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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 static android.graphics.Paint.ANTI_ALIAS_FLAG;
import static android.graphics.Paint.FILTER_BITMAP_FLAG;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.util.Log;
import com.android.launcher3.graphics.ShadowGenerator;
/**
* 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 static final String TAG = "BadgeRenderer";
// The badge sizes are defined as percentages of the app icon size.
private static final float SIZE_PERCENTAGE = 0.38f;
// Extra scale down of the dot
private static final float DOT_SCALE = 0.6f;
// Used to expand the width of the badge for each additional digit.
private static final float OFFSET_PERCENTAGE = 0.02f;
private final float mDotCenterOffset;
private final int mOffset;
private final float mCircleRadius;
private final Paint mCirclePaint = new Paint(ANTI_ALIAS_FLAG | FILTER_BITMAP_FLAG);
private final Bitmap mBackgroundWithShadow;
private final float mBitmapOffset;
public BadgeRenderer(int iconSizePx) {
mDotCenterOffset = SIZE_PERCENTAGE * iconSizePx;
mOffset = (int) (OFFSET_PERCENTAGE * iconSizePx);
int size = (int) (DOT_SCALE * mDotCenterOffset);
ShadowGenerator.Builder builder = new ShadowGenerator.Builder(Color.TRANSPARENT);
builder.ambientShadowAlpha = 88;
mBackgroundWithShadow = builder.setupBlurForSize(size).createPill(size, size);
mCircleRadius = builder.radius;
mBitmapOffset = -mBackgroundWithShadow.getHeight() * 0.5f; // Same as width.
}
/**
* Draw a circle in the top right corner of the given bounds, and draw
* {@link BadgeInfo#getNotificationCount()} on top of the circle.
* @param color The color (based on the icon) to use for the badge.
* @param iconBounds The bounds of the icon being badged.
* @param badgeScale The progress of the animation, from 0 to 1.
* @param spaceForOffset How much space is available to offset the badge up and to the right.
*/
public void draw(
Canvas canvas, int color, Rect iconBounds, float badgeScale, Point spaceForOffset) {
if (iconBounds == null || spaceForOffset == null) {
Log.e(TAG, "Invalid null argument(s) passed in call to draw.");
return;
}
canvas.save();
// We draw the badge relative to its center.
float badgeCenterX = iconBounds.right - mDotCenterOffset / 2;
float badgeCenterY = iconBounds.top + mDotCenterOffset / 2;
int offsetX = Math.min(mOffset, spaceForOffset.x);
int offsetY = Math.min(mOffset, spaceForOffset.y);
canvas.translate(badgeCenterX + offsetX, badgeCenterY - offsetY);
canvas.scale(badgeScale, badgeScale);
mCirclePaint.setColor(Color.BLACK);
canvas.drawBitmap(mBackgroundWithShadow, mBitmapOffset, mBitmapOffset, mCirclePaint);
mCirclePaint.setColor(color);
canvas.drawCircle(0, 0, mCircleRadius, mCirclePaint);
canvas.restore();
}
}
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