnimator.getDuration();
        }

        @Override
        public TimeInterpolator getInterpolator() {
            return mAnimator.getInterpolator();
        }

        @Override
        public ArrayList<AnimatorListener> getListeners() {
            return new ArrayList<AnimatorListener>(mListeners.keySet());
        }

        @Override
        public long getStartDelay() {
            return mAnimator.getStartDelay();
        }

        @Override
        public boolean isPaused() {
            return mAnimator.isPaused();
        }

        @Override
        public boolean isRunning() {
            return mAnimator.isRunning();
        }

        @Override
        public boolean isStarted() {
            return mAnimator.isStarted();
        }

        @Override
        public void removeAllListeners() {
            mListeners.clear();
            mAnimator.removeAllListeners();
        }

        @Override
        public void removeListener(AnimatorListener listener) {
            AnimatorListener wrapper = mListeners.get(listener);
            if (wrapper != null) {
                mListeners.remove(listener);
                mAnimator.removeListener(wrapper);
            }
        }

        /* We don't want to override pause or resume methods because we don't want them
         * to affect mAnimator.
        public void pause();

        public void resume();

        public void addPauseListener(AnimatorPauseListener listener);

        public void removePauseListener(AnimatorPauseListener listener);
        */

        @Override
        public Animator setDuration(long durationMS) {
            mAnimator.setDuration(durationMS);
            return this;
        }

        @Override
        public void setInterpolator(TimeInterpolator timeInterpolator) {
            mAnimator.setInterpolator(timeInterpolator);
        }

        @Override
        public void setStartDelay(long delayMS) {
            mAnimator.setStartDelay(delayMS);
        }

        @Override
        public void setTarget(Object target) {
            mAnimator.setTarget(target);
        }

        @Override
        public void setupEndValues() {
            mAnimator.setupEndValues();
        }

        @Override
        public void setupStartValues() {
            mAnimator.setupStartValues();
        }

        @Override
        public void start() {
            mAnimator.start();
        }
    }

    private static class AnimatorListenerWrapper implements Animator.AnimatorListener {
        private final Animator mAnimator;
        private final Animator.AnimatorListener mListener;

        public AnimatorListenerWrapper(Animator animator, Animator.AnimatorListener listener) {
            mAnimator = animator;
            mListener = listener;
        }

        @Override
        public void onAnimationStart(Animator animator) {
            mListener.onAnimationStart(mAnimator);
        }

        @Override
        public void onAnimationEnd(Animator animator) {
            mListener.onAnimationEnd(mAnimator);
        }

        @Override
        public void onAnimationCancel(Animator animator) {
            mListener.onAnimationCancel(mAnimator);
        }

        @Override
        public void onAnimationRepeat(Animator animator) {
            mListener.onAnimationRepeat(mAnimator);
        }
    }
}