1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/*
* Copyright (C) 2014 Google Inc.
* Licensed to The Android Open Source Project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.mail.browse;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.FontMetricsInt;
import android.graphics.RectF;
import android.text.Spanned;
import android.text.TextPaint;
import android.text.style.CharacterStyle;
import android.text.style.ReplacementSpan;
/**
* A replacement span to use when displaying a badge in a conversation list item.
* A badge will be some piece of text with a colored background and rounded
* corners.
*/
public class BadgeSpan extends ReplacementSpan {
public interface BadgeSpanDimensions {
/**
* Returns the padding value that corresponds to one side of the
* horizontal padding surrounding the text inside the background color.
*/
int getHorizontalPadding();
/**
* Returns the radius to use for the rounded corners on the background rect.
*/
float getRoundedCornerRadius();
}
private TextPaint mWorkPaint = new TextPaint();
/**
* A reference to the enclosing Spanned object to collect other CharacterStyle spans and take
* them into account when drawing.
*/
private final Spanned mSpanned;
private final BadgeSpanDimensions mDims;
public BadgeSpan(Spanned spanned, BadgeSpanDimensions dims) {
mSpanned = spanned;
mDims = dims;
}
@Override
public int getSize(Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
if (fm != null) {
paint.getFontMetricsInt(fm);
// The magic set of measurements to vertically center text within a colored region!
fm.top = fm.ascent;
}
return measureWidth(paint, text, start, end);
}
private int measureWidth(Paint paint, CharSequence text, int start, int end) {
return (int) paint.measureText(text, start, end) + 2 * mDims.getHorizontalPadding();
}
@Override
public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top,
int y, int bottom, Paint paint) {
mWorkPaint.set(paint);
// take into account the foreground/background color spans when painting
final CharacterStyle[] otherSpans = mSpanned.getSpans(start, end, CharacterStyle.class);
for (CharacterStyle otherSpan : otherSpans) {
otherSpan.updateDrawState(mWorkPaint);
}
// paint a background if present
if (mWorkPaint.bgColor != 0) {
final int prevColor = mWorkPaint.getColor();
final Paint.Style prevStyle = mWorkPaint.getStyle();
mWorkPaint.setColor(mWorkPaint.bgColor);
mWorkPaint.setStyle(Paint.Style.FILL);
final int bgWidth = measureWidth(mWorkPaint, text, start, end);
final RectF rect = new RectF(x, top, x + bgWidth, bottom);
final float radius = mDims.getRoundedCornerRadius();
canvas.drawRoundRect(rect, radius, radius, mWorkPaint);
mWorkPaint.setColor(prevColor);
mWorkPaint.setStyle(prevStyle);
}
canvas.drawText(text, start, end, x + mDims.getHorizontalPadding(), y, mWorkPaint);
}
}
|
