1 /*
2  * Copyright (C) 2016 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.graphics;
17 
18 import android.content.Context;
19 import android.graphics.Canvas;
20 import android.graphics.Paint;
21 import android.graphics.Paint.FontMetricsInt;
22 import android.graphics.drawable.Drawable;
23 import android.text.style.DynamicDrawableSpan;
24 
25 /**
26  * {@link DynamicDrawableSpan} which draws a drawable tinted with the current paint color.
27  */
28 public class TintedDrawableSpan extends DynamicDrawableSpan {
29 
30     private final Drawable mDrawable;
31     private int mOldTint;
32 
TintedDrawableSpan(Context context, int resourceId)33     public TintedDrawableSpan(Context context, int resourceId) {
34         super(ALIGN_BOTTOM);
35         mDrawable = context.getDrawable(resourceId).mutate();
36         mOldTint = 0;
37         mDrawable.setTint(0);
38     }
39 
40     @Override
getSize(Paint paint, CharSequence text, int start, int end, FontMetricsInt fm)41     public int getSize(Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
42         fm = fm == null ? paint.getFontMetricsInt() : fm;
43         int iconSize = fm.bottom - fm.top;
44         mDrawable.setBounds(0, 0, iconSize, iconSize);
45         return super.getSize(paint, text, start, end, fm);
46     }
47 
48     @Override
draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint)49     public void draw(Canvas canvas, CharSequence text,
50             int start, int end, float x, int top, int y, int bottom, Paint paint) {
51         int color = paint.getColor();
52         if (mOldTint != color) {
53             mOldTint = color;
54             mDrawable.setTint(mOldTint);
55         }
56         super.draw(canvas, text, start, end, x, top, y, bottom, paint);
57     }
58 
59     @Override
getDrawable()60     public Drawable getDrawable() {
61         return mDrawable;
62     }
63 }
64