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 
17 package android.preference;
18 
19 import android.content.Context;
20 import android.content.res.TypedArray;
21 import android.util.AttributeSet;
22 import android.view.View;
23 import android.widget.FrameLayout;
24 
25 /**
26  * @hide
27  */
28 public 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 
PreferenceFrameLayout(Context context)39     public PreferenceFrameLayout(Context context) {
40         this(context, null);
41     }
42 
PreferenceFrameLayout(Context context, AttributeSet attrs)43     public PreferenceFrameLayout(Context context, AttributeSet attrs) {
44         this(context, attrs, com.android.internal.R.attr.preferenceFrameLayoutStyle);
45     }
46 
PreferenceFrameLayout(Context context, AttributeSet attrs, int defStyleAttr)47     public PreferenceFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
48         this(context, attrs, defStyleAttr, 0);
49     }
50 
PreferenceFrameLayout( Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)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
generateLayoutParams(AttributeSet attrs)83     public LayoutParams generateLayoutParams(AttributeSet attrs) {
84         return new LayoutParams(getContext(), attrs);
85     }
86 
87     @Override
addView(View child)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          */
LayoutParams(Context c, AttributeSet attrs)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          */
LayoutParams(int width, int height)149         public LayoutParams(int width, int height) {
150             super(width, height);
151         }
152     }
153 }