PageAdapter.java revision 0d2d9637ed4f46062d508cfa7da0e9776fc444f8
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 return new MyViewHolder(page); 278 } 279 280 @Override 281 public void onBindViewHolder(ViewHolder holder, int position) { 282 if (DEBUG) { 283 Log.i(LOG_TAG, "Binding holder: " + holder + " with id: " + getItemId(position) 284 + " for position: " + position); 285 } 286 287 MyViewHolder myHolder = (MyViewHolder) holder; 288 289 PreviewPageFrame page = (PreviewPageFrame) holder.itemView; 290 page.setOnClickListener(mPageClickListener); 291 292 page.setTag(holder); 293 294 myHolder.mPageInAdapter = position; 295 296 final int pageInDocument = computePageIndexInDocument(position); 297 final int pageIndexInFile = computePageIndexInFile(pageInDocument); 298 299 PageContentView content = (PageContentView) page.findViewById(R.id.page_content); 300 301 LayoutParams params = content.getLayoutParams(); 302 params.width = mPageContentWidth; 303 params.height = mPageContentHeight; 304 305 PageContentProvider provider = content.getPageContentProvider(); 306 307 if (pageIndexInFile != INVALID_PAGE_INDEX) { 308 if (DEBUG) { 309 Log.i(LOG_TAG, "Binding provider:" 310 + " pageIndexInAdapter: " + position 311 + ", pageInDocument: " + pageInDocument 312 + ", pageIndexInFile: " + pageIndexInFile); 313 } 314 315 if (provider != null && provider.getPageIndex() != pageIndexInFile) { 316 mPageContentRepository.releasePageContentProvider(provider); 317 } 318 319 provider = mPageContentRepository.acquirePageContentProvider( 320 pageIndexInFile, content); 321 mBoundPagesInAdapter.put(position, null); 322 } else { 323 onSelectedPageNotInFile(pageInDocument); 324 } 325 content.init(provider, mEmptyState, mMediaSize, mMinMargins); 326 327 if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) >= 0) { 328 page.setSelected(true, false); 329 } else { 330 page.setSelected(false, false); 331 } 332 333 page.setContentDescription(mContext.getString(R.string.page_description_template, 334 pageInDocument + 1, mDocumentPageCount)); 335 336 TextView pageNumberView = (TextView) page.findViewById(R.id.page_number); 337 String text = mContext.getString(R.string.current_page_template, 338 pageInDocument + 1, mDocumentPageCount); 339 pageNumberView.setText(text); 340 } 341 342 @Override 343 public int getItemCount() { 344 return mSelectedPageCount; 345 } 346 347 @Override 348 public long getItemId(int position) { 349 return computePageIndexInDocument(position); 350 } 351 352 @Override 353 public void onViewRecycled(ViewHolder holder) { 354 MyViewHolder myHolder = (MyViewHolder) holder; 355 PageContentView content = (PageContentView) holder.itemView 356 .findViewById(R.id.page_content); 357 recyclePageView(content, myHolder.mPageInAdapter); 358 myHolder.mPageInAdapter = INVALID_PAGE_INDEX; 359 } 360 361 public PageRange[] getRequestedPages() { 362 return mRequestedPages; 363 } 364 365 public PageRange[] getSelectedPages() { 366 PageRange[] selectedPages = computeSelectedPages(); 367 if (!Arrays.equals(mSelectedPages, selectedPages)) { 368 mSelectedPages = selectedPages; 369 mSelectedPageCount = PageRangeUtils.getNormalizedPageCount( 370 mSelectedPages, mDocumentPageCount); 371 updatePreviewAreaPageSizeAndEmptyState(); 372 notifyDataSetChanged(); 373 } 374 return mSelectedPages; 375 } 376 377 public void onPreviewAreaSizeChanged() { 378 if (mMediaSize != null) { 379 updatePreviewAreaPageSizeAndEmptyState(); 380 notifyDataSetChanged(); 381 } 382 } 383 384 private void updatePreviewAreaPageSizeAndEmptyState() { 385 if (mMediaSize == null) { 386 return; 387 } 388 389 final int availableWidth = mPreviewArea.getWidth(); 390 final int availableHeight = mPreviewArea.getHeight(); 391 392 // Page aspect ratio to keep. 393 final float pageAspectRatio = (float) mMediaSize.getWidthMils() 394 / mMediaSize.getHeightMils(); 395 396 // Make sure we have no empty columns. 