The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 | |
Gilles Debunne | f5c6eff | 2010-02-09 19:08:36 -0800 | [diff] [blame] | 19 | import com.android.internal.R; |
| 20 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | import android.content.Context; |
| 22 | import android.content.res.TypedArray; |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 23 | import android.graphics.Canvas; |
| 24 | import android.graphics.drawable.Drawable; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 25 | import android.util.AttributeSet; |
| 26 | import android.view.Gravity; |
| 27 | import android.view.View; |
| 28 | import android.view.ViewDebug; |
| 29 | import android.view.ViewGroup; |
| 30 | import android.widget.RemoteViews.RemoteView; |
| 31 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 32 | |
| 33 | /** |
| 34 | * A Layout that arranges its children in a single column or a single row. The direction of |
| 35 | * the row can be set by calling {@link #setOrientation(int) setOrientation()}. |
| 36 | * You can also specify gravity, which specifies the alignment of all the child elements by |
| 37 | * calling {@link #setGravity(int) setGravity()} or specify that specific children |
| 38 | * grow to fill up any remaining space in the layout by setting the <em>weight</em> member of |
| 39 | * {@link android.widget.LinearLayout.LayoutParams LinearLayout.LayoutParams}. |
| 40 | * The default orientation is horizontal. |
| 41 | * |
Scott Main | 41ec653 | 2010-08-19 16:57:07 -0700 | [diff] [blame] | 42 | * <p>See the <a href="{@docRoot}resources/tutorials/views/hello-linearlayout.html">Linear Layout |
| 43 | * tutorial</a>.</p> |
| 44 | * |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 45 | * <p> |
| 46 | * Also see {@link LinearLayout.LayoutParams android.widget.LinearLayout.LayoutParams} |
| 47 | * for layout attributes </p> |
Romain Guy | 9295ada | 2010-06-15 11:33:24 -0700 | [diff] [blame] | 48 | * |
| 49 | * @attr ref android.R.styleable#LinearLayout_baselineAligned |
| 50 | * @attr ref android.R.styleable#LinearLayout_baselineAlignedChildIndex |
| 51 | * @attr ref android.R.styleable#LinearLayout_gravity |
| 52 | * @attr ref android.R.styleable#LinearLayout_measureWithLargestChild |
| 53 | * @attr ref android.R.styleable#LinearLayout_orientation |
| 54 | * @attr ref android.R.styleable#LinearLayout_weightSum |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 55 | */ |
| 56 | @RemoteView |
| 57 | public class LinearLayout extends ViewGroup { |
| 58 | public static final int HORIZONTAL = 0; |
| 59 | public static final int VERTICAL = 1; |
| 60 | |
| 61 | /** |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 62 | * Don't show any dividers. |
| 63 | */ |
| 64 | public static final int SHOW_DIVIDER_NONE = 0; |
| 65 | /** |
| 66 | * Show a divider at the beginning of the group. |
| 67 | */ |
| 68 | public static final int SHOW_DIVIDER_BEGINNING = 1; |
| 69 | /** |
| 70 | * Show dividers between each item in the group. |
| 71 | */ |
| 72 | public static final int SHOW_DIVIDER_MIDDLE = 2; |
| 73 | /** |
| 74 | * Show a divider at the end of the group. |
| 75 | */ |
| 76 | public static final int SHOW_DIVIDER_END = 4; |
| 77 | |
| 78 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 79 | * Whether the children of this layout are baseline aligned. Only applicable |
| 80 | * if {@link #mOrientation} is horizontal. |
| 81 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 82 | @ViewDebug.ExportedProperty(category = "layout") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 83 | private boolean mBaselineAligned = true; |
| 84 | |
| 85 | /** |
| 86 | * If this layout is part of another layout that is baseline aligned, |
| 87 | * use the child at this index as the baseline. |
| 88 | * |
| 89 | * Note: this is orthogonal to {@link #mBaselineAligned}, which is concerned |
| 90 | * with whether the children of this layout are baseline aligned. |
| 91 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 92 | @ViewDebug.ExportedProperty(category = "layout") |
Karl Rosaen | c1f9c40 | 2009-08-12 17:18:33 -0700 | [diff] [blame] | 93 | private int mBaselineAlignedChildIndex = -1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 94 | |
| 95 | /** |
| 96 | * The additional offset to the child's baseline. |
| 97 | * We'll calculate the baseline of this layout as we measure vertically; for |
| 98 | * horizontal linear layouts, the offset of 0 is appropriate. |
| 99 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 100 | @ViewDebug.ExportedProperty(category = "measurement") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 101 | private int mBaselineChildTop = 0; |
| 102 | |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 103 | @ViewDebug.ExportedProperty(category = "measurement") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 104 | private int mOrientation; |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 105 | |
| 106 | @ViewDebug.ExportedProperty(category = "measurement", mapping = { |
Dianne Hackborn | d684784 | 2010-01-12 18:14:19 -0800 | [diff] [blame] | 107 | @ViewDebug.IntToString(from = -1, to = "NONE"), |
| 108 | @ViewDebug.IntToString(from = Gravity.NO_GRAVITY, to = "NONE"), |
| 109 | @ViewDebug.IntToString(from = Gravity.TOP, to = "TOP"), |
| 110 | @ViewDebug.IntToString(from = Gravity.BOTTOM, to = "BOTTOM"), |
| 111 | @ViewDebug.IntToString(from = Gravity.LEFT, to = "LEFT"), |
| 112 | @ViewDebug.IntToString(from = Gravity.RIGHT, to = "RIGHT"), |
| 113 | @ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL, to = "CENTER_VERTICAL"), |
| 114 | @ViewDebug.IntToString(from = Gravity.FILL_VERTICAL, to = "FILL_VERTICAL"), |
| 115 | @ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"), |
| 116 | @ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL, to = "FILL_HORIZONTAL"), |
| 117 | @ViewDebug.IntToString(from = Gravity.CENTER, to = "CENTER"), |
| 118 | @ViewDebug.IntToString(from = Gravity.FILL, to = "FILL") |
| 119 | }) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 120 | private int mGravity = Gravity.LEFT | Gravity.TOP; |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 121 | |
| 122 | @ViewDebug.ExportedProperty(category = "measurement") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 123 | private int mTotalLength; |
| 124 | |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 125 | @ViewDebug.ExportedProperty(category = "layout") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 126 | private float mWeightSum; |
| 127 | |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 128 | @ViewDebug.ExportedProperty(category = "layout") |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 129 | private boolean mUseLargestChild; |
| 130 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 131 | private int[] mMaxAscent; |
| 132 | private int[] mMaxDescent; |
| 133 | |
| 134 | private static final int VERTICAL_GRAVITY_COUNT = 4; |
| 135 | |
| 136 | private static final int INDEX_CENTER_VERTICAL = 0; |
| 137 | private static final int INDEX_TOP = 1; |
| 138 | private static final int INDEX_BOTTOM = 2; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 139 | private static final int INDEX_FILL = 3; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 140 | |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 141 | private Drawable mDivider; |
| 142 | private int mDividerWidth; |
| 143 | private int mDividerHeight; |
| 144 | private int mShowDividers; |
| 145 | private int mDividerPadding; |
| 146 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 147 | public LinearLayout(Context context) { |
| 148 | super(context); |
| 149 | } |
| 150 | |
| 151 | public LinearLayout(Context context, AttributeSet attrs) { |
Romain Guy | 9295ada | 2010-06-15 11:33:24 -0700 | [diff] [blame] | 152 | this(context, attrs, 0); |
| 153 | } |
| 154 | |
| 155 | public LinearLayout(Context context, AttributeSet attrs, int defStyle) { |
| 156 | super(context, attrs, defStyle); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 157 | |
Adam Powell | 3f7f7ac | 2010-12-05 16:44:38 -0800 | [diff] [blame] | 158 | TypedArray a = context.obtainStyledAttributes(attrs, |
| 159 | com.android.internal.R.styleable.LinearLayout, defStyle, 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 160 | |
| 161 | int index = a.getInt(com.android.internal.R.styleable.LinearLayout_orientation, -1); |
| 162 | if (index >= 0) { |
| 163 | setOrientation(index); |
| 164 | } |
| 165 | |
| 166 | index = a.getInt(com.android.internal.R.styleable.LinearLayout_gravity, -1); |
| 167 | if (index >= 0) { |
| 168 | setGravity(index); |
| 169 | } |
| 170 | |
| 171 | boolean baselineAligned = a.getBoolean(R.styleable.LinearLayout_baselineAligned, true); |
| 172 | if (!baselineAligned) { |
| 173 | setBaselineAligned(baselineAligned); |
| 174 | } |
| 175 | |
| 176 | mWeightSum = a.getFloat(R.styleable.LinearLayout_weightSum, -1.0f); |
| 177 | |
| 178 | mBaselineAlignedChildIndex = |
| 179 | a.getInt(com.android.internal.R.styleable.LinearLayout_baselineAlignedChildIndex, -1); |
| 180 | |
Romain Guy | 9295ada | 2010-06-15 11:33:24 -0700 | [diff] [blame] | 181 | mUseLargestChild = a.getBoolean(R.styleable.LinearLayout_measureWithLargestChild, false); |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 182 | |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 183 | setDividerDrawable(a.getDrawable(R.styleable.LinearLayout_divider)); |
| 184 | mShowDividers = a.getInt(R.styleable.LinearLayout_showDividers, SHOW_DIVIDER_NONE); |
| 185 | mDividerPadding = a.getDimensionPixelSize(R.styleable.LinearLayout_dividerPadding, 0); |
| 186 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 187 | a.recycle(); |
| 188 | } |
| 189 | |
| 190 | /** |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 191 | * Set how dividers should be shown between items in this layout |
