PageAdapter.java revision 7fd5ada98aa9e035682531d9fe25633fdd24a058
1/* 2 * Copyright (C) 2014 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 17package com.android.printspooler.ui; 18 19import android.content.Context; 20import android.graphics.Bitmap; 21import android.graphics.Canvas; 22import android.graphics.drawable.BitmapDrawable; 23import android.os.ParcelFileDescriptor; 24import android.print.PageRange; 25import android.print.PrintAttributes.MediaSize; 26import android.print.PrintAttributes.Margins; 27import android.print.PrintDocumentInfo; 28import android.support.v7.widget.RecyclerView.Adapter; 29import android.support.v7.widget.RecyclerView.ViewHolder; 30import android.util.Log; 31import android.util.SparseArray; 32import android.view.LayoutInflater; 33import android.view.View; 34import android.view.View.OnClickListener; 35import android.view.ViewGroup; 36import android.view.ViewGroup.LayoutParams; 37import android.view.View.MeasureSpec; 38import android.widget.TextView; 39import com.android.printspooler.R; 40import com.android.printspooler.model.PageContentRepository; 41import com.android.printspooler.model.PageContentRepository.PageContentProvider; 42import com.android.printspooler.util.PageRangeUtils; 43import com.android.printspooler.widget.PageContentView; 44import com.android.printspooler.widget.PreviewPageFrame; 45import dalvik.system.CloseGuard; 46 47import java.util.ArrayList; 48import java.util.Arrays; 49import java.util.List; 50 51/** 52 * This class represents the adapter for the pages in the print preview list. 53 */ 54public final class PageAdapter extends Adapter implements 55 PageContentRepository.OnMalformedPdfFileListener { 56 private static final String LOG_TAG = "PageAdapter"; 57 58 private static final int MAX_PREVIEW_PAGES_BATCH = 50; 59 60 private static final boolean DEBUG = false; 61 62 private static final PageRange[] ALL_PAGES_ARRAY = new PageRange[] { 63 PageRange.ALL_PAGES 64 }; 65 66 private static final int INVALID_PAGE_INDEX = -1; 67 68 private static final int STATE_CLOSED = 0; 69 private static final int STATE_OPENED = 1; 70 private static final int STATE_DESTROYED = 2; 71 72 private final CloseGuard mCloseGuard = CloseGuard.get(); 73 74 private final SparseArray<Void> mBoundPagesInAdapter = new SparseArray<>(); 75 private final SparseArray<Void> mConfirmedPagesInDocument = new SparseArray<>(); 76 77 private final PageClickListener mPageClickListener = new PageClickListener(); 78 79 private final Context mContext; 80 private final LayoutInflater mLayoutInflater; 81 82 private final ContentCallbacks mCallbacks; 83 private final PageContentRepository mPageContentRepository; 84 private final PreviewArea mPreviewArea; 85 86 // Which document pages to be written. 87 private PageRange[] mRequestedPages; 88 // Pages written in the current file. 89 private PageRange[] mWrittenPages; 90 // Pages the user selected in the UI. 91 private PageRange[] mSelectedPages; 92 93 private BitmapDrawable mEmptyState; 94 95 private int mDocumentPageCount = PrintDocumentInfo.PAGE_COUNT_UNKNOWN; 96 private int mSelectedPageCount; 97 98 private int mPreviewPageMargin; 99 private int mPreviewPageMinWidth; 100 private int mPreviewListPadding; 101 private int mFooterHeight; 102 103 private int mColumnCount; 104 105 private MediaSize mMediaSize; 106 private Margins mMinMargins; 107 108 private int mState; 109 110 private int mPageContentWidth; 111 private int mPageContentHeight; 112 113 public interface ContentCallbacks { 114 public void onRequestContentUpdate(); 115 public void onMalformedPdfFile(); 116 } 117 118 public interface PreviewArea { 119 public int getWidth(); 120 public int getHeight(); 121 public void setColumnCount(int columnCount); 122 public void setPadding(int left, int top, int right, int