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      1 /*
      2  * Copyright (C) 2016 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.stackdivider;
     18 
     19 import android.annotation.Nullable;
     20 import android.content.Context;
     21 import android.graphics.Canvas;
     22 import android.graphics.Color;
     23 import android.graphics.LinearGradient;
     24 import android.graphics.Paint;
     25 import android.graphics.Shader;
     26 import android.util.AttributeSet;
     27 import android.view.View;
     28 import android.view.WindowManager;
     29 
     30 import com.android.systemui.R;
     31 
     32 /**
     33  * Shadow for the minimized dock state on homescreen.
     34  */
     35 public class MinimizedDockShadow extends View {
     36 
     37     private final Paint mShadowPaint = new Paint();
     38 
     39     private int mDockSide = WindowManager.DOCKED_INVALID;
     40 
     41     public MinimizedDockShadow(Context context, @Nullable AttributeSet attrs) {
     42         super(context, attrs);
     43     }
     44 
     45     public void setDockSide(int dockSide) {
     46         if (dockSide != mDockSide) {
     47             mDockSide = dockSide;
     48             updatePaint(getLeft(), getTop(), getRight(), getBottom());
     49             invalidate();
     50         }
     51     }
     52 
     53     private void updatePaint(int left, int top, int right, int bottom) {
     54         int startColor = mContext.getResources().getColor(
     55                 R.color.minimize_dock_shadow_start, null);
     56         int endColor = mContext.getResources().getColor(
     57                 R.color.minimize_dock_shadow_end, null);
     58         final int middleColor = Color.argb(
     59                 (Color.alpha(startColor) + Color.alpha(endColor)) / 2, 0, 0, 0);
     60         final int quarter = Color.argb(
     61                 (int) (Color.alpha(startColor) * 0.25f + Color.alpha(endColor) * 0.75f),
     62                 0, 0, 0);
     63         if (mDockSide == WindowManager.DOCKED_TOP) {
     64             mShadowPaint.setShader(new LinearGradient(
     65                     0, 0, 0, bottom - top,
     66                     new int[] { startColor, middleColor, quarter, endColor },
     67                     new float[] { 0f, 0.35f, 0.6f, 1f }, Shader.TileMode.CLAMP));
     68         } else if (mDockSide == WindowManager.DOCKED_LEFT) {
     69             mShadowPaint.setShader(new LinearGradient(
     70                     0, 0, right - left, 0,
     71                     new int[] { startColor, middleColor, quarter, endColor },
     72                     new float[] { 0f, 0.35f, 0.6f, 1f }, Shader.TileMode.CLAMP));
     73         } else if (mDockSide == WindowManager.DOCKED_RIGHT) {
     74             mShadowPaint.setShader(new LinearGradient(
     75                     right - left, 0, 0, 0,
     76                     new int[] { startColor, middleColor, quarter, endColor },
     77                     new float[] { 0f, 0.35f, 0.6f, 1f }, Shader.TileMode.CLAMP));
     78         }
     79     }
     80 
     81     @Override
     82     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
     83         super.onLayout(changed, left, top, right, bottom);
     84         if (changed) {
     85             updatePaint(left, top, right, bottom);
     86             invalidate();
     87         }
     88     }
     89 
     90     @Override
     91     protected void onDraw(Canvas canvas) {
     92         canvas.drawRect(0, 0, getWidth(), getHeight(), mShadowPaint);
     93     }
     94 
     95     @Override
     96     public boolean hasOverlappingRendering() {
     97         return false;
     98     }
     99 }
    100