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.widget.FrameLayout;
24
25/**
26 * @hide
27 */
28public class PreferenceFrameLayout extends FrameLayout {
29    private static final int DEFAULT_BORDER_TOP = 0;
30    private static final int DEFAULT_BORDER_BOTTOM = 0;
31    private static final int DEFAULT_BORDER_LEFT = 0;
32    private static final int DEFAULT_BORDER_RIGHT = 0;
33    private final int mBorderTop;
34    private final int mBorderBottom;
35    private final int mBorderLeft;
36    private final int mBorderRight;
37    private boolean mPaddingApplied;
38
39    public PreferenceFrameLayout(Context context) {
40        this(context, null);
41    }
42
43    public PreferenceFrameLayout(Context context, AttributeSet attrs) {
44        this(context, attrs, com.android.internal.R.attr.preferenceFrameLayoutStyle);
45    }
46
47    public PreferenceFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
48        this(context, attrs, defStyleAttr, 0);
49    }
50
51    public PreferenceFrameLayout(
52            Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
53        super(context, attrs, defStyleAttr, defStyleRes);
54        final TypedArray a = context.obtainStyledAttributes(attrs,
55                com.android.internal.R.styleable.PreferenceFrameLayout, defStyleAttr, defStyleRes);
56
57        float density = context.getResources().getDisplayMetrics().density;
58        int defaultBorderTop = (int) (density * DEFAULT_BORDER_TOP + 0.5f);
59        int defaultBottomPadding = (int) (density * DEFAULT_BORDER_BOTTOM + 0.5f);
60        int defaultLeftPadding = (int) (density * DEFAULT_BORDER_LEFT + 0.5f);
61        int defaultRightPadding = (int) (density * DEFAULT_BORDER_RIGHT + 0.5f);
62
63        mBorderTop = a.getDimensionPixelSize(
64                com.android.internal.R.styleable.PreferenceFrameLayout_borderTop,
65                defaultBorderTop);
66        mBorderBottom = a.getDimensionPixelSize(
67                com.android.internal.R.styleable.PreferenceFrameLayout_borderBottom,
68                defaultBottomPadding);
69        mBorderLeft = a.getDimensionPixelSize(
70                com.android.internal.R.styleable.PreferenceFrameLayout_borderLeft,
71                defaultLeftPadding);
72        mBorderRight = a.getDimensionPixelSize(
73                com.android.internal.R.styleable.PreferenceFrameLayout_borderRight,
74                defaultRightPadding);
75
76        a.recycle();
77    }
78
79    /**
80     * {@inheritDoc}
81     */
82    @Override
83    public LayoutParams generateLayoutParams(AttributeSet attrs) {
84        return new LayoutParams(getContext(), attrs);
85    }
86
87    @Override
88    public void addView(View child) {
89        int borderTop = getPaddingTop();
90        int borderBottom = getPaddingBottom();
91        int borderLeft = getPaddingLeft();
92        int borderRight = getPaddingRight();
93
94        android.view.ViewGroup.LayoutParams params = child.getLayoutParams();
95        LayoutParams layoutParams = params instanceof PreferenceFrameLayout.LayoutParams
96            ? (PreferenceFrameLayout.LayoutParams) child.getLayoutParams() : null;
97        // Check on the id of the child before adding it.
98        if (layoutParams != null && layoutParams.removeBorders) {
99            if (mPaddingApplied) {
100                borderTop -= mBorderTop;
101                borderBottom -= mBorderBottom;
102                borderLeft -= mBorderLeft;
103                borderRight -= mBorderRight;
104                mPaddingApplied = false;
105            }
106        } else {
107            // Add the padding to the view group after determining if the
108            // padding already exists.
109            if (!mPaddingApplied) {
110                borderTop += mBorderTop;
111                borderBottom += mBorderBottom;
112                borderLeft += mBorderLeft;
113                borderRight += mBorderRight;
114                mPaddingApplied = true;
115            }
116        }
117
118        int previousTop = getPaddingTop();
119        int previousBottom = getPaddingBottom();
120        int previousLeft = getPaddingLeft();
121        int previousRight = getPaddingRight();
122        if (previousTop != borderTop || previousBottom != borderBottom
123                || previousLeft != borderLeft || previousRight != borderRight) {
124            setPadding(borderLeft, borderTop, borderRight, borderBottom);
125        }
126
127        super.addView(child);
128    }
129
130    public static class LayoutParams extends FrameLayout.LayoutParams {
131        public boolean removeBorders = false;
132        /**
133         * {@inheritDoc}
134         */
135        public LayoutParams(Context c, AttributeSet attrs) {
136            super(c, attrs);
137
138            TypedArray a = c.obtainStyledAttributes(attrs,
139                    com.android.internal.R.styleable.PreferenceFrameLayout_Layout);
140            removeBorders = a.getBoolean(
141                    com.android.internal.R.styleable.PreferenceFrameLayout_Layout_layout_removeBorders,
142                    false);
143            a.recycle();
144        }
145
146        /**
147         * {@inheritDoc}
148         */
149        public LayoutParams(int width, int height) {
150            super(width, height);
151        }
152    }
153}