bottom); 123 } 124 125 public PageAdapter(Context context, ContentCallbacks callbacks, PreviewArea previewArea) { 126 mContext = context; 127 mCallbacks = callbacks; 128 mLayoutInflater = (LayoutInflater) context.getSystemService( 129 Context.LAYOUT_INFLATER_SERVICE); 130 mPageContentRepository = new PageContentRepository(context, this); 131 132 mPreviewPageMargin = mContext.getResources().getDimensionPixelSize( 133 R.dimen.preview_page_margin); 134 135 mPreviewPageMinWidth = mContext.getResources().getDimensionPixelSize( 136 R.dimen.preview_page_min_width); 137 138 mPreviewListPadding = mContext.getResources().getDimensionPixelSize( 139 R.dimen.preview_list_padding); 140 141 mColumnCount = mContext.getResources().getInteger( 142 R.integer.preview_page_per_row_count); 143 144 mFooterHeight = mContext.getResources().getDimensionPixelSize( 145 R.dimen.preview_page_footer_height); 146 147 mPreviewArea = previewArea; 148 149 mCloseGuard.open("destroy"); 150 151 setHasStableIds(true); 152 153 mState = STATE_CLOSED; 154 if (DEBUG) { 155 Log.i(LOG_TAG, "STATE_CLOSED"); 156 } 157 } 158 159 @Override 160 public void onMalformedPdfFile() { 161 mCallbacks.onMalformedPdfFile(); 162 } 163 164 public void onOrientationChanged() { 165 mColumnCount = mContext.getResources().getInteger( 166 R.integer.preview_page_per_row_count); 167 notifyDataSetChanged(); 168 } 169 170 public boolean isOpened() { 171 return mState == STATE_OPENED; 172 } 173 174 public int getFilePageCount() { 175 return mPageContentRepository.getFilePageCount(); 176 } 177 178 public void open(ParcelFileDescriptor source, final Runnable callback) { 179 throwIfNotClosed(); 180 mState = STATE_OPENED; 181 if (DEBUG) { 182 Log.i(LOG_TAG, "STATE_OPENED"); 183 } 184 mPageContentRepository.open(source, new Runnable() { 185 @Override 186 public void run() { 187 notifyDataSetChanged(); 188 callback.run(); 189 } 190 }); 191 } 192 193 public void update(PageRange[] writtenPages, PageRange[] selectedPages, 194 int documentPageCount, MediaSize mediaSize, Margins minMargins) { 195 boolean documentChanged = false; 196 boolean updatePreviewAreaAndPageSize = false; 197 198 // If the app does not tell how many pages are in the document we cannot 199 // optimize and ask for all pages whose count we get from the renderer. 200 if (documentPageCount == PrintDocumentInfo.PAGE_COUNT_UNKNOWN) { 201 if (writtenPages == null) { 202 // If we already requested all pages, just wait. 203 if (!Arrays.equals(ALL_PAGES_ARRAY, mRequestedPages)) { 204 mRequestedPages = ALL_PAGES_ARRAY; 205 mCallbacks.onRequestContentUpdate(); 206 } 207 return; 208 } else { 209 documentPageCount = mPageContentRepository.getFilePageCount(); 210 if (documentPageCount <= 0) { 211 return; 212 } 213 } 214 } 215 216 if (!Arrays.equals(mSelectedPages, selectedPages)) { 217 mSelectedPages = selectedPages; 218 mSelectedPageCount = PageRangeUtils.getNormalizedPageCount( 219 mSelectedPages, documentPageCount); 220 setConfirmedPages(mSelectedPages, documentPageCount); 221 updatePreviewAreaAndPageSize = true; 222 documentChanged = true; 223 } 224 225 if (mDocumentPageCount != documentPageCount) { 226 mDocumentPageCount = documentPageCount; 227 documentChanged = true; 228 } 229 230 if (mMediaSize == null || !mMediaSize.equals(mediaSize)) { 231 mMediaSize = mediaSize; 232 updatePreviewAreaAndPageSize = true; 233 documentChanged = true; 234 } 235 236 if (mMinMargins == null || !mMinMargins.equals(minMargins)) { 237 mMinMargins = minMargins; 238 updatePreviewAreaAndPageSize = true; 239 documentChanged = true; 240 } 241 242 // If *all pages* is selected we need to convert that to absolute 243 // range as we will be checking if some pages are written or not. 244 if (writtenPages != null) { 245 // If we get all pages, this means all pages that we requested. 