1 /* 2 * Copyright (C) 2006 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.widget; 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.view.ViewGroup; 24 import android.widget.RemoteViews.RemoteView; 25 26 27 /** 28 * A layout that lets you specify exact locations (x/y coordinates) of its 29 * children. Absolute layouts are less flexible and harder to maintain than 30 * other types of layouts without absolute positioning. 31 * 32 * <p><strong>XML attributes</strong></p> <p> See {@link 33 * android.R.styleable#ViewGroup ViewGroup Attributes}, {@link 34 * android.R.styleable#View View Attributes}</p> 35 * 36 * @deprecated Use {@link android.widget.FrameLayout}, {@link android.widget.RelativeLayout} 37 * or a custom layout instead. 38 */ 39 @Deprecated 40 @RemoteView 41 public class AbsoluteLayout extends ViewGroup { 42 public AbsoluteLayout(Context context) { 43 this(context, null); 44 } 45 46 public AbsoluteLayout(Context context, AttributeSet attrs) { 47 this(context, attrs, 0); 48 } 49 50 public AbsoluteLayout(Context context, AttributeSet attrs, int defStyleAttr) { 51 this(context, attrs, defStyleAttr, 0); 52 } 53 54 public AbsoluteLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 55 super(context, attrs, defStyleAttr, defStyleRes); 56 } 57 58 @Override 59 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 60 int count = getChildCount(); 61 62 int maxHeight = 0; 63 int maxWidth = 0; 64 65 // Find out how big everyone wants to be 66 measureChildren(widthMeasureSpec, heightMeasureSpec); 67 68 // Find rightmost and bottom-most child 69 for (int i = 0; i < count; i++) { 70 View child = getChildAt(i); 71 if (child.getVisibility() != GONE) { 72 int childRight; 73 int childBottom; 74 75 AbsoluteLayout.LayoutParams lp 76 = (AbsoluteLayout.LayoutParams) child.getLayoutParams(); 77 78 childRight = lp.x + child.getMeasuredWidth(); 79 childBottom = lp.y + child.getMeasuredHeight(); 80 81 maxWidth = Math.max(maxWidth, childRight); 82 maxHeight = Math.max(maxHeight, childBottom); 83 } 84 } 85 86 // Account for padding too 87 maxWidth += mPaddingLeft + mPaddingRight; 88 maxHeight += mPaddingTop + mPaddingBottom; 89 90 // Check against minimum height and width 91 maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); 92 maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); 93 94 setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, 0), 95 resolveSizeAndState(maxHeight, heightMeasureSpec, 0)); 96 } 97 98 /** 99 * Returns a set of layout parameters with a width of 100 * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}, 101 * a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} 102 * and with the coordinates (0, 0). 103 */ 104 @Override 105 protected ViewGroup.LayoutParams generateDefaultLayoutParams() { 106 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 0, 0); 107 } 108 109 @Override 110 protected void onLayout(boolean changed, int l, int t, 111 int r, int b) { 112 int count = getChildCount(); 113 114 for (int i = 0; i < count; i++) { 115 View child = getChildAt(i); 116 if (child.getVisibility() != GONE) { 117 118 AbsoluteLayout.LayoutParams lp = 119 (AbsoluteLayout.LayoutParams) child.getLayoutParams(); 120 121 int childLeft = mPaddingLeft + lp.x; 122 int childTop = mPaddingTop + lp.y; 123 child.layout(childLeft, childTop, 124 childLeft + child.getMeasuredWidth(), 125 childTop + child.getMeasuredHeight()); 126 127 } 128 } 129 } 130 131 @Override 132 public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) { 133 return new AbsoluteLayout.LayoutParams(getContext(), attrs); 134 } 135 136 // Override to allow type-checking of LayoutParams. 137 @Override 138 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 139 return p instanceof AbsoluteLayout.LayoutParams; 140 } 141 142 @Override 143 protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 144 return new LayoutParams(p); 145 } 146 147 @Override 148 public boolean shouldDelayChildPressedState() { 149 return false; 150 } 151 152 /** 153 * Per-child layout information associated with AbsoluteLayout. 154 * See 155 * {@link android.R.styleable#AbsoluteLayout_Layout Absolute Layout Attributes} 156 * for a list of all child view attributes that this class supports. 157 */ 158 public static class LayoutParams extends ViewGroup.LayoutParams { 159 /** 160 * The horizontal, or X, location of the child within the view group. 161 */ 162 public int x; 163 /** 164 * The vertical, or Y, location of the child within the view group. 165 */ 166 public int y; 167 168 /** 169 * Creates a new set of layout parameters with the specified width, 170 * height and location. 171 * 172 * @param width the width, either {@link #MATCH_PARENT}, 173 {@link #WRAP_CONTENT} or a fixed size in pixels 174 * @param height the height, either {@link #MATCH_PARENT}, 175 {@link #WRAP_CONTENT} or a fixed size in pixels 176 * @param x the X location of the child 177 * @param y the Y location of the child 178 */ 179 public LayoutParams(int width, int height, int x, int y) { 180 super(width, height); 181 this.x = x; 182 this.y = y; 183 } 184 185 /** 186 * Creates a new set of layout parameters. The values are extracted from 187 * the supplied attributes set and context. The XML attributes mapped 188 * to this set of layout parameters are: 189 * 190 * <ul> 191 * <li><code>layout_x</code>: the X location of the child</li> 192 * <li><code>layout_y</code>: the Y location of the child</li> 193 * <li>All the XML attributes from 194 * {@link android.view.ViewGroup.LayoutParams}</li> 195 * </ul> 196 * 197 * @param c the application environment 198 * @param attrs the set of attributes from which to extract the layout 199 * parameters values 200 */ 201 public LayoutParams(Context c, AttributeSet attrs) { 202 super(c, attrs); 203 TypedArray a = c.obtainStyledAttributes(attrs, 204 com.android.internal.R.styleable.AbsoluteLayout_Layout); 205 x = a.getDimensionPixelOffset( 206 com.android.internal.R.styleable.AbsoluteLayout_Layout_layout_x, 0); 207 y = a.getDimensionPixelOffset( 208 com.android.internal.R.styleable.AbsoluteLayout_Layout_layout_y, 0); 209 a.recycle(); 210 } 211 212 /** 213 * {@inheritDoc} 214 */ 215 public LayoutParams(ViewGroup.LayoutParams source) { 216 super(source); 217 } 218 219 @Override 220 public String debug(String output) { 221 return output + "Absolute.LayoutParams={width=" 222 + sizeToString(width) + ", height=" + sizeToString(height) 223 + " x=" + x + " y=" + y + "}"; 224 } 225 } 226 } 227 228 229
