Aurimas Liutikas | 88c7ff1 | 2023-08-10 12:42:26 -0700 | [diff] [blame] | 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.annotation.NonNull; |
| 20 | import android.content.Context; |
| 21 | import android.graphics.Bitmap; |
| 22 | import android.graphics.Canvas; |
| 23 | import android.graphics.drawable.BitmapDrawable; |
| 24 | import android.os.Handler; |
| 25 | import android.os.Looper; |
| 26 | import android.os.ParcelFileDescriptor; |
| 27 | import android.print.PageRange; |
| 28 | import android.print.PrintAttributes.Margins; |
| 29 | import android.print.PrintAttributes.MediaSize; |
| 30 | import android.print.PrintDocumentInfo; |
| 31 | import android.support.v7.widget.RecyclerView.Adapter; |
| 32 | import android.support.v7.widget.RecyclerView.ViewHolder; |
| 33 | import android.util.Log; |
| 34 | import android.util.SparseArray; |
| 35 | import android.view.LayoutInflater; |
| 36 | import android.view.View; |
| 37 | import android.view.View.MeasureSpec; |
| 38 | import android.view.View.OnClickListener; |
| 39 | import android.view.ViewGroup; |
| 40 | import android.view.ViewGroup.LayoutParams; |
| 41 | import android.widget.TextView; |
| 42 | |
| 43 | import com.android.printspooler.R; |
| 44 | import com.android.printspooler.model.OpenDocumentCallback; |
| 45 | import com.android.printspooler.model.PageContentRepository; |
| 46 | import com.android.printspooler.model.PageContentRepository.PageContentProvider; |
| 47 | import com.android.printspooler.util.PageRangeUtils; |
| 48 | import com.android.printspooler.widget.PageContentView; |
| 49 | import com.android.printspooler.widget.PreviewPageFrame; |
| 50 | |
| 51 | import dalvik.system.CloseGuard; |
| 52 | |
| 53 | import java.util.ArrayList; |
| 54 | import java.util.Arrays; |
| 55 | import java.util.List; |
| 56 | |
| 57 | /** |
| 58 | * This class represents the adapter for the pages in the print preview list. |
| 59 | */ |
| 60 | public final class PageAdapter extends Adapter<ViewHolder> { |
| 61 | private static final String LOG_TAG = "PageAdapter"; |
| 62 | |
| 63 | private static final int MAX_PREVIEW_PAGES_BATCH = 50; |
| 64 | |
| 65 | private static final boolean DEBUG = false; |
| 66 | |
| 67 | private static final PageRange[] ALL_PAGES_ARRAY = new PageRange[] { |
| 68 | PageRange.ALL_PAGES |
| 69 | }; |
| 70 | |
| 71 | private static final int INVALID_PAGE_INDEX = -1; |
| 72 | |
| 73 | private static final int STATE_CLOSED = 0; |
| 74 | private static final int STATE_OPENED = 1; |
| 75 | private static final int STATE_DESTROYED = 2; |
| 76 | |
| 77 | private final CloseGuard mCloseGuard = CloseGuard.get(); |
| 78 | |
| 79 | private final SparseArray<Void> mBoundPagesInAdapter = new SparseArray<>(); |
| 80 | private final SparseArray<Void> mConfirmedPagesInDocument = new SparseArray<>(); |
| 81 | |
| 82 | private final PageClickListener mPageClickListener = new PageClickListener(); |
| 83 | |
| 84 | private final Context mContext; |
| 85 | private final LayoutInflater mLayoutInflater; |
| 86 | |
| 87 | private final ContentCallbacks mCallbacks; |
| 88 | private final PageContentRepository mPageContentRepository; |
| 89 | private final PreviewArea mPreviewArea; |
| 90 | |
| 91 | // Which document pages to be written. |
| 92 | private PageRange[] mRequestedPages; |
| 93 | // Pages written in the current file. |
| 94 | private PageRange[] mWrittenPages; |
| 95 | // Pages the user selected in the UI. |
| 96 | private PageRange[] mSelectedPages; |
| 97 | |
| 98 | private BitmapDrawable mEmptyState; |
| 99 | private BitmapDrawable mErrorState; |
| 100 | |
| 101 | private int mDocumentPageCount = PrintDocumentInfo.PAGE_COUNT_UNKNOWN; |
| 102 | private int mSelectedPageCount; |
| 103 | |
| 104 | private int mPreviewPageMargin; |
| 105 | private int mPreviewPageMinWidth; |
| 106 | private int mPreviewListPadding; |
| 107 | private int mFooterHeight; |
| 108 | |
| 109 | private int mColumnCount; |
| 110 | |
| 111 | private MediaSize mMediaSize; |
| 112 | private Margins mMinMargins; |
| 113 | |
| 114 | private int mState; |
| 115 | |
| 116 | private int mPageContentWidth; |
| 117 | private int mPageContentHeight; |
| 118 | |
| 119 | public interface ContentCallbacks { |
