1 /* 2 * Copyright (C) 2017 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.launcher3.views; 18 19 import android.content.Context; 20 import android.content.res.TypedArray; 21 import android.graphics.Canvas; 22 import android.graphics.Color; 23 import android.support.v4.graphics.ColorUtils; 24 import android.util.AttributeSet; 25 import android.widget.TextView; 26 27 import com.android.launcher3.BubbleTextView; 28 import com.android.launcher3.R; 29 30 /** 31 * Extension of {@link BubbleTextView} which draws two shadows on the text (ambient and key shadows} 32 */ 33 public class DoubleShadowBubbleTextView extends BubbleTextView { 34 35 private final ShadowInfo mShadowInfo; 36 DoubleShadowBubbleTextView(Context context)37 public DoubleShadowBubbleTextView(Context context) { 38 this(context, null); 39 } 40 DoubleShadowBubbleTextView(Context context, AttributeSet attrs)41 public DoubleShadowBubbleTextView(Context context, AttributeSet attrs) { 42 this(context, attrs, 0); 43 } 44 DoubleShadowBubbleTextView(Context context, AttributeSet attrs, int defStyle)45 public DoubleShadowBubbleTextView(Context context, AttributeSet attrs, int defStyle) { 46 super(context, attrs, defStyle); 47 mShadowInfo = new ShadowInfo(context, attrs, defStyle); 48 setShadowLayer(mShadowInfo.ambientShadowBlur, 0, 0, mShadowInfo.ambientShadowColor); 49 } 50 51 @Override onDraw(Canvas canvas)52 public void onDraw(Canvas canvas) { 53 // If text is transparent or shadow alpha is 0, don't draw any shadow 54 if (mShadowInfo.skipDoubleShadow(this)) { 55 super.onDraw(canvas); 56 return; 57 } 58 int alpha = Color.alpha(getCurrentTextColor()); 59 60 // We enhance the shadow by drawing the shadow twice 61 getPaint().setShadowLayer(mShadowInfo.ambientShadowBlur, 0, 0, 62 ColorUtils.setAlphaComponent(mShadowInfo.ambientShadowColor, alpha)); 63 64 drawWithoutBadge(canvas); 65 canvas.save(); 66 canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(), 67 getScrollX() + getWidth(), 68 getScrollY() + getHeight()); 69 70 getPaint().setShadowLayer(mShadowInfo.keyShadowBlur, 0.0f, mShadowInfo.keyShadowOffset, 71 ColorUtils.setAlphaComponent(mShadowInfo.keyShadowColor, alpha)); 72 drawWithoutBadge(canvas); 73 canvas.restore(); 74 75 drawBadgeIfNecessary(canvas); 76 } 77 78 public static class ShadowInfo { 79 public final float ambientShadowBlur; 80 public final int ambientShadowColor; 81 82 public final float keyShadowBlur; 83 public final float keyShadowOffset; 84 public final int keyShadowColor; 85 ShadowInfo(Context c, AttributeSet attrs, int defStyle)86 public ShadowInfo(Context c, AttributeSet attrs, int defStyle) { 87 88 TypedArray a = c.obtainStyledAttributes( 89 attrs, R.styleable.ShadowInfo, defStyle, 0); 90 91 ambientShadowBlur = a.getDimension(R.styleable.ShadowInfo_ambientShadowBlur, 0); 92 ambientShadowColor = a.getColor(R.styleable.ShadowInfo_ambientShadowColor, 0); 93 94 keyShadowBlur = a.getDimension(R.styleable.ShadowInfo_keyShadowBlur, 0); 95 keyShadowOffset = a.getDimension(R.styleable.ShadowInfo_keyShadowOffset, 0); 96 keyShadowColor = a.getColor(R.styleable.ShadowInfo_keyShadowColor, 0); 97 a.recycle(); 98 } 99 skipDoubleShadow(TextView textView)100 public boolean skipDoubleShadow(TextView textView) { 101 int textAlpha = Color.alpha(textView.getCurrentTextColor()); 102 int keyShadowAlpha = Color.alpha(keyShadowColor); 103 int ambientShadowAlpha = Color.alpha(ambientShadowColor); 104 if (textAlpha == 0 || (keyShadowAlpha == 0 && ambientShadowAlpha == 0)) { 105 textView.getPaint().clearShadowLayer(); 106 return true; 107 } else if (ambientShadowAlpha > 0) { 108 textView.getPaint().setShadowLayer(ambientShadowBlur, 0, 0, 109 ColorUtils.setAlphaComponent(ambientShadowColor, textAlpha)); 110 return true; 111 } else if (keyShadowAlpha > 0) { 112 textView.getPaint().setShadowLayer(keyShadowBlur, 0.0f, keyShadowOffset, 113 ColorUtils.setAlphaComponent(keyShadowColor, textAlpha)); 114 return true; 115 } else { 116 return false; 117 } 118 } 119 } 120 } 121