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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.statusbar.notification;
     18 
     19 import android.annotation.Nullable;
     20 import android.content.Context;
     21 import android.graphics.Outline;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 import android.view.ViewGroup;
     25 import android.view.ViewOutlineProvider;
     26 import android.widget.LinearLayout;
     27 
     28 import com.android.systemui.R;
     29 import com.android.systemui.statusbar.AlphaOptimizedFrameLayout;
     30 
     31 /**
     32  * A view used to cast a shadow of a certain size on another view
     33  */
     34 public class FakeShadowView extends AlphaOptimizedFrameLayout {
     35     public static final float SHADOW_SIBLING_TRESHOLD = 0.1f;
     36     private final int mShadowMinHeight;
     37 
     38     private View mFakeShadow;
     39     private float mOutlineAlpha;
     40 
     41     public FakeShadowView(Context context) {
     42         this(context, null);
     43     }
     44 
     45     public FakeShadowView(Context context, @Nullable AttributeSet attrs) {
     46         this(context, attrs, 0);
     47     }
     48 
     49     public FakeShadowView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
     50         this(context, attrs, defStyleAttr, 0);
     51     }
     52 
     53     public FakeShadowView(Context context, @Nullable AttributeSet attrs, int defStyleAttr,
     54             int defStyleRes) {
     55         super(context, attrs, defStyleAttr, defStyleRes);
     56         mFakeShadow = new View(context);
     57         mFakeShadow.setVisibility(INVISIBLE);
     58         mFakeShadow.setLayoutParams(new LinearLayout.LayoutParams(
     59                 ViewGroup.LayoutParams.MATCH_PARENT,
     60                 (int) (48 * getResources().getDisplayMetrics().density)));
     61         mFakeShadow.setOutlineProvider(new ViewOutlineProvider() {
     62             @Override
     63             public void getOutline(View view, Outline outline) {
     64                 outline.setRect(0, 0, getWidth(), mFakeShadow.getHeight());
     65                 outline.setAlpha(mOutlineAlpha);
     66             }
     67         });
     68         addView(mFakeShadow);
     69         mShadowMinHeight = Math.max(1, context.getResources()
     70                 .getDimensionPixelSize(R.dimen.notification_divider_height));
     71     }
     72 
     73     public void setFakeShadowTranslationZ(float fakeShadowTranslationZ, float outlineAlpha,
     74             int shadowYEnd, int outlineTranslation) {
     75         if (fakeShadowTranslationZ == 0.0f) {
     76             mFakeShadow.setVisibility(INVISIBLE);
     77         } else {
     78             mFakeShadow.setVisibility(VISIBLE);
     79             fakeShadowTranslationZ = Math.max(mShadowMinHeight, fakeShadowTranslationZ);
     80             mFakeShadow.setTranslationZ(fakeShadowTranslationZ);
     81             mFakeShadow.setTranslationX(outlineTranslation);
     82             mFakeShadow.setTranslationY(shadowYEnd - mFakeShadow.getHeight());
     83             if (outlineAlpha != mOutlineAlpha) {
     84                 mOutlineAlpha = outlineAlpha;
     85                 mFakeShadow.invalidateOutline();
     86             }
     87         }
     88     }
     89 }
     90