PreferenceFrameLayout.java revision 617feb99a06e7ffb3894e86a286bf30e085f321a 
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.app.FragmentBreadCrumbs;
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.util.AttributeSet;
23import android.view.View;
24import android.widget.FrameLayout;
25
26/**
27 * @hide
28 */
29public class PreferenceFrameLayout extends FrameLayout {
30    private static final int DEFAULT_BORDER_TOP = 0;
31    private static final int DEFAULT_BORDER_BOTTOM = 0;
32    private static final int DEFAULT_BORDER_LEFT = 0;
33    private static final int DEFAULT_BORDER_RIGHT = 0;
34    private final int mBorderTop;
35    private final int mBorderBottom;
36    private final int mBorderLeft;
37    private final int mBorderRight;
38    private boolean mPaddingApplied;
39
40    public PreferenceFrameLayout(Context context) {
41        this(context, null);
42    }
43
44    public PreferenceFrameLayout(Context context, AttributeSet attrs) {
45        this(context, attrs, com.android.internal.R.attr.preferenceFrameLayoutStyle);
46    }
47
48    public PreferenceFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
49        this(context, attrs, defStyleAttr, 0);
50    }
51
52    public PreferenceFrameLayout(
53            Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
54        super(context, attrs, defStyleAttr, defStyleRes);
55        final TypedArray a = context.obtainStyledAttributes(attrs,
56                com.android.internal.R.styleable.PreferenceFrameLayout, defStyleAttr, defStyleRes);
57
58        float density = context.getResources().getDisplayMetrics().density;
59        int defaultBorderTop = (int) (density * DEFAULT_BORDER_TOP + 0.5f);
60        int defaultBottomPadding = (int) (density * DEFAULT_BORDER_BOTTOM + 0.5f);
61        int defaultLeftPadding = (int) (density * DEFAULT_BORDER_LEFT + 0.5f);
62        int defaultRightPadding = (int) (density * DEFAULT_BORDER_RIGHT + 0.5f);
63
64        mBorderTop = a.getDimensionPixelSize(
65                com.android.internal.R.styleable.PreferenceFrameLayout_borderTop,
66                defaultBorderTop);
67        mBorderBottom = a.getDimensionPixelSize(
68                com.android.internal.R.styleable.PreferenceFrameLayout_borderBottom,
69                defaultBottomPadding);
70        mBorderLeft = a.getDimensionPixelSize(
71                com.android.internal.R.styleable.PreferenceFrameLayout_borderLeft,
72                defaultLeftPadding);
73        mBorderRight = a.getDimensionPixelSize(
74                com.android.internal.R.styleable.PreferenceFrameLayout_borderRight,
75                defaultRightPadding);
76
77        a.recycle();
78    }
79
80    /**
81     * {@inheritDoc}
82     */
83    @Override
84    public LayoutParams generateLayoutParams(AttributeSet attrs) {
85        return new LayoutParams(getContext(), attrs);
86    }
87
88    @Override
89    public void addView(View child) {
90        int borderTop = getPaddingTop();
91        int borderBottom = getPaddingBottom();
92        int borderLeft = getPaddingLeft();
93        int borderRight = getPaddingRight();
94
95        android.view.ViewGroup.LayoutParams params = child.getLayoutParams();
96        LayoutParams layoutParams = params instanceof PreferenceFrameLayout.LayoutParams
97            ? (PreferenceFrameLayout.LayoutParams) child.getLayoutParams() : null;
98        // Check on the id of the child before adding it.
99        if (layoutParams != null && layoutParams.removeBorders) {
100            if (mPaddingApplied) {
101                borderTop -= mBorderTop;
102                borderBottom -= mBorderBottom;
103                borderLeft -= mBorderLeft;
104                borderRight -= mBorderRight;
105                mPaddingApplied = false;
106            }
107        } else {
108            // Add the padding to the view group after determining if the
109            // padding already exists.
110            if (!mPaddingApplied) {
111                borderTop += mBorderTop;
112                borderBottom += mBorderBottom;
113                borderLeft += mBorderLeft;
114                borderRight += mBorderRight;
115                mPaddingApplied = true;
116            }
117        }
118
119        int previousTop = getPaddingTop();
120        int previousBottom = getPaddingBottom();
121        int previousLeft = getPaddingLeft();
122        int previousRight = getPaddingRight();
123        if (previousTop != borderTop || previousBottom != borderBottom
124                || previousLeft != borderLeft || previousRight != borderRight) {
125            setPadding(borderLeft, borderTop, borderRight, borderBottom);
126        }
127
128        super.addView(child);
129    }
130
131    public static class LayoutParams extends FrameLayout.LayoutParams {
132        public boolean removeBorders = false;
133        /**
134         * {@inheritDoc}
135         */
136        public LayoutParams(Context c, AttributeSet attrs) {
137            super(c, attrs);
138
139            TypedArray a = c.obtainStyledAttributes(attrs,
140                    com.android.internal.R.styleable.PreferenceFrameLayout_Layout);
141            removeBorders = a.getBoolean(
142                    com.android.internal.R.styleable.PreferenceFrameLayout_Layout_layout_removeBorders,
143                    false);
144            a.recycle();
145        }
146
147        /**
148         * {@inheritDoc}
149         */
150        public LayoutParams(int width, int height) {
151            super(width, height);
152        }
153    }
154}