2 * Copyright (C) 2017 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package com.android.launcher3.badge;
19 import android.content.Context;
20 import android.content.res.Resources;
21 import android.graphics.Bitmap;
22 import android.graphics.Canvas;
23 import android.graphics.Color;
24 import android.graphics.Paint;
25 import android.graphics.Point;
26 import android.graphics.Rect;
27 import android.graphics.Shader;
28 import android.support.annotation.Nullable;
29 import android.util.SparseArray;
31 import com.android.launcher3.R;
32 import com.android.launcher3.graphics.IconPalette;
33 import com.android.launcher3.graphics.ShadowGenerator;
36 * Contains parameters necessary to draw a badge for an icon (e.g. the size of the badge).
37 * @see BadgeInfo for the data to draw
39 public class BadgeRenderer {
41 private static final boolean DOTS_ONLY = true;
43 // The badge sizes are defined as percentages of the app icon size.
44 private static final float SIZE_PERCENTAGE = 0.38f;
45 // Used to expand the width of the badge for each additional digit.
46 private static final float CHAR_SIZE_PERCENTAGE = 0.12f;
47 private static final float TEXT_SIZE_PERCENTAGE = 0.26f;
48 private static final float OFFSET_PERCENTAGE = 0.02f;
49 private static final float STACK_OFFSET_PERCENTAGE_X = 0.05f;
50 private static final float STACK_OFFSET_PERCENTAGE_Y = 0.06f;
51 private static final float DOT_SCALE = 0.6f;
53 private final Context mContext;
54 private final int mSize;
55 private final int mCharSize;
56 private final int mTextHeight;
57 private final int mOffset;
58 private final int mStackOffsetX;
59 private final int mStackOffsetY;
60 private final IconDrawer mLargeIconDrawer;
61 private final IconDrawer mSmallIconDrawer;
62 private final Paint mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
63 private final Paint mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG
64 | Paint.FILTER_BITMAP_FLAG);
65 private final SparseArray<Bitmap> mBackgroundsWithShadow;
67 public BadgeRenderer(Context context, int iconSizePx) {
69 Resources res = context.getResources();
70 mSize = (int) (SIZE_PERCENTAGE * iconSizePx);
71 mCharSize = (int) (CHAR_SIZE_PERCENTAGE * iconSizePx);
72 mOffset = (int) (OFFSET_PERCENTAGE * iconSizePx);
73 mStackOffsetX = (int) (STACK_OFFSET_PERCENTAGE_X * iconSizePx);
74 mStackOffsetY = (int) (STACK_OFFSET_PERCENTAGE_Y * iconSizePx);
75 mTextPaint.setTextSize(iconSizePx * TEXT_SIZE_PERCENTAGE);
76 mTextPaint.setTextAlign(Paint.Align.CENTER);
77 mLargeIconDrawer = new IconDrawer(res.getDimensionPixelSize(R.dimen.badge_small_padding));
78 mSmallIconDrawer = new IconDrawer(res.getDimensionPixelSize(R.dimen.badge_large_padding));
79 // Measure the text height.
80 Rect tempTextHeight = new Rect();
81 mTextPaint.getTextBounds("0", 0, 1, tempTextHeight);
82 mTextHeight = tempTextHeight.height();
84 mBackgroundsWithShadow = new SparseArray<>(3);
88 * Draw a circle in the top right corner of the given bounds, and draw
89 * {@link BadgeInfo#getNotificationCount()} on top of the circle.
90 * @param palette The colors (based on the icon) to use for the badge.
91 * @param badgeInfo Contains data to draw on the badge. Could be null if we are animating out.
92 * @param iconBounds The bounds of the icon being badged.
93 * @param badgeScale The progress of the animation, from 0 to 1.
94 * @param spaceForOffset How much space is available to offset the badge up and to the right.
