1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.android.launcher3.icons;
17 
18 import android.animation.Animator;
19 import android.animation.AnimatorListenerAdapter;
20 import android.animation.ValueAnimator;
21 import android.content.Context;
22 import android.graphics.Canvas;
23 import android.graphics.Color;
24 import android.graphics.Path;
25 import android.graphics.PorterDuff;
26 import android.graphics.PorterDuffColorFilter;
27 import android.graphics.Rect;
28 import android.graphics.drawable.Drawable;
29 
30 import androidx.core.graphics.ColorUtils;
31 
32 /**
33  * Subclass which draws a placeholder icon when the actual icon is not yet loaded
34  */
35 public class PlaceHolderIconDrawable extends FastBitmapDrawable {
36 
37     // Path in [0, 100] bounds.
38     private final Path mProgressPath;
39 
PlaceHolderIconDrawable(BitmapInfo info, Context context)40     public PlaceHolderIconDrawable(BitmapInfo info, Context context) {
41         super(info);
42 
43         mProgressPath = GraphicsUtils.getShapePath(100);
44         mPaint.setColor(ColorUtils.compositeColors(
45                 GraphicsUtils.getAttrColor(context, R.attr.loadingIconColor), info.color));
46     }
47 
48     @Override
drawInternal(Canvas canvas, Rect bounds)49     protected void drawInternal(Canvas canvas, Rect bounds) {
50         int saveCount = canvas.save();
51         canvas.translate(bounds.left, bounds.top);
52         canvas.scale(bounds.width() / 100f, bounds.height() / 100f);
53         canvas.drawPath(mProgressPath, mPaint);
54         canvas.restoreToCount(saveCount);
55     }
56 
57     /** Updates this placeholder to {@code newIcon} with animation. */
animateIconUpdate(Drawable newIcon)58     public void animateIconUpdate(Drawable newIcon) {
59         int placeholderColor = mPaint.getColor();
60         int originalAlpha = Color.alpha(placeholderColor);
61 
62         ValueAnimator iconUpdateAnimation = ValueAnimator.ofInt(originalAlpha, 0);
63         iconUpdateAnimation.setDuration(375);
64         iconUpdateAnimation.addUpdateListener(valueAnimator -> {
65             int newAlpha = (int) valueAnimator.getAnimatedValue();
66             int newColor = ColorUtils.setAlphaComponent(placeholderColor, newAlpha);
67 
68             newIcon.setColorFilter(new PorterDuffColorFilter(newColor, PorterDuff.Mode.SRC_ATOP));
69         });
70         iconUpdateAnimation.addListener(new AnimatorListenerAdapter() {
71             @Override
72             public void onAnimationEnd(Animator animation) {
73                 newIcon.setColorFilter(null);
74             }
75         });
76         iconUpdateAnimation.start();
77     }
78 
79 }
80