246 if (PageRangeUtils.isAllPages(writtenPages)) { 247 writtenPages = mRequestedPages; 248 } 249 if (!Arrays.equals(mWrittenPages, writtenPages)) { 250 // TODO: Do a surgical invalidation of only written pages changed. 251 mWrittenPages = writtenPages; 252 documentChanged = true; 253 } 254 } 255 256 if (updatePreviewAreaAndPageSize) { 257 updatePreviewAreaPageSizeAndEmptyState(); 258 } 259 260 if (documentChanged) { 261 notifyDataSetChanged(); 262 } 263 } 264 265 public void close(Runnable callback) { 266 throwIfNotOpened(); 267 mState = STATE_CLOSED; 268 if (DEBUG) { 269 Log.i(LOG_TAG, "STATE_CLOSED"); 270 } 271 mPageContentRepository.close(callback); 272 } 273 274 @Override 275 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 276 View page = mLayoutInflater.inflate(R.layout.preview_page, parent, false); 277 ViewHolder holder = new MyViewHolder(page); 278 return holder; 279 } 280 281 @Override 282 public void onBindViewHolder(ViewHolder holder, int position) { 283 if (DEBUG) { 284 Log.i(LOG_TAG, "Binding holder: " + holder + " with id: " + getItemId(position) 285 + " for position: " + position); 286 } 287 288 MyViewHolder myHolder = (MyViewHolder) holder; 289 290 PreviewPageFrame page = (PreviewPageFrame) holder.itemView; 291 page.setOnClickListener(mPageClickListener); 292 293 page.setTag(holder); 294 295 myHolder.mPageInAdapter = position; 296 297 final int pageInDocument = computePageIndexInDocument(position); 298 final int pageIndexInFile = computePageIndexInFile(pageInDocument); 299 300 PageContentView content = (PageContentView) page.findViewById(R.id.page_content); 301 302 LayoutParams params = content.getLayoutParams(); 303 params.width = mPageContentWidth; 304 params.height = mPageContentHeight; 305 306 PageContentProvider provider = content.getPageContentProvider(); 307 308 if (pageIndexInFile != INVALID_PAGE_INDEX) { 309 if (DEBUG) { 310 Log.i(LOG_TAG, "Binding provider:" 311 + " pageIndexInAdapter: " + position 312 + ", pageInDocument: " + pageInDocument 313 + ", pageIndexInFile: " + pageIndexInFile); 314 } 315 316 // OK, there are bugs in recycler view which tries to bind views 317 // without recycling them which would give us a chance to clean up. 318 PageContentProvider boundProvider = mPageContentRepository 319 .peekPageContentProvider(pageIndexInFile); 320 if (boundProvider != null) { 321 PageContentView owner = (PageContentView) boundProvider.getOwner(); 322 owner.init(null, mEmptyState, mMediaSize, mMinMargins); 323 mPageContentRepository.releasePageContentProvider(boundProvider); 324 } 325 326 provider = mPageContentRepository.acquirePageContentProvider( 327 pageIndexInFile, content); 328 mBoundPagesInAdapter.put(position, null); 329 } else { 330 onSelectedPageNotInFile(pageInDocument); 331 } 332 content.init(provider, mEmptyState, mMediaSize, mMinMargins); 333 334 if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) >= 0) { 335 page.setSelected(true, false); 336 } else { 337 page.setSelected(false, false); 338 } 339 340 page.setContentDescription(mContext.getString(R.string.page_description_template, 341 pageInDocument + 1, mDocumentPageCount)); 342 343 TextView pageNumberView = (TextView) page.findViewById(R.id.page_number); 344 String text = mContext.getString(R.string.current_page_template, 345 pageInDocument + 1, mDocumentPageCount); 346 pageNumberView.setText(text); 347 } 348 349 @Override 350 public int getItemCount() { 351 return mSelectedPageCount; 352 } 353 354 @Override 355 public long getItemId(int position) { 356 return computePageIndexInDocument(position); 357 } 358 359 @Override 360 public void onViewRecycled(ViewHolder holder) { 361 MyViewHolder myHolder = (MyViewHolder) holder; 362 PageContentView content = (PageContentView) holder.itemView 363 .findViewById(R.id.page_content); 