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      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 
     17 package com.android.systemui;
     18 
     19 import android.animation.Animator;
     20 import android.animation.AnimatorListenerAdapter;
     21 import android.animation.ValueAnimator;
     22 import android.graphics.ColorMatrix;
     23 import android.graphics.ColorMatrixColorFilter;
     24 import android.graphics.Paint;
     25 import android.view.View;
     26 import android.view.animation.AnimationUtils;
     27 import android.view.animation.Interpolator;
     28 
     29 /**
     30  * Helper to invert the colors of views and fade between the states.
     31  */
     32 public class ViewInvertHelper {
     33 
     34     private final Paint mDarkPaint = new Paint();
     35     private final Interpolator mLinearOutSlowInInterpolator;
     36     private final View mTarget;
     37     private final ColorMatrix mMatrix = new ColorMatrix();
     38     private final ColorMatrix mGrayscaleMatrix = new ColorMatrix();
     39     private final long mFadeDuration;
     40 
     41     public ViewInvertHelper(View target, long fadeDuration) {
     42         mTarget = target;
     43         mLinearOutSlowInInterpolator = AnimationUtils.loadInterpolator(mTarget.getContext(),
     44                 android.R.interpolator.linear_out_slow_in);
     45         mFadeDuration = fadeDuration;
     46     }
     47 
     48     public void fade(final boolean invert, long delay) {
     49         float startIntensity = invert ? 0f : 1f;
     50         float endIntensity = invert ? 1f : 0f;
     51         ValueAnimator animator = ValueAnimator.ofFloat(startIntensity, endIntensity);
     52         animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
     53             @Override
     54             public void onAnimationUpdate(ValueAnimator animation) {
     55                 updateInvertPaint((Float) animation.getAnimatedValue());
     56                 mTarget.setLayerType(View.LAYER_TYPE_HARDWARE, mDarkPaint);
     57             }
     58         });
     59         animator.addListener(new AnimatorListenerAdapter() {
     60             @Override
     61             public void onAnimationEnd(Animator animation) {
     62                 if (!invert) {
     63                     mTarget.setLayerType(View.LAYER_TYPE_NONE, null);
     64                 }
     65             }
     66         });
     67         animator.setDuration(mFadeDuration);
     68         animator.setInterpolator(mLinearOutSlowInInterpolator);
     69         animator.setStartDelay(delay);
     70         animator.start();
     71     }
     72 
     73     public void update(boolean invert) {
     74         if (invert) {
     75             updateInvertPaint(1f);
     76             mTarget.setLayerType(View.LAYER_TYPE_HARDWARE, mDarkPaint);
     77         } else {
     78             mTarget.setLayerType(View.LAYER_TYPE_NONE, null);
     79         }
     80     }
     81 
     82     public View getTarget() {
     83         return mTarget;
     84     }
     85 
     86     private void updateInvertPaint(float intensity) {
     87         float components = 1 - 2 * intensity;
     88         final float[] invert = {
     89                 components, 0f,         0f,         0f, 255f * intensity,
     90                 0f,         components, 0f,         0f, 255f * intensity,
     91                 0f,         0f,         components, 0f, 255f * intensity,
     92                 0f,         0f,         0f,         1f, 0f
     93         };
     94         mMatrix.set(invert);
     95         mGrayscaleMatrix.setSaturation(1 - intensity);
     96         mMatrix.preConcat(mGrayscaleMatrix);
     97         mDarkPaint.setColorFilter(new ColorMatrixColorFilter(mMatrix));
     98     }
     99 }