| 120 | public void onRequestContentUpdate(); |
| 121 | public void onMalformedPdfFile(); |
| 122 | public void onSecurePdfFile(); |
| 123 | } |
| 124 | |
| 125 | public interface PreviewArea { |
| 126 | public int getWidth(); |
| 127 | public int getHeight(); |
| 128 | public void setColumnCount(int columnCount); |
| 129 | public void setPadding(int left, int top, int right, int bottom); |
| 130 | } |
| 131 | |
| 132 | public PageAdapter(Context context, ContentCallbacks callbacks, PreviewArea previewArea) { |
| 133 | mContext = context; |
| 134 | mCallbacks = callbacks; |
| 135 | mLayoutInflater = (LayoutInflater) context.getSystemService( |
| 136 | Context.LAYOUT_INFLATER_SERVICE); |
| 137 | mPageContentRepository = new PageContentRepository(context); |
| 138 | |
| 139 | mPreviewPageMargin = mContext.getResources().getDimensionPixelSize( |
| 140 | R.dimen.preview_page_margin); |
| 141 | |
| 142 | mPreviewPageMinWidth = mContext.getResources().getDimensionPixelSize( |
| 143 | R.dimen.preview_page_min_width); |
| 144 | |
| 145 | mPreviewListPadding = mContext.getResources().getDimensionPixelSize( |
| 146 | R.dimen.preview_list_padding); |
| 147 | |
| 148 | mColumnCount = mContext.getResources().getInteger( |
| 149 | R.integer.preview_page_per_row_count); |
| 150 | |
| 151 | mFooterHeight = mContext.getResources().getDimensionPixelSize( |
| 152 | R.dimen.preview_page_footer_height); |
| 153 | |
| 154 | mPreviewArea = previewArea; |
| 155 | |
| 156 | mCloseGuard.open("destroy"); |
| 157 | |
| 158 | setHasStableIds(true); |
| 159 | |
| 160 | mState = STATE_CLOSED; |
| 161 | if (DEBUG) { |
| 162 | Log.i(LOG_TAG, "STATE_CLOSED"); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | public void onOrientationChanged() { |
| 167 | mColumnCount = mContext.getResources().getInteger( |
| 168 | R.integer.preview_page_per_row_count); |
| 169 | notifyDataSetChanged(); |
| 170 | } |
| 171 | |
| 172 | public boolean isOpened() { |
| 173 | return mState == STATE_OPENED; |
| 174 | } |
| 175 | |
| 176 | public int getFilePageCount() { |
| 177 | return mPageContentRepository.getFilePageCount(); |
| 178 | } |
| 179 | |
| 180 | public void open(ParcelFileDescriptor source, final Runnable callback) { |
| 181 | throwIfNotClosed(); |
| 182 | mState = STATE_OPENED; |
| 183 | if (DEBUG) { |
| 184 | Log.i(LOG_TAG, "STATE_OPENED"); |
| 185 | } |
| 186 | mPageContentRepository.open(source, new OpenDocumentCallback() { |
| 187 | @Override |
| 188 | public void onSuccess() { |
| 189 | notifyDataSetChanged(); |
| 190 | callback.run(); |
| 191 | } |
| 192 | |
| 193 | @Override |
| 194 | public void onFailure(int error) { |
| 195 | switch (error) { |
| 196 | case OpenDocumentCallback.ERROR_MALFORMED_PDF_FILE: { |
| 197 | mCallbacks.onMalformedPdfFile(); |
| 198 | } break; |
| 199 | |
| 200 | case OpenDocumentCallback.ERROR_SECURE_PDF_FILE: { |
| 201 | mCallbacks.onSecurePdfFile(); |
| 202 | } break; |
| 203 | } |
| 204 | } |
| 205 | }); |
| 206 | } |
| 207 | |
| 208 | public void update(PageRange[] writtenPages, PageRange[] selectedPages, |
| 209 | int documentPageCount, MediaSize mediaSize, Margins minMargins) { |
| 210 | boolean documentChanged = false; |
| 211 | boolean updatePreviewAreaAndPageSize = false; |
| 212 | boolean clearSelectedPages = false; |
| 213 | |
| 214 | // If the app does not tell how many pages are in the document we cannot |
| 215 | // optimize and ask for all pages whose count we get from the renderer. |
| 216 | if (documentPageCount == PrintDocumentInfo.PAGE_COUNT_UNKNOWN) { |
| 217 | if (writtenPages == null) { |
| 218 | // If we already requested all pages, just wait. |
| 219 | if (!Arrays.equals(ALL_PAGES_ARRAY, mRequestedPages)) { |
| 220 | mRequestedPages = ALL_PAGES_ARRAY; |
| 221 | mCallbacks.onRequestContentUpdate(); |
| 222 | } |
| 223 | return; |
| 224 | } else { |
| 225 | documentPageCount = mPageContentRepository.getFilePageCount(); |
| 226 | if (documentPageCount <= 0) { |
| 227 | return; |
| 228 | } |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | if (mDocumentPageCount != documentPageCount) { |
| 233 | mDocumentPageCount = documentPageCount; |
| 234 | documentChanged = true; |
| 235 | clearSelectedPages = true; |