364 recyclePageView(content, myHolder.mPageInAdapter); 365 myHolder.mPageInAdapter = INVALID_PAGE_INDEX; 366 } 367 368 public PageRange[] getRequestedPages() { 369 return mRequestedPages; 370 } 371 372 public PageRange[] getSelectedPages() { 373 PageRange[] selectedPages = computeSelectedPages(); 374 if (!Arrays.equals(mSelectedPages, selectedPages)) { 375 mSelectedPages = selectedPages; 376 mSelectedPageCount = PageRangeUtils.getNormalizedPageCount( 377 mSelectedPages, mDocumentPageCount); 378 updatePreviewAreaPageSizeAndEmptyState(); 379 notifyDataSetChanged(); 380 } 381 return mSelectedPages; 382 } 383 384 public void onPreviewAreaSizeChanged() { 385 if (mMediaSize != null) { 386 updatePreviewAreaPageSizeAndEmptyState(); 387 notifyDataSetChanged(); 388 } 389 } 390 391 private void updatePreviewAreaPageSizeAndEmptyState() { 392 if (mMediaSize == null) { 393 return; 394 } 395 396 final int availableWidth = mPreviewArea.getWidth(); 397 final int availableHeight = mPreviewArea.getHeight(); 398 399 // Page aspect ratio to keep. 400 final float pageAspectRatio = (float) mMediaSize.getWidthMils() 401 / mMediaSize.getHeightMils(); 402 403 // Make sure we have no empty columns. 404 final int columnCount = Math.min(mSelectedPageCount, mColumnCount); 405 mPreviewArea.setColumnCount(columnCount); 406 407 // Compute max page width. 408 final int horizontalMargins = 2 * columnCount * mPreviewPageMargin; 409 final int horizontalPaddingAndMargins = horizontalMargins + 2 * mPreviewListPadding; 410 final int pageContentDesiredWidth = (int) ((((float) availableWidth 411 - horizontalPaddingAndMargins) / columnCount) + 0.5f); 412 413 // Compute max page height. 414 final int pageContentDesiredHeight = (int) (((float) pageContentDesiredWidth 415 / pageAspectRatio) + 0.5f); 416 417 // If the page does not fit entirely in a vertical direction, 418 // we shirk it but not less than the minimal page width. 419 final int pageContentMinHeight = (int) (mPreviewPageMinWidth / pageAspectRatio + 0.5f); 420 final int pageContentMaxHeight = Math.max(pageContentMinHeight, 421 availableHeight - 2 * (mPreviewListPadding + mPreviewPageMargin) - mFooterHeight); 422 423 mPageContentHeight = Math.min(pageContentDesiredHeight, pageContentMaxHeight); 424 mPageContentWidth = (int) ((mPageContentHeight * pageAspectRatio) + 0.5f); 425 426 final int totalContentWidth = columnCount * mPageContentWidth + horizontalMargins; 427 final int horizontalPadding = (availableWidth - totalContentWidth) / 2; 428 429 final int rowCount = mSelectedPageCount / columnCount 430 + ((mSelectedPageCount % columnCount) > 0 ? 1 : 0); 431 final int totalContentHeight = rowCount * (mPageContentHeight + mFooterHeight + 2 432 * mPreviewPageMargin); 433 434 final int verticalPadding; 435 if (mPageContentHeight + mFooterHeight + mPreviewListPadding 436 + 2 * mPreviewPageMargin > availableHeight) { 437 verticalPadding = Math.max(0, 438 (availableHeight - mPageContentHeight - mFooterHeight) / 2 439 - mPreviewPageMargin); 440 } else { 441 verticalPadding = Math.max(mPreviewListPadding, 442 (availableHeight - totalContentHeight) / 2); 443 } 444 445 mPreviewArea.setPadding(horizontalPadding, verticalPadding, 446 horizontalPadding, verticalPadding); 447 448 // Now update the empty state drawable, as it depends on the page 449 // size and is reused for all views for better performance. 