397 final int columnCount = Math.min(mSelectedPageCount, mColumnCount); 398 mPreviewArea.setColumnCount(columnCount); 399 400 // Compute max page width. 401 final int horizontalMargins = 2 * columnCount * mPreviewPageMargin; 402 final int horizontalPaddingAndMargins = horizontalMargins + 2 * mPreviewListPadding; 403 final int pageContentDesiredWidth = (int) ((((float) availableWidth 404 - horizontalPaddingAndMargins) / columnCount) + 0.5f); 405 406 // Compute max page height. 407 final int pageContentDesiredHeight = (int) (((float) pageContentDesiredWidth 408 / pageAspectRatio) + 0.5f); 409 410 // If the page does not fit entirely in a vertical direction, 411 // we shirk it but not less than the minimal page width. 412 final int pageContentMinHeight = (int) (mPreviewPageMinWidth / pageAspectRatio + 0.5f); 413 final int pageContentMaxHeight = Math.max(pageContentMinHeight, 414 availableHeight - 2 * (mPreviewListPadding + mPreviewPageMargin) - mFooterHeight); 415 416 mPageContentHeight = Math.min(pageContentDesiredHeight, pageContentMaxHeight); 417 mPageContentWidth = (int) ((mPageContentHeight * pageAspectRatio) + 0.5f); 418 419 final int totalContentWidth = columnCount * mPageContentWidth + horizontalMargins; 420 final int horizontalPadding = (availableWidth - totalContentWidth) / 2; 421 422 final int rowCount = mSelectedPageCount / columnCount 423 + ((mSelectedPageCount % columnCount) > 0 ? 1 : 0); 424 final int totalContentHeight = rowCount * (mPageContentHeight + mFooterHeight + 2 425 * mPreviewPageMargin); 426 427 final int verticalPadding; 428 if (mPageContentHeight + mFooterHeight + mPreviewListPadding 429 + 2 * mPreviewPageMargin > availableHeight) { 430 verticalPadding = Math.max(0, 431 (availableHeight - mPageContentHeight - mFooterHeight) / 2 432 - mPreviewPageMargin); 433 } else { 434 verticalPadding = Math.max(mPreviewListPadding, 435 (availableHeight - totalContentHeight) / 2); 436 } 437 438 mPreviewArea.setPadding(horizontalPadding, verticalPadding, 439 horizontalPadding, verticalPadding); 440 441 // Now update the empty state drawable, as it depends on the page 442 // size and is reused for all views for better performance. 443 LayoutInflater inflater = LayoutInflater.from(mContext); 444 View content = inflater.inflate(R.layout.preview_page_loading, null, false); 445 content.measure(MeasureSpec.makeMeasureSpec(mPageContentWidth, MeasureSpec.EXACTLY), 446 MeasureSpec.makeMeasureSpec(mPageContentHeight, MeasureSpec.EXACTLY)); 447 content.layout(0, 0, content.getMeasuredWidth(), content.getMeasuredHeight()); 448 449 Bitmap bitmap = Bitmap.createBitmap(mPageContentWidth, mPageContentHeight, 450 Bitmap.Config.ARGB_8888); 451 Canvas canvas = new Canvas(bitmap); 452 content.draw(canvas); 453 454 // Do not recycle the old bitmap if such as it may be set as an empty 455 // state to any of the page views. Just let the GC take care of it. 456 mEmptyState = new BitmapDrawable(mContext.getResources(), bitmap); 457 } 458 459 private PageRange[] computeSelectedPages() { 460 ArrayList<PageRange> selectedPagesList = new ArrayList<>(); 461 462 int startPageIndex = INVALID_PAGE_INDEX; 463 int endPageIndex = INVALID_PAGE_INDEX; 464 465 final int pageCount = mConfirmedPagesInDocument.size(); 466 for (int i = 0; i < pageCount; i++) { 467 final int pageIndex = mConfirmedPagesInDocument.keyAt(i); 468 if (startPageIndex == INVALID_PAGE_INDEX) { 469 startPageIndex = endPageIndex = pageIndex; 470 } 471 if (endPageIndex + 1 < pageIndex) { 472 PageRange pageRange = new PageRange(startPageIndex, endPageIndex); 473 selectedPagesList.add(pageRange); 474 startPageIndex = pageIndex; 475 } 476 endPageIndex = pageIndex; 477 } 478 479 if (startPageIndex != INVALID_PAGE_INDEX 480 && endPageIndex != INVALID_PAGE_INDEX) { 481 PageRange pageRange = new PageRange(startPageIndex, endPageIndex); 482 selectedPagesList.add(pageRange); 483 } 484 485 PageRange[] selectedPages = new PageRange[selectedPagesList.size()]; 486 selectedPagesList.toArray(selectedPages); 487 488 return selectedPages; 489 } 490 491 public void destroy() { 492 throwIfNotClosed(); 493 doDestroy(); 494 } 495 496 @Override 497 protected void finalize() throws Throwable { 498 try { 499 if (mState != STATE_DESTROYED) { 500 mCloseGuard.warnIfOpen(); 501 doDestroy(); 502 } 503 } finally { 504 super.finalize(); 505 } 506 } 507 508 private int computePageIndexInDocument(int indexInAdapter) { 509 int skippedAdapterPages = 0; 510 final int selectedPagesCount = mSelectedPages.length; 511 for (int i = 0; i < selectedPagesCount; i++) { 512 PageRange pageRange = PageRangeUtils.asAbsoluteRange( 513 mSelectedPages[i], mDocumentPageCount); 514 skippedAdapterPages += pageRange.getSize(); 515 if (skippedAdapterPages > indexInAdapter) { 516 final int overshoot = skippedAdapterPages - indexInAdapter - 1; 517 return pageRange.getEnd() - overshoot; 518 } 519 } 520 return INVALID_PAGE_INDEX; 521 } 522 523 private int computePageIndexInFile(int pageIndexInDocument) { 524 if (!PageRangeUtils.contains(mSelectedPages, pageIndexInDocument)) { 525 return INVALID_PAGE_INDEX; 526 } 527 if (mWrittenPages == null) { 528 return INVALID_PAGE_INDEX; 529 } 530 531 int indexInFile = INVALID_PAGE_INDEX; 532 final int rangeCount = mWrittenPages.length; 533 for (int i = 0; i < rangeCount; i++) { 534 PageRange pageRange = mWrittenPages[i]; 535 if (!pageRange.contains(pageIndexInDocument)) { 536 indexInFile += pageRange.getSize(); 537 } else { 538 indexInFile += pageIndexInDocument - pageRange.getStart() + 1; 539 return indexInFile; 540 } 541 } 542 return INVALID_PAGE_INDEX; 543 } 544 545 private void setConfirmedPages(PageRange[] pagesInDocument, int documentPageCount) { 546 mConfirmedPagesInDocument.clear(); 547 final int rangeCount = pagesInDocument.length; 548 for (int i = 0; i < rangeCount; i++) { 549 PageRange pageRange = PageRangeUtils.asAbsoluteRange(pagesInDocument[i], 550 documentPageCount); 551 for (int j = pageRange.getStart(); j <= pageRange.getEnd(); j++) { 552 mConfirmedPagesInDocument.put(j, null); 553 } 554 } 555 } 556 557 private void onSelectedPageNotInFile(int pageInDocument) { 558 PageRange[] requestedPages = computeRequestedPages(pageInDocument); 559 if (!Arrays.equals(mRequestedPages, requestedPages)) { 560 mRequestedPages = requestedPages; 561 if (DEBUG) { 562 Log.i(LOG_TAG, "Requesting pages: " + Arrays.toString(mRequestedPages)); 563 } 564 mCallbacks.onRequestContentUpdate(); 565 } 566 } 567 568 private PageRange[] computeRequestedPages(int pageInDocument) { 569 if (mRequestedPages != null && 570 PageRangeUtils.contains(mRequestedPages, pageInDocument)) { 571 return mRequestedPages; 572 } 573 574 List<PageRange> pageRangesList = new ArrayList<>(); 575 576 int remainingPagesToRequest = MAX_PREVIEW_PAGES_BATCH; 577 final int selectedPagesCount = mSelectedPages.length; 578 579 // We always request the pages that are bound, i.e. shown on screen. 