1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.internal.view.menu; 17 18 import android.content.Context; 19 import android.content.res.Configuration; 20 import android.content.res.TypedArray; 21 import android.util.AttributeSet; 22 import android.view.Gravity; 23 import android.view.View; 24 import android.view.ViewDebug; 25 import android.view.ViewGroup; 26 import android.view.accessibility.AccessibilityEvent; 27 import android.widget.LinearLayout; 28 29 import com.android.internal.R; 30 31 /** 32 * @hide 33 */ 34 public class ActionMenuView extends LinearLayout implements MenuBuilder.ItemInvoker, MenuView { 35 private static final String TAG = "ActionMenuView"; 36 37 static final int MIN_CELL_SIZE = 56; // dips 38 static final int GENERATED_ITEM_PADDING = 4; // dips 39 40 private MenuBuilder mMenu; 41 42 private boolean mReserveOverflow; 43 private ActionMenuPresenter mPresenter; 44 private boolean mFormatItems; 45 private int mFormatItemsWidth; 46 private int mMinCellSize; 47 private int mGeneratedItemPadding; 48 private int mMeasuredExtraWidth; 49 private int mMaxItemHeight; 50 51 public ActionMenuView(Context context) { 52 this(context, null); 53 } 54 55 public ActionMenuView(Context context, AttributeSet attrs) { 56 super(context, attrs); 57 setBaselineAligned(false); 58 final float density = context.getResources().getDisplayMetrics().density; 59 mMinCellSize = (int) (MIN_CELL_SIZE * density); 60 mGeneratedItemPadding = (int) (GENERATED_ITEM_PADDING * density); 61 62 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ActionBar, 63 R.attr.actionBarStyle, 0); 64 mMaxItemHeight = a.getDimensionPixelSize(R.styleable.ActionBar_height, 0); 65 a.recycle(); 66 } 67 68 public void setPresenter(ActionMenuPresenter presenter) { 69 mPresenter = presenter; 70 } 71 72 public boolean isExpandedFormat() { 73 return mFormatItems; 74 } 75 76 @Override 77 public void onConfigurationChanged(Configuration newConfig) { 78 super.onConfigurationChanged(newConfig); 79 mPresenter.updateMenuView(false); 80 81 if (mPresenter != null && mPresenter.isOverflowMenuShowing()) { 82 mPresenter.hideOverflowMenu(); 83 mPresenter.showOverflowMenu(); 84 } 85 } 86 87 @Override 88 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 89 // If we've been given an exact size to match, apply special formatting during layout. 90 final boolean wasFormatted = mFormatItems; 91 mFormatItems = MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY; 92 93 if (wasFormatted != mFormatItems) { 94 mFormatItemsWidth = 0; // Reset this when switching modes 95 } 96 97 // Special formatting can change whether items can fit as action buttons. 98 // Kick the menu and update presenters when this changes. 99 final int widthSize = MeasureSpec.getMode(widthMeasureSpec); 100 if (mFormatItems && mMenu != null && widthSize != mFormatItemsWidth) { 101 mFormatItemsWidth = widthSize; 102 mMenu.onItemsChanged(true); 103 } 104 105 if (mFormatItems) { 106 onMeasureExactFormat(widthMeasureSpec, heightMeasureSpec); 107 } else { 108 // Previous measurement at exact format may have set margins - reset them. 109 final int childCount = getChildCount(); 110 for (int i = 0; i < childCount; i++) { 111 final View child = getChildAt(i); 112 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 113 lp.leftMargin = lp.rightMargin = 0; 114 } 115 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 116 } 117 } 118 119 private void onMeasureExactFormat(int widthMeasureSpec, int heightMeasureSpec) { 120 // We already know the width mode is EXACTLY if we're here. 121 final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 122 int widthSize = MeasureSpec.getSize(widthMeasureSpec); 123 int heightSize = MeasureSpec.getSize(heightMeasureSpec); 124 125 final int widthPadding = getPaddingLeft() + getPaddingRight(); 126 final int heightPadding = getPaddingTop() + getPaddingBottom(); 127 128 final int itemHeightSpec = heightMode == MeasureSpec.EXACTLY 129 ? MeasureSpec.makeMeasureSpec(heightSize - heightPadding, MeasureSpec.EXACTLY) 130 : MeasureSpec.makeMeasureSpec( 131 Math.min(mMaxItemHeight, heightSize - heightPadding), MeasureSpec.AT_MOST); 132 133 widthSize -= widthPadding; 134 135 // Divide the view into cells. 