144 lines
5.4 KiB
Java
144 lines
5.4 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.uiuios.icons;
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import static android.graphics.Paint.ANTI_ALIAS_FLAG;
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import static android.graphics.Paint.FILTER_BITMAP_FLAG;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Path;
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import android.graphics.PathMeasure;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.util.Log;
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import android.view.ViewDebug;
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/**
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* Used to draw a notification dot on top of an icon.
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*/
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public class DotRenderer {
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private static final String TAG = "DotRenderer";
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// The dot size is defined as a percentage of the app icon size.
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private static final float SIZE_PERCENTAGE = 0.228f;
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private final float mCircleRadius;
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private final Paint mCirclePaint = new Paint(ANTI_ALIAS_FLAG | FILTER_BITMAP_FLAG);
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private final Bitmap mBackgroundWithShadow;
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private final float mBitmapOffset;
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// Stores the center x and y position as a percentage (0 to 1) of the icon size
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private final float[] mRightDotPosition;
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private final float[] mLeftDotPosition;
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public DotRenderer(int iconSizePx, Path iconShapePath, int pathSize) {
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int size = Math.round(SIZE_PERCENTAGE * iconSizePx);
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ShadowGenerator.Builder builder = new ShadowGenerator.Builder(Color.TRANSPARENT);
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builder.ambientShadowAlpha = 88;
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mBackgroundWithShadow = builder.setupBlurForSize(size).createPill(size, size);
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mCircleRadius = builder.radius;
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mBitmapOffset = -mBackgroundWithShadow.getHeight() * 0.5f; // Same as width.
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// Find the points on the path that are closest to the top left and right corners.
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mLeftDotPosition = getPathPoint(iconShapePath, pathSize, -1);
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mRightDotPosition = getPathPoint(iconShapePath, pathSize, 1);
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}
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private static float[] getPathPoint(Path path, float size, float direction) {
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float halfSize = size / 2;
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// Small delta so that we don't get a zero size triangle
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float delta = 1;
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float x = halfSize + direction * halfSize;
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Path trianglePath = new Path();
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trianglePath.moveTo(halfSize, halfSize);
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trianglePath.lineTo(x + delta * direction, 0);
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trianglePath.lineTo(x, -delta);
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trianglePath.close();
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trianglePath.op(path, Path.Op.INTERSECT);
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float[] pos = new float[2];
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new PathMeasure(trianglePath, false).getPosTan(0, pos, null);
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pos[0] = pos[0] / size;
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pos[1] = pos[1] / size;
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return pos;
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}
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public float[] getLeftDotPosition() {
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return mLeftDotPosition;
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}
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public float[] getRightDotPosition() {
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return mRightDotPosition;
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}
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/**
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* Draw a circle on top of the canvas according to the given params.
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*/
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public void draw(Canvas canvas, DrawParams params) {
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if (params == null) {
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Log.e(TAG, "Invalid null argument(s) passed in call to draw.");
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return;
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}
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canvas.save();
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Rect iconBounds = params.iconBounds;
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float[] dotPosition = params.leftAlign ? mLeftDotPosition : mRightDotPosition;
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float dotCenterX = iconBounds.left + iconBounds.width() * dotPosition[0];
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float dotCenterY = iconBounds.top + iconBounds.height() * dotPosition[1];
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// Ensure dot fits entirely in canvas clip bounds.
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Rect canvasBounds = canvas.getClipBounds();
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float offsetX = params.leftAlign
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? Math.max(0, canvasBounds.left - (dotCenterX + mBitmapOffset))
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: Math.min(0, canvasBounds.right - (dotCenterX - mBitmapOffset));
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float offsetY = Math.max(0, canvasBounds.top - (dotCenterY + mBitmapOffset));
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// We draw the dot relative to its center.
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canvas.translate(dotCenterX + offsetX, dotCenterY + offsetY);
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canvas.scale(params.scale, params.scale);
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mCirclePaint.setColor(Color.BLACK);
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canvas.drawBitmap(mBackgroundWithShadow, mBitmapOffset, mBitmapOffset, mCirclePaint);
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mCirclePaint.setColor(params.color);
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canvas.drawCircle(0, 0, mCircleRadius, mCirclePaint);
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canvas.restore();
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}
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public static class DrawParams {
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/** The color (possibly based on the icon) to use for the dot. */
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@ViewDebug.ExportedProperty(category = "notification dot", formatToHexString = true)
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public int color;
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/** The bounds of the icon that the dot is drawn on top of. */
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@ViewDebug.ExportedProperty(category = "notification dot")
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public Rect iconBounds = new Rect();
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/** The progress of the animation, from 0 to 1. */
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@ViewDebug.ExportedProperty(category = "notification dot")
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public float scale;
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/** Whether the dot should align to the top left of the icon rather than the top right. */
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@ViewDebug.ExportedProperty(category = "notification dot")
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public boolean leftAlign;
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}
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}
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