| 192 | * |
| 193 | * @param showDividers One or more of {@link #SHOW_DIVIDER_BEGINNING}, |
| 194 | * {@link #SHOW_DIVIDER_MIDDLE}, or {@link #SHOW_DIVIDER_END}, |
| 195 | * or {@link #SHOW_DIVIDER_NONE} to show no dividers. |
| 196 | */ |
| 197 | public void setShowDividers(int showDividers) { |
| 198 | if (showDividers != mShowDividers) { |
| 199 | requestLayout(); |
| 200 | } |
| 201 | mShowDividers = showDividers; |
| 202 | } |
| 203 | |
Patrick Dubroy | e0a799a | 2011-05-04 16:19:22 -0700 | [diff] [blame] | 204 | @Override |
| 205 | public boolean shouldDelayChildPressedState() { |
| 206 | return false; |
| 207 | } |
| 208 | |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 209 | /** |
| 210 | * @return A flag set indicating how dividers should be shown around items. |
| 211 | * @see #setShowDividers(int) |
| 212 | */ |
| 213 | public int getShowDividers() { |
| 214 | return mShowDividers; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Set a drawable to be used as a divider between items. |
| 219 | * @param divider Drawable that will divide each item. |
| 220 | * @see #setShowDividers(int) |
| 221 | */ |
| 222 | public void setDividerDrawable(Drawable divider) { |
| 223 | if (divider == mDivider) { |
| 224 | return; |
| 225 | } |
| 226 | mDivider = divider; |
| 227 | if (divider != null) { |
| 228 | mDividerWidth = divider.getIntrinsicWidth(); |
| 229 | mDividerHeight = divider.getIntrinsicHeight(); |
| 230 | } else { |
| 231 | mDividerWidth = 0; |
| 232 | mDividerHeight = 0; |
| 233 | } |
| 234 | setWillNotDraw(divider == null); |
| 235 | requestLayout(); |
| 236 | } |
| 237 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 238 | /** |
| 239 | * Set padding displayed on both ends of dividers. |
| 240 | * |
| 241 | * @param padding Padding value in pixels that will be applied to each end |
| 242 | * |
| 243 | * @see #setShowDividers(int) |
| 244 | * @see #setDividerDrawable(Drawable) |
| 245 | * @see #getDividerPadding() |
| 246 | */ |
| 247 | public void setDividerPadding(int padding) { |
| 248 | mDividerPadding = padding; |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Get the padding size used to inset dividers in pixels |
| 253 | * |
| 254 | * @see #setShowDividers(int) |
| 255 | * @see #setDividerDrawable(Drawable) |
| 256 | * @see #setDividerPadding(int) |
| 257 | */ |
| 258 | public int getDividerPadding() { |
| 259 | return mDividerPadding; |
| 260 | } |
| 261 | |
Adam Powell | 640a66e | 2011-04-29 10:18:53 -0700 | [diff] [blame] | 262 | /** |
| 263 | * Get the width of the current divider drawable. |
| 264 | * |
| 265 | * @hide Used internally by framework. |
| 266 | */ |
| 267 | public int getDividerWidth() { |
| 268 | return mDividerWidth; |
| 269 | } |
| 270 | |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 271 | @Override |
| 272 | protected void onDraw(Canvas canvas) { |
| 273 | if (mDivider == null) { |
| 274 | return; |
| 275 | } |
| 276 | |
| 277 | if (mOrientation == VERTICAL) { |
| 278 | drawDividersVertical(canvas); |
| 279 | } else { |
| 280 | drawDividersHorizontal(canvas); |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | void drawDividersVertical(Canvas canvas) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 285 | final int count = getVirtualChildCount(); |
| 286 | int top = getPaddingTop(); |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 287 | for (int i = 0; i < count; i++) { |
| 288 | final View child = getVirtualChildAt(i); |
| 289 | |
| 290 | if (child == null) { |
| 291 | top += measureNullChild(i); |
| 292 | } else if (child.getVisibility() != GONE) { |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 293 | if (hasDividerBeforeChildAt(i)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 294 | drawHorizontalDivider(canvas, top); |
| 295 | top += mDividerHeight; |
| 296 | } |
| 297 | |
| 298 | LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| 299 | top += lp.topMargin + child.getHeight() + lp.bottomMargin; |
| 300 | } |
| 301 | } |
| 302 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 303 | if (hasDividerBeforeChildAt(count)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 304 | drawHorizontalDivider(canvas, top); |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | void drawDividersHorizontal(Canvas canvas) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 309 | final int count = getVirtualChildCount(); |
| 310 | int left = getPaddingLeft(); |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 311 | for (int i = 0; i < count; i++) { |
| 312 | final View child = getVirtualChildAt(i); |
| 313 | |
| 314 | if (child == null) { |
| 315 | left += measureNullChild(i); |
| 316 | } else if (child.getVisibility() != GONE) { |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 317 | if (hasDividerBeforeChildAt(i)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 318 | drawVerticalDivider(canvas, left); |
| 319 | left += mDividerWidth; |
| 320 | } |
| 321 | |
| 322 | LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| 323 | left += lp.leftMargin + child.getWidth() + lp.rightMargin; |
| 324 | } |
| 325 | } |
| 326 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 327 | if (hasDividerBeforeChildAt(count)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 328 | drawVerticalDivider(canvas, left); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | void drawHorizontalDivider(Canvas canvas, int top) { |
| 333 | mDivider.setBounds(getPaddingLeft() + mDividerPadding, top, |
| 334 | getWidth() - getPaddingRight() - mDividerPadding, top + mDividerHeight); |
| 335 | mDivider.draw(canvas); |
| 336 | } |
| 337 | |
| 338 | void drawVerticalDivider(Canvas canvas, int left) { |
| 339 | mDivider.setBounds(left, getPaddingTop() + mDividerPadding, |
| 340 | left + mDividerWidth, getHeight() - getPaddingBottom() - mDividerPadding); |
| 341 | mDivider.draw(canvas); |
| 342 | } |
| 343 | |
| 344 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 345 | * <p>Indicates whether widgets contained within this layout are aligned |
| 346 | * on their baseline or not.</p> |
| 347 | * |
| 348 | * @return true when widgets are baseline-aligned, false otherwise |
| 349 | */ |
| 350 | public boolean isBaselineAligned() { |
| 351 | return mBaselineAligned; |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * <p>Defines whether widgets contained in this layout are |
| 356 | * baseline-aligned or not.</p> |
| 357 | * |
| 358 | * @param baselineAligned true to align widgets on their baseline, |
| 359 | * false otherwise |
| 360 | * |
| 361 | * @attr ref android.R.styleable#LinearLayout_baselineAligned |
| 362 | */ |
| 363 | @android.view.RemotableViewMethod |
| 364 | public void setBaselineAligned(boolean baselineAligned) { |
| 365 | mBaselineAligned = baselineAligned; |
| 366 | } |
| 367 | |
Romain Guy | 9295ada | 2010-06-15 11:33:24 -0700 | [diff] [blame] | 368 | /** |
| 369 | * When true, all children with a weight will be considered having |
| 370 | * the minimum size of the largest child. If false, all children are |
| 371 | * measured normally. |
| 372 | * |
| 373 | * @return True to measure children with a weight using the minimum |
| 374 | * size of the largest child, false otherwise. |
| 375 | */ |
| 376 | public boolean isMeasureWithLargestChildEnabled() { |
| 377 | return mUseLargestChild; |
| 378 | } |
| 379 | |
| 380 | /** |
| 381 | * When set to true, all children with a weight will be considered having |
| 382 | * the minimum size of the largest child. If false, all children are |
| 383 | * measured normally. |
| 384 | * |
| 385 | * Disabled by default. |
| 386 | * |
| 387 | * @param enabled True to measure children with a weight using the |
| 388 | * minimum size of the largest child, false otherwise. |
| 389 | */ |
| 390 | @android.view.RemotableViewMethod |
| 391 | public void setMeasureWithLargestChildEnabled(boolean enabled) { |
| 392 | mUseLargestChild = enabled; |
| 393 | } |
| 394 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 395 | @Override |
| 396 | public int getBaseline() { |
| 397 | if (mBaselineAlignedChildIndex < 0) { |
| 398 | return super.getBaseline(); |
| 399 | } |
| 400 | |
| 401 | if (getChildCount() <= mBaselineAlignedChildIndex) { |
| 402 | throw new RuntimeException("mBaselineAlignedChildIndex of LinearLayout " |
| 403 | + "set to an index that is out of bounds."); |
| 404 | } |
| 405 | |
| 406 | final View child = getChildAt(mBaselineAlignedChildIndex); |
| 407 | final int childBaseline = child.getBaseline(); |
| 408 | |
| 409 | if (childBaseline == -1) { |
| 410 | if (mBaselineAlignedChildIndex == 0) { |
| 411 | // this is just the default case, safe to return -1 |
| 412 | return -1; |
| 413 | } |
| 414 | // the user picked an index that points to something that doesn't |
| 415 | // know how to calculate its baseline. |
| 416 | throw new RuntimeException("mBaselineAlignedChildIndex of LinearLayout " |
| 417 | + "points to a View that doesn't know how to get its baseline."); |
| 418 | } |
| 419 | |
| 420 | // TODO: This should try to take into account the virtual offsets |
| 421 | // (See getNextLocationOffset and getLocationOffset) |
| 422 | // We should add to childTop: |
| 423 | // sum([getNextLocationOffset(getChildAt(i)) / i < mBaselineAlignedChildIndex]) |
| 424 | // and also add: |
| 425 | // getLocationOffset(child) |
| 426 | int childTop = mBaselineChildTop; |
| 427 | |
| 428 | if (mOrientation == VERTICAL) { |
| 429 | final int majorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; |
| 430 | if (majorGravity != Gravity.TOP) { |
| 431 | switch (majorGravity) { |
| 432 | case Gravity.BOTTOM: |
| 433 | childTop = mBottom - mTop - mPaddingBottom - mTotalLength; |
| 434 | break; |
| 435 | |
| 436 | case Gravity.CENTER_VERTICAL: |
