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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.badge;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.support.annotation.Nullable;
import com.android.launcher3.R;
import com.android.launcher3.graphics.IconPalette;
/**
* Contains parameters necessary to draw a badge for an icon (e.g. the size of the badge).
* @see BadgeInfo for the data to draw
*/
public class BadgeRenderer {
private final Context mContext;
private final int mSize;
private final int mTextHeight;
private final IconDrawer mLargeIconDrawer;
private final IconDrawer mSmallIconDrawer;
private final Paint mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
public BadgeRenderer(Context context) {
mContext = context;
Resources res = context.getResources();
mSize = res.getDimensionPixelSize(R.dimen.badge_size);
mLargeIconDrawer = new IconDrawer(res.getDimensionPixelSize(R.dimen.badge_small_padding));
mSmallIconDrawer = new IconDrawer(res.getDimensionPixelSize(R.dimen.badge_large_padding));
mTextPaint.setTextAlign(Paint.Align.CENTER);
mTextPaint.setTextSize(res.getDimensionPixelSize(R.dimen.badge_text_size));
mTextPaint.setFakeBoldText(true);
// Measure the text height.
Rect tempTextHeight = new Rect();
mTextPaint.getTextBounds("0", 0, 1, tempTextHeight);
mTextHeight = tempTextHeight.height();
}
/**
* Draw a circle in the top right corner of the given bounds, and draw
* {@link BadgeInfo#getNotificationCount()} on top of the circle.
* @param palette The colors (based on the icon) to use for the badge.
* @param badgeInfo Contains data to draw on the badge. Could be null if we are animating out.
* @param iconBounds The bounds of the icon being badged.
* @param badgeScale The progress of the animation, from 0 to 1.
*/
public void draw(Canvas canvas, IconPalette palette, @Nullable BadgeInfo badgeInfo,
Rect iconBounds, float badgeScale) {
mBackgroundPaint.setColor(palette.backgroundColor);
mTextPaint.setColor(palette.textColor);
canvas.save(Canvas.MATRIX_SAVE_FLAG);
// We draw the badge relative to its center.
canvas.translate(iconBounds.right - mSize / 2, iconBounds.top + mSize / 2);
canvas.scale(badgeScale, badgeScale);
canvas.drawCircle(0, 0, mSize / 2, mBackgroundPaint);
IconDrawer iconDrawer = badgeInfo != null && badgeInfo.isIconLarge()
? mLargeIconDrawer : mSmallIconDrawer;
Shader icon = badgeInfo == null ? null : badgeInfo.getNotificationIconForBadge(
mContext, palette.backgroundColor, mSize, iconDrawer.mPadding);
if (icon != null) {
// Draw the notification icon with padding.
iconDrawer.drawIcon(icon, canvas);
} else {
// Draw the notification count.
String notificationCount = badgeInfo == null ? "0"
: String.valueOf(badgeInfo.getNotificationCount());
canvas.drawText(notificationCount, 0, mTextHeight / 2, mTextPaint);
}
canvas.restore();
}
/** Draws the notification icon with padding of a given size. */
private class IconDrawer {
private final int mPadding;
private final Bitmap mCircleClipBitmap;
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG |
Paint.FILTER_BITMAP_FLAG);
public IconDrawer(int padding) {
mPadding = padding;
mCircleClipBitmap = Bitmap.createBitmap(mSize, mSize, Bitmap.Config.ALPHA_8);
Canvas canvas = new Canvas();
canvas.setBitmap(mCircleClipBitmap);
canvas.drawCircle(mSize / 2, mSize / 2, mSize / 2 - padding, mPaint);
}
public void drawIcon(Shader icon, Canvas canvas) {
mPaint.setShader(icon);
canvas.drawBitmap(mCircleClipBitmap, -mSize / 2, -mSize / 2, mPaint);
mPaint.setShader(null);
}
}
}
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