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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.icons;
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.Path;
import android.graphics.PathMeasure;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.Log;
import android.view.ViewDebug;
/**
* Used to draw a notification dot on top of an icon.
*/
public class DotRenderer {
private static final String TAG = "DotRenderer";
// The dot size is defined as a percentage of the app icon size.
private static final float SIZE_PERCENTAGE = 0.228f;
private final float mCircleRadius;
private final Paint mCirclePaint = new Paint(ANTI_ALIAS_FLAG | FILTER_BITMAP_FLAG);
private final Bitmap mBackgroundWithShadow;
private final float mBitmapOffset;
// Stores the center x and y position as a percentage (0 to 1) of the icon size
private final float[] mRightDotPosition;
private final float[] mLeftDotPosition;
public DotRenderer(int iconSizePx, Path iconShapePath, int pathSize) {
int size = Math.round(SIZE_PERCENTAGE * iconSizePx);
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.
// Find the points on the path that are closest to the top left and right corners.
mLeftDotPosition = getPathPoint(iconShapePath, pathSize, -1);
mRightDotPosition = getPathPoint(iconShapePath, pathSize, 1);
}
private static float[] getPathPoint(Path path, float size, float direction) {
float halfSize = size / 2;
// Small delta so that we don't get a zero size triangle
float delta = 1;
float x = halfSize + direction * halfSize;
Path trianglePath = new Path();
trianglePath.moveTo(halfSize, halfSize);
trianglePath.lineTo(x + delta * direction, 0);
trianglePath.lineTo(x, -delta);
trianglePath.close();
trianglePath.op(path, Path.Op.INTERSECT);
float[] pos = new float[2];
new PathMeasure(trianglePath, false).getPosTan(0, pos, null);
pos[0] = pos[0] / size;
pos[1] = pos[1] / size;
return pos;
}
/**
* Draw a circle on top of the canvas according to the given params.
*/
public void draw(Canvas canvas, DrawParams params) {
if (params == null) {
Log.e(TAG, "Invalid null argument(s) passed in call to draw.");
return;
}
canvas.save();
Rect iconBounds = params.iconBounds;
float[] dotPosition = params.leftAlign ? mLeftDotPosition : mRightDotPosition;
float dotCenterX = iconBounds.left + iconBounds.width() * dotPosition[0];
float dotCenterY = iconBounds.top + iconBounds.height() * dotPosition[1];
// Ensure dot fits entirely in canvas clip bounds.
Rect canvasBounds = canvas.getClipBounds();
float offsetX = params.leftAlign
? Math.max(0, canvasBounds.left - (dotCenterX + mBitmapOffset))
: Math.min(0, canvasBounds.right - (dotCenterX - mBitmapOffset));
float offsetY = Math.max(0, canvasBounds.top - (dotCenterY + mBitmapOffset));
// We draw the dot relative to its center.
canvas.translate(dotCenterX + offsetX, dotCenterY + offsetY);
canvas.scale(params.scale, params.scale);
mCirclePaint.setColor(Color.BLACK);
canvas.drawBitmap(mBackgroundWithShadow, mBitmapOffset, mBitmapOffset, mCirclePaint);
mCirclePaint.setColor(params.color);
canvas.drawCircle(0, 0, mCircleRadius, mCirclePaint);
canvas.restore();
}
public static class DrawParams {
/** The color (possibly based on the icon) to use for the dot. */
@ViewDebug.ExportedProperty(category = "notification dot", formatToHexString = true)
public int color;
/** The bounds of the icon that the dot is drawn on top of. */
@ViewDebug.ExportedProperty(category = "notification dot")
public Rect iconBounds = new Rect();
/** The progress of the animation, from 0 to 1. */
@ViewDebug.ExportedProperty(category = "notification dot")
public float scale;
/** Whether the dot should align to the top left of the icon rather than the top right. */
@ViewDebug.ExportedProperty(category = "notification dot")
public boolean leftAlign;
}
}
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