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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.statusbar;
     18 
     19 import android.animation.Animator;
     20 import android.animation.AnimatorListenerAdapter;
     21 import android.animation.ValueAnimator;
     22 import android.content.Context;
     23 import android.graphics.Canvas;
     24 import android.graphics.Color;
     25 import android.graphics.PorterDuff;
     26 import android.util.AttributeSet;
     27 import android.view.View;
     28 import android.view.animation.Interpolator;
     29 
     30 /**
     31  * A view which can draw a scrim
     32  */
     33 public class ScrimView extends View
     34 {
     35     private int mScrimColor;
     36     private boolean mIsEmpty = true;
     37     private boolean mDrawAsSrc;
     38     private float mViewAlpha = 1.0f;
     39     private ValueAnimator mAlphaAnimator;
     40     private ValueAnimator.AnimatorUpdateListener mAlphaUpdateListener
     41             = new ValueAnimator.AnimatorUpdateListener() {
     42         @Override
     43         public void onAnimationUpdate(ValueAnimator animation) {
     44             mViewAlpha = (float) animation.getAnimatedValue();
     45             invalidate();
     46         }
     47     };
     48     private AnimatorListenerAdapter mClearAnimatorListener = new AnimatorListenerAdapter() {
     49         @Override
     50         public void onAnimationEnd(Animator animation) {
     51             mAlphaAnimator = null;
     52         }
     53     };
     54 
     55     public ScrimView(Context context) {
     56         this(context, null);
     57     }
     58 
     59     public ScrimView(Context context, AttributeSet attrs) {
     60         this(context, attrs, 0);
     61     }
     62 
     63     public ScrimView(Context context, AttributeSet attrs, int defStyleAttr) {
     64         this(context, attrs, defStyleAttr, 0);
     65     }
     66 
     67     public ScrimView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
     68         super(context, attrs, defStyleAttr, defStyleRes);
     69     }
     70 
     71     @Override
     72     protected void onDraw(Canvas canvas) {
     73         if (mDrawAsSrc || (!mIsEmpty && mViewAlpha > 0f)) {
     74             PorterDuff.Mode mode = mDrawAsSrc ? PorterDuff.Mode.SRC : PorterDuff.Mode.SRC_OVER;
     75             int color = mScrimColor;
     76             color = Color.argb((int) (Color.alpha(color) * mViewAlpha), Color.red(color),
     77                     Color.green(color), Color.blue(color));
     78             canvas.drawColor(color, mode);
     79         }
     80     }
     81 
     82     public void setDrawAsSrc(boolean asSrc) {
     83         mDrawAsSrc = asSrc;
     84         invalidate();
     85     }
     86 
     87     public void setScrimColor(int color) {
     88         if (color != mScrimColor) {
     89             mIsEmpty = Color.alpha(color) == 0;
     90             mScrimColor = color;
     91             invalidate();
     92         }
     93     }
     94 
     95     public int getScrimColor() {
     96         return mScrimColor;
     97     }
     98 
     99     @Override
    100     public boolean hasOverlappingRendering() {
    101         return false;
    102     }
    103 
    104     public void setViewAlpha(float alpha) {
    105         if (mAlphaAnimator != null) {
    106             mAlphaAnimator.cancel();
    107         }
    108         mViewAlpha = alpha;
    109         invalidate();
    110     }
    111 
    112     public void animateViewAlpha(float alpha, long durationOut, Interpolator interpolator) {
    113         if (mAlphaAnimator != null) {
    114             mAlphaAnimator.cancel();
    115         }
    116         mAlphaAnimator = ValueAnimator.ofFloat(mViewAlpha, alpha);
    117         mAlphaAnimator.addUpdateListener(mAlphaUpdateListener);
    118         mAlphaAnimator.addListener(mClearAnimatorListener);
    119         mAlphaAnimator.setInterpolator(interpolator);
    120         mAlphaAnimator.setDuration(durationOut);
    121         mAlphaAnimator.start();
    122     }
    123 }
    124