136 final int cellCount = widthSize / mMinCellSize; 137 final int cellSizeRemaining = widthSize % mMinCellSize; 138 139 if (cellCount == 0) { 140 // Give up, nothing fits. 141 setMeasuredDimension(widthSize, 0); 142 return; 143 } 144 145 final int cellSize = mMinCellSize + cellSizeRemaining / cellCount; 146 147 int cellsRemaining = cellCount; 148 int maxChildHeight = 0; 149 int maxCellsUsed = 0; 150 int expandableItemCount = 0; 151 int visibleItemCount = 0; 152 boolean hasOverflow = false; 153 154 // This is used as a bitfield to locate the smallest items present. Assumes childCount < 64. 155 long smallestItemsAt = 0; 156 157 final int childCount = getChildCount(); 158 for (int i = 0; i < childCount; i++) { 159 final View child = getChildAt(i); 160 if (child.getVisibility() == GONE) continue; 161 162 final boolean isGeneratedItem = child instanceof ActionMenuItemView; 163 visibleItemCount++; 164 165 if (isGeneratedItem) { 166 // Reset padding for generated menu item views; it may change below 167 // and views are recycled. 168 child.setPadding(mGeneratedItemPadding, 0, mGeneratedItemPadding, 0); 169 } 170 171 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 172 lp.expanded = false; 173 lp.extraPixels = 0; 174 lp.cellsUsed = 0; 175 lp.expandable = false; 176 lp.leftMargin = 0; 177 lp.rightMargin = 0; 178 lp.preventEdgeOffset = isGeneratedItem && ((ActionMenuItemView) child).hasText(); 179 180 // Overflow always gets 1 cell. No more, no less. 181 final int cellsAvailable = lp.isOverflowButton ? 1 : cellsRemaining; 182 183 final int cellsUsed = measureChildForCells(child, cellSize, cellsAvailable, 184 itemHeightSpec, heightPadding); 185 186 maxCellsUsed = Math.max(maxCellsUsed, cellsUsed); 187 if (lp.expandable) expandableItemCount++; 188 if (lp.isOverflowButton) hasOverflow = true; 189 190 cellsRemaining -= cellsUsed; 191 maxChildHeight = Math.max(maxChildHeight, child.getMeasuredHeight()); 192 if (cellsUsed == 1) smallestItemsAt |= (1 << i); 193 } 194 195 // When we have overflow and a single expanded (text) item, we want to try centering it 196 // visually in the available space even though overflow consumes some of it. 197 final boolean centerSingleExpandedItem = hasOverflow && visibleItemCount == 2; 198 199 // Divide space for remaining cells if we have items that can expand. 200 // Try distributing whole leftover cells to smaller items first. 201 202 boolean needsExpansion = false; 203 while (expandableItemCount > 0 && cellsRemaining > 0) { 204 int minCells = Integer.MAX_VALUE; 205 long minCellsAt = 0; // Bit locations are indices of relevant child views 206 int minCellsItemCount = 0; 207 for (int i = 0; i < childCount; i++) { 208 final View child = getChildAt(i); 209 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 210 211 // Don't try to expand items that shouldn't. 212 if (!lp.expandable) continue; 213 214 // Mark indices of children that can receive an extra cell. 215 if (lp.cellsUsed < minCells) { 216 minCells = lp.cellsUsed; 217 minCellsAt = 1 << i; 218 minCellsItemCount = 1; 219 } else if (lp.cellsUsed == minCells) { 220 minCellsAt |= 1 << i; 221 minCellsItemCount++; 222 } 223 } 224 225 // Items that get expanded will always be in the set of smallest items when we're done. 226 smallestItemsAt |= minCellsAt; 227 228 if (minCellsItemCount > cellsRemaining) break; // Couldn't expand anything evenly. Stop. 229 230 // We have enough cells, all minimum size items will be incremented. 