| 437 | childTop += ((mBottom - mTop - mPaddingTop - mPaddingBottom) - |
| 438 | mTotalLength) / 2; |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 445 | return childTop + lp.topMargin + childBaseline; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * @return The index of the child that will be used if this layout is |
| 450 | * part of a larger layout that is baseline aligned, or -1 if none has |
| 451 | * been set. |
| 452 | */ |
| 453 | public int getBaselineAlignedChildIndex() { |
| 454 | return mBaselineAlignedChildIndex; |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * @param i The index of the child that will be used if this layout is |
| 459 | * part of a larger layout that is baseline aligned. |
| 460 | * |
| 461 | * @attr ref android.R.styleable#LinearLayout_baselineAlignedChildIndex |
| 462 | */ |
| 463 | @android.view.RemotableViewMethod |
| 464 | public void setBaselineAlignedChildIndex(int i) { |
| 465 | if ((i < 0) || (i >= getChildCount())) { |
| 466 | throw new IllegalArgumentException("base aligned child index out " |
| 467 | + "of range (0, " + getChildCount() + ")"); |
| 468 | } |
| 469 | mBaselineAlignedChildIndex = i; |
| 470 | } |
| 471 | |
| 472 | /** |
| 473 | * <p>Returns the view at the specified index. This method can be overriden |
| 474 | * to take into account virtual children. Refer to |
| 475 | * {@link android.widget.TableLayout} and {@link android.widget.TableRow} |
| 476 | * for an example.</p> |
| 477 | * |
| 478 | * @param index the child's index |
| 479 | * @return the child at the specified index |
| 480 | */ |
| 481 | View getVirtualChildAt(int index) { |
| 482 | return getChildAt(index); |
| 483 | } |
| 484 | |
| 485 | /** |
| 486 | * <p>Returns the virtual number of children. This number might be different |
| 487 | * than the actual number of children if the layout can hold virtual |
| 488 | * children. Refer to |
| 489 | * {@link android.widget.TableLayout} and {@link android.widget.TableRow} |
| 490 | * for an example.</p> |
| 491 | * |
| 492 | * @return the virtual number of children |
| 493 | */ |
| 494 | int getVirtualChildCount() { |
| 495 | return getChildCount(); |
| 496 | } |
| 497 | |
| 498 | /** |
| 499 | * Returns the desired weights sum. |
| 500 | * |
| 501 | * @return A number greater than 0.0f if the weight sum is defined, or |
| 502 | * a number lower than or equals to 0.0f if not weight sum is |
| 503 | * to be used. |
| 504 | */ |
| 505 | public float getWeightSum() { |
| 506 | return mWeightSum; |
| 507 | } |
| 508 | |
| 509 | /** |
| 510 | * Defines the desired weights sum. If unspecified the weights sum is computed |
| 511 | * at layout time by adding the layout_weight of each child. |
| 512 | * |
| 513 | * This can be used for instance to give a single child 50% of the total |
| 514 | * available space by giving it a layout_weight of 0.5 and setting the |
| 515 | * weightSum to 1.0. |
| 516 | * |
| 517 | * @param weightSum a number greater than 0.0f, or a number lower than or equals |
| 518 | * to 0.0f if the weight sum should be computed from the children's |
| 519 | * layout_weight |
| 520 | */ |
| 521 | @android.view.RemotableViewMethod |
| 522 | public void setWeightSum(float weightSum) { |
| 523 | mWeightSum = Math.max(0.0f, weightSum); |
| 524 | } |
| 525 | |
| 526 | @Override |
| 527 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 528 | if (mOrientation == VERTICAL) { |
| 529 | measureVertical(widthMeasureSpec, heightMeasureSpec); |
| 530 | } else { |
| 531 | measureHorizontal(widthMeasureSpec, heightMeasureSpec); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | /** |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 536 | * Determines where to position dividers between children. |
| 537 | * |
| 538 | * @param childIndex Index of child to check for preceding divider |
| 539 | * @return true if there should be a divider before the child at childIndex |
| 540 | * @hide Pending API consideration. Currently only used internally by the system. |
| 541 | */ |
| 542 | protected boolean hasDividerBeforeChildAt(int childIndex) { |
| 543 | if (childIndex == 0) { |
| 544 | return (mShowDividers & SHOW_DIVIDER_BEGINNING) != 0; |
| 545 | } else if (childIndex == getChildCount()) { |
| 546 | return (mShowDividers & SHOW_DIVIDER_END) != 0; |
| 547 | } else { |
| 548 | return (mShowDividers & SHOW_DIVIDER_MIDDLE) != 0; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 553 | * Measures the children when the orientation of this LinearLayout is set |
| 554 | * to {@link #VERTICAL}. |
| 555 | * |
| 556 | * @param widthMeasureSpec Horizontal space requirements as imposed by the parent. |
| 557 | * @param heightMeasureSpec Vertical space requirements as imposed by the parent. |
| 558 | * |
| 559 | * @see #getOrientation() |
| 560 | * @see #setOrientation(int) |
| 561 | * @see #onMeasure(int, int) |
| 562 | */ |
| 563 | void measureVertical(int widthMeasureSpec, int heightMeasureSpec) { |
| 564 | mTotalLength = 0; |
| 565 | int maxWidth = 0; |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 566 | int childState = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 567 | int alternativeMaxWidth = 0; |
| 568 | int weightedMaxWidth = 0; |
| 569 | boolean allFillParent = true; |
| 570 | float totalWeight = 0; |
| 571 | |
| 572 | final int count = getVirtualChildCount(); |
| 573 | |
| 574 | final int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 575 | final int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 576 | |
| 577 | boolean matchWidth = false; |
| 578 | |
| 579 | final int baselineChildIndex = mBaselineAlignedChildIndex; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 580 | final boolean useLargestChild = mUseLargestChild; |
| 581 | |
| 582 | int largestChildHeight = Integer.MIN_VALUE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 583 | |
| 584 | // See how tall everyone is. Also remember max width. |
| 585 | for (int i = 0; i < count; ++i) { |
| 586 | final View child = getVirtualChildAt(i); |
| 587 | |
| 588 | if (child == null) { |
| 589 | mTotalLength += measureNullChild(i); |
| 590 | continue; |
| 591 | } |
| 592 | |
| 593 | if (child.getVisibility() == View.GONE) { |
| 594 | i += getChildrenSkipCount(child, i); |
| 595 | continue; |
| 596 | } |
| 597 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 598 | if (hasDividerBeforeChildAt(i)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 599 | mTotalLength += mDividerHeight; |
| 600 | } |
| 601 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 602 | LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 603 | |
| 604 | totalWeight += lp.weight; |
| 605 | |
| 606 | if (heightMode == MeasureSpec.EXACTLY && lp.height == 0 && lp.weight > 0) { |
| 607 | // Optimization: don't bother measuring children who are going to use |
| 608 | // leftover space. These views will get measured again down below if |
| 609 | // there is any leftover space. |
Romain Guy | 053b480 | 2010-02-05 15:34:33 -0800 | [diff] [blame] | 610 | final int totalLength = mTotalLength; |
| 611 | mTotalLength = Math.max(totalLength, totalLength + lp.topMargin + lp.bottomMargin); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 612 | } else { |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 613 | int oldHeight = Integer.MIN_VALUE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 614 | |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 615 | if (lp.height == 0 && lp.weight > 0) { |
Gilles Debunne | f5c6eff | 2010-02-09 19:08:36 -0800 | [diff] [blame] | 616 | // heightMode is either UNSPECIFIED or AT_MOST, and this |
| 617 | // child wanted to stretch to fill available space. |
| 618 | // Translate that to WRAP_CONTENT so that it does not end up |
| 619 | // with a height of 0 |
| 620 | oldHeight = 0; |
| 621 | lp.height = LayoutParams.WRAP_CONTENT; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 622 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 623 | |
Gilles Debunne | f5c6eff | 2010-02-09 19:08:36 -0800 | [diff] [blame] | 624 | // Determine how big this child would like to be. If this or |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 625 | // previous children have given a weight, then we allow it to |
| 626 | // use all available space (and we will shrink things later |
| 627 | // if needed). |
| 628 | measureChildBeforeLayout( |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 629 | child, i, widthMeasureSpec, 0, heightMeasureSpec, |
| 630 | totalWeight == 0 ? mTotalLength : 0); |
| 631 | |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 632 | if (oldHeight != Integer.MIN_VALUE) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 633 | lp.height = oldHeight; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 634 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 635 | |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 636 | final int childHeight = child.getMeasuredHeight(); |
Romain Guy | 053b480 | 2010-02-05 15:34:33 -0800 | [diff] [blame] | 637 | final int totalLength = mTotalLength; |
| 638 | mTotalLength = Math.max(totalLength, totalLength + childHeight + lp.topMargin + |
| 639 | lp.bottomMargin + getNextLocationOffset(child)); |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 640 | |
| 641 | if (useLargestChild) { |
| 642 | largestChildHeight = Math.max(childHeight, largestChildHeight); |
| 643 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | /** |
| 647 | * If applicable, compute the additional offset to the child's baseline |
| 648 | * we'll need later when asked {@link #getBaseline}. |
| 649 | */ |
| 650 | if ((baselineChildIndex >= 0) && (baselineChildIndex == i + 1)) { |
| 651 | mBaselineChildTop = mTotalLength; |
| 652 | } |
| 653 | |
| 654 | // if we are trying to use a child index for our baseline, the above |
