PreferenceFrameLayout.java revision c57406cdfa1925c3474e87865c51950b76ee0347 
1/*
2 * Copyright (C) 2010 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
17package android.preference;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.util.AttributeSet;
22import android.view.View;
23import android.view.ViewGroup.MarginLayoutParams;
24import android.widget.FrameLayout;
25import android.widget.FrameLayout.LayoutParams;
26
27/**
28 * @hide
29 */
30public class PreferenceFrameLayout extends FrameLayout {
31    private static final int DEFAULT_BORDER_TOP = 0;
32    private static final int DEFAULT_BORDER_BOTTOM = 0;
33    private static final int DEFAULT_BORDER_LEFT = 0;
34    private static final int DEFAULT_BORDER_RIGHT = 0;
35    private final int mBorderTop;
36    private final int mBorderBottom;
37    private final int mBorderLeft;
38    private final int mBorderRight;
39    private boolean mPaddingApplied = false;
40
41    public PreferenceFrameLayout(Context context) {
42        this(context, null);
43    }
44
45    public PreferenceFrameLayout(Context context, AttributeSet attrs) {
46        this(context, attrs, com.android.internal.R.attr.preferenceFrameLayoutStyle);
47    }
48
49    public PreferenceFrameLayout(Context context, AttributeSet attrs, int defStyle) {
50        super(context, attrs, defStyle);
51        TypedArray a = context.obtainStyledAttributes(attrs,
52                com.android.internal.R.styleable.PreferenceFrameLayout, defStyle, 0);
53
54        float density = context.getResources().getDisplayMetrics().density;
55        int defaultBorderTop = (int) (density * DEFAULT_BORDER_TOP + 0.5f);
56        int defaultBottomPadding = (int) (density * DEFAULT_BORDER_BOTTOM + 0.5f);
57        int defaultLeftPadding = (int) (density * DEFAULT_BORDER_LEFT + 0.5f);
58        int defaultRightPadding = (int) (density * DEFAULT_BORDER_RIGHT + 0.5f);
59
60        mBorderTop = a.getDimensionPixelSize(
61                com.android.internal.R.styleable.PreferenceFrameLayout_borderTop,
62                defaultBorderTop);
63        mBorderBottom = a.getDimensionPixelSize(
64                com.android.internal.R.styleable.PreferenceFrameLayout_borderBottom,
65                defaultBottomPadding);
66        mBorderLeft = a.getDimensionPixelSize(
67                com.android.internal.R.styleable.PreferenceFrameLayout_borderLeft,
68                defaultLeftPadding);
69        mBorderRight = a.getDimensionPixelSize(
70                com.android.internal.R.styleable.PreferenceFrameLayout_borderRight,
71                defaultRightPadding);
72
73
74        a.recycle();
75    }
76
77    /**
78     * {@inheritDoc}
79     */
80    @Override
81    public LayoutParams generateLayoutParams(AttributeSet attrs) {
82        return new LayoutParams(getContext(), attrs);
83    }
84
85    @Override
86    public void addView(View child) {
87        int borderTop = getPaddingTop();
88        int borderBottom = getPaddingBottom();
89        int borderLeft = getPaddingLeft();
90        int borderRight = getPaddingRight();
91
92        android.view.ViewGroup.LayoutParams params = child.getLayoutParams();
93        LayoutParams layoutParams = params instanceof PreferenceFrameLayout.LayoutParams
94            ? (PreferenceFrameLayout.LayoutParams) child.getLayoutParams() : null;
95        // Check on the id of the child before adding it.
96        if (layoutParams != null && layoutParams.removeBorders) {
97            if (mPaddingApplied) {
98                borderTop -= mBorderTop;
99                borderBottom -= mBorderBottom;
100                borderLeft -= mBorderLeft;
101                borderRight -= mBorderRight;
102                mPaddingApplied = false;
103            }
104        } else {
105            // Add the padding to the view group after determining if the
106            // padding already exists.
107            if (!mPaddingApplied) {
108                borderTop += mBorderTop;
109                borderBottom += mBorderBottom;
110                borderLeft += mBorderLeft;
111                borderRight += mBorderRight;
112                mPaddingApplied = true;
113            }
114        }
115
116        int previousTop = getPaddingTop();
117        int previousBottom = getPaddingBottom();
118        int previousLeft = getPaddingLeft();
119        int previousRight = getPaddingRight();
120        if (previousTop != borderTop || previousBottom != borderBottom
121                || previousLeft != borderLeft || previousRight != borderRight) {
122            setPadding(borderLeft, borderTop, borderRight, borderBottom);
123        }
124
125        super.addView(child);
126    }
127
128    public static class LayoutParams extends FrameLayout.LayoutParams {
129        public boolean removeBorders = false;
130        /**
131         * {@inheritDoc}
132         */
133        public LayoutParams(Context c, AttributeSet attrs) {
134            super(c, attrs);
135
136            TypedArray a = c.obtainStyledAttributes(attrs,
137                    com.android.internal.R.styleable.PreferenceFrameLayout_Layout);
138            removeBorders = a.getBoolean(
139                    com.android.internal.R.styleable.PreferenceFrameLayout_Layout_layout_removeBorders,
140                    false);
141            a.recycle();
142        }
143
144        /**
145         * {@inheritDoc}
146         */
147        public LayoutParams(int width, int height) {
148            super(width, height);
149        }
150    }
151}