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.view.inspector.InspectableProperty; 25 import android.widget.RemoteViews.RemoteView; 26 27 28 /** 29 * A layout that lets you specify exact locations (x/y coordinates) of its 30 * children. Absolute layouts are less flexible and harder to maintain than 31 * other types of layouts without absolute positioning. 32 * 33 * <p><strong>XML attributes</strong></p> <p> See {@link 34 * android.R.styleable#ViewGroup ViewGroup Attributes}, {@link 35 * android.R.styleable#View View Attributes}</p> 36 * 37 * @deprecated Use {@link android.widget.FrameLayout}, {@link android.widget.RelativeLayout} 38 * or a custom layout instead. 39 */ 40 @Deprecated 41 @RemoteView 42 public class AbsoluteLayout extends ViewGroup { 43 public AbsoluteLayout(Context context) { 44 this(context, null); 45 } 46 47 public AbsoluteLayout(Context context, AttributeSet attrs) { 48 this(context, attrs, 0); 49 } 50 51 public AbsoluteLayout(Context context, AttributeSet attrs, int defStyleAttr) { 52 this(context, attrs, defStyleAttr, 0); 53 } 54 55 public AbsoluteLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 56 super(context, attrs, defStyleAttr, defStyleRes); 57 } 58 59 @Override 60 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 61 int count = getChildCount(); 62 63 int maxHeight = 0; 64 int maxWidth = 0; 65 66 // Find out how big everyone wants to be 67 measureChildren(widthMeasureSpec, heightMeasureSpec); 68 69 // Find rightmost and bottom-most child 70 for (int i = 0; i < count; i++) { 71 View child = getChildAt(i); 72 if (child.getVisibility() != GONE) { 73 int childRight; 74 int childBottom; 75 76 AbsoluteLayout.LayoutParams lp 77 = (AbsoluteLayout.LayoutParams) child.getLayoutParams(); 78 79 childRight = lp.x + child.getMeasuredWidth(); 80 childBottom = lp.y + child.getMeasuredHeight(); 81 82 maxWidth = Math.max(maxWidth, childRight); 83 maxHeight = Math.max(maxHeight, childBottom); 84 } 85 } 86 87 // Account for padding too 88 maxWidth += mPaddingLeft + mPaddingRight; 89 maxHeight += mPaddingTop + mPaddingBottom; 90 91 // Check against minimum height and width 92 maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); 93 maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); 94 95 setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, 0), 96 resolveSizeAndState(maxHeight, heightMeasureSpec, 0)); 97 } 98 99 /** 100 * Returns a set of layout parameters with a width of 101 * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}, 102 * a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} 103 * and with the coordinates (0, 0). 104 */ 105 @Override 106 protected ViewGroup.LayoutParams generateDefaultLayoutParams() { 107 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 0, 0); 108 } 109 110 @Override 111 protected void onLayout(boolean changed, int l, int t, 112 int r, int b) { 113 int count = getChildCount(); 114 115 for (int i = 0; i < count; i++) { 116 View child = getChildAt(i); 117 if (child.getVisibility() != GONE) { 118 119 AbsoluteLayout.LayoutParams lp = 120 (AbsoluteLayout.LayoutParams) child.getLayoutParams(); 121 122 int childLeft = mPaddingLeft + lp.x; 123 int childTop = mPaddingTop + lp.y; 124 child.layout(childLeft, childTop, 125 childLeft + child.getMeasuredWidth(), 126 childTop + child.getMeasuredHeight()); 127 128 } 129 } 130 } 131 132 @Override 133 public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) { 134 return new AbsoluteLayout.LayoutParams(getContext(), attrs); 135 } 136 137 // Override to allow type-checking of LayoutParams. 138 @Override 139 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 140 return p instanceof AbsoluteLayout.LayoutParams; 141 } 142 143 @Override 144 protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 145 return new LayoutParams(p); 146 } 147 148 @Override 149 public boolean shouldDelayChildPressedState() { 150 return false; 151 } 152 153 /** 154 * Per-child layout information associated with AbsoluteLayout. 155 * See 156 * {@link android.R.styleable#AbsoluteLayout_Layout Absolute Layout Attributes} 157 * for a list of all child view attributes that this class supports. 158 */ 159 public static class LayoutParams extends ViewGroup.LayoutParams { 160 /** 161 * The horizontal, or X, location of the child within the view group. 162 */ 163 @InspectableProperty(name = "layout_x") 164 public int x; 165 /** 166 * The vertical, or Y, location of the child within the view group. 167 */ 168 @InspectableProperty(name = "layout_y") 169 public int y; 170 171 /** 172 * Creates a new set of layout parameters with the specified width, 173 * height and location. 174 * 175 * @param width the width, either {@link #MATCH_PARENT}, 176 {@link #WRAP_CONTENT} or a fixed size in pixels 177 * @param height the height, either {@link #MATCH_PARENT}, 178 {@link #WRAP_CONTENT} or a fixed size in pixels 179 * @param x the X location of the child 180 * @param y the Y location of the child 181 */ 182 public LayoutParams(int width, int height, int x, int y) { 183 super(width, height); 184 this.x = x; 185 this.y = y; 186 } 187 188 /** 189 * Creates a new set of layout parameters. The values are extracted from 190 * the supplied attributes set and context. The XML attributes mapped 191 * to this set of layout parameters are: 192 * 193 * <ul> 194 * <li><code>layout_x</code>: the X location of the child</li> 195 * <li><code>layout_y</code>: the Y location of the child</li> 196 * <li>All the XML attributes from 197 * {@link android.view.ViewGroup.LayoutParams}</li> 198 * </ul> 199 * 200 * @param c the application environment 201 * @param attrs the set of attributes from which to extract the layout 202 * parameters values 203 */ 204 public LayoutParams(Context c, AttributeSet attrs) { 205 super(c, attrs); 206 TypedArray a = c.obtainStyledAttributes(attrs, 207 com.android.internal.R.styleable.AbsoluteLayout_Layout); 208 x = a.getDimensionPixelOffset( 209 com.android.internal.R.styleable.AbsoluteLayout_Layout_layout_x, 0); 210 y = a.getDimensionPixelOffset( 211 com.android.internal.R.styleable.AbsoluteLayout_Layout_layout_y, 0); 212 a.recycle(); 213 } 214 215 /** 216 * {@inheritDoc} 217 */ 218 public LayoutParams(ViewGroup.LayoutParams source) { 219 super(source); 220 } 221 222 @Override 223 public String debug(String output) { 224 return output + "Absolute.LayoutParams={width=" 225 + sizeToString(width) + ", height=" + sizeToString(height) 226 + " x=" + x + " y=" + y + "}"; 227 } 228 } 229 } 230 231 232
