Converting PDFFindBar and PDFFindController to classes
This commit is contained in:
Tim van der Meij
parent
2e98f9095e
commit
dbe22475e1
5 changed files with 442 additions and 440 deletions
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@ -13,58 +13,50 @@
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* globals PDFFindBar, PDFJS, FindStates, FirefoxCom, Promise */
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/* globals PDFJS, FindStates, FirefoxCom, Promise */
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'use strict';
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/**
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* Provides a "search" or "find" functionality for the PDF.
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* Provides "search" or "find" functionality for the PDF.
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* This object actually performs the search for a given string.
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*/
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var PDFFindController = {
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startedTextExtraction: false,
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extractTextPromises: [],
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pendingFindMatches: {},
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active: false, // If active, find results will be highlighted.
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pageContents: [], // Stores the text for each page.
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pageMatches: [],
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selected: { // Currently selected match.
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pageIdx: -1,
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matchIdx: -1
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},
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offset: { // Where the find algorithm currently is in the document.
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pageIdx: null,
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matchIdx: null
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},
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resumePageIdx: null,
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state: null,
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dirtyMatch: false,
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findTimeout: null,
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pdfPageSource: null,
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integratedFind: false,
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charactersToNormalize: {
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'\u2018': '\'', // Left single quotation mark
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'\u2019': '\'', // Right single quotation mark
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'\u201A': '\'', // Single low-9 quotation mark
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'\u201B': '\'', // Single high-reversed-9 quotation mark
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'\u201C': '"', // Left double quotation mark
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'\u201D': '"', // Right double quotation mark
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'\u201E': '"', // Double low-9 quotation mark
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'\u201F': '"', // Double high-reversed-9 quotation mark
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'\u00BC': '1/4', // Vulgar fraction one quarter
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'\u00BD': '1/2', // Vulgar fraction one half
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'\u00BE': '3/4' // Vulgar fraction three quarters
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},
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initialize: function(options) {
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if (typeof PDFFindBar === 'undefined' || PDFFindBar === null) {
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throw 'PDFFindController cannot be initialized ' +
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'without a PDFFindBar instance';
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}
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this.pdfPageSource = options.pdfPageSource;
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this.integratedFind = options.integratedFind;
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var PDFFindController = (function PDFFindControllerClosure() {
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function PDFFindController(options) {
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this.startedTextExtraction = false;
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this.extractTextPromises = [];
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this.pendingFindMatches = {};
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this.active = false; // If active, find results will be highlighted.
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this.pageContents = []; // Stores the text for each page.
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this.pageMatches = [];
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this.selected = { // Currently selected match.
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pageIdx: -1,
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matchIdx: -1
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};
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this.offset = { // Where the find algorithm currently is in the document.
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pageIdx: null,
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matchIdx: null
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};
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this.resumePageIdx = null;
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this.state = null;
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this.dirtyMatch = false;
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this.findTimeout = null;
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this.pdfPageSource = options.pdfPageSource || null;
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this.integratedFind = options.integratedFind || false;
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this.charactersToNormalize = {
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'\u2018': '\'', // Left single quotation mark
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'\u2019': '\'', // Right single quotation mark
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'\u201A': '\'', // Single low-9 quotation mark
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'\u201B': '\'', // Single high-reversed-9 quotation mark
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'\u201C': '"', // Left double quotation mark
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'\u201D': '"', // Right double quotation mark
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'\u201E': '"', // Double low-9 quotation mark
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'\u201F': '"', // Double high-reversed-9 quotation mark
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'\u00BC': '1/4', // Vulgar fraction one quarter
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'\u00BD': '1/2', // Vulgar fraction one half
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'\u00BE': '3/4' // Vulgar fraction three quarters
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};
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this.findBar = options.findBar || null;
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// Compile the regular expression for text normalization once
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var replace = Object.keys(this.charactersToNormalize).join('');
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@ -85,277 +77,292 @@ var PDFFindController = {
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for (var i = 0, len = events.length; i < len; i++) {
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window.addEventListener(events[i], this.handleEvent);
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}
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},
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}
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reset: function pdfFindControllerReset() {
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this.startedTextExtraction = false;
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this.extractTextPromises = [];
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this.active = false;
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},
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PDFFindController.prototype = {
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setFindBar: function PDFFindController_setFindBar(findBar) {
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this.findBar = findBar;
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},
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normalize: function pdfFindControllerNormalize(text) {
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return text.replace(this.normalizationRegex, function (ch) {
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return PDFFindController.charactersToNormalize[ch];
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});
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},
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reset: function PDFFindController_reset() {
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this.startedTextExtraction = false;
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this.extractTextPromises = [];
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this.active = false;
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},
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calcFindMatch: function(pageIndex) {
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var pageContent = this.normalize(this.pageContents[pageIndex]);
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var query = this.normalize(this.state.query);
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var caseSensitive = this.state.caseSensitive;
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var queryLen = query.length;
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if (queryLen === 0) {
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// Do nothing: the matches should be wiped out already.
