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 17 package com.android.printspooler.ui; 18 19 import android.content.Context; 20 import android.graphics.Bitmap; 21 import android.graphics.Canvas; 22 import android.graphics.drawable.BitmapDrawable; 23 import android.os.ParcelFileDescriptor; 24 import android.print.PageRange; 25 import android.print.PrintAttributes.MediaSize; 26 import android.print.PrintAttributes.Margins; 27 import android.print.PrintDocumentInfo; 28 import android.support.v7.widget.RecyclerView.Adapter; 29 import android.support.v7.widget.RecyclerView.ViewHolder; 30 import android.util.Log; 31 import android.util.SparseArray; 32 import android.view.LayoutInflater; 33 import android.view.View; 34 import android.view.View.OnClickListener; 35 import android.view.ViewGroup; 36 import android.view.ViewGroup.LayoutParams; 37 import android.view.View.MeasureSpec; 38 import android.widget.TextView; 39 import com.android.printspooler.R; 40 import com.android.printspooler.model.PageContentRepository; 41 import com.android.printspooler.model.PageContentRepository.PageContentProvider; 42 import com.android.printspooler.util.PageRangeUtils; 43 import com.android.printspooler.widget.PageContentView; 44 import com.android.printspooler.widget.PreviewPageFrame; 45 import dalvik.system.CloseGuard; 46 47 import java.util.ArrayList; 48 import java.util.Arrays; 49 import java.util.List; 50 51 /** 52 * This class represents the adapter for the pages in the print preview list. 53 */ 54 public 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 provider = mPageContentRepository.acquirePageContentProvider( 316 pageIndexInFile, content); 317 mBoundPagesInAdapter.put(position, null); 318 } else { 319 onSelectedPageNotInFile(pageInDocument); 320 } 321 content.init(provider, mEmptyState, mMediaSize, mMinMargins); 322 323 if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) >= 0) { 324 page.setSelected(true, false); 325 } else { 326 page.setSelected(false, false); 327 } 328 329 page.setContentDescription(mContext.getString(R.string.page_description_template, 330 pageInDocument + 1, mDocumentPageCount)); 331 332 TextView pageNumberView = (TextView) page.findViewById(R.id.page_number); 333 String text = mContext.getString(R.string.current_page_template, 334 pageInDocument + 1, mDocumentPageCount); 335 pageNumberView.setText(text); 336 } 337 338 @Override 339 public int getItemCount() { 340 return mSelectedPageCount; 341 } 342 343 @Override 344 public long getItemId(int position) { 345 return computePageIndexInDocument(position); 346 } 347 348 @Override 349 public void onViewRecycled(ViewHolder holder) { 350 MyViewHolder myHolder = (MyViewHolder) holder; 351 PageContentView content = (PageContentView) holder.itemView 352 .findViewById(R.id.page_content); 353 recyclePageView(content, myHolder.mPageInAdapter); 354 myHolder.mPageInAdapter = INVALID_PAGE_INDEX; 355 } 356 357 public PageRange[] getRequestedPages() { 358 return mRequestedPages; 359 } 360 361 public PageRange[] getSelectedPages() { 362 PageRange[] selectedPages = computeSelectedPages(); 363 if (!Arrays.equals(mSelectedPages, selectedPages)) { 364 mSelectedPages = selectedPages; 365 mSelectedPageCount = PageRangeUtils.getNormalizedPageCount( 366 mSelectedPages, mDocumentPageCount); 367 updatePreviewAreaPageSizeAndEmptyState(); 368 notifyDataSetChanged(); 369 } 370 return mSelectedPages; 371 } 372 373 public void onPreviewAreaSizeChanged() { 374 if (mMediaSize != null) { 375 updatePreviewAreaPageSizeAndEmptyState(); 376 notifyDataSetChanged(); 377 } 378 } 379 380 private void updatePreviewAreaPageSizeAndEmptyState() { 381 if (mMediaSize == null) { 382 return; 383 } 384 385 final int availableWidth = mPreviewArea.getWidth(); 386 final int availableHeight = mPreviewArea.getHeight(); 387 388 // Page aspect ratio to keep. 389 final float pageAspectRatio = (float) mMediaSize.getWidthMils() 390 / mMediaSize.getHeightMils(); 391 392 // Make sure we have no empty columns. 