| 236 | } |
| 237 | |
| 238 | if (mMediaSize == null || !mMediaSize.equals(mediaSize)) { |
| 239 | mMediaSize = mediaSize; |
| 240 | updatePreviewAreaAndPageSize = true; |
| 241 | documentChanged = true; |
| 242 | |
| 243 | clearSelectedPages = true; |
| 244 | } |
| 245 | |
| 246 | if (mMinMargins == null || !mMinMargins.equals(minMargins)) { |
| 247 | mMinMargins = minMargins; |
| 248 | updatePreviewAreaAndPageSize = true; |
| 249 | documentChanged = true; |
| 250 | |
| 251 | clearSelectedPages = true; |
| 252 | } |
| 253 | |
| 254 | if (clearSelectedPages) { |
| 255 | mSelectedPages = PageRange.ALL_PAGES_ARRAY; |
| 256 | mSelectedPageCount = documentPageCount; |
| 257 | setConfirmedPages(mSelectedPages, documentPageCount); |
| 258 | updatePreviewAreaAndPageSize = true; |
| 259 | documentChanged = true; |
| 260 | } else if (!Arrays.equals(mSelectedPages, selectedPages)) { |
| 261 | mSelectedPages = selectedPages; |
| 262 | mSelectedPageCount = PageRangeUtils.getNormalizedPageCount( |
| 263 | mSelectedPages, documentPageCount); |
| 264 | setConfirmedPages(mSelectedPages, documentPageCount); |
| 265 | updatePreviewAreaAndPageSize = true; |
| 266 | documentChanged = true; |
| 267 | } |
| 268 | |
| 269 | // If *all pages* is selected we need to convert that to absolute |
| 270 | // range as we will be checking if some pages are written or not. |
| 271 | if (writtenPages != null) { |
| 272 | // If we get all pages, this means all pages that we requested. |
| 273 | if (PageRangeUtils.isAllPages(writtenPages)) { |
| 274 | writtenPages = mRequestedPages; |
| 275 | } |
| 276 | if (!Arrays.equals(mWrittenPages, writtenPages)) { |
| 277 | // TODO: Do a surgical invalidation of only written pages changed. |
| 278 | mWrittenPages = writtenPages; |
| 279 | documentChanged = true; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | if (updatePreviewAreaAndPageSize) { |
| 284 | updatePreviewAreaPageSizeAndEmptyState(); |
| 285 | } |
| 286 | |
| 287 | if (documentChanged) { |
| 288 | notifyDataSetChanged(); |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | public void close(Runnable callback) { |
| 293 | throwIfNotOpened(); |
| 294 | mState = STATE_CLOSED; |
| 295 | if (DEBUG) { |
| 296 | Log.i(LOG_TAG, "STATE_CLOSED"); |
| 297 | } |
| 298 | mPageContentRepository.close(callback); |
| 299 | } |
| 300 | |
| 301 | @Override |
| 302 | public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { |
| 303 | View page; |
| 304 | |
| 305 | if (viewType == 0) { |
| 306 | page = mLayoutInflater.inflate(R.layout.preview_page_selected, parent, false); |
| 307 | } else { |
| 308 | page = mLayoutInflater.inflate(R.layout.preview_page, parent, false); |
| 309 | } |
| 310 | |
| 311 | return new MyViewHolder(page); |
| 312 | } |
| 313 | |
| 314 | @Override |
| 315 | public void onBindViewHolder(ViewHolder holder, int position) { |
| 316 | if (DEBUG) { |
| 317 | Log.i(LOG_TAG, "Binding holder: " + holder + " with id: " + getItemId(position) |
| 318 | + " for position: " + position); |
| 319 | } |
| 320 | |
| 321 | MyViewHolder myHolder = (MyViewHolder) holder; |
| 322 | |
| 323 | PreviewPageFrame page = (PreviewPageFrame) holder.itemView; |
| 324 | page.setOnClickListener(mPageClickListener); |
| 325 | |
| 326 | page.setTag(holder); |
| 327 | |
| 328 | myHolder.mPageInAdapter = position; |
| 329 | |
| 330 | final int pageInDocument = computePageIndexInDocument(position); |
| 331 | final int pageIndexInFile = computePageIndexInFile(pageInDocument); |
| 332 | |
| 333 | PageContentView content = (PageContentView) page.findViewById(R.id.page_content); |
| 334 | |
| 335 | LayoutParams params = content.getLayoutParams(); |
| 336 | params.width = mPageContentWidth; |
| 337 | params.height = mPageContentHeight; |
| 338 | |
| 339 | PageContentProvider provider = content.getPageContentProvider(); |
| 340 | |
| 341 | if (pageIndexInFile != INVALID_PAGE_INDEX) { |
| 342 | if (DEBUG) { |
| 343 | Log.i(LOG_TAG, "Binding provider:" |
| 344 | + " pageIndexInAdapter: " + position |
| 345 | + ", pageInDocument: " + pageInDocument |
| 346 | + ", pageIndexInFile: " + pageIndexInFile); |
| 347 | } |
| 348 | |
| 349 | provider = mPageContentRepository.acquirePageContentProvider( |