450 LayoutInflater inflater = LayoutInflater.from(mContext); 451 View content = inflater.inflate(R.layout.preview_page_loading, null, false); 452 content.measure(MeasureSpec.makeMeasureSpec(mPageContentWidth, MeasureSpec.EXACTLY), 453 MeasureSpec.makeMeasureSpec(mPageContentHeight, MeasureSpec.EXACTLY)); 454 content.layout(0, 0, content.getMeasuredWidth(), content.getMeasuredHeight()); 455 456 Bitmap bitmap = Bitmap.createBitmap(mPageContentWidth, mPageContentHeight, 457 Bitmap.Config.ARGB_8888); 458 Canvas canvas = new Canvas(bitmap); 459 content.draw(canvas); 460 461 // Do not recycle the old bitmap if such as it may be set as an empty 462 // state to any of the page views. Just let the GC take care of it. 463 mEmptyState = new BitmapDrawable(mContext.getResources(), bitmap); 464 } 465 466 private PageRange[] computeSelectedPages() { 467 ArrayList<PageRange> selectedPagesList = new ArrayList<>(); 468 469 int startPageIndex = INVALID_PAGE_INDEX; 470 int endPageIndex = INVALID_PAGE_INDEX; 471 472 final int pageCount = mConfirmedPagesInDocument.size(); 473 for (int i = 0; i < pageCount; i++) { 474 final int pageIndex = mConfirmedPagesInDocument.keyAt(i); 475 if (startPageIndex == INVALID_PAGE_INDEX) { 476 startPageIndex = endPageIndex = pageIndex; 477 } 478 if (endPageIndex + 1 < pageIndex) { 479 PageRange pageRange = new PageRange(startPageIndex, endPageIndex); 480 selectedPagesList.add(pageRange); 481 startPageIndex = pageIndex; 482 } 483 endPageIndex = pageIndex; 484 } 485 486 if (startPageIndex != INVALID_PAGE_INDEX 487 && endPageIndex != INVALID_PAGE_INDEX) { 488 PageRange pageRange = new PageRange(startPageIndex, endPageIndex); 489 selectedPagesList.add(pageRange); 490 } 491 492 PageRange[] selectedPages = new PageRange[selectedPagesList.size()]; 493 selectedPagesList.toArray(selectedPages); 494 495 return selectedPages; 496 } 497 498 public void destroy() { 499 throwIfNotClosed(); 500 doDestroy(); 501 } 502 503 @Override 504 protected void finalize() throws Throwable { 505 try { 506 if (mState != STATE_DESTROYED) { 507 mCloseGuard.warnIfOpen(); 508 doDestroy(); 509 } 510 } finally { 511 super.finalize(); 512 } 513 } 514 515 private int computePageIndexInDocument(int indexInAdapter) { 516 int skippedAdapterPages = 0; 517 final int selectedPagesCount = mSelectedPages.length; 518 for (int i = 0; i < selectedPagesCount; i++) { 519 PageRange pageRange = PageRangeUtils.asAbsoluteRange( 520 mSelectedPages[i], mDocumentPageCount); 521 skippedAdapterPages += pageRange.getSize(); 522 if (skippedAdapterPages > indexInAdapter) { 523 final int overshoot = skippedAdapterPages - indexInAdapter - 1; 524 return pageRange.getEnd() - overshoot; 525 } 526 } 527 return INVALID_PAGE_INDEX; 528 } 529 530 private int computePageIndexInFile(int pageIndexInDocument) { 531 if (!PageRangeUtils.contains(mSelectedPages, pageIndexInDocument)) { 532 return INVALID_PAGE_INDEX; 533 } 534 if (mWrittenPages == null) { 535 return INVALID_PAGE_INDEX; 536 } 537 538 int indexInFile = INVALID_PAGE_INDEX; 539 final int rangeCount = mWrittenPages.length; 540 for (int i = 0; i < rangeCount; i++) { 541 PageRange pageRange = mWrittenPages[i]; 542 if (!pageRange.contains(pageIndexInDocument)) { 543 indexInFile += pageRange.getSize(); 544 } else { 545 indexInFile += pageIndexInDocument - pageRange.getStart() + 1; 546 return indexInFile; 547 } 548 } 549 return INVALID_PAGE_INDEX; 550 } 551 552 private void setConfirmedPages(PageRange[] pagesInDocument, int documentPageCount) { 553 mConfirmedPagesInDocument.clear(); 554 final int rangeCount = pagesInDocument.length; 555 for (int i = 0; i < rangeCount; i++) { 556 PageRange pageRange = PageRangeUtils.asAbsoluteRange(pagesInDocument[i], 557 documentPageCount); 558 for (int j = pageRange.getStart(); j <= pageRange.getEnd(); j++) { 559 mConfirmedPagesInDocument.put(j, null); 560 } 561 } 562 } 563 564 private void onSelectedPageNotInFile(int pageInDocument) { 565 PageRange[] requestedPages = computeRequestedPages(pageInDocument); 566 if (!Arrays.equals(mRequestedPages, requestedPages)) { 567 mRequestedPages = requestedPages; 568 if (DEBUG) { 569 Log.i(LOG_TAG, "Requesting pages: " + Arrays.toString(mRequestedPages)); 570 } 571 mCallbacks.onRequestContentUpdate(); 572 } 573 } 574 575 private PageRange[] computeRequestedPages(int pageInDocument) { 576 if (mRequestedPages != null && 577 PageRangeUtils.contains(mRequestedPages, pageInDocument)) { 578 return mRequestedPages; 579 } 580 581 List<PageRange> pageRangesList = new ArrayList<>(); 582 583 int remainingPagesToRequest = MAX_PREVIEW_PAGES_BATCH; 584 final int selectedPagesCount = mSelectedPages.length; 585 586 // We always request the pages that are bound, i.e. shown on screen. 