393 final int columnCount = Math.min(mSelectedPageCount, mColumnCount); 394 mPreviewArea.setColumnCount(columnCount); 395 396 // Compute max page width. 397 final int horizontalMargins = 2 * columnCount * mPreviewPageMargin; 398 final int horizontalPaddingAndMargins = horizontalMargins + 2 * mPreviewListPadding; 399 final int pageContentDesiredWidth = (int) ((((float) availableWidth 400 - horizontalPaddingAndMargins) / columnCount) + 0.5f); 401 402 // Compute max page height. 403 final int pageContentDesiredHeight = (int) (((float) pageContentDesiredWidth 404 / pageAspectRatio) + 0.5f); 405 406 // If the page does not fit entirely in a vertical direction, 407 // we shirk it but not less than the minimal page width. 408 final int pageContentMinHeight = (int) (mPreviewPageMinWidth / pageAspectRatio + 0.5f); 409 final int pageContentMaxHeight = Math.max(pageContentMinHeight, 410 availableHeight - 2 * (mPreviewListPadding + mPreviewPageMargin) - mFooterHeight); 411 412 mPageContentHeight = Math.min(pageContentDesiredHeight, pageContentMaxHeight); 413 mPageContentWidth = (int) ((mPageContentHeight * pageAspectRatio) + 0.5f); 414 415 final int totalContentWidth = columnCount * mPageContentWidth + horizontalMargins; 416 final int horizontalPadding = (availableWidth - totalContentWidth) / 2; 417 418 final int rowCount = mSelectedPageCount / columnCount 419 + ((mSelectedPageCount % columnCount) > 0 ? 1 : 0); 420 final int totalContentHeight = rowCount * (mPageContentHeight + mFooterHeight + 2 421 * mPreviewPageMargin); 422 423 final int verticalPadding; 424 if (mPageContentHeight + mFooterHeight + mPreviewListPadding 425 + 2 * mPreviewPageMargin > availableHeight) { 426 verticalPadding = Math.max(0, 427 (availableHeight - mPageContentHeight - mFooterHeight) / 2 428 - mPreviewPageMargin); 429 } else { 430 verticalPadding = Math.max(mPreviewListPadding, 431 (availableHeight - totalContentHeight) / 2); 432 } 433 434 mPreviewArea.setPadding(horizontalPadding, verticalPadding, 435 horizontalPadding, verticalPadding); 436 437 // Now update the empty state drawable, as it depends on the page 438 // size and is reused for all views for better performance. 439 LayoutInflater inflater = LayoutInflater.from(mContext); 440 View content = inflater.inflate(R.layout.preview_page_loading, null, false); 441 content.measure(MeasureSpec.makeMeasureSpec(mPageContentWidth, MeasureSpec.EXACTLY), 442 MeasureSpec.makeMeasureSpec(mPageContentHeight, MeasureSpec.EXACTLY)); 443 content.layout(0, 0, content.getMeasuredWidth(), content.getMeasuredHeight()); 444 445 Bitmap bitmap = Bitmap.createBitmap(mPageContentWidth, mPageContentHeight, 446 Bitmap.Config.ARGB_8888); 447 Canvas canvas = new Canvas(bitmap); 448 content.draw(canvas); 449 450 // Do not recycle the old bitmap if such as it may be set as an empty 451 // state to any of the page views. Just let the GC take care of it. 452 mEmptyState = new BitmapDrawable(mContext.getResources(), bitmap); 453 } 454 455 private PageRange[] computeSelectedPages() { 456 ArrayList<PageRange> selectedPagesList = new ArrayList<>(); 457 458 int startPageIndex = INVALID_PAGE_INDEX; 459 int endPageIndex = INVALID_PAGE_INDEX; 460 461 final int pageCount = mConfirmedPagesInDocument.size(); 462 for (int i = 0; i < pageCount; i++) { 463 final int pageIndex = mConfirmedPagesInDocument.keyAt(i); 464 if (startPageIndex == INVALID_PAGE_INDEX) { 465 startPageIndex = endPageIndex = pageIndex; 466 } 467 if (endPageIndex + 1 < pageIndex) { 468 PageRange pageRange = new PageRange(startPageIndex, endPageIndex); 469 selectedPagesList.add(pageRange); 470 startPageIndex = pageIndex; 471 } 472 endPageIndex = pageIndex; 473 } 474 475 if (startPageIndex != INVALID_PAGE_INDEX 476 && endPageIndex != INVALID_PAGE_INDEX) { 477 PageRange pageRange = new PageRange(startPageIndex, endPageIndex); 478 selectedPagesList.add(pageRange); 479 } 480 481 PageRange[] selectedPages = new PageRange[selectedPagesList.size()]; 482 selectedPagesList.toArray(selectedPages); 483 484 return selectedPages; 485 } 486 487 public void destroy(Runnable callback) { 488 throwIfNotClosed(); 489 doDestroy(callback); 490 } 491 492 @Override 493 protected void finalize() throws Throwable { 494 try { 495 if (mState != STATE_DESTROYED) { 496 mCloseGuard.warnIfOpen(); 497 doDestroy(null); 498 } 499 } finally { 500 super.finalize(); 501 } 502 } 503 504 private int computePageIndexInDocument(int indexInAdapter) { 505 int skippedAdapterPages = 0; 506 final int selectedPagesCount = mSelectedPages.length; 507 for (int i = 0; i < selectedPagesCount; i++) { 508 PageRange pageRange = PageRangeUtils.asAbsoluteRange( 509 mSelectedPages[i], mDocumentPageCount); 510 skippedAdapterPages += pageRange.getSize(); 511 if (skippedAdapterPages > indexInAdapter) { 512 final int overshoot = skippedAdapterPages - indexInAdapter - 1; 513 return pageRange.getEnd() - overshoot; 514 } 515 } 516 return INVALID_PAGE_INDEX; 517 } 518 519 private int computePageIndexInFile(int pageIndexInDocument) { 520 if (!PageRangeUtils.contains(mSelectedPages, pageIndexInDocument)) { 521 return INVALID_PAGE_INDEX; 522 } 523 if (mWrittenPages == null) { 524 return INVALID_PAGE_INDEX; 525 } 526 527 int indexInFile = INVALID_PAGE_INDEX; 528 final int rangeCount = mWrittenPages.length; 529 for (int i = 0; i < rangeCount; i++) { 530 PageRange pageRange = mWrittenPages[i]; 531 if (!pageRange.contains(pageIndexInDocument)) { 532 indexInFile += pageRange.getSize(); 533 } else { 534 indexInFile += pageIndexInDocument - pageRange.getStart() + 1; 535 return indexInFile; 536 } 537 } 538 return INVALID_PAGE_INDEX; 539 } 540 541 private void setConfirmedPages(PageRange[] pagesInDocument, int documentPageCount) { 542 mConfirmedPagesInDocument.clear(); 543 final int rangeCount = pagesInDocument.length; 544 for (int i = 0; i < rangeCount; i++) { 545 PageRange pageRange = PageRangeUtils.asAbsoluteRange(pagesInDocument[i], 546 documentPageCount); 547 for (int j = pageRange.getStart(); j <= pageRange.getEnd(); j++) { 548 mConfirmedPagesInDocument.put(j, null); 549 } 550 } 551 } 552 553 private void onSelectedPageNotInFile(int pageInDocument) { 554 PageRange[] requestedPages = computeRequestedPages(pageInDocument); 555 if (!Arrays.equals(mRequestedPages, requestedPages)) { 556 mRequestedPages = requestedPages; 557 if (DEBUG) { 558 Log.i(LOG_TAG, "Requesting pages: " + Arrays.toString(mRequestedPages)); 559 } 560 mCallbacks.onRequestContentUpdate(); 561 } 562 } 563 564 private PageRange[] computeRequestedPages(int pageInDocument) { 565 if (mRequestedPages != null && 566 PageRangeUtils.contains(mRequestedPages, pageInDocument)) { 567 return mRequestedPages; 568 } 569 570 List<PageRange> pageRangesList = new ArrayList<>(); 571 572 int remainingPagesToRequest = MAX_PREVIEW_PAGES_BATCH; 573 final int selectedPagesCount = mSelectedPages.length; 574 575 // We always request the pages that are bound, i.e. shown on screen. 