| 655 | // book keeping only works if there are no children above it with |
| 656 | // weight. fail fast to aid the developer. |
| 657 | if (i < baselineChildIndex && lp.weight > 0) { |
| 658 | throw new RuntimeException("A child of LinearLayout with index " |
| 659 | + "less than mBaselineAlignedChildIndex has weight > 0, which " |
| 660 | + "won't work. Either remove the weight, or don't set " |
| 661 | + "mBaselineAlignedChildIndex."); |
| 662 | } |
| 663 | |
| 664 | boolean matchWidthLocally = false; |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 665 | if (widthMode != MeasureSpec.EXACTLY && lp.width == LayoutParams.MATCH_PARENT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 666 | // The width of the linear layout will scale, and at least one |
| 667 | // child said it wanted to match our width. Set a flag |
| 668 | // indicating that we need to remeasure at least that view when |
| 669 | // we know our width. |
| 670 | matchWidth = true; |
| 671 | matchWidthLocally = true; |
| 672 | } |
| 673 | |
| 674 | final int margin = lp.leftMargin + lp.rightMargin; |
| 675 | final int measuredWidth = child.getMeasuredWidth() + margin; |
| 676 | maxWidth = Math.max(maxWidth, measuredWidth); |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 677 | childState = combineMeasuredStates(childState, child.getMeasuredState()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 678 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 679 | allFillParent = allFillParent && lp.width == LayoutParams.MATCH_PARENT; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 680 | if (lp.weight > 0) { |
| 681 | /* |
| 682 | * Widths of weighted Views are bogus if we end up |
| 683 | * remeasuring, so keep them separate. |
| 684 | */ |
| 685 | weightedMaxWidth = Math.max(weightedMaxWidth, |
| 686 | matchWidthLocally ? margin : measuredWidth); |
| 687 | } else { |
| 688 | alternativeMaxWidth = Math.max(alternativeMaxWidth, |
| 689 | matchWidthLocally ? margin : measuredWidth); |
| 690 | } |
| 691 | |
| 692 | i += getChildrenSkipCount(child, i); |
| 693 | } |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 694 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 695 | if (mTotalLength > 0 && hasDividerBeforeChildAt(count)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 696 | mTotalLength += mDividerHeight; |
| 697 | } |
| 698 | |
Romain Guy | ff65c8c | 2010-01-23 10:21:12 -0800 | [diff] [blame] | 699 | if (useLargestChild && heightMode == MeasureSpec.AT_MOST) { |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 700 | mTotalLength = 0; |
| 701 | |
| 702 | for (int i = 0; i < count; ++i) { |
| 703 | final View child = getVirtualChildAt(i); |
| 704 | |
| 705 | if (child == null) { |
| 706 | mTotalLength += measureNullChild(i); |
| 707 | continue; |
| 708 | } |
| 709 | |
| 710 | if (child.getVisibility() == GONE) { |
| 711 | i += getChildrenSkipCount(child, i); |
| 712 | continue; |
| 713 | } |
| 714 | |
| 715 | final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) |
| 716 | child.getLayoutParams(); |
Romain Guy | 053b480 | 2010-02-05 15:34:33 -0800 | [diff] [blame] | 717 | // Account for negative margins |
| 718 | final int totalLength = mTotalLength; |
| 719 | mTotalLength = Math.max(totalLength, totalLength + largestChildHeight + |
| 720 | lp.topMargin + lp.bottomMargin + getNextLocationOffset(child)); |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 721 | } |
| 722 | } |
| 723 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 724 | // Add in our padding |
| 725 | mTotalLength += mPaddingTop + mPaddingBottom; |
| 726 | |
| 727 | int heightSize = mTotalLength; |
| 728 | |
| 729 | // Check against our minimum height |
| 730 | heightSize = Math.max(heightSize, getSuggestedMinimumHeight()); |
| 731 | |
| 732 | // Reconcile our calculated size with the heightMeasureSpec |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 733 | int heightSizeAndState = resolveSizeAndState(heightSize, heightMeasureSpec, 0); |
| 734 | heightSize = heightSizeAndState & MEASURED_SIZE_MASK; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 735 | |
| 736 | // Either expand children with weight to take up available space or |
| 737 | // shrink them if they extend beyond our current bounds |
| 738 | int delta = heightSize - mTotalLength; |
| 739 | if (delta != 0 && totalWeight > 0.0f) { |
| 740 | float weightSum = mWeightSum > 0.0f ? mWeightSum : totalWeight; |
| 741 | |
| 742 | mTotalLength = 0; |
| 743 | |
| 744 | for (int i = 0; i < count; ++i) { |
| 745 | final View child = getVirtualChildAt(i); |
| 746 | |
| 747 | if (child.getVisibility() == View.GONE) { |
| 748 | continue; |
| 749 | } |
| 750 | |
| 751 | LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 752 | |
| 753 | float childExtra = lp.weight; |
| 754 | if (childExtra > 0) { |
| 755 | // Child said it could absorb extra space -- give him his share |
| 756 | int share = (int) (childExtra * delta / weightSum); |
| 757 | weightSum -= childExtra; |
| 758 | delta -= share; |
| 759 | |
| 760 | final int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, |
| 761 | mPaddingLeft + mPaddingRight + |
| 762 | lp.leftMargin + lp.rightMargin, lp.width); |
| 763 | |
| 764 | // TODO: Use a field like lp.isMeasured to figure out if this |
| 765 | // child has been previously measured |
| 766 | if ((lp.height != 0) || (heightMode != MeasureSpec.EXACTLY)) { |
| 767 | // child was measured once already above... |
| 768 | // base new measurement on stored values |
| 769 | int childHeight = child.getMeasuredHeight() + share; |
| 770 | if (childHeight < 0) { |
| 771 | childHeight = 0; |
| 772 | } |
| 773 | |
| 774 | child.measure(childWidthMeasureSpec, |
| 775 | MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY)); |
| 776 | } else { |
| 777 | // child was skipped in the loop above. |
| 778 | // Measure for this first time here |
| 779 | child.measure(childWidthMeasureSpec, |
| 780 | MeasureSpec.makeMeasureSpec(share > 0 ? share : 0, |
| 781 | MeasureSpec.EXACTLY)); |
| 782 | } |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 783 | |
| 784 | // Child may now not fit in vertical dimension. |
| 785 | childState = combineMeasuredStates(childState, child.getMeasuredState() |
| 786 | & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 787 | } |
| 788 | |
| 789 | final int margin = lp.leftMargin + lp.rightMargin; |
| 790 | final int measuredWidth = child.getMeasuredWidth() + margin; |
| 791 | maxWidth = Math.max(maxWidth, measuredWidth); |
| 792 | |
| 793 | boolean matchWidthLocally = widthMode != MeasureSpec.EXACTLY && |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 794 | lp.width == LayoutParams.MATCH_PARENT; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 795 | |
| 796 | alternativeMaxWidth = Math.max(alternativeMaxWidth, |
| 797 | matchWidthLocally ? margin : measuredWidth); |
| 798 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 799 | allFillParent = allFillParent && lp.width == LayoutParams.MATCH_PARENT; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 800 | |
Romain Guy | 053b480 | 2010-02-05 15:34:33 -0800 | [diff] [blame] | 801 | final int totalLength = mTotalLength; |
| 802 | mTotalLength = Math.max(totalLength, totalLength + child.getMeasuredHeight() + |
| 803 | lp.topMargin + lp.bottomMargin + getNextLocationOffset(child)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | // Add in our padding |
Romain Guy | 053b480 | 2010-02-05 15:34:33 -0800 | [diff] [blame] | 807 | mTotalLength += mPaddingTop + mPaddingBottom; |
| 808 | // TODO: Should we recompute the heightSpec based on the new total length? |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 809 | } else { |
| 810 | alternativeMaxWidth = Math.max(alternativeMaxWidth, |
| 811 | weightedMaxWidth); |
| 812 | } |
| 813 | |
| 814 | if (!allFillParent && widthMode != MeasureSpec.EXACTLY) { |
| 815 | maxWidth = alternativeMaxWidth; |
| 816 | } |
| 817 | |
| 818 | maxWidth += mPaddingLeft + mPaddingRight; |
| 819 | |
| 820 | // Check against our minimum width |
| 821 | maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); |
| 822 | |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 823 | setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, childState), |
| 824 | heightSizeAndState); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 825 | |
| 826 | if (matchWidth) { |
| 827 | forceUniformWidth(count, heightMeasureSpec); |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | private void forceUniformWidth(int count, int heightMeasureSpec) { |
| 832 | // Pretend that the linear layout has an exact size. |
| 833 | int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), |
| 834 | MeasureSpec.EXACTLY); |
| 835 | for (int i = 0; i< count; ++i) { |
| 836 | final View child = getVirtualChildAt(i); |
| 837 | if (child.getVisibility() != GONE) { |
| 838 | LinearLayout.LayoutParams lp = ((LinearLayout.LayoutParams)child.getLayoutParams()); |
| 839 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 840 | if (lp.width == LayoutParams.MATCH_PARENT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 841 | // Temporarily force children to reuse their old measured height |
| 842 | // FIXME: this may not be right for something like wrapping text? |
| 843 | int oldHeight = lp.height; |
| 844 | lp.height = child.getMeasuredHeight(); |
| 845 | |
| 846 | // Remeasue with new dimensions |
| 847 | measureChildWithMargins(child, uniformMeasureSpec, 0, heightMeasureSpec, 0); |
| 848 | lp.height = oldHeight; |
| 849 | } |
| 850 | } |
| 851 | } |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * Measures the children when the orientation of this LinearLayout is set |
| 856 | * to {@link #HORIZONTAL}. |
| 857 | * |
| 858 | * @param widthMeasureSpec Horizontal space requirements as imposed by the parent. |