231 minCells++; 232 233 for (int i = 0; i < childCount; i++) { 234 final View child = getChildAt(i); 235 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 236 if ((minCellsAt & (1 << i)) == 0) { 237 // If this item is already at our small item count, mark it for later. 238 if (lp.cellsUsed == minCells) smallestItemsAt |= 1 << i; 239 continue; 240 } 241 242 if (centerSingleExpandedItem && lp.preventEdgeOffset && cellsRemaining == 1) { 243 // Add padding to this item such that it centers. 244 child.setPadding(mGeneratedItemPadding + cellSize, 0, mGeneratedItemPadding, 0); 245 } 246 lp.cellsUsed++; 247 lp.expanded = true; 248 cellsRemaining--; 249 } 250 251 needsExpansion = true; 252 } 253 254 // Divide any space left that wouldn't divide along cell boundaries 255 // evenly among the smallest items 256 257 final boolean singleItem = !hasOverflow && visibleItemCount == 1; 258 if (cellsRemaining > 0 && smallestItemsAt != 0 && 259 (cellsRemaining < visibleItemCount - 1 || singleItem || maxCellsUsed > 1)) { 260 float expandCount = Long.bitCount(smallestItemsAt); 261 262 if (!singleItem) { 263 // The items at the far edges may only expand by half in order to pin to either side. 264 if ((smallestItemsAt & 1) != 0) { 265 LayoutParams lp = (LayoutParams) getChildAt(0).getLayoutParams(); 266 if (!lp.preventEdgeOffset) expandCount -= 0.5f; 267 } 268 if ((smallestItemsAt & (1 << (childCount - 1))) != 0) { 269 LayoutParams lp = ((LayoutParams) getChildAt(childCount - 1).getLayoutParams()); 270 if (!lp.preventEdgeOffset) expandCount -= 0.5f; 271 } 272 } 273 274 final int extraPixels = expandCount > 0 ? 275 (int) (cellsRemaining * cellSize / expandCount) : 0; 276 277 for (int i = 0; i < childCount; i++) { 278 if ((smallestItemsAt & (1 << i)) == 0) continue; 279 280 final View child = getChildAt(i); 281 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 282 if (child instanceof ActionMenuItemView) { 283 // If this is one of our views, expand and measure at the larger size. 284 lp.extraPixels = extraPixels; 285 lp.expanded = true; 286 if (i == 0 && !lp.preventEdgeOffset) { 287 // First item gets part of its new padding pushed out of sight. 288 // The last item will get this implicitly from layout. 289 lp.leftMargin = -extraPixels / 2; 290 } 291 needsExpansion = true; 292 } else if (lp.isOverflowButton) { 293 lp.extraPixels = extraPixels; 294 lp.expanded = true; 295 lp.rightMargin = -extraPixels / 2; 296 needsExpansion = true; 297 } else { 298 // If we don't know what it is, give it some margins instead 299 // and let it center within its space. We still want to pin 300 // against the edges. 301 if (i != 0) { 302 lp.leftMargin = extraPixels / 2; 303 } 304 if (i != childCount - 1) { 305 lp.rightMargin = extraPixels / 2; 306 } 307 } 308 } 309 310 cellsRemaining = 0; 311 } 312 313 // Remeasure any items that have had extra space allocated to them. 314 if (needsExpansion) { 315 for (int i = 0; i < childCount; i++) { 316 final View child = getChildAt(i); 317 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 318 319 if (!lp.expanded) continue; 320 321 final int width = lp.cellsUsed * cellSize + lp.extraPixels; 322 child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY), 323 itemHeightSpec); 324 } 325 } 326 327 if (heightMode != MeasureSpec.EXACTLY) { 328 heightSize = maxChildHeight; 329 } 330 331 setMeasuredDimension(widthSize, heightSize); 332 mMeasuredExtraWidth = cellsRemaining * cellSize; 333 } 334 335 /** 336 * Measure a child view to fit within cell-based formatting. The child's width 337 * will be measured to a whole multiple of cellSize. 338 * 339 * <p>Sets the expandable and cellsUsed fields of LayoutParams. 