| 350 | pageIndexInFile, content); |
| 351 | mBoundPagesInAdapter.put(position, null); |
| 352 | } else { |
| 353 | onSelectedPageNotInFile(pageInDocument); |
| 354 | } |
| 355 | content.init(provider, mEmptyState, mErrorState, mMediaSize, mMinMargins); |
| 356 | |
| 357 | if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) >= 0) { |
| 358 | page.setSelected(true); |
| 359 | } else { |
| 360 | page.setSelected(false); |
| 361 | } |
| 362 | |
| 363 | page.setContentDescription(mContext.getString(R.string.page_description_template, |
| 364 | pageInDocument + 1, mDocumentPageCount)); |
| 365 | |
| 366 | TextView pageNumberView = (TextView) page.findViewById(R.id.page_number); |
| 367 | String text = mContext.getString(R.string.current_page_template, |
| 368 | pageInDocument + 1, mDocumentPageCount); |
| 369 | pageNumberView.setText(text); |
| 370 | } |
| 371 | |
| 372 | @Override |
| 373 | public int getItemCount() { |
| 374 | return mSelectedPageCount; |
| 375 | } |
| 376 | |
| 377 | @Override |
| 378 | public int getItemViewType(int position) { |
| 379 | if (mConfirmedPagesInDocument.indexOfKey(computePageIndexInDocument(position)) >= 0) { |
| 380 | return 0; |
| 381 | } else { |
| 382 | return 1; |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | @Override |
| 387 | public long getItemId(int position) { |
| 388 | return computePageIndexInDocument(position); |
| 389 | } |
| 390 | |
| 391 | @Override |
| 392 | public void onViewRecycled(ViewHolder holder) { |
| 393 | MyViewHolder myHolder = (MyViewHolder) holder; |
| 394 | PageContentView content = (PageContentView) holder.itemView |
| 395 | .findViewById(R.id.page_content); |
| 396 | recyclePageView(content, myHolder.mPageInAdapter); |
| 397 | myHolder.mPageInAdapter = INVALID_PAGE_INDEX; |
| 398 | } |
| 399 | |
| 400 | public PageRange[] getRequestedPages() { |
| 401 | return mRequestedPages; |
| 402 | } |
| 403 | |
| 404 | public PageRange[] getSelectedPages() { |
| 405 | PageRange[] selectedPages = computeSelectedPages(); |
| 406 | if (!Arrays.equals(mSelectedPages, selectedPages)) { |
| 407 | mSelectedPages = selectedPages; |
| 408 | mSelectedPageCount = PageRangeUtils.getNormalizedPageCount( |
| 409 | mSelectedPages, mDocumentPageCount); |
| 410 | updatePreviewAreaPageSizeAndEmptyState(); |
| 411 | notifyDataSetChanged(); |
| 412 | } |
| 413 | return mSelectedPages; |
| 414 | } |
| 415 | |
| 416 | public void onPreviewAreaSizeChanged() { |
| 417 | if (mMediaSize != null) { |
| 418 | updatePreviewAreaPageSizeAndEmptyState(); |
| 419 | notifyDataSetChanged(); |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | private void updatePreviewAreaPageSizeAndEmptyState() { |
| 424 | if (mMediaSize == null) { |
| 425 | return; |
| 426 | } |
| 427 | |
| 428 | final int availableWidth = mPreviewArea.getWidth(); |
| 429 | final int availableHeight = mPreviewArea.getHeight(); |
| 430 | |
| 431 | // Page aspect ratio to keep. |
| 432 | final float pageAspectRatio = (float) mMediaSize.getWidthMils() |
| 433 | / mMediaSize.getHeightMils(); |
| 434 | |
| 435 | // Make sure we have no empty columns. |
| 436 | final int columnCount = Math.min(mSelectedPageCount, mColumnCount); |
| 437 | mPreviewArea.setColumnCount(columnCount); |
| 438 | |
| 439 | // Compute max page width. |
| 440 | final int horizontalMargins = 2 * columnCount * mPreviewPageMargin; |
| 441 | final int horizontalPaddingAndMargins = horizontalMargins + 2 * mPreviewListPadding; |
| 442 | final int pageContentDesiredWidth = (int) ((((float) availableWidth |
| 443 | - horizontalPaddingAndMargins) / columnCount) + 0.5f); |
| 444 | |
| 445 | // Compute max page height. |
| 446 | final int pageContentDesiredHeight = (int) ((pageContentDesiredWidth |
| 447 | / pageAspectRatio) + 0.5f); |
| 448 | |
| 449 | // If the page does not fit entirely in a vertical direction, |
| 450 | // we shirk it but not less than the minimal page width. |
| 451 | final int pageContentMinHeight = (int) (mPreviewPageMinWidth / pageAspectRatio + 0.5f); |
| 452 | final int pageContentMaxHeight = Math.max(pageContentMinHeight, |
| 453 | availableHeight - 2 * (mPreviewListPadding + mPreviewPageMargin) - mFooterHeight); |
| 454 | |
