1 /*
2  * Copyright (C) 2012 Google Inc.
3  * Licensed to The Android Open Source Project.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 package com.android.mail.text;
19 
20 import android.graphics.Canvas;
21 import android.graphics.Paint;
22 import android.support.v4.text.BidiFormatter;
23 import android.text.TextPaint;
24 import android.text.TextUtils;
25 import android.text.style.ReplacementSpan;
26 
27 import com.android.mail.ui.FolderDisplayer;
28 
29 /**
30  * A replacement span to use when displaying folders in conversation view. Prevents a folder name
31  * from wrapping mid-name, and ellipsizes very long folder names that can't fit on a single line.
32  */
33 public class FolderSpan extends ReplacementSpan {
34     private final TextPaint mWorkPaint = new TextPaint();
35     private final String mName;
36     private final int mFgColor;
37     private final int mBgColor;
38     private final FolderDisplayer.FolderDrawableResources mRes;
39     private final BidiFormatter mFormatter;
40     private final FolderSpanDimensions mDim;
41 
FolderSpan(String name, int fgColor, int bgColor, FolderDisplayer.FolderDrawableResources res, BidiFormatter formatter, FolderSpanDimensions dim)42     public FolderSpan(String name, int fgColor, int bgColor,
43             FolderDisplayer.FolderDrawableResources res, BidiFormatter formatter,
44             FolderSpanDimensions dim) {
45         super();
46 
47         mName = name;
48         mFgColor = fgColor;
49         mBgColor = bgColor;
50         mRes = res;
51         mFormatter = formatter;
52         mDim = dim;
53     }
54 
getWidth(Paint p)55     private int getWidth(Paint p) {
56         p.setTextSize(mRes.folderFontSize);
57         return Math.min((int) p.measureText(mName) + 2 * mRes.folderHorizontalPadding,
58                 mDim.getMaxChipWidth());
59     }
60 
getHeight(Paint p)61     private int getHeight(Paint p) {
62         p.setTextSize(mRes.folderFontSize);
63         final Paint.FontMetricsInt fm = p.getFontMetricsInt();
64         return fm.bottom - fm.top;
65     }
66 
67     @Override
getSize(Paint p, CharSequence text, int start, int end, Paint.FontMetricsInt fm)68     public int getSize(Paint p, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
69         mWorkPaint.set(p);
70         return getWidth(mWorkPaint);
71     }
72 
73     @Override
draw(Canvas canvas, CharSequence charSequence, int start, int end, float x, int top, int baseline, int bottom, Paint paint)74     public void draw(Canvas canvas, CharSequence charSequence, int start, int end, float x, int top,
75             int baseline, int bottom, Paint paint) {
76         mWorkPaint.set(paint);
77         mWorkPaint.setTextSize(mRes.folderFontSize);
78         final int width = getWidth(mWorkPaint);
79         final int height = getHeight(mWorkPaint);
80         String name = mName;
81         if (width == mDim.getMaxChipWidth()) {
82             name = TextUtils.ellipsize(mName, mWorkPaint, width - 2 * mRes.folderHorizontalPadding,
83                     TextUtils.TruncateAt.MIDDLE).toString();
84         }
85         FolderDisplayer.drawFolder(canvas, x, baseline - height, width, height, name, mFgColor,
86                 mBgColor, mRes, mFormatter, mWorkPaint);
87     }
88 
89     public static interface FolderSpanDimensions {
getMaxChipWidth()90         int getMaxChipWidth();
91     }
92 }
93