| 859 | * @param heightMeasureSpec Vertical space requirements as imposed by the parent. |
| 860 | * |
| 861 | * @see #getOrientation() |
| 862 | * @see #setOrientation(int) |
| 863 | * @see #onMeasure(int, int) |
| 864 | */ |
| 865 | void measureHorizontal(int widthMeasureSpec, int heightMeasureSpec) { |
| 866 | mTotalLength = 0; |
| 867 | int maxHeight = 0; |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 868 | int childState = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 869 | int alternativeMaxHeight = 0; |
| 870 | int weightedMaxHeight = 0; |
| 871 | boolean allFillParent = true; |
| 872 | float totalWeight = 0; |
| 873 | |
| 874 | final int count = getVirtualChildCount(); |
| 875 | |
| 876 | final int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 877 | final int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 878 | |
| 879 | boolean matchHeight = false; |
| 880 | |
| 881 | if (mMaxAscent == null || mMaxDescent == null) { |
| 882 | mMaxAscent = new int[VERTICAL_GRAVITY_COUNT]; |
| 883 | mMaxDescent = new int[VERTICAL_GRAVITY_COUNT]; |
| 884 | } |
| 885 | |
| 886 | final int[] maxAscent = mMaxAscent; |
| 887 | final int[] maxDescent = mMaxDescent; |
| 888 | |
| 889 | maxAscent[0] = maxAscent[1] = maxAscent[2] = maxAscent[3] = -1; |
| 890 | maxDescent[0] = maxDescent[1] = maxDescent[2] = maxDescent[3] = -1; |
| 891 | |
| 892 | final boolean baselineAligned = mBaselineAligned; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 893 | final boolean useLargestChild = mUseLargestChild; |
Romain Guy | c352090 | 2010-02-25 11:01:01 -0800 | [diff] [blame] | 894 | |
| 895 | final boolean isExactly = widthMode == MeasureSpec.EXACTLY; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 896 | |
| 897 | int largestChildWidth = Integer.MIN_VALUE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 898 | |
| 899 | // See how wide everyone is. Also remember max height. |
| 900 | for (int i = 0; i < count; ++i) { |
| 901 | final View child = getVirtualChildAt(i); |
| 902 | |
| 903 | if (child == null) { |
| 904 | mTotalLength += measureNullChild(i); |
| 905 | continue; |
| 906 | } |
| 907 | |
| 908 | if (child.getVisibility() == GONE) { |
| 909 | i += getChildrenSkipCount(child, i); |
| 910 | continue; |
| 911 | } |
| 912 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 913 | if (hasDividerBeforeChildAt(i)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 914 | mTotalLength += mDividerWidth; |
| 915 | } |
| 916 | |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 917 | final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) |
| 918 | child.getLayoutParams(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 919 | |
| 920 | totalWeight += lp.weight; |
| 921 | |
| 922 | if (widthMode == MeasureSpec.EXACTLY && lp.width == 0 && lp.weight > 0) { |
| 923 | // Optimization: don't bother measuring children who are going to use |
| 924 | // leftover space. These views will get measured again down below if |
| 925 | // there is any leftover space. |
Romain Guy | c352090 | 2010-02-25 11:01:01 -0800 | [diff] [blame] | 926 | if (isExactly) { |
| 927 | mTotalLength += lp.leftMargin + lp.rightMargin; |
| 928 | } else { |
| 929 | final int totalLength = mTotalLength; |
| 930 | mTotalLength = Math.max(totalLength, totalLength + |
| 931 | lp.leftMargin + lp.rightMargin); |
| 932 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 933 | |
| 934 | // Baseline alignment requires to measure widgets to obtain the |
Romain Guy | 6c5664a | 2010-02-24 18:55:22 -0800 | [diff] [blame] | 935 | // baseline offset (in particular for TextViews). The following |
| 936 | // defeats the optimization mentioned above. Allow the child to |
| 937 | // use as much space as it wants because we can shrink things |
| 938 | // later (and re-measure). |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 939 | if (baselineAligned) { |
| 940 | final int freeSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 941 | child.measure(freeSpec, freeSpec); |
| 942 | } |
| 943 | } else { |
| 944 | int oldWidth = Integer.MIN_VALUE; |
| 945 | |
| 946 | if (lp.width == 0 && lp.weight > 0) { |
Gilles Debunne | f5c6eff | 2010-02-09 19:08:36 -0800 | [diff] [blame] | 947 | // widthMode is either UNSPECIFIED or AT_MOST, and this |
| 948 | // child |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 949 | // wanted to stretch to fill available space. Translate that to |
| 950 | // WRAP_CONTENT so that it does not end up with a width of 0 |
| 951 | oldWidth = 0; |
| 952 | lp.width = LayoutParams.WRAP_CONTENT; |
| 953 | } |
| 954 | |
| 955 | // Determine how big this child would like to be. If this or |
| 956 | // previous children have given a weight, then we allow it to |
| 957 | // use all available space (and we will shrink things later |
| 958 | // if needed). |
| 959 | measureChildBeforeLayout(child, i, widthMeasureSpec, |
| 960 | totalWeight == 0 ? mTotalLength : 0, |
| 961 | heightMeasureSpec, 0); |
| 962 | |
| 963 | if (oldWidth != Integer.MIN_VALUE) { |
| 964 | lp.width = oldWidth; |
| 965 | } |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 966 | |
| 967 | final int childWidth = child.getMeasuredWidth(); |
Romain Guy | c352090 | 2010-02-25 11:01:01 -0800 | [diff] [blame] | 968 | if (isExactly) { |
| 969 | mTotalLength += childWidth + lp.leftMargin + lp.rightMargin + |
| 970 | getNextLocationOffset(child); |
| 971 | } else { |
| 972 | final int totalLength = mTotalLength; |
| 973 | mTotalLength = Math.max(totalLength, totalLength + childWidth + lp.leftMargin + |
| 974 | lp.rightMargin + getNextLocationOffset(child)); |
| 975 | } |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 976 | |
| 977 | if (useLargestChild) { |
| 978 | largestChildWidth = Math.max(childWidth, largestChildWidth); |
| 979 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 980 | } |
| 981 | |
| 982 | boolean matchHeightLocally = false; |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 983 | if (heightMode != MeasureSpec.EXACTLY && lp.height == LayoutParams.MATCH_PARENT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 984 | // The height of the linear layout will scale, and at least one |
| 985 | // child said it wanted to match our height. Set a flag indicating that |
| 986 | // we need to remeasure at least that view when we know our height. |
| 987 | matchHeight = true; |
| 988 | matchHeightLocally = true; |
| 989 | } |
| 990 | |
| 991 | final int margin = lp.topMargin + lp.bottomMargin; |
| 992 | final int childHeight = child.getMeasuredHeight() + margin; |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 993 | childState = combineMeasuredStates(childState, child.getMeasuredState()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 994 | |
| 995 | if (baselineAligned) { |
| 996 | final int childBaseline = child.getBaseline(); |
| 997 | if (childBaseline != -1) { |
| 998 | // Translates the child's vertical gravity into an index |
| 999 | // in the range 0..VERTICAL_GRAVITY_COUNT |
| 1000 | final int gravity = (lp.gravity < 0 ? mGravity : lp.gravity) |
| 1001 | & Gravity.VERTICAL_GRAVITY_MASK; |
| 1002 | final int index = ((gravity >> Gravity.AXIS_Y_SHIFT) |
| 1003 | & ~Gravity.AXIS_SPECIFIED) >> 1; |
| 1004 | |
| 1005 | maxAscent[index] = Math.max(maxAscent[index], childBaseline); |
| 1006 | maxDescent[index] = Math.max(maxDescent[index], childHeight - childBaseline); |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | maxHeight = Math.max(maxHeight, childHeight); |
| 1011 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1012 | allFillParent = allFillParent && lp.height == LayoutParams.MATCH_PARENT; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1013 | if (lp.weight > 0) { |
| 1014 | /* |
| 1015 | * Heights of weighted Views are bogus if we end up |
| 1016 | * remeasuring, so keep them separate. |
| 1017 | */ |
| 1018 | weightedMaxHeight = Math.max(weightedMaxHeight, |
| 1019 | matchHeightLocally ? margin : childHeight); |
| 1020 | } else { |
| 1021 | alternativeMaxHeight = Math.max(alternativeMaxHeight, |
| 1022 | matchHeightLocally ? margin : childHeight); |
| 1023 | } |
| 1024 | |
| 1025 | i += getChildrenSkipCount(child, i); |
| 1026 | } |
| 1027 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 1028 | if (mTotalLength > 0 && hasDividerBeforeChildAt(count)) { |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 1029 | mTotalLength += mDividerWidth; |
| 1030 | } |
| 1031 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1032 | // Check mMaxAscent[INDEX_TOP] first because it maps to Gravity.TOP, |
| 1033 | // the most common case |
| 1034 | if (maxAscent[INDEX_TOP] != -1 || |
| 1035 | maxAscent[INDEX_CENTER_VERTICAL] != -1 || |
| 1036 | maxAscent[INDEX_BOTTOM] != -1 || |
| 1037 | maxAscent[INDEX_FILL] != -1) { |
| 1038 | final int ascent = Math.max(maxAscent[INDEX_FILL], |
| 1039 | Math.max(maxAscent[INDEX_CENTER_VERTICAL], |
| 1040 | Math.max(maxAscent[INDEX_TOP], maxAscent[INDEX_BOTTOM]))); |
| 1041 | final int descent = Math.max(maxDescent[INDEX_FILL], |
| 1042 | Math.max(maxDescent[INDEX_CENTER_VERTICAL], |
| 1043 | Math.max(maxDescent[INDEX_TOP], maxDescent[INDEX_BOTTOM]))); |
| 1044 | maxHeight = Math.max(maxHeight, ascent + descent); |
| 1045 | } |
| 1046 | |
Romain Guy | cf635ae | 2010-01-22 11:00:29 -0800 | [diff] [blame] | 1047 | if (useLargestChild && widthMode == MeasureSpec.AT_MOST) { |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 1048 | mTotalLength = 0; |
| 1049 | |
| 1050 | for (int i = 0; i < count; ++i) { |
| 1051 | final View child = getVirtualChildAt(i); |
| 1052 | |
| 1053 | if (child == null) { |
| 1054 | mTotalLength += measureNullChild(i); |
| 1055 | continue; |
| 1056 | } |
| 1057 | |
| 1058 | if (child.getVisibility() == GONE) { |
| 1059 | i += getChildrenSkipCount(child, i); |
| 1060 | continue; |