| 455 | mPageContentHeight = Math.min(pageContentDesiredHeight, pageContentMaxHeight); |
| 456 | mPageContentWidth = (int) ((mPageContentHeight * pageAspectRatio) + 0.5f); |
| 457 | |
| 458 | final int totalContentWidth = columnCount * mPageContentWidth + horizontalMargins; |
| 459 | final int horizontalPadding = (availableWidth - totalContentWidth) / 2; |
| 460 | |
| 461 | final int rowCount = mSelectedPageCount / columnCount |
| 462 | + ((mSelectedPageCount % columnCount) > 0 ? 1 : 0); |
| 463 | final int totalContentHeight = rowCount * (mPageContentHeight + mFooterHeight + 2 |
| 464 | * mPreviewPageMargin); |
| 465 | |
| 466 | final int verticalPadding; |
| 467 | if (mPageContentHeight + mFooterHeight + mPreviewListPadding |
| 468 | + 2 * mPreviewPageMargin > availableHeight) { |
| 469 | verticalPadding = Math.max(0, |
| 470 | (availableHeight - mPageContentHeight - mFooterHeight) / 2 |
| 471 | - mPreviewPageMargin); |
| 472 | } else { |
| 473 | verticalPadding = Math.max(mPreviewListPadding, |
| 474 | (availableHeight - totalContentHeight) / 2); |
| 475 | } |
| 476 | |
| 477 | mPreviewArea.setPadding(horizontalPadding, verticalPadding, |
| 478 | horizontalPadding, verticalPadding); |
| 479 | |
| 480 | // Now update the empty state drawable, as it depends on the page |
| 481 | // size and is reused for all views for better performance. |
| 482 | LayoutInflater inflater = LayoutInflater.from(mContext); |
| 483 | View loadingContent = inflater.inflate(R.layout.preview_page_loading, null, false); |
| 484 | loadingContent.measure(MeasureSpec.makeMeasureSpec(mPageContentWidth, MeasureSpec.EXACTLY), |
| 485 | MeasureSpec.makeMeasureSpec(mPageContentHeight, MeasureSpec.EXACTLY)); |
| 486 | loadingContent.layout(0, 0, loadingContent.getMeasuredWidth(), |
| 487 | loadingContent.getMeasuredHeight()); |
| 488 | |
| 489 | // To create a bitmap, height & width should be larger than 0 |
| 490 | if (mPageContentHeight <= 0 || mPageContentWidth <= 0) { |
| 491 | Log.w(LOG_TAG, "Unable to create bitmap, height or width smaller than 0!"); |
| 492 | return; |
| 493 | } |
| 494 | |
| 495 | Bitmap loadingBitmap = Bitmap.createBitmap(mPageContentWidth, mPageContentHeight, |
| 496 | Bitmap.Config.ARGB_8888); |
| 497 | loadingContent.draw(new Canvas(loadingBitmap)); |
| 498 | |
| 499 | // Do not recycle the old bitmap if such as it may be set as an empty |
| 500 | // state to any of the page views. Just let the GC take care of it. |
| 501 | mEmptyState = new BitmapDrawable(mContext.getResources(), loadingBitmap); |
| 502 | |
| 503 | // Now update the empty state drawable, as it depends on the page |
| 504 | // size and is reused for all views for better performance. |
| 505 | View errorContent = inflater.inflate(R.layout.preview_page_error, null, false); |
| 506 | errorContent.measure(MeasureSpec.makeMeasureSpec(mPageContentWidth, MeasureSpec.EXACTLY), |
| 507 | MeasureSpec.makeMeasureSpec(mPageContentHeight, MeasureSpec.EXACTLY)); |
| 508 | errorContent.layout(0, 0, errorContent.getMeasuredWidth(), |
| 509 | errorContent.getMeasuredHeight()); |
| 510 | |
| 511 | Bitmap errorBitmap = Bitmap.createBitmap(mPageContentWidth, mPageContentHeight, |
| 512 | Bitmap.Config.ARGB_8888); |
| 513 | errorContent.draw(new Canvas(errorBitmap)); |
| 514 | |
| 515 | // Do not recycle the old bitmap if such as it may be set as an error |
| 516 | // state to any of the page views. Just let the GC take care of it. |
| 517 | mErrorState = new BitmapDrawable(mContext.getResources(), errorBitmap); |
| 518 | } |
| 519 | |
| 520 | private PageRange[] computeSelectedPages() { |
| 521 | ArrayList<PageRange> selectedPagesList = new ArrayList<>(); |
| 522 | |
| 523 | int startPageIndex = INVALID_PAGE_INDEX; |
| 524 | int endPageIndex = INVALID_PAGE_INDEX; |
| 525 | |
| 526 | final int pageCount = mConfirmedPagesInDocument.size(); |
| 527 | for (int i = 0; i < pageCount; i++) { |
| 528 | final int pageIndex = mConfirmedPagesInDocument.keyAt(i); |
| 529 | if (startPageIndex == INVALID_PAGE_INDEX) { |
| 530 | startPageIndex = endPageIndex = pageIndex; |
| 531 | } |
| 532 | if (endPageIndex + 1 < pageIndex) { |
| 533 | PageRange pageRange = new PageRange(startPageIndex, endPageIndex); |
| 534 | selectedPagesList.add(pageRange); |