580 PageRange[] boundPagesInDocument = computeBoundPagesInDocument(); 581 582 final int boundRangeCount = boundPagesInDocument.length; 583 for (int i = 0; i < boundRangeCount; i++) { 584 PageRange boundRange = boundPagesInDocument[i]; 585 pageRangesList.add(boundRange); 586 } 587 remainingPagesToRequest -= PageRangeUtils.getNormalizedPageCount( 588 boundPagesInDocument, mDocumentPageCount); 589 590 final boolean requestFromStart = mRequestedPages == null 591 || pageInDocument > mRequestedPages[mRequestedPages.length - 1].getEnd(); 592 593 if (!requestFromStart) { 594 if (DEBUG) { 595 Log.i(LOG_TAG, "Requesting from end"); 596 } 597 598 // Reminder that ranges are always normalized. 599 for (int i = selectedPagesCount - 1; i >= 0; i--) { 600 if (remainingPagesToRequest <= 0) { 601 break; 602 } 603 604 PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], 605 mDocumentPageCount); 606 if (pageInDocument < selectedRange.getStart()) { 607 continue; 608 } 609 610 PageRange pagesInRange; 611 int rangeSpan; 612 613 if (selectedRange.contains(pageInDocument)) { 614 rangeSpan = pageInDocument - selectedRange.getStart() + 1; 615 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 616 final int fromPage = Math.max(pageInDocument - rangeSpan - 1, 0); 617 rangeSpan = Math.max(rangeSpan, 0); 618 pagesInRange = new PageRange(fromPage, pageInDocument); 619 } else { 620 rangeSpan = selectedRange.getSize(); 621 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 622 rangeSpan = Math.max(rangeSpan, 0); 623 final int fromPage = Math.max(selectedRange.getEnd() - rangeSpan - 1, 0); 624 final int toPage = selectedRange.getEnd(); 625 pagesInRange = new PageRange(fromPage, toPage); 626 } 627 628 pageRangesList.add(pagesInRange); 629 remainingPagesToRequest -= rangeSpan; 630 } 631 } else { 632 if (DEBUG) { 633 Log.i(LOG_TAG, "Requesting from start"); 634 } 635 636 // Reminder that ranges are always normalized. 637 for (int i = 0; i < selectedPagesCount; i++) { 638 if (remainingPagesToRequest <= 0) { 639 break; 640 } 641 642 PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], 643 mDocumentPageCount); 644 if (pageInDocument > selectedRange.getEnd()) { 645 continue; 646 } 647 648 PageRange pagesInRange; 649 int rangeSpan; 650 651 if (selectedRange.contains(pageInDocument)) { 652 rangeSpan = selectedRange.getEnd() - pageInDocument + 1; 653 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 654 final int toPage = Math.min(pageInDocument + rangeSpan - 1, 655 mDocumentPageCount - 1); 656 pagesInRange = new PageRange(pageInDocument, toPage); 657 } else { 658 rangeSpan = selectedRange.getSize(); 659 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 660 final int fromPage = selectedRange.getStart(); 661 final int toPage = Math.min(selectedRange.getStart() + rangeSpan - 1, 662 mDocumentPageCount - 1); 663 pagesInRange = new PageRange(fromPage, toPage); 664 } 665 666 if (DEBUG) { 667 Log.i(LOG_TAG, "computeRequestedPages() Adding range:" + pagesInRange); 668 } 669 pageRangesList.add(pagesInRange); 670 remainingPagesToRequest -= rangeSpan; 671 } 672 } 673 674 PageRange[] pageRanges = new PageRange[pageRangesList.size()]; 675 pageRangesList.toArray(pageRanges); 676 677 return PageRangeUtils.normalize(pageRanges); 678 } 679 680 private PageRange[] computeBoundPagesInDocument() { 681 List<PageRange> pagesInDocumentList = new ArrayList<>(); 682 683 int fromPage = INVALID_PAGE_INDEX; 684 int toPage = INVALID_PAGE_INDEX; 685 686 final int boundPageCount = mBoundPagesInAdapter.size(); 687 for (int i = 0; i < boundPageCount; i++) { 688 // The container is a sparse array, so keys are sorted in ascending order. 