| 1061 | } |
| 1062 | |
| 1063 | final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) |
| 1064 | child.getLayoutParams(); |
Romain Guy | c352090 | 2010-02-25 11:01:01 -0800 | [diff] [blame] | 1065 | if (isExactly) { |
| 1066 | mTotalLength += largestChildWidth + lp.leftMargin + lp.rightMargin + |
| 1067 | getNextLocationOffset(child); |
| 1068 | } else { |
| 1069 | final int totalLength = mTotalLength; |
| 1070 | mTotalLength = Math.max(totalLength, totalLength + largestChildWidth + |
| 1071 | lp.leftMargin + lp.rightMargin + getNextLocationOffset(child)); |
| 1072 | } |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 1073 | } |
| 1074 | } |
| 1075 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1076 | // Add in our padding |
| 1077 | mTotalLength += mPaddingLeft + mPaddingRight; |
| 1078 | |
| 1079 | int widthSize = mTotalLength; |
| 1080 | |
| 1081 | // Check against our minimum width |
| 1082 | widthSize = Math.max(widthSize, getSuggestedMinimumWidth()); |
| 1083 | |
| 1084 | // Reconcile our calculated size with the widthMeasureSpec |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1085 | int widthSizeAndState = resolveSizeAndState(widthSize, widthMeasureSpec, 0); |
| 1086 | widthSize = widthSizeAndState & MEASURED_SIZE_MASK; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1087 | |
| 1088 | // Either expand children with weight to take up available space or |
| 1089 | // shrink them if they extend beyond our current bounds |
| 1090 | int delta = widthSize - mTotalLength; |
| 1091 | if (delta != 0 && totalWeight > 0.0f) { |
| 1092 | float weightSum = mWeightSum > 0.0f ? mWeightSum : totalWeight; |
| 1093 | |
| 1094 | maxAscent[0] = maxAscent[1] = maxAscent[2] = maxAscent[3] = -1; |
| 1095 | maxDescent[0] = maxDescent[1] = maxDescent[2] = maxDescent[3] = -1; |
| 1096 | maxHeight = -1; |
| 1097 | |
| 1098 | mTotalLength = 0; |
| 1099 | |
| 1100 | for (int i = 0; i < count; ++i) { |
| 1101 | final View child = getVirtualChildAt(i); |
| 1102 | |
| 1103 | if (child == null || child.getVisibility() == View.GONE) { |
| 1104 | continue; |
| 1105 | } |
| 1106 | |
| 1107 | final LinearLayout.LayoutParams lp = |
| 1108 | (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 1109 | |
| 1110 | float childExtra = lp.weight; |
| 1111 | if (childExtra > 0) { |
| 1112 | // Child said it could absorb extra space -- give him his share |
| 1113 | int share = (int) (childExtra * delta / weightSum); |
| 1114 | weightSum -= childExtra; |
| 1115 | delta -= share; |
| 1116 | |
| 1117 | final int childHeightMeasureSpec = getChildMeasureSpec( |
| 1118 | heightMeasureSpec, |
| 1119 | mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin, |
| 1120 | lp.height); |
| 1121 | |
| 1122 | // TODO: Use a field like lp.isMeasured to figure out if this |
| 1123 | // child has been previously measured |
| 1124 | if ((lp.width != 0) || (widthMode != MeasureSpec.EXACTLY)) { |
| 1125 | // child was measured once already above ... base new measurement |
| 1126 | // on stored values |
| 1127 | int childWidth = child.getMeasuredWidth() + share; |
| 1128 | if (childWidth < 0) { |
| 1129 | childWidth = 0; |
| 1130 | } |
| 1131 | |
| 1132 | child.measure( |
| 1133 | MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY), |
| 1134 | childHeightMeasureSpec); |
| 1135 | } else { |
| 1136 | // child was skipped in the loop above. Measure for this first time here |
| 1137 | child.measure(MeasureSpec.makeMeasureSpec( |
| 1138 | share > 0 ? share : 0, MeasureSpec.EXACTLY), |
| 1139 | childHeightMeasureSpec); |
| 1140 | } |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1141 | |
| 1142 | // Child may now not fit in horizontal dimension. |
| 1143 | childState = combineMeasuredStates(childState, |
| 1144 | child.getMeasuredState() & MEASURED_STATE_MASK); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1145 | } |
| 1146 | |
Romain Guy | c352090 | 2010-02-25 11:01:01 -0800 | [diff] [blame] | 1147 | if (isExactly) { |
| 1148 | mTotalLength += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin + |
| 1149 | getNextLocationOffset(child); |
| 1150 | } else { |
| 1151 | final int totalLength = mTotalLength; |
| 1152 | mTotalLength = Math.max(totalLength, totalLength + child.getMeasuredWidth() + |
| 1153 | lp.leftMargin + lp.rightMargin + getNextLocationOffset(child)); |
| 1154 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1155 | |
| 1156 | boolean matchHeightLocally = heightMode != MeasureSpec.EXACTLY && |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1157 | lp.height == LayoutParams.MATCH_PARENT; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1158 | |
| 1159 | final int margin = lp.topMargin + lp .bottomMargin; |
| 1160 | int childHeight = child.getMeasuredHeight() + margin; |
| 1161 | maxHeight = Math.max(maxHeight, childHeight); |
| 1162 | alternativeMaxHeight = Math.max(alternativeMaxHeight, |
| 1163 | matchHeightLocally ? margin : childHeight); |
| 1164 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1165 | allFillParent = allFillParent && lp.height == LayoutParams.MATCH_PARENT; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1166 | |
| 1167 | if (baselineAligned) { |
| 1168 | final int childBaseline = child.getBaseline(); |
| 1169 | if (childBaseline != -1) { |
| 1170 | // Translates the child's vertical gravity into an index in the range 0..2 |
| 1171 | final int gravity = (lp.gravity < 0 ? mGravity : lp.gravity) |
| 1172 | & Gravity.VERTICAL_GRAVITY_MASK; |
| 1173 | final int index = ((gravity >> Gravity.AXIS_Y_SHIFT) |
| 1174 | & ~Gravity.AXIS_SPECIFIED) >> 1; |
| 1175 | |
| 1176 | maxAscent[index] = Math.max(maxAscent[index], childBaseline); |
| 1177 | maxDescent[index] = Math.max(maxDescent[index], |
| 1178 | childHeight - childBaseline); |
| 1179 | } |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | // Add in our padding |
| 1184 | mTotalLength += mPaddingLeft + mPaddingRight; |
Romain Guy | 053b480 | 2010-02-05 15:34:33 -0800 | [diff] [blame] | 1185 | // TODO: Should we update widthSize with the new total length? |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1186 | |
| 1187 | // Check mMaxAscent[INDEX_TOP] first because it maps to Gravity.TOP, |
| 1188 | // the most common case |
| 1189 | if (maxAscent[INDEX_TOP] != -1 || |
| 1190 | maxAscent[INDEX_CENTER_VERTICAL] != -1 || |
| 1191 | maxAscent[INDEX_BOTTOM] != -1 || |
| 1192 | maxAscent[INDEX_FILL] != -1) { |
| 1193 | final int ascent = Math.max(maxAscent[INDEX_FILL], |
| 1194 | Math.max(maxAscent[INDEX_CENTER_VERTICAL], |
| 1195 | Math.max(maxAscent[INDEX_TOP], maxAscent[INDEX_BOTTOM]))); |
| 1196 | final int descent = Math.max(maxDescent[INDEX_FILL], |
| 1197 | Math.max(maxDescent[INDEX_CENTER_VERTICAL], |
| 1198 | Math.max(maxDescent[INDEX_TOP], maxDescent[INDEX_BOTTOM]))); |
| 1199 | maxHeight = Math.max(maxHeight, ascent + descent); |
| 1200 | } |
| 1201 | } else { |
| 1202 | alternativeMaxHeight = Math.max(alternativeMaxHeight, weightedMaxHeight); |
| 1203 | } |
| 1204 | |
| 1205 | if (!allFillParent && heightMode != MeasureSpec.EXACTLY) { |
| 1206 | maxHeight = alternativeMaxHeight; |
| 1207 | } |
| 1208 | |
| 1209 | maxHeight += mPaddingTop + mPaddingBottom; |
| 1210 | |
| 1211 | // Check against our minimum height |
| 1212 | maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); |
| 1213 | |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1214 | setMeasuredDimension(widthSizeAndState | (childState&MEASURED_STATE_MASK), |
| 1215 | resolveSizeAndState(maxHeight, heightMeasureSpec, |
| 1216 | (childState<<MEASURED_HEIGHT_STATE_SHIFT))); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1217 | |
| 1218 | if (matchHeight) { |
| 1219 | forceUniformHeight(count, widthMeasureSpec); |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | private void forceUniformHeight(int count, int widthMeasureSpec) { |
| 1224 | // Pretend that the linear layout has an exact size. This is the measured height of |
| 1225 | // ourselves. The measured height should be the max height of the children, changed |
| 1226 | // to accomodate the heightMesureSpec from the parent |
| 1227 | int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(), |
| 1228 | MeasureSpec.EXACTLY); |
| 1229 | for (int i = 0; i < count; ++i) { |
| 1230 | final View child = getVirtualChildAt(i); |
| 1231 | if (child.getVisibility() != GONE) { |
| 1232 | LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 1233 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1234 | if (lp.height == LayoutParams.MATCH_PARENT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1235 | // Temporarily force children to reuse their old measured width |
| 1236 | // FIXME: this may not be right for something like wrapping text? |
| 1237 | int oldWidth = lp.width; |
| 1238 | lp.width = child.getMeasuredWidth(); |
| 1239 | |
| 1240 | // Remeasure with new dimensions |
| 1241 | measureChildWithMargins(child, widthMeasureSpec, 0, uniformMeasureSpec, 0); |
| 1242 | lp.width = oldWidth; |
| 1243 | } |
| 1244 | } |
| 1245 | } |
| 1246 | } |
| 1247 | |
| 1248 | /** |
| 1249 | * <p>Returns the number of children to skip after measuring/laying out |
| 1250 | * the specified child.</p> |
| 1251 | * |
| 1252 | * @param child the child after which we want to skip children |
| 1253 | * @param index the index of the child after which we want to skip children |
| 1254 | * @return the number of children to skip, 0 by default |
| 1255 | */ |
| 1256 | int getChildrenSkipCount(View child, int index) { |
| 1257 | return 0; |
| 1258 | } |
| 1259 | |
| 1260 | /** |
| 1261 | * <p>Returns the size (width or height) that should be occupied by a null |
| 1262 | * child.</p> |
| 1263 | * |
| 1264 | * @param childIndex the index of the null child |
| 1265 | * @return the width or height of the child depending on the orientation |