| 535 | startPageIndex = pageIndex; |
| 536 | } |
| 537 | endPageIndex = pageIndex; |
| 538 | } |
| 539 | |
| 540 | if (startPageIndex != INVALID_PAGE_INDEX |
| 541 | && endPageIndex != INVALID_PAGE_INDEX) { |
| 542 | PageRange pageRange = new PageRange(startPageIndex, endPageIndex); |
| 543 | selectedPagesList.add(pageRange); |
| 544 | } |
| 545 | |
| 546 | PageRange[] selectedPages = new PageRange[selectedPagesList.size()]; |
| 547 | selectedPagesList.toArray(selectedPages); |
| 548 | |
| 549 | return selectedPages; |
| 550 | } |
| 551 | |
| 552 | public void destroy(Runnable callback) { |
| 553 | mCloseGuard.close(); |
| 554 | mState = STATE_DESTROYED; |
| 555 | if (DEBUG) { |
| 556 | Log.i(LOG_TAG, "STATE_DESTROYED"); |
| 557 | } |
| 558 | mPageContentRepository.destroy(callback); |
| 559 | } |
| 560 | |
| 561 | @Override |
| 562 | protected void finalize() throws Throwable { |
| 563 | try { |
| 564 | if (mCloseGuard != null) { |
| 565 | mCloseGuard.warnIfOpen(); |
| 566 | } |
| 567 | |
| 568 | if (mState != STATE_DESTROYED) { |
| 569 | destroy(null); |
| 570 | } |
| 571 | } finally { |
| 572 | super.finalize(); |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | private int computePageIndexInDocument(int indexInAdapter) { |
| 577 | int skippedAdapterPages = 0; |
| 578 | final int selectedPagesCount = mSelectedPages.length; |
| 579 | for (int i = 0; i < selectedPagesCount; i++) { |
| 580 | PageRange pageRange = PageRangeUtils.asAbsoluteRange( |
| 581 | mSelectedPages[i], mDocumentPageCount); |
| 582 | skippedAdapterPages += pageRange.getSize(); |
| 583 | if (skippedAdapterPages > indexInAdapter) { |
| 584 | final int overshoot = skippedAdapterPages - indexInAdapter - 1; |
| 585 | return pageRange.getEnd() - overshoot; |
| 586 | } |
| 587 | } |
| 588 | return INVALID_PAGE_INDEX; |
| 589 | } |
| 590 | |
| 591 | private int computePageIndexInFile(int pageIndexInDocument) { |
| 592 | if (!PageRangeUtils.contains(mSelectedPages, pageIndexInDocument)) { |
| 593 | return INVALID_PAGE_INDEX; |
| 594 | } |
| 595 | if (mWrittenPages == null) { |
| 596 | return INVALID_PAGE_INDEX; |
| 597 | } |
| 598 | |
| 599 | int indexInFile = INVALID_PAGE_INDEX; |
| 600 | final int rangeCount = mWrittenPages.length; |
| 601 | for (int i = 0; i < rangeCount; i++) { |
| 602 | PageRange pageRange = mWrittenPages[i]; |
| 603 | if (!pageRange.contains(pageIndexInDocument)) { |
| 604 | indexInFile += pageRange.getSize(); |
| 605 | } else { |
| 606 | indexInFile += pageIndexInDocument - pageRange.getStart() + 1; |
| 607 | return indexInFile; |
| 608 | } |
| 609 | } |
| 610 | return INVALID_PAGE_INDEX; |
| 611 | } |
| 612 | |
| 613 | private void setConfirmedPages(PageRange[] pagesInDocument, int documentPageCount) { |
| 614 | mConfirmedPagesInDocument.clear(); |
| 615 | final int rangeCount = pagesInDocument.length; |
| 616 | for (int i = 0; i < rangeCount; i++) { |
| 617 | PageRange pageRange = PageRangeUtils.asAbsoluteRange(pagesInDocument[i], |
| 618 | documentPageCount); |
| 619 | for (int j = pageRange.getStart(); j <= pageRange.getEnd(); j++) { |
| 620 | mConfirmedPagesInDocument.put(j, null); |
| 621 | } |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | private void onSelectedPageNotInFile(int pageInDocument) { |
| 626 | PageRange[] requestedPages = computeRequestedPages(pageInDocument); |
| 627 | if (!Arrays.equals(mRequestedPages, requestedPages)) { |
| 628 | mRequestedPages = requestedPages; |
| 629 | if (DEBUG) { |
| 630 | Log.i(LOG_TAG, "Requesting pages: " + Arrays.toString(mRequestedPages)); |
| 631 | } |
| 632 | |
| 633 | // This call might come from a recylerview that is currently updating. Hence delay to |
| 634 | // after the update |
| 635 | (new Handler(Looper.getMainLooper())).post(new Runnable() { |
| 636 | @Override public void run() { |
| 637 | mCallbacks.onRequestContentUpdate(); |
| 638 | } |
| 639 | }); |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | private PageRange[] computeRequestedPages(int pageInDocument) { |
| 644 | if (mRequestedPages != null && |
| 645 | PageRangeUtils.contains(mRequestedPages, pageInDocument)) { |
| 646 | return mRequestedPages; |
| 647 | } |
| 648 | |