340 * 341 * @param child Child to measure 342 * @param cellSize Size of one cell 343 * @param cellsRemaining Number of cells remaining that this view can expand to fill 344 * @param parentHeightMeasureSpec MeasureSpec used by the parent view 345 * @param parentHeightPadding Padding present in the parent view 346 * @return Number of cells this child was measured to occupy 347 */ 348 static int measureChildForCells(View child, int cellSize, int cellsRemaining, 349 int parentHeightMeasureSpec, int parentHeightPadding) { 350 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 351 352 final int childHeightSize = MeasureSpec.getSize(parentHeightMeasureSpec) - 353 parentHeightPadding; 354 final int childHeightMode = MeasureSpec.getMode(parentHeightMeasureSpec); 355 final int childHeightSpec = MeasureSpec.makeMeasureSpec(childHeightSize, childHeightMode); 356 357 final ActionMenuItemView itemView = child instanceof ActionMenuItemView ? 358 (ActionMenuItemView) child : null; 359 final boolean hasText = itemView != null && itemView.hasText(); 360 361 int cellsUsed = 0; 362 if (cellsRemaining > 0 && (!hasText || cellsRemaining >= 2)) { 363 final int childWidthSpec = MeasureSpec.makeMeasureSpec( 364 cellSize * cellsRemaining, MeasureSpec.AT_MOST); 365 child.measure(childWidthSpec, childHeightSpec); 366 367 final int measuredWidth = child.getMeasuredWidth(); 368 cellsUsed = measuredWidth / cellSize; 369 if (measuredWidth % cellSize != 0) cellsUsed++; 370 if (hasText && cellsUsed < 2) cellsUsed = 2; 371 } 372 373 final boolean expandable = !lp.isOverflowButton && hasText; 374 lp.expandable = expandable; 375 376 lp.cellsUsed = cellsUsed; 377 final int targetWidth = cellsUsed * cellSize; 378 child.measure(MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY), 379 childHeightSpec); 380 return cellsUsed; 381 } 382 383 @Override 384 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 385 if (!mFormatItems) { 386 super.onLayout(changed, left, top, right, bottom); 387 return; 388 } 389 390 final int childCount = getChildCount(); 391 final int midVertical = (top + bottom) / 2; 392 final int dividerWidth = getDividerWidth(); 393 int overflowWidth = 0; 394 int nonOverflowWidth = 0; 395 int nonOverflowCount = 0; 396 int widthRemaining = right - left - getPaddingRight() - getPaddingLeft(); 397 boolean hasOverflow = false; 398 for (int i = 0; i < childCount; i++) { 399 final View v = getChildAt(i); 400 if (v.getVisibility() == GONE) { 401 continue; 402 } 403 404 LayoutParams p = (LayoutParams) v.getLayoutParams(); 405 if (p.isOverflowButton) { 406 overflowWidth = v.getMeasuredWidth(); 407 if (hasDividerBeforeChildAt(i)) { 408 overflowWidth += dividerWidth; 409 } 410 411 int height = v.getMeasuredHeight(); 412 int r = getWidth() - getPaddingRight() - p.rightMargin; 413 int l = r - overflowWidth; 414 int t = midVertical - (height / 2); 415 int b = t + height; 416 v.layout(l, t, r, b); 417 418 widthRemaining -= overflowWidth; 419 hasOverflow = true; 420 } else { 421 final int size = v.getMeasuredWidth() + p.leftMargin + p.rightMargin; 422 nonOverflowWidth += size; 423 widthRemaining -= size; 424 if (hasDividerBeforeChildAt(i)) { 425 nonOverflowWidth += dividerWidth; 426 } 427 nonOverflowCount++; 428 } 429 } 430 431 if (childCount == 1 && !hasOverflow) { 432 // Center a single child 433 final View v = getChildAt(0); 434 final int width = v.getMeasuredWidth(); 435 final int height = v.getMeasuredHeight(); 436 final int midHorizontal = (right - left) / 2; 437 final int l = midHorizontal - width / 2; 438 final int t = midVertical - height / 2; 439 v.layout(l, t, l + width, t + height); 440 return; 441 } 442 443 final int spacerCount = nonOverflowCount - (hasOverflow ? 