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return;
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}
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if (!caseSensitive) {
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pageContent = pageContent.toLowerCase();
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query = query.toLowerCase();
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}
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var matches = [];
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var matchIdx = -queryLen;
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while (true) {
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matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
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if (matchIdx === -1) {
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break;
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}
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matches.push(matchIdx);
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}
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this.pageMatches[pageIndex] = matches;
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this.updatePage(pageIndex);
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if (this.resumePageIdx === pageIndex) {
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this.resumePageIdx = null;
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this.nextPageMatch();
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}
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},
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extractText: function() {
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if (this.startedTextExtraction) {
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return;
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}
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this.startedTextExtraction = true;
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this.pageContents = [];
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var extractTextPromisesResolves = [];
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var numPages = this.pdfPageSource.pdfDocument.numPages;
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for (var i = 0; i < numPages; i++) {
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this.extractTextPromises.push(new Promise(function (resolve) {
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extractTextPromisesResolves.push(resolve);
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}));
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}
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var self = this;
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function extractPageText(pageIndex) {
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self.pdfPageSource.pages[pageIndex].getTextContent().then(
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function textContentResolved(textContent) {
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var textItems = textContent.items;
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var str = [];
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for (var i = 0, len = textItems.length; i < len; i++) {
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str.push(textItems[i].str);
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}
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// Store the pageContent as a string.
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self.pageContents.push(str.join(''));
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extractTextPromisesResolves[pageIndex](pageIndex);
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if ((pageIndex + 1) < self.pdfPageSource.pages.length) {
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extractPageText(pageIndex + 1);
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}
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}
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);
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}
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extractPageText(0);
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},
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handleEvent: function(e) {
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if (this.state === null || e.type !== 'findagain') {
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this.dirtyMatch = true;
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}
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this.state = e.detail;
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this.updateUIState(FindStates.FIND_PENDING);
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this.firstPagePromise.then(function() {
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this.extractText();
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clearTimeout(this.findTimeout);
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if (e.type === 'find') {
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// Only trigger the find action after 250ms of silence.
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this.findTimeout = setTimeout(this.nextMatch.bind(this), 250);
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} else {
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this.nextMatch();
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}
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}.bind(this));
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},
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updatePage: function(idx) {
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var page = this.pdfPageSource.pages[idx];
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if (this.selected.pageIdx === idx) {
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// If the page is selected, scroll the page into view, which triggers
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// rendering the page, which adds the textLayer. Once the textLayer is
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// build, it will scroll onto the selected match.
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page.scrollIntoView();
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}
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if (page.textLayer) {
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page.textLayer.updateMatches();
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}
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},
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nextMatch: function() {
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var previous = this.state.findPrevious;
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var currentPageIndex = this.pdfPageSource.page - 1;
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var numPages = this.pdfPageSource.pages.length;
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this.active = true;
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if (this.dirtyMatch) {
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// Need to recalculate the matches, reset everything.
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this.dirtyMatch = false;
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this.selected.pageIdx = this.selected.matchIdx = -1;
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this.offset.pageIdx = currentPageIndex;
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this.offset.matchIdx = null;
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this.hadMatch = false;
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this.resumePageIdx = null;
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this.pageMatches = [];
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normalize: function PDFFindController_normalize(text) {
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var self = this;
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return text.replace(this.normalizationRegex, function (ch) {
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return self.charactersToNormalize[ch];
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});
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},
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for (var i = 0; i < numPages; i++) {
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// Wipe out any previous highlighted matches.
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this.updatePage(i);
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calcFindMatch: function PDFFindController_calcFindMatch(pageIndex) {
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var pageContent = this.normalize(this.pageContents[pageIndex]);
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var query = this.normalize(this.state.query);
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var caseSensitive = this.state.caseSensitive;
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var queryLen = query.length;
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// As soon as the text is extracted start finding the matches.
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if (!(i in this.pendingFindMatches)) {
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this.pendingFindMatches[i] = true;
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this.extractTextPromises[i].then(function(pageIdx) {
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delete self.pendingFindMatches[pageIdx];
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self.calcFindMatch(pageIdx);
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});
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}
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if (queryLen === 0) {
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return; // Do nothing: the matches should be wiped out already.
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}
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}
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// If there's no query there's no point in searching.
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if (this.state.query === '') {
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this.updateUIState(FindStates.FIND_FOUND);
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return;
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}
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if (!caseSensitive) {
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pageContent = pageContent.toLowerCase();
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query = query.toLowerCase();
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}
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// If we're waiting on a page, we return since we can't do anything else.