| 649 | List<PageRange> pageRangesList = new ArrayList<>(); |
| 650 | |
| 651 | int remainingPagesToRequest = MAX_PREVIEW_PAGES_BATCH; |
| 652 | final int selectedPagesCount = mSelectedPages.length; |
| 653 | |
| 654 | // We always request the pages that are bound, i.e. shown on screen. |
| 655 | PageRange[] boundPagesInDocument = computeBoundPagesInDocument(); |
| 656 | |
| 657 | final int boundRangeCount = boundPagesInDocument.length; |
| 658 | for (int i = 0; i < boundRangeCount; i++) { |
| 659 | PageRange boundRange = boundPagesInDocument[i]; |
| 660 | pageRangesList.add(boundRange); |
| 661 | } |
| 662 | remainingPagesToRequest -= PageRangeUtils.getNormalizedPageCount( |
| 663 | boundPagesInDocument, mDocumentPageCount); |
| 664 | |
| 665 | final boolean requestFromStart = mRequestedPages == null |
| 666 | || pageInDocument > mRequestedPages[mRequestedPages.length - 1].getEnd(); |
| 667 | |
| 668 | if (!requestFromStart) { |
| 669 | if (DEBUG) { |
| 670 | Log.i(LOG_TAG, "Requesting from end"); |
| 671 | } |
| 672 | |
| 673 | // Reminder that ranges are always normalized. |
| 674 | for (int i = selectedPagesCount - 1; i >= 0; i--) { |
| 675 | if (remainingPagesToRequest <= 0) { |
| 676 | break; |
| 677 | } |
| 678 | |
| 679 | PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], |
| 680 | mDocumentPageCount); |
| 681 | if (pageInDocument < selectedRange.getStart()) { |
| 682 | continue; |
| 683 | } |
| 684 | |
| 685 | PageRange pagesInRange; |
| 686 | int rangeSpan; |
| 687 | |
| 688 | if (selectedRange.contains(pageInDocument)) { |
| 689 | rangeSpan = pageInDocument - selectedRange.getStart() + 1; |
| 690 | rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); |
| 691 | final int fromPage = Math.max(pageInDocument - rangeSpan - 1, 0); |
| 692 | rangeSpan = Math.max(rangeSpan, 0); |
| 693 | pagesInRange = new PageRange(fromPage, pageInDocument); |
| 694 | } else { |
| 695 | rangeSpan = selectedRange.getSize(); |
| 696 | rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); |
| 697 | rangeSpan = Math.max(rangeSpan, 0); |
| 698 | final int fromPage = Math.max(selectedRange.getEnd() - rangeSpan - 1, 0); |
| 699 | final int toPage = selectedRange.getEnd(); |
| 700 | pagesInRange = new PageRange(fromPage, toPage); |
| 701 | } |
| 702 | |
| 703 | pageRangesList.add(pagesInRange); |
| 704 | remainingPagesToRequest -= rangeSpan; |
| 705 | } |
| 706 | } else { |
| 707 | if (DEBUG) { |
| 708 | Log.i(LOG_TAG, "Requesting from start"); |
| 709 | } |
| 710 | |
| 711 | // Reminder that ranges are always normalized. |
| 712 | for (int i = 0; i < selectedPagesCount; i++) { |
| 713 | if (remainingPagesToRequest <= 0) { |
| 714 | break; |
| 715 | } |
| 716 | |
| 717 | PageRange selectedRange = PageRangeUtils.asAbsoluteRange(mSelectedPages[i], |
| 718 | mDocumentPageCount); |
| 719 | if (pageInDocument > selectedRange.getEnd()) { |
| 720 | continue; |
| 721 | } |
| 722 | |
| 723 | PageRange pagesInRange; |
| 724 | int rangeSpan; |
| 725 | |
| 726 | if (selectedRange.contains(pageInDocument)) { |
| 727 | rangeSpan = selectedRange.getEnd() - pageInDocument + 1; |
| 728 | rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); |
| 729 | final int toPage = Math.min(pageInDocument + rangeSpan - 1, |
| 730 | mDocumentPageCount - 1); |
| 731 | pagesInRange = new PageRange(pageInDocument, toPage); |
| 732 | } else { |
| 733 | rangeSpan = selectedRange.getSize(); |
| 734 | rangeSpan = Math.min(rangeSpan, remainingPagesToRequest); |
| 735 | final int fromPage = selectedRange.getStart(); |
| 736 | final int toPage = Math.min(selectedRange.getStart() + rangeSpan - 1, |
| 737 | mDocumentPageCount - 1); |
| 738 | pagesInRange = new PageRange(fromPage, toPage); |
| 739 | } |
| 740 | |
| 741 | if (DEBUG) { |
| 742 | Log.i(LOG_TAG, "computeRequestedPages() Adding range:" + pagesInRange); |
| 743 | } |
| 744 | pageRangesList.add(pagesInRange); |
| 745 | remainingPagesToRequest -= rangeSpan; |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | PageRange[] pageRanges = new PageRange[pageRangesList.size()]; |
| 750 | pageRangesList.toArray(pageRanges); |
| 751 | |
| 752 | return PageRangeUtils.normalize(pageRanges); |
| 753 | } |
| 754 | |
| 755 | private PageRange[] computeBoundPagesInDocument() { |