0 : 1); 444 final int spacerSize = Math.max(0, spacerCount > 0 ? widthRemaining / spacerCount : 0); 445 446 int startLeft = getPaddingLeft(); 447 for (int i = 0; i < childCount; i++) { 448 final View v = getChildAt(i); 449 final LayoutParams lp = (LayoutParams) v.getLayoutParams(); 450 if (v.getVisibility() == GONE || lp.isOverflowButton) { 451 continue; 452 } 453 454 startLeft += lp.leftMargin; 455 int width = v.getMeasuredWidth(); 456 int height = v.getMeasuredHeight(); 457 int t = midVertical - height / 2; 458 v.layout(startLeft, t, startLeft + width, t + height); 459 startLeft += width + lp.rightMargin + spacerSize; 460 } 461 } 462 463 @Override 464 public void onDetachedFromWindow() { 465 super.onDetachedFromWindow(); 466 mPresenter.dismissPopupMenus(); 467 } 468 469 public boolean isOverflowReserved() { 470 return mReserveOverflow; 471 } 472 473 public void setOverflowReserved(boolean reserveOverflow) { 474 mReserveOverflow = reserveOverflow; 475 } 476 477 @Override 478 protected LayoutParams generateDefaultLayoutParams() { 479 LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, 480 LayoutParams.WRAP_CONTENT); 481 params.gravity = Gravity.CENTER_VERTICAL; 482 return params; 483 } 484 485 @Override 486 public LayoutParams generateLayoutParams(AttributeSet attrs) { 487 return new LayoutParams(getContext(), attrs); 488 } 489 490 @Override 491 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 492 if (p instanceof LayoutParams) { 493 LayoutParams result = new LayoutParams((LayoutParams) p); 494 if (result.gravity <= Gravity.NO_GRAVITY) { 495 result.gravity = Gravity.CENTER_VERTICAL; 496 } 497 return result; 498 } 499 return generateDefaultLayoutParams(); 500 } 501 502 @Override 503 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 504 return p != null && p instanceof LayoutParams; 505 } 506 507 public LayoutParams generateOverflowButtonLayoutParams() { 508 LayoutParams result = generateDefaultLayoutParams(); 509 result.isOverflowButton = true; 510 return result; 511 } 512 513 public boolean invokeItem(MenuItemImpl item) { 514 return mMenu.performItemAction(item, 0); 515 } 516 517 public int getWindowAnimations() { 518 return 0; 519 } 520 521 public void initialize(MenuBuilder menu) { 522 mMenu = menu; 523 } 524 525 @Override 526 protected boolean hasDividerBeforeChildAt(int childIndex) { 527 final View childBefore = getChildAt(childIndex - 1); 528 final View child = getChildAt(childIndex); 529 boolean result = false; 530 if (childIndex < getChildCount() && childBefore instanceof ActionMenuChildView) { 531 result |= ((ActionMenuChildView) childBefore).needsDividerAfter(); 532 } 533 if (childIndex > 0 && child instanceof ActionMenuChildView) { 534 result |= ((ActionMenuChildView) child).needsDividerBefore(); 535 } 536 return result; 537 } 538 539 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 540 return false; 541 } 542 543 public interface ActionMenuChildView { 544 public boolean needsDividerBefore(); 545 public boolean needsDividerAfter(); 546 } 547 548 public static class LayoutParams extends LinearLayout.LayoutParams { 549 @ViewDebug.ExportedProperty(category = "layout") 550 public boolean isOverflowButton; 551 @ViewDebug.ExportedProperty(category = "layout") 552 public int cellsUsed; 553 @ViewDebug.ExportedProperty(category = "layout") 554 public int extraPixels; 555 @ViewDebug.ExportedProperty(category = "layout") 556 public boolean expandable; 557 @ViewDebug.ExportedProperty(category = "layout") 558 public boolean preventEdgeOffset; 559 560 public boolean expanded; 561 562 public LayoutParams(Context c, AttributeSet attrs) { 563 super(c, attrs); 564 } 565 566 public LayoutParams(LayoutParams other) { 567 super((LinearLayout.LayoutParams) other); 568 isOverflowButton = other.isOverflowButton; 569 } 570 571 public LayoutParams(int width, int height) { 572 super(width, height); 573 isOverflowButton = false; 574 } 575 576 public LayoutParams(int width, int height, boolean isOverflowButton) { 577 super(width, height); 578 this.isOverflowButton = isOverflowButton; 579 } 580 } 581 } 582
