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
|
/*
* Copyright (C) 2015 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.calculator2;
import android.content.Context;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.TextView;
/**
* Extended {@link TextView} that supports ascent/baseline alignment.
*/
public class AlignedTextView extends TextView {
private static final String LATIN_CAPITAL_LETTER = "H";
// temporary rect for use during layout
private final Rect mTempRect = new Rect();
private int mTopPaddingOffset;
private int mBottomPaddingOffset;
public AlignedTextView(Context context) {
this(context, null /* attrs */);
}
public AlignedTextView(Context context, AttributeSet attrs) {
this(context, attrs, android.R.attr.textViewStyle);
}
public AlignedTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// Disable any included font padding by default.
setIncludeFontPadding(false);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final Paint paint = getPaint();
// Always align text to the default capital letter height.
paint.getTextBounds(LATIN_CAPITAL_LETTER, 0, 1, mTempRect);
mTopPaddingOffset = Math.min(getPaddingTop(),
(int) Math.ceil(mTempRect.top - paint.ascent()));
mBottomPaddingOffset = Math.min(getPaddingBottom(), (int) Math.ceil(paint.descent()));
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
public int getCompoundPaddingTop() {
return super.getCompoundPaddingTop() - mTopPaddingOffset;
}
@Override
public int getCompoundPaddingBottom() {
return super.getCompoundPaddingBottom() - mBottomPaddingOffset;
}
}
|