| 756 | List<PageRange> pagesInDocumentList = new ArrayList<>(); |
| 757 | |
| 758 | int fromPage = INVALID_PAGE_INDEX; |
| 759 | int toPage = INVALID_PAGE_INDEX; |
| 760 | |
| 761 | final int boundPageCount = mBoundPagesInAdapter.size(); |
| 762 | for (int i = 0; i < boundPageCount; i++) { |
| 763 | // The container is a sparse array, so keys are sorted in ascending order. |
| 764 | final int boundPageInAdapter = mBoundPagesInAdapter.keyAt(i); |
| 765 | final int boundPageInDocument = computePageIndexInDocument(boundPageInAdapter); |
| 766 | |
| 767 | if (fromPage == INVALID_PAGE_INDEX) { |
| 768 | fromPage = boundPageInDocument; |
| 769 | } |
| 770 | |
| 771 | if (toPage == INVALID_PAGE_INDEX) { |
| 772 | toPage = boundPageInDocument; |
| 773 | } |
| 774 | |
| 775 | if (boundPageInDocument > toPage + 1) { |
| 776 | PageRange pageRange = new PageRange(fromPage, toPage); |
| 777 | pagesInDocumentList.add(pageRange); |
| 778 | fromPage = toPage = boundPageInDocument; |
| 779 | } else { |
| 780 | toPage = boundPageInDocument; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | if (fromPage != INVALID_PAGE_INDEX && toPage != INVALID_PAGE_INDEX) { |
| 785 | PageRange pageRange = new PageRange(fromPage, toPage); |
| 786 | pagesInDocumentList.add(pageRange); |
| 787 | } |
| 788 | |
| 789 | PageRange[] pageInDocument = new PageRange[pagesInDocumentList.size()]; |
| 790 | pagesInDocumentList.toArray(pageInDocument); |
| 791 | |
| 792 | if (DEBUG) { |
| 793 | Log.i(LOG_TAG, "Bound pages: " + Arrays.toString(pageInDocument)); |
| 794 | } |
| 795 | |
| 796 | return pageInDocument; |
| 797 | } |
| 798 | |
| 799 | private void recyclePageView(PageContentView page, int pageIndexInAdapter) { |
| 800 | PageContentProvider provider = page.getPageContentProvider(); |
| 801 | if (provider != null) { |
| 802 | page.init(null, mEmptyState, mErrorState, mMediaSize, mMinMargins); |
| 803 | mPageContentRepository.releasePageContentProvider(provider); |
| 804 | } |
| 805 | mBoundPagesInAdapter.remove(pageIndexInAdapter); |
| 806 | page.setTag(null); |
| 807 | } |
| 808 | |
| 809 | void startPreloadContent(@NonNull PageRange visiblePagesInAdapter) { |
| 810 | int startVisibleDocument = computePageIndexInDocument(visiblePagesInAdapter.getStart()); |
| 811 | int endVisibleDocument = computePageIndexInDocument(visiblePagesInAdapter.getEnd()); |
| 812 | if (startVisibleDocument == INVALID_PAGE_INDEX |
| 813 | || endVisibleDocument == INVALID_PAGE_INDEX) { |
| 814 | return; |
| 815 | } |
| 816 | |
| 817 | mPageContentRepository.startPreload(new PageRange(startVisibleDocument, endVisibleDocument), |
| 818 | mSelectedPages, mWrittenPages); |
| 819 | } |
| 820 | |
| 821 | public void stopPreloadContent() { |
| 822 | mPageContentRepository.stopPreload(); |
| 823 | } |
| 824 | |
| 825 | private void throwIfNotOpened() { |
| 826 | if (mState != STATE_OPENED) { |
| 827 | throw new IllegalStateException("Not opened"); |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | private void throwIfNotClosed() { |
| 832 | if (mState != STATE_CLOSED) { |
| 833 | throw new IllegalStateException("Not closed"); |
| 834 | } |
| 835 | } |
| 836 | |
| 837 | private final class MyViewHolder extends ViewHolder { |
| 838 | int mPageInAdapter; |
| 839 | |
| 840 | private MyViewHolder(View itemView) { |
| 841 | super(itemView); |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | private final class PageClickListener implements OnClickListener { |
| 846 | @Override |
| 847 | public void onClick(View view) { |
| 848 | PreviewPageFrame page = (PreviewPageFrame) view; |
| 849 | MyViewHolder holder = (MyViewHolder) page.getTag(); |
| 850 | final int pageInAdapter = holder.mPageInAdapter; |
| 851 | final int pageInDocument = computePageIndexInDocument(pageInAdapter); |
| 852 | if (mConfirmedPagesInDocument.indexOfKey(pageInDocument) < 0) { |
| 853 | mConfirmedPagesInDocument.put(pageInDocument, null); |
| 854 | } else { |
| 855 | if (mConfirmedPagesInDocument.size() <= 1) { |
| 856 | return; |
| 857 | } |
| 858 | mConfirmedPagesInDocument.remove(pageInDocument); |
| 859 | } |
| 860 | |
| 861 | notifyItemChanged(pageInAdapter); |
| 862 | } |
| 863 | } |
| 864 | } |