576 PageRange[] boundPagesInDocument = computeBoundPagesInDocument(); 577 578 final int boundRangeCount = boundPagesInDocument.length; 579 for (int i = 0; i < boundRangeCount; i++) { 580 PageRange boundRange = boundPagesInDocument[i]; 581 pageRangesList.add(boundRange); 582 } 583 remainingPagesToRequest -= PageRangeUtils.getNormalizedPageCount( 584 boundPagesInDocument, mDocumentPageCount); 585 586 final boolean requestFromStart = mRequestedPages == null 587 || pageInDocument > mRequestedPages[mRequestedPages.length - 1].getEnd(); 588 589 if (!requestFromStart) { 590 if (DEBUG) { 591 Log.i(LOG_TAG, "Requesting from end"); 592 } 593 594 // Reminder that ranges are always normalized. 595 for (int i = selectedPagesCount - 1; i >= 0; i--) { 596 if (remainingPagesToRequest <= 0) { 597 break; 598 } 599 600 PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], 601 mDocumentPageCount); 602 if (pageInDocument < selectedRange.getStart()) { 603 continue; 604 } 605 606 PageRange pagesInRange; 607 int rangeSpan; 608 609 if (selectedRange.contains(pageInDocument)) { 610 rangeSpan = pageInDocument - selectedRange.getStart() + 1; 611 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 612 final int fromPage = Math.max(pageInDocument - rangeSpan - 1, 0); 613 rangeSpan = Math.max(rangeSpan, 0); 614 pagesInRange = new PageRange(fromPage, pageInDocument); 615 } else { 616 rangeSpan = selectedRange.getSize(); 617 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 618 rangeSpan = Math.max(rangeSpan, 0); 619 final int fromPage = Math.max(selectedRange.getEnd() - rangeSpan - 1, 0); 620 final int toPage = selectedRange.getEnd(); 621 pagesInRange = new PageRange(fromPage, toPage); 622 } 623 624 pageRangesList.add(pagesInRange); 625 remainingPagesToRequest -= rangeSpan; 626 } 627 } else { 628 if (DEBUG) { 629 Log.i(LOG_TAG, "Requesting from start"); 630 } 631 632 // Reminder that ranges are always normalized. 633 for (int i = 0; i < selectedPagesCount; i++) { 634 if (remainingPagesToRequest <= 0) { 635 break; 636 } 637 638 PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], 639 mDocumentPageCount); 640 if (pageInDocument > selectedRange.getEnd()) { 641 continue; 642 } 643 644 PageRange pagesInRange; 645 int rangeSpan; 646 647 if (selectedRange.contains(pageInDocument)) { 648 rangeSpan = selectedRange.getEnd() - pageInDocument + 1; 649 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 650 final int toPage = Math.min(pageInDocument + rangeSpan - 1, 651 mDocumentPageCount - 1); 652 pagesInRange = new PageRange(pageInDocument, toPage); 653 } else { 654 rangeSpan = selectedRange.getSize(); 655 rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); 656 final int fromPage = selectedRange.getStart(); 657 final int toPage = Math.min(selectedRange.getStart() + rangeSpan - 1, 658 mDocumentPageCount - 1); 659 pagesInRange = new PageRange(fromPage, toPage); 660 } 661 662 if (DEBUG) { 663 Log.i(LOG_TAG, "computeRequestedPages() Adding range:" + pagesInRange); 664 } 665 pageRangesList.add(pagesInRange); 666 remainingPagesToRequest -= rangeSpan; 667 } 668 } 669 670 PageRange[] pageRanges = new PageRange[pageRangesList.size()]; 671 pageRangesList.toArray(pageRanges); 672 673 return PageRangeUtils.normalize(pageRanges); 674 } 675 676 private PageRange[] computeBoundPagesInDocument() { 677 List<PageRange> pagesInDocumentList = new ArrayList<>(); 678 679 int fromPage = INVALID_PAGE_INDEX; 680 int toPage = INVALID_PAGE_INDEX; 681 682 final int boundPageCount = mBoundPagesInAdapter.size(); 683 for (int i = 0; i < boundPageCount; i++) { 684 // The container is a sparse array, so keys are sorted in ascending order. 