96 public void draw(Canvas canvas, IconPalette palette, @Nullable BadgeInfo badgeInfo,
97 Rect iconBounds, float badgeScale, Point spaceForOffset) {
98 mTextPaint.setColor(palette.textColor);
99 IconDrawer iconDrawer = badgeInfo != null && badgeInfo.isIconLarge()
100 ? mLargeIconDrawer : mSmallIconDrawer;
101 Shader icon = badgeInfo == null ? null : badgeInfo.getNotificationIconForBadge(
102 mContext, palette.backgroundColor, mSize, iconDrawer.mPadding);
103 String notificationCount = badgeInfo == null ? "0"
104 : String.valueOf(badgeInfo.getNotificationCount());
105 int numChars = notificationCount.length();
106 int width = DOTS_ONLY ? mSize : mSize + mCharSize * (numChars - 1);
107 // Lazily load the background with shadow.
108 Bitmap backgroundWithShadow = mBackgroundsWithShadow.get(numChars);
109 if (backgroundWithShadow == null) {
110 backgroundWithShadow = ShadowGenerator.createPillWithShadow(Color.WHITE, width, mSize);
111 mBackgroundsWithShadow.put(numChars, backgroundWithShadow);
113 canvas.save(Canvas.MATRIX_SAVE_FLAG);
114 // We draw the badge relative to its center.
115 int badgeCenterX = iconBounds.right - width / 2;
116 int badgeCenterY = iconBounds.top + mSize / 2;
117 boolean isText = !DOTS_ONLY && badgeInfo != null && badgeInfo.getNotificationCount() != 0;
118 boolean isIcon = !DOTS_ONLY && icon != null;
119 boolean isDot = !(isText || isIcon);
121 badgeScale *= DOT_SCALE;
123 int offsetX = Math.min(mOffset, spaceForOffset.x);
124 int offsetY = Math.min(mOffset, spaceForOffset.y);
125 canvas.translate(badgeCenterX + offsetX, badgeCenterY - offsetY);
126 canvas.scale(badgeScale, badgeScale);
127 // Prepare the background and shadow and possible stacking effect.
128 mBackgroundPaint.setColorFilter(palette.backgroundColorMatrixFilter);
129 int backgroundWithShadowSize = backgroundWithShadow.getHeight(); // Same as width.
130 boolean shouldStack = !isDot && badgeInfo != null
131 && badgeInfo.getNotificationKeys().size() > 1;
133 int offsetDiffX = mStackOffsetX - mOffset;
134 int offsetDiffY = mStackOffsetY - mOffset;
135 canvas.translate(offsetDiffX, offsetDiffY);
136 canvas.drawBitmap(backgroundWithShadow, -backgroundWithShadowSize / 2,
137 -backgroundWithShadowSize / 2, mBackgroundPaint);
138 canvas.translate(-offsetDiffX, -offsetDiffY);
142 canvas.drawBitmap(backgroundWithShadow, -backgroundWithShadowSize / 2,
143 -backgroundWithShadowSize / 2, mBackgroundPaint);
144 canvas.drawText(notificationCount, 0, mTextHeight / 2, mTextPaint);
146 canvas.drawBitmap(backgroundWithShadow, -backgroundWithShadowSize / 2,
147 -backgroundWithShadowSize / 2, mBackgroundPaint);
148 iconDrawer.drawIcon(icon, canvas);
150 mBackgroundPaint.setColorFilter(palette.saturatedBackgroundColorMatrixFilter);
151 canvas.drawBitmap(backgroundWithShadow, -backgroundWithShadowSize / 2,
152 -backgroundWithShadowSize / 2, mBackgroundPaint);
157 /** Draws the notification icon with padding of a given size. */
158 private class IconDrawer {
160 private final int mPadding;
161 private final Bitmap mCircleClipBitmap;
162 private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG |
163 Paint.FILTER_BITMAP_FLAG);
165 public IconDrawer(int padding) {
167 mCircleClipBitmap = Bitmap.createBitmap(mSize, mSize, Bitmap.Config.ALPHA_8);
168 Canvas canvas = new Canvas();
169 canvas.setBitmap(mCircleClipBitmap);
170 canvas.drawCircle(mSize / 2, mSize / 2, mSize / 2 - padding, mPaint);
173 public void drawIcon(Shader icon, Canvas canvas) {
174 mPaint.setShader(icon);
175 canvas.drawBitmap(mCircleClipBitmap, -mSize / 2, -mSize / 2, mPaint);
176 mPaint.setShader(null);