| 1266 | */ |
| 1267 | int measureNullChild(int childIndex) { |
| 1268 | return 0; |
| 1269 | } |
| 1270 | |
| 1271 | /** |
| 1272 | * <p>Measure the child according to the parent's measure specs. This |
| 1273 | * method should be overriden by subclasses to force the sizing of |
| 1274 | * children. This method is called by {@link #measureVertical(int, int)} and |
| 1275 | * {@link #measureHorizontal(int, int)}.</p> |
| 1276 | * |
| 1277 | * @param child the child to measure |
| 1278 | * @param childIndex the index of the child in this view |
| 1279 | * @param widthMeasureSpec horizontal space requirements as imposed by the parent |
| 1280 | * @param totalWidth extra space that has been used up by the parent horizontally |
| 1281 | * @param heightMeasureSpec vertical space requirements as imposed by the parent |
| 1282 | * @param totalHeight extra space that has been used up by the parent vertically |
| 1283 | */ |
| 1284 | void measureChildBeforeLayout(View child, int childIndex, |
| 1285 | int widthMeasureSpec, int totalWidth, int heightMeasureSpec, |
| 1286 | int totalHeight) { |
| 1287 | measureChildWithMargins(child, widthMeasureSpec, totalWidth, |
| 1288 | heightMeasureSpec, totalHeight); |
| 1289 | } |
| 1290 | |
| 1291 | /** |
| 1292 | * <p>Return the location offset of the specified child. This can be used |
| 1293 | * by subclasses to change the location of a given widget.</p> |
| 1294 | * |
| 1295 | * @param child the child for which to obtain the location offset |
| 1296 | * @return the location offset in pixels |
| 1297 | */ |
| 1298 | int getLocationOffset(View child) { |
| 1299 | return 0; |
| 1300 | } |
| 1301 | |
| 1302 | /** |
| 1303 | * <p>Return the size offset of the next sibling of the specified child. |
| 1304 | * This can be used by subclasses to change the location of the widget |
| 1305 | * following <code>child</code>.</p> |
| 1306 | * |
| 1307 | * @param child the child whose next sibling will be moved |
| 1308 | * @return the location offset of the next child in pixels |
| 1309 | */ |
| 1310 | int getNextLocationOffset(View child) { |
| 1311 | return 0; |
| 1312 | } |
| 1313 | |
| 1314 | @Override |
| 1315 | protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| 1316 | if (mOrientation == VERTICAL) { |
| 1317 | layoutVertical(); |
| 1318 | } else { |
| 1319 | layoutHorizontal(); |
| 1320 | } |
| 1321 | } |
| 1322 | |
| 1323 | /** |
| 1324 | * Position the children during a layout pass if the orientation of this |
| 1325 | * LinearLayout is set to {@link #VERTICAL}. |
| 1326 | * |
| 1327 | * @see #getOrientation() |
| 1328 | * @see #setOrientation(int) |
| 1329 | * @see #onLayout(boolean, int, int, int, int) |
| 1330 | */ |
| 1331 | void layoutVertical() { |
| 1332 | final int paddingLeft = mPaddingLeft; |
| 1333 | |
| 1334 | int childTop = mPaddingTop; |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 1335 | int childLeft; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1336 | |
| 1337 | // Where right end of child should go |
| 1338 | final int width = mRight - mLeft; |
| 1339 | int childRight = width - mPaddingRight; |
| 1340 | |
| 1341 | // Space available for child |
| 1342 | int childSpace = width - paddingLeft - mPaddingRight; |
| 1343 | |
| 1344 | final int count = getVirtualChildCount(); |
| 1345 | |
| 1346 | final int majorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; |
| 1347 | final int minorGravity = mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; |
| 1348 | |
| 1349 | if (majorGravity != Gravity.TOP) { |
| 1350 | switch (majorGravity) { |
| 1351 | case Gravity.BOTTOM: |
| 1352 | // mTotalLength contains the padding already, we add the top |
| 1353 | // padding to compensate |
| 1354 | childTop = mBottom - mTop + mPaddingTop - mTotalLength; |
| 1355 | break; |
| 1356 | |
| 1357 | case Gravity.CENTER_VERTICAL: |
| 1358 | childTop += ((mBottom - mTop) - mTotalLength) / 2; |
| 1359 | break; |
| 1360 | } |
| 1361 | |
| 1362 | } |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 1363 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1364 | for (int i = 0; i < count; i++) { |
| 1365 | final View child = getVirtualChildAt(i); |
| 1366 | if (child == null) { |
| 1367 | childTop += measureNullChild(i); |
| 1368 | } else if (child.getVisibility() != GONE) { |
| 1369 | final int childWidth = child.getMeasuredWidth(); |
| 1370 | final int childHeight = child.getMeasuredHeight(); |
| 1371 | |
| 1372 | final LinearLayout.LayoutParams lp = |
| 1373 | (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 1374 | |
| 1375 | int gravity = lp.gravity; |
| 1376 | if (gravity < 0) { |
| 1377 | gravity = minorGravity; |
| 1378 | } |
| 1379 | |
| 1380 | switch (gravity & Gravity.HORIZONTAL_GRAVITY_MASK) { |
| 1381 | case Gravity.LEFT: |
| 1382 | childLeft = paddingLeft + lp.leftMargin; |
| 1383 | break; |
| 1384 | |
| 1385 | case Gravity.CENTER_HORIZONTAL: |
| 1386 | childLeft = paddingLeft + ((childSpace - childWidth) / 2) |
| 1387 | + lp.leftMargin - lp.rightMargin; |
| 1388 | break; |
| 1389 | |
| 1390 | case Gravity.RIGHT: |
| 1391 | childLeft = childRight - childWidth - lp.rightMargin; |
| 1392 | break; |
Romain Guy | 611cd3f | 2009-12-15 12:00:37 -0800 | [diff] [blame] | 1393 | default: |
| 1394 | childLeft = paddingLeft; |
| 1395 | break; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1396 | } |
| 1397 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 1398 | if (hasDividerBeforeChildAt(i)) { |
| 1399 | childTop += mDividerHeight; |
| 1400 | } |
| 1401 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1402 | childTop += lp.topMargin; |
| 1403 | setChildFrame(child, childLeft, childTop + getLocationOffset(child), |
| 1404 | childWidth, childHeight); |
| 1405 | childTop += childHeight + lp.bottomMargin + getNextLocationOffset(child); |
| 1406 | |
| 1407 | i += getChildrenSkipCount(child, i); |
| 1408 | } |
| 1409 | } |
| 1410 | } |
| 1411 | |
| 1412 | /** |
| 1413 | * Position the children during a layout pass if the orientation of this |
| 1414 | * LinearLayout is set to {@link #HORIZONTAL}. |
| 1415 | * |
| 1416 | * @see #getOrientation() |
| 1417 | * @see #setOrientation(int) |
| 1418 | * @see #onLayout(boolean, int, int, int, int) |
| 1419 | */ |
| 1420 | void layoutHorizontal() { |
| 1421 | final int paddingTop = mPaddingTop; |
| 1422 | |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 1423 | int childTop; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1424 | int childLeft = mPaddingLeft; |
| 1425 | |
| 1426 | // Where bottom of child should go |
| 1427 | final int height = mBottom - mTop; |
| 1428 | int childBottom = height - mPaddingBottom; |
| 1429 | |
| 1430 | // Space available for child |
| 1431 | int childSpace = height - paddingTop - mPaddingBottom; |
| 1432 | |
| 1433 | final int count = getVirtualChildCount(); |
| 1434 | |
| 1435 | final int majorGravity = mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; |
| 1436 | final int minorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; |
| 1437 | |
| 1438 | final boolean baselineAligned = mBaselineAligned; |
| 1439 | |
| 1440 | final int[] maxAscent = mMaxAscent; |
| 1441 | final int[] maxDescent = mMaxDescent; |
| 1442 | |
| 1443 | if (majorGravity != Gravity.LEFT) { |
| 1444 | switch (majorGravity) { |
| 1445 | case Gravity.RIGHT: |
| 1446 | // mTotalLength contains the padding already, we add the left |
| 1447 | // padding to compensate |
| 1448 | childLeft = mRight - mLeft + mPaddingLeft - mTotalLength; |
| 1449 | break; |
| 1450 | |
| 1451 | case Gravity.CENTER_HORIZONTAL: |
| 1452 | childLeft += ((mRight - mLeft) - mTotalLength) / 2; |
| 1453 | break; |
| 1454 | } |
Adam Powell | fcca00a | 2010-11-30 21:26:29 -0800 | [diff] [blame] | 1455 | } |
| 1456 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1457 | for (int i = 0; i < count; i++) { |
| 1458 | final View child = getVirtualChildAt(i); |
| 1459 | |
| 1460 | if (child == null) { |
| 1461 | childLeft += measureNullChild(i); |
| 1462 | } else if (child.getVisibility() != GONE) { |
| 1463 | final int childWidth = child.getMeasuredWidth(); |
| 1464 | final int childHeight = child.getMeasuredHeight(); |
| 1465 | int childBaseline = -1; |
| 1466 | |
| 1467 | final LinearLayout.LayoutParams lp = |
| 1468 | (LinearLayout.LayoutParams) child.getLayoutParams(); |
| 1469 | |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1470 | if (baselineAligned && lp.height != LayoutParams.MATCH_PARENT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1471 | childBaseline = child.getBaseline(); |
| 1472 | } |
| 1473 | |
| 1474 | int gravity = lp.gravity; |
| 1475 | if (gravity < 0) { |
| 1476 | gravity = minorGravity; |
| 1477 | } |
| 1478 | |
| 1479 | switch (gravity & Gravity.VERTICAL_GRAVITY_MASK) { |
| 1480 | case Gravity.TOP: |
| 1481 | childTop = paddingTop + lp.topMargin; |
| 1482 | if (childBaseline != -1) { |
| 1483 | childTop += maxAscent[INDEX_TOP] - childBaseline; |
| 1484 | } |
| 1485 | break; |
| 1486 | |
| 1487 | case Gravity.CENTER_VERTICAL: |
Romain Guy | 5b1b241 | 2010-01-21 19:09:51 -0800 | [diff] [blame] | 1488 | // Removed support for baseline alignment when layout_gravity or |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1489 | // gravity == center_vertical. See bug #1038483. |
| 1490 | // Keep the code around if we need to re-enable this feature |
| 1491 | // if (childBaseline != -1) { |
| 1492 | // // Align baselines vertically only if the child is smaller than us |
| 1493 | // if (childSpace - childHeight > 0) { |
| 1494 | // childTop = paddingTop + (childSpace / 2) - childBaseline; |
| 1495 | // } else { |
| 1496 | // childTop = paddingTop + (childSpace - childHeight) / 2; |
| 1497 | // } |
| 1498 | // } else { |
| 1499 | childTop = paddingTop + ((childSpace - childHeight) / 2) |
