/*
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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.launcher3.graphics;
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import android.graphics.Canvas;
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import android.graphics.ColorFilter;
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import android.graphics.Matrix;
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import android.graphics.Outline;
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import android.graphics.Paint;
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import android.graphics.Path;
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import android.graphics.PixelFormat;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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public class FastScrollThumbDrawable extends Drawable {
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private static final Matrix sMatrix = new Matrix();
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private final Path mPath = new Path();
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private final Paint mPaint;
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private final boolean mIsRtl;
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public FastScrollThumbDrawable(Paint paint, boolean isRtl) {
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mPaint = paint;
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mIsRtl = isRtl;
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}
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@Override
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public void getOutline(Outline outline) {
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if (mPath.isConvex()) {
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outline.setConvexPath(mPath);
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}
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}
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@Override
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protected void onBoundsChange(Rect bounds) {
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mPath.reset();
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float r = bounds.height() * 0.5f;
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// The path represents a rotate tear-drop shape, with radius of one corner is 1/5th of the
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// other 3 corners.
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float diameter = 2 * r;
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float r2 = r / 5;
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mPath.addRoundRect(bounds.left, bounds.top, bounds.left + diameter, bounds.top + diameter,
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new float[] {r, r, r, r, r2, r2, r, r},
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Path.Direction.CCW);
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sMatrix.setRotate(-45, bounds.left + r, bounds.top + r);
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if (mIsRtl) {
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sMatrix.postTranslate(bounds.width(), 0);
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sMatrix.postScale(-1, 1, bounds.width(), 0);
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}
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mPath.transform(sMatrix);
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}
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@Override
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public void draw(Canvas canvas) {
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canvas.drawPath(mPath, mPaint);
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}
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@Override
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public void setAlpha(int i) {
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// Not supported
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}
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@Override
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public void setColorFilter(ColorFilter colorFilter) {
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// Not supported
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}
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@Override
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public int getOpacity() {
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return PixelFormat.TRANSLUCENT;
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}
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}
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