1/*
2 * Copyright (C) 2015 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 android.support.design.widget;
18
19import android.support.v4.view.animation.FastOutLinearInInterpolator;
20import android.support.v4.view.animation.FastOutSlowInInterpolator;
21import android.support.v4.view.animation.LinearOutSlowInInterpolator;
22import android.view.animation.Animation;
23import android.view.animation.DecelerateInterpolator;
24import android.view.animation.Interpolator;
25import android.view.animation.LinearInterpolator;
26
27class AnimationUtils {
28
29    static final Interpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
30    static final Interpolator FAST_OUT_SLOW_IN_INTERPOLATOR = new FastOutSlowInInterpolator();
31    static final Interpolator FAST_OUT_LINEAR_IN_INTERPOLATOR = new FastOutLinearInInterpolator();
32    static final Interpolator LINEAR_OUT_SLOW_IN_INTERPOLATOR = new LinearOutSlowInInterpolator();
33    static final Interpolator DECELERATE_INTERPOLATOR = new DecelerateInterpolator();
34
35    /**
36     * Linear interpolation between {@code startValue} and {@code endValue} by {@code fraction}.
37     */
38    static float lerp(float startValue, float endValue, float fraction) {
39        return startValue + (fraction * (endValue - startValue));
40    }
41
42    static int lerp(int startValue, int endValue, float fraction) {
43        return startValue + Math.round(fraction * (endValue - startValue));
44    }
45
46    static class AnimationListenerAdapter implements Animation.AnimationListener {
47        @Override
48        public void onAnimationStart(Animation animation) {
49        }
50
51        @Override
52        public void onAnimationEnd(Animation animation) {
53        }
54
55        @Override
56        public void onAnimationRepeat(Animation animation) {
57        }
58    }
59
60}
61