| 1500 | + lp.topMargin - lp.bottomMargin; |
| 1501 | break; |
| 1502 | |
| 1503 | case Gravity.BOTTOM: |
| 1504 | childTop = childBottom - childHeight - lp.bottomMargin; |
| 1505 | if (childBaseline != -1) { |
| 1506 | int descent = child.getMeasuredHeight() - childBaseline; |
| 1507 | childTop -= (maxDescent[INDEX_BOTTOM] - descent); |
| 1508 | } |
| 1509 | break; |
Romain Guy | 611cd3f | 2009-12-15 12:00:37 -0800 | [diff] [blame] | 1510 | default: |
| 1511 | childTop = paddingTop; |
| 1512 | break; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1513 | } |
| 1514 | |
Adam Powell | 696cba5 | 2011-03-29 10:38:16 -0700 | [diff] [blame] | 1515 | if (hasDividerBeforeChildAt(i)) { |
| 1516 | childLeft += mDividerWidth; |
| 1517 | } |
| 1518 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1519 | childLeft += lp.leftMargin; |
| 1520 | setChildFrame(child, childLeft + getLocationOffset(child), childTop, |
| 1521 | childWidth, childHeight); |
| 1522 | childLeft += childWidth + lp.rightMargin + |
| 1523 | getNextLocationOffset(child); |
| 1524 | |
| 1525 | i += getChildrenSkipCount(child, i); |
| 1526 | } |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | private void setChildFrame(View child, int left, int top, int width, int height) { |
| 1531 | child.layout(left, top, left + width, top + height); |
| 1532 | } |
| 1533 | |
| 1534 | /** |
| 1535 | * Should the layout be a column or a row. |
| 1536 | * @param orientation Pass HORIZONTAL or VERTICAL. Default |
| 1537 | * value is HORIZONTAL. |
| 1538 | * |
| 1539 | * @attr ref android.R.styleable#LinearLayout_orientation |
| 1540 | */ |
| 1541 | public void setOrientation(int orientation) { |
| 1542 | if (mOrientation != orientation) { |
| 1543 | mOrientation = orientation; |
| 1544 | requestLayout(); |
| 1545 | } |
| 1546 | } |
| 1547 | |
| 1548 | /** |
| 1549 | * Returns the current orientation. |
| 1550 | * |
| 1551 | * @return either {@link #HORIZONTAL} or {@link #VERTICAL} |
| 1552 | */ |
| 1553 | public int getOrientation() { |
| 1554 | return mOrientation; |
| 1555 | } |
| 1556 | |
| 1557 | /** |
| 1558 | * Describes how the child views are positioned. Defaults to GRAVITY_TOP. If |
| 1559 | * this layout has a VERTICAL orientation, this controls where all the child |
| 1560 | * views are placed if there is extra vertical space. If this layout has a |
| 1561 | * HORIZONTAL orientation, this controls the alignment of the children. |
| 1562 | * |
| 1563 | * @param gravity See {@link android.view.Gravity} |
| 1564 | * |
| 1565 | * @attr ref android.R.styleable#LinearLayout_gravity |
| 1566 | */ |
| 1567 | @android.view.RemotableViewMethod |
| 1568 | public void setGravity(int gravity) { |
| 1569 | if (mGravity != gravity) { |
| 1570 | if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == 0) { |
| 1571 | gravity |= Gravity.LEFT; |
| 1572 | } |
| 1573 | |
| 1574 | if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) { |
| 1575 | gravity |= Gravity.TOP; |
| 1576 | } |
| 1577 | |
| 1578 | mGravity = gravity; |
| 1579 | requestLayout(); |
| 1580 | } |
| 1581 | } |
| 1582 | |
| 1583 | @android.view.RemotableViewMethod |
| 1584 | public void setHorizontalGravity(int horizontalGravity) { |
| 1585 | final int gravity = horizontalGravity & Gravity.HORIZONTAL_GRAVITY_MASK; |
| 1586 | if ((mGravity & Gravity.HORIZONTAL_GRAVITY_MASK) != gravity) { |
| 1587 | mGravity = (mGravity & ~Gravity.HORIZONTAL_GRAVITY_MASK) | gravity; |
| 1588 | requestLayout(); |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | @android.view.RemotableViewMethod |
| 1593 | public void setVerticalGravity(int verticalGravity) { |
| 1594 | final int gravity = verticalGravity & Gravity.VERTICAL_GRAVITY_MASK; |
| 1595 | if ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) != gravity) { |
| 1596 | mGravity = (mGravity & ~Gravity.VERTICAL_GRAVITY_MASK) | gravity; |
| 1597 | requestLayout(); |
| 1598 | } |
| 1599 | } |
| 1600 | |
| 1601 | @Override |
| 1602 | public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| 1603 | return new LinearLayout.LayoutParams(getContext(), attrs); |
| 1604 | } |
| 1605 | |
| 1606 | /** |
| 1607 | * Returns a set of layout parameters with a width of |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1608 | * {@link android.view.ViewGroup.LayoutParams#MATCH_PARENT} |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1609 | * and a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} |
| 1610 | * when the layout's orientation is {@link #VERTICAL}. When the orientation is |
| 1611 | * {@link #HORIZONTAL}, the width is set to {@link LayoutParams#WRAP_CONTENT} |
| 1612 | * and the height to {@link LayoutParams#WRAP_CONTENT}. |
| 1613 | */ |
| 1614 | @Override |
| 1615 | protected LayoutParams generateDefaultLayoutParams() { |
| 1616 | if (mOrientation == HORIZONTAL) { |
| 1617 | return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); |
| 1618 | } else if (mOrientation == VERTICAL) { |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1619 | return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1620 | } |
| 1621 | return null; |
| 1622 | } |
| 1623 | |
| 1624 | @Override |
| 1625 | protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| 1626 | return new LayoutParams(p); |
| 1627 | } |
| 1628 | |
| 1629 | |
| 1630 | // Override to allow type-checking of LayoutParams. |
| 1631 | @Override |
| 1632 | protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| 1633 | return p instanceof LinearLayout.LayoutParams; |
| 1634 | } |
| 1635 | |
| 1636 | /** |
| 1637 | * Per-child layout information associated with ViewLinearLayout. |
| 1638 | * |
| 1639 | * @attr ref android.R.styleable#LinearLayout_Layout_layout_weight |
| 1640 | * @attr ref android.R.styleable#LinearLayout_Layout_layout_gravity |
| 1641 | */ |
| 1642 | public static class LayoutParams extends ViewGroup.MarginLayoutParams { |
| 1643 | /** |
| 1644 | * Indicates how much of the extra space in the LinearLayout will be |
| 1645 | * allocated to the view associated with these LayoutParams. Specify |
| 1646 | * 0 if the view should not be stretched. Otherwise the extra pixels |
| 1647 | * will be pro-rated among all views whose weight is greater than 0. |
| 1648 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 1649 | @ViewDebug.ExportedProperty(category = "layout") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1650 | public float weight; |
| 1651 | |
| 1652 | /** |
| 1653 | * Gravity for the view associated with these LayoutParams. |
| 1654 | * |
| 1655 | * @see android.view.Gravity |
| 1656 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 1657 | @ViewDebug.ExportedProperty(category = "layout", mapping = { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1658 | @ViewDebug.IntToString(from = -1, to = "NONE"), |
| 1659 | @ViewDebug.IntToString(from = Gravity.NO_GRAVITY, to = "NONE"), |
| 1660 | @ViewDebug.IntToString(from = Gravity.TOP, to = "TOP"), |
| 1661 | @ViewDebug.IntToString(from = Gravity.BOTTOM, to = "BOTTOM"), |
| 1662 | @ViewDebug.IntToString(from = Gravity.LEFT, to = "LEFT"), |
| 1663 | @ViewDebug.IntToString(from = Gravity.RIGHT, to = "RIGHT"), |
| 1664 | @ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL, to = "CENTER_VERTICAL"), |
| 1665 | @ViewDebug.IntToString(from = Gravity.FILL_VERTICAL, to = "FILL_VERTICAL"), |
| 1666 | @ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"), |
| 1667 | @ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL, to = "FILL_HORIZONTAL"), |
| 1668 | @ViewDebug.IntToString(from = Gravity.CENTER, to = "CENTER"), |
| 1669 | @ViewDebug.IntToString(from = Gravity.FILL, to = "FILL") |
| 1670 | }) |
| 1671 | public int gravity = -1; |
| 1672 | |
| 1673 | /** |
| 1674 | * {@inheritDoc} |
| 1675 | */ |
| 1676 | public LayoutParams(Context c, AttributeSet attrs) { |
| 1677 | super(c, attrs); |
| 1678 | TypedArray a = |
| 1679 | c.obtainStyledAttributes(attrs, com.android.internal.R.styleable.LinearLayout_Layout); |
| 1680 | |
| 1681 | weight = a.getFloat(com.android.internal.R.styleable.LinearLayout_Layout_layout_weight, 0); |
| 1682 | gravity = a.getInt(com.android.internal.R.styleable.LinearLayout_Layout_layout_gravity, -1); |
| 1683 | |
| 1684 | a.recycle(); |
| 1685 | } |
| 1686 | |
| 1687 | /** |
| 1688 | * {@inheritDoc} |
| 1689 | */ |
| 1690 | public LayoutParams(int width, int height) { |
| 1691 | super(width, height); |
| 1692 | weight = 0; |
| 1693 | } |
| 1694 | |
| 1695 | /** |
| 1696 | * Creates a new set of layout parameters with the specified width, height |
| 1697 | * and weight. |
| 1698 | * |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1699 | * @param width the width, either {@link #MATCH_PARENT}, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1700 | * {@link #WRAP_CONTENT} or a fixed size in pixels |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1701 | * @param height the height, either {@link #MATCH_PARENT}, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1702 | * {@link #WRAP_CONTENT} or a fixed size in pixels |
| 1703 | * @param weight the weight |
| 1704 | */ |
| 1705 | public LayoutParams(int width, int height, float weight) { |
| 1706 | super(width, height); |
| 1707 | this.weight = weight; |
| 1708 | } |
| 1709 | |
| 1710 | /** |
| 1711 | * {@inheritDoc} |
| 1712 | */ |
| 1713 | public LayoutParams(ViewGroup.LayoutParams p) { |
| 1714 | super(p); |
| 1715 | } |
| 1716 | |
| 1717 | /** |
| 1718 | * {@inheritDoc} |
| 1719 | */ |
| 1720 | public LayoutParams(MarginLayoutParams source) { |
| 1721 | super(source); |
| 1722 | } |
| 1723 | |
| 1724 | @Override |
| 1725 | public String debug(String output) { |
| 1726 | return output + "LinearLayout.LayoutParams={width=" + sizeToString(width) + |
| 1727 | ", height=" + sizeToString(height) + " weight=" + weight + "}"; |
| 1728 | } |
| 1729 | } |
| 1730 | } |