685 final int boundPageInAdapter = mBoundPagesInAdapter.keyAt(i); 686 final int boundPageInDocument = computePageIndexInDocument(boundPageInAdapter); 687 688 if (fromPage == INVALID_PAGE_INDEX) { 689 fromPage = boundPageInDocument; 690 } 691 692 if (toPage == INVALID_PAGE_INDEX) { 693 toPage = boundPageInDocument; 694 } 695 696 if (boundPageInDocument > toPage + 1) { 697 PageRange pageRange = new PageRange(fromPage, toPage); 698 pagesInDocumentList.add(pageRange); 699 fromPage = toPage = boundPageInDocument; 700 } else { 701 toPage = boundPageInDocument; 702 } 703 } 704 705 if (fromPage != INVALID_PAGE_INDEX && toPage != INVALID_PAGE_INDEX) { 706 PageRange pageRange = new PageRange(fromPage, toPage); 707 pagesInDocumentList.add(pageRange); 708 } 709 710 PageRange[] pageInDocument = new PageRange[pagesInDocumentList.size()]; 711 pagesInDocumentList.toArray(pageInDocument); 712 713 if (DEBUG) { 714 Log.i(LOG_TAG, "Bound pages: " + Arrays.toString(pageInDocument)); 715 } 716 717 return pageInDocument; 718 } 719 720 private void recyclePageView(PageContentView page, int pageIndexInAdapter) { 721 PageContentProvider provider = page.getPageContentProvider(); 722 if (provider != null) { 723 page.init(null, mEmptyState, mMediaSize, mMinMargins); 724 mPageContentRepository.releasePageContentProvider(provider); 725 } 726 mBoundPagesInAdapter.remove(pageIndexInAdapter); 727 page.setTag(null); 728 } 729 730 public void startPreloadContent(PageRange pageRangeInAdapter) { 731 final int startPageInDocument = computePageIndexInDocument(pageRangeInAdapter.getStart()); 732 final int startPageInFile = computePageIndexInFile(startPageInDocument); 733 final int endPageInDocument = computePageIndexInDocument(pageRangeInAdapter.getEnd()); 734 final int endPageInFile = computePageIndexInFile(endPageInDocument); 735 if (startPageInDocument != INVALID_PAGE_INDEX && endPageInDocument != INVALID_PAGE_INDEX) { 736 mPageContentRepository.startPreload(startPageInFile, endPageInFile); 737 } 738 } 739 740 public void stopPreloadContent() { 741 mPageContentRepository.stopPreload(); 742 } 743 744 private void doDestroy(Runnable callback) { 745 mPageContentRepository.destroy(callback); 746 mCloseGuard.close(); 747 mState = STATE_DESTROYED; 748 if (DEBUG) { 749 Log.i(LOG_TAG, "STATE_DESTROYED"); 750 } 751 } 752 753 private void throwIfNotOpened() { 754 if (mState != STATE_OPENED) { 755 throw new IllegalStateException("Not opened"); 756 } 757 } 758 759 private void throwIfNotClosed() { 760 if (mState != STATE_CLOSED) { 761 throw new IllegalStateException("Not closed"); 762 } 763 } 764 765 private final class MyViewHolder extends ViewHolder { 766 int mPageInAdapter; 767 768 private MyViewHolder(View itemView) { 769 super(itemView); 770 } 771 } 772 773 private final class PageClickListener implements OnClickListener { 774 @Override 775 public void onClick(View view) { 776 PreviewPageFrame page = (PreviewPageFrame) view; 777 MyViewHolder holder = (MyViewHolder) page.getTag(); 778 final int pageInAdapter = holder.mPageInAdapter; 779 final int pageInDocument = computePageIndexInDocument(pageInAdapter); 780 if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) < 0) { 781 mConfirmedPagesInDocument.put(pageInDocument, null); 782 page.setSelected(true, true); 783 } else { 784 if (mConfirmedPagesInDocument.size() <= 1) { 785 return; 786 } 787 mConfirmedPagesInDocument.remove(pageInDocument); 788 page.setSelected(false, true); 789 } 790 } 791 } 792 } 793