587 PageRange[] boundPagesInDocument = computeBoundPagesInDocument(); 588 589 final int boundRangeCount = boundPagesInDocument.length; 590 for (int i = 0; i < boundRangeCount; i++) { 591 PageRange boundRange = boundPagesInDocument[i]; 592 pageRangesList.add(boundRange); 593 } 594 remainingPagesToRequest -= PageRangeUtils.getNormalizedPageCount( 595 boundPagesInDocument, mDocumentPageCount); 596 597 final boolean requestFromStart = mRequestedPages == null 598 || pageInDocument > mRequestedPages[mRequestedPages.length - 1].getEnd(); 599 600 if (!requestFromStart) { 601 if (DEBUG) { 602 Log.i(LOG_TAG, "Requesting from end"); 603 } 604 605 // Reminder that ranges are always normalized. 606 for (int i = selectedPagesCount - 1; i >= 0; i--) { 607 if (remainingPagesToRequest <= 0) { 608 break; 609 } 610 611 PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], 612 mDocumentPageCount); 613 if (pageInDocument < selectedRange.getStart()) { 614 continue; 615 } 616 617 PageRange pagesInRange; 618 int rangeSpan; 619 620 if (selectedRange.contains(pageInDocument)) { 621 rangeSpan = pageInDocument - selectedRange.getStart() + 1; 622 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 623 final int fromPage = Math.max(pageInDocument - rangeSpan - 1, 0); 624 rangeSpan = Math.max(rangeSpan, 0); 625 pagesInRange = new PageRange(fromPage, pageInDocument); 626 } else { 627 rangeSpan = selectedRange.getSize(); 628 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 629 rangeSpan = Math.max(rangeSpan, 0); 630 final int fromPage = Math.max(selectedRange.getEnd() - rangeSpan - 1, 0); 631 final int toPage = selectedRange.getEnd(); 632 pagesInRange = new PageRange(fromPage, toPage); 633 } 634 635 pageRangesList.add(pagesInRange); 636 remainingPagesToRequest -= rangeSpan; 637 } 638 } else { 639 if (DEBUG) { 640 Log.i(LOG_TAG, "Requesting from start"); 641 } 642 643 // Reminder that ranges are always normalized. 644 for (int i = 0; i < selectedPagesCount; i++) { 645 if (remainingPagesToRequest <= 0) { 646 break; 647 } 648 649 PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], 650 mDocumentPageCount); 651 if (pageInDocument > selectedRange.getEnd()) { 652 continue; 653 } 654 655 PageRange pagesInRange; 656 int rangeSpan; 657 658 if (selectedRange.contains(pageInDocument)) { 659 rangeSpan = selectedRange.getEnd() - pageInDocument + 1; 660 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 661 final int toPage = Math.min(pageInDocument + rangeSpan - 1, 662 mDocumentPageCount - 1); 663 pagesInRange = new PageRange(pageInDocument, toPage); 664 } else { 665 rangeSpan = selectedRange.getSize(); 666 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 667 final int fromPage = selectedRange.getStart(); 668 final int toPage = Math.min(selectedRange.getStart() + rangeSpan - 1, 669 mDocumentPageCount - 1); 670 pagesInRange = new PageRange(fromPage, toPage); 671 } 672 673 if (DEBUG) { 674 Log.i(LOG_TAG, "computeRequestedPages() Adding range:" + pagesInRange); 675 } 676 pageRangesList.add(pagesInRange); 677 remainingPagesToRequest -= rangeSpan; 678 } 679 } 680 681 PageRange[] pageRanges = new PageRange[pageRangesList.size()]; 682 pageRangesList.toArray(pageRanges); 683 684 return PageRangeUtils.normalize(pageRanges); 685 } 686 687 private PageRange[] computeBoundPagesInDocument() { 688 List<PageRange> pagesInDocumentList = new ArrayList<>(); 689 690 int fromPage = INVALID_PAGE_INDEX; 691 int toPage = INVALID_PAGE_INDEX; 692 693 final int boundPageCount = mBoundPagesInAdapter.size(); 694 for (int i = 0; i < boundPageCount; i++) { 695 // The container is a sparse array, so keys are sorted in ascending order. 