689 final int boundPageInAdapter = mBoundPagesInAdapter.keyAt(i); 690 final int boundPageInDocument = computePageIndexInDocument(boundPageInAdapter); 691 692 if (fromPage == INVALID_PAGE_INDEX) { 693 fromPage = boundPageInDocument; 694 } 695 696 if (toPage == INVALID_PAGE_INDEX) { 697 toPage = boundPageInDocument; 698 } 699 700 if (boundPageInDocument > toPage + 1) { 701 PageRange pageRange = new PageRange(fromPage, toPage); 702 pagesInDocumentList.add(pageRange); 703 fromPage = toPage = boundPageInDocument; 704 } else { 705 toPage = boundPageInDocument; 706 } 707 } 708 709 if (fromPage != INVALID_PAGE_INDEX && toPage != INVALID_PAGE_INDEX) { 710 PageRange pageRange = new PageRange(fromPage, toPage); 711 pagesInDocumentList.add(pageRange); 712 } 713 714 PageRange[] pageInDocument = new PageRange[pagesInDocumentList.size()]; 715 pagesInDocumentList.toArray(pageInDocument); 716 717 if (DEBUG) { 718 Log.i(LOG_TAG, "Bound pages: " + Arrays.toString(pageInDocument)); 719 } 720 721 return pageInDocument; 722 } 723 724 private void recyclePageView(PageContentView page, int pageIndexInAdapter) { 725 PageContentProvider provider = page.getPageContentProvider(); 726 if (provider != null) { 727 page.init(null, mEmptyState, mMediaSize, mMinMargins); 728 mPageContentRepository.releasePageContentProvider(provider); 729 } 730 mBoundPagesInAdapter.remove(pageIndexInAdapter); 731 page.setTag(null); 732 } 733 734 public void startPreloadContent(PageRange pageRangeInAdapter) { 735 final int startPageInDocument = computePageIndexInDocument(pageRangeInAdapter.getStart()); 736 final int startPageInFile = computePageIndexInFile(startPageInDocument); 737 final int endPageInDocument = computePageIndexInDocument(pageRangeInAdapter.getEnd()); 738 final int endPageInFile = computePageIndexInFile(endPageInDocument); 739 if (startPageInDocument != INVALID_PAGE_INDEX && endPageInDocument != INVALID_PAGE_INDEX) { 740 mPageContentRepository.startPreload(startPageInFile, endPageInFile); 741 } 742 } 743 744 public void stopPreloadContent() { 745 mPageContentRepository.stopPreload(); 746 } 747 748 private void doDestroy() { 749 mPageContentRepository.destroy(); 750 mCloseGuard.close(); 751 mState = STATE_DESTROYED; 752 if (DEBUG) { 753 Log.i(LOG_TAG, "STATE_DESTROYED"); 754 } 755 } 756 757 private void throwIfNotOpened() { 758 if (mState != STATE_OPENED) { 759 throw new IllegalStateException("Not opened"); 760 } 761 } 762 763 private void throwIfNotClosed() { 764 if (mState != STATE_CLOSED) { 765 throw new IllegalStateException("Not closed"); 766 } 767 } 768 769 private final class MyViewHolder extends ViewHolder { 770 int mPageInAdapter; 771 772 private MyViewHolder(View itemView) { 773 super(itemView); 774 } 775 } 776 777 private final class PageClickListener implements OnClickListener { 778 @Override 779 public void onClick(View view) { 780 PreviewPageFrame page = (PreviewPageFrame) view; 781 MyViewHolder holder = (MyViewHolder) page.getTag(); 782 final int pageInAdapter = holder.mPageInAdapter; 783 final int pageInDocument = computePageIndexInDocument(pageInAdapter); 784 if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) < 0) { 785 mConfirmedPagesInDocument.put(pageInDocument, null); 786 page.setSelected(true, true); 787 } else { 788 if (mConfirmedPagesInDocument.size() <= 1) { 789 return; 790 } 791 mConfirmedPagesInDocument.remove(pageInDocument); 792 page.setSelected(false, true); 793 } 794 } 795 } 796} 797