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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright (C) 2014 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.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
* A layout that places children in an evenly distributed grid based on the specified
* {@link android.R.attr#columnCount} and {@link android.R.attr#rowCount} attributes.
*/
public class CalculatorPadLayout extends ViewGroup {
private int mRowCount;
private int mColumnCount;
public CalculatorPadLayout(Context context) {
this(context, null);
}
public CalculatorPadLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CalculatorPadLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
final TypedArray a = context.obtainStyledAttributes(attrs,
new int[] { android.R.attr.rowCount, android.R.attr.columnCount }, defStyle, 0);
mRowCount = a.getInt(0, 1);
mColumnCount = a.getInt(1, 1);
a.recycle();
}
@Override
public boolean shouldDelayChildPressedState() {
return false;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
final int paddingLeft = getPaddingLeft();
final int paddingRight = getPaddingRight();
final int paddingTop = getPaddingTop();
final int paddingBottom = getPaddingBottom();
final boolean isRTL = getLayoutDirection() == LAYOUT_DIRECTION_RTL;
int columnCount = mColumnCount;
int columnWidth = (right - left - paddingLeft - paddingRight) / columnCount;
final int rowHeight = (bottom - top - paddingTop - paddingBottom) / mRowCount;
int rowIndex = 0, columnIndex = 0;
for (int childIndex = 0; childIndex < getChildCount(); ++childIndex) {
final View childView = getChildAt(childIndex);
if (childView.getVisibility() == View.GONE) {
continue;
}
final MarginLayoutParams lp = (MarginLayoutParams) childView.getLayoutParams();
final int childTop = paddingTop + lp.topMargin + rowIndex * rowHeight;
final int childBottom = childTop - lp.topMargin - lp.bottomMargin + rowHeight;
final int childLeft = paddingLeft + lp.leftMargin +
(isRTL ? (columnCount - 1) - columnIndex : columnIndex) * columnWidth;
final int childRight = childLeft - lp.leftMargin - lp.rightMargin + columnWidth;
final int childWidth = childRight - childLeft;
final int childHeight = childBottom - childTop;
if (childWidth != childView.getMeasuredWidth() ||
childHeight != childView.getMeasuredHeight()) {
childView.measure(
MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY));
}
childView.layout(childLeft, childTop, childRight, childBottom);
columnIndex = (columnIndex + 1) % columnCount;
if (columnIndex == 0 && rowIndex + 1 < mRowCount) {
rowIndex++;
if (rowIndex + 1 == mRowCount) {
// Distribute the remainder evenly in the last row.
columnCount = getChildCount() - childIndex - 1;
columnWidth = (right - left - paddingLeft - paddingRight) / columnCount;
}
}
}
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new MarginLayoutParams(p);
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof MarginLayoutParams;
}
}
|
