1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.systemui.volume;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.content.Context;
22import android.view.View;
23import android.view.animation.AnimationUtils;
24import android.view.animation.Interpolator;
25
26public class IconPulser {
27    private static final float PULSE_SCALE = 1.1f;
28
29    private final Interpolator mFastOutSlowInInterpolator;
30
31    public IconPulser(Context context) {
32        mFastOutSlowInInterpolator = AnimationUtils.loadInterpolator(context,
33                android.R.interpolator.fast_out_slow_in);
34    }
35
36    public void start(final View target) {
37        if (target == null || target.getScaleX() != 1) return;  // n/a, or already running
38        target.animate().cancel();
39        target.animate().scaleX(PULSE_SCALE).scaleY(PULSE_SCALE)
40                .setInterpolator(mFastOutSlowInInterpolator)
41                .setListener(new AnimatorListenerAdapter() {
42                    @Override
43                    public void onAnimationEnd(Animator animation) {
44                        target.animate().scaleX(1).scaleY(1).setListener(null);
45                    }
46                });
47    }
48}
49