696 final int boundPageInAdapter = mBoundPagesInAdapter.keyAt(i); 697 final int boundPageInDocument = computePageIndexInDocument(boundPageInAdapter); 698 699 if (fromPage == INVALID_PAGE_INDEX) { 700 fromPage = boundPageInDocument; 701 } 702 703 if (toPage == INVALID_PAGE_INDEX) { 704 toPage = boundPageInDocument; 705 } 706 707 if (boundPageInDocument > toPage + 1) { 708 PageRange pageRange = new PageRange(fromPage, toPage); 709 pagesInDocumentList.add(pageRange); 710 fromPage = toPage = boundPageInDocument; 711 } else { 712 toPage = boundPageInDocument; 713 } 714 } 715 716 if (fromPage != INVALID_PAGE_INDEX && toPage != INVALID_PAGE_INDEX) { 717 PageRange pageRange = new PageRange(fromPage, toPage); 718 pagesInDocumentList.add(pageRange); 719 } 720 721 PageRange[] pageInDocument = new PageRange[pagesInDocumentList.size()]; 722 pagesInDocumentList.toArray(pageInDocument); 723 724 if (DEBUG) { 725 Log.i(LOG_TAG, "Bound pages: " + Arrays.toString(pageInDocument)); 726 } 727 728 return pageInDocument; 729 } 730 731 private void recyclePageView(PageContentView page, int pageIndexInAdapter) { 732 PageContentProvider provider = page.getPageContentProvider(); 733 if (provider != null) { 734 page.init(null, null, null, null); 735 mPageContentRepository.releasePageContentProvider(provider); 736 } 737 mBoundPagesInAdapter.remove(pageIndexInAdapter); 738 page.setTag(null); 739 } 740 741 public void startPreloadContent(PageRange pageRangeInAdapter) { 742 final int startPageInDocument = computePageIndexInDocument(pageRangeInAdapter.getStart()); 743 final int startPageInFile = computePageIndexInFile(startPageInDocument); 744 final int endPageInDocument = computePageIndexInDocument(pageRangeInAdapter.getEnd()); 745 final int endPageInFile = computePageIndexInFile(endPageInDocument); 746 if (startPageInDocument != INVALID_PAGE_INDEX && endPageInDocument != INVALID_PAGE_INDEX) { 747 mPageContentRepository.startPreload(startPageInFile, endPageInFile); 748 } 749 } 750 751 public void stopPreloadContent() { 752 mPageContentRepository.stopPreload(); 753 } 754 755 private void doDestroy() { 756 mPageContentRepository.destroy(); 757 mCloseGuard.close(); 758 mState = STATE_DESTROYED; 759 if (DEBUG) { 760 Log.i(LOG_TAG, "STATE_DESTROYED"); 761 } 762 } 763 764 private void throwIfNotOpened() { 765 if (mState != STATE_OPENED) { 766 throw new IllegalStateException("Not opened"); 767 } 768 } 769 770 private void throwIfNotClosed() { 771 if (mState != STATE_CLOSED) { 772 throw new IllegalStateException("Not closed"); 773 } 774 } 775 776 private final class MyViewHolder extends ViewHolder { 777 int mPageInAdapter; 778 779 private MyViewHolder(View itemView) { 780 super(itemView); 781 } 782 } 783 784 private final class PageClickListener implements OnClickListener { 785 @Override 786 public void onClick(View view) { 787 PreviewPageFrame page = (PreviewPageFrame) view; 788 MyViewHolder holder = (MyViewHolder) page.getTag(); 789 final int pageInAdapter = holder.mPageInAdapter; 790 final int pageInDocument = computePageIndexInDocument(pageInAdapter); 791 if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) < 0) { 792 mConfirmedPagesInDocument.put(pageInDocument, null); 793 page.setSelected(true, true); 794 } else { 795 if (mConfirmedPagesInDocument.size() <= 1) { 796 return; 797 } 798 mConfirmedPagesInDocument.remove(pageInDocument); 799 page.setSelected(false, true); 800 } 801 } 802 } 803} 804