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if (this.resumePageIdx) {
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return;
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}
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var matches = [];
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var matchIdx = -queryLen;
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while (true) {
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matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
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if (matchIdx === -1) {
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break;
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}
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matches.push(matchIdx);
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}
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this.pageMatches[pageIndex] = matches;
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this.updatePage(pageIndex);
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if (this.resumePageIdx === pageIndex) {
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this.resumePageIdx = null;
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this.nextPageMatch();
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}
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},
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var offset = this.offset;
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// If there's already a matchIdx that means we are iterating through a
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// page's matches.
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if (offset.matchIdx !== null) {
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var numPageMatches = this.pageMatches[offset.pageIdx].length;
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if ((!previous && offset.matchIdx + 1 < numPageMatches) ||
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(previous && offset.matchIdx > 0)) {
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// The simple case; we just have advance the matchIdx to select
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// the next match on the page.
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this.hadMatch = true;
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offset.matchIdx = (previous ? offset.matchIdx - 1 :
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offset.matchIdx + 1);
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this.updateMatch(true);
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extractText: function PDFFindController_extractText() {
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if (this.startedTextExtraction) {
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return;
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}
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// We went beyond the current page's matches, so we advance to
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// the next page.
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this.advanceOffsetPage(previous);
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}
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// Start searching through the page.
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this.nextPageMatch();
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},
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this.startedTextExtraction = true;
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matchesReady: function(matches) {
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var offset = this.offset;
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var numMatches = matches.length;
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var previous = this.state.findPrevious;
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if (numMatches) {
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// There were matches for the page, so initialize the matchIdx.
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this.hadMatch = true;
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offset.matchIdx = (previous ? numMatches - 1 : 0);
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this.updateMatch(true);
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return true;
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} else {
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// No matches, so attempt to search the next page.
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this.advanceOffsetPage(previous);
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if (offset.wrapped) {
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offset.matchIdx = null;
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if (!this.hadMatch) {
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// No point in wrapping, there were no matches.
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this.updateMatch(false);
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// while matches were not found, searching for a page
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// with matches should nevertheless halt.
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return true;
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this.pageContents = [];
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var extractTextPromisesResolves = [];
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var numPages = this.pdfPageSource.pdfDocument.numPages;
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for (var i = 0; i < numPages; i++) {
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this.extractTextPromises.push(new Promise(function (resolve) {
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extractTextPromisesResolves.push(resolve);
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}));
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}
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var self = this;
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function extractPageText(pageIndex) {
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self.pdfPageSource.pages[pageIndex].getTextContent().then(
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function textContentResolved(textContent) {
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var textItems = textContent.items;
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var str = [];
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for (var i = 0, len = textItems.length; i < len; i++) {
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str.push(textItems[i].str);
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}
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// Store the pageContent as a string.
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self.pageContents.push(str.join(''));
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extractTextPromisesResolves[pageIndex](pageIndex);
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if ((pageIndex + 1) < self.pdfPageSource.pages.length) {
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extractPageText(pageIndex + 1);
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}
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}
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);
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}
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extractPageText(0);
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},
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handleEvent: function PDFFindController_handleEvent(e) {
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if (this.state === null || e.type !== 'findagain') {
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this.dirtyMatch = true;
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}
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this.state = e.detail;
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this.updateUIState(FindStates.FIND_PENDING);
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this.firstPagePromise.then(function() {
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this.extractText();
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clearTimeout(this.findTimeout);
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if (e.type === 'find') {
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// Only trigger the find action after 250ms of silence.
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this.findTimeout = setTimeout(this.nextMatch.bind(this), 250);
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} else {
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this.nextMatch();
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}
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}.bind(this));
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},
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updatePage: function PDFFindController_updatePage(index) {
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var page = this.pdfPageSource.pages[index];
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if (this.selected.pageIdx === index) {
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// If the page is selected, scroll the page into view, which triggers
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// rendering the page, which adds the textLayer. Once the textLayer is
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// build, it will scroll onto the selected match.
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page.scrollIntoView();
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}
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if (page.textLayer) {
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page.textLayer.updateMatches();
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}
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},
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nextMatch: function PDFFindController_nextMatch() {
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var previous = this.state.findPrevious;
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var currentPageIndex = this.pdfPageSource.page - 1;
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var numPages = this.pdfPageSource.pages.length;
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this.active = true;
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if (this.dirtyMatch) {
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// Need to recalculate the matches, reset everything.
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this.dirtyMatch = false;
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this.selected.pageIdx = this.selected.matchIdx = -1;
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this.offset.pageIdx = currentPageIndex;
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this.offset.matchIdx = null;
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this.hadMatch = false;
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this.resumePageIdx = null;
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this.pageMatches = [];
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var self = this;
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for (var i = 0; i < numPages; i++) {
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// Wipe out any previous highlighted matches.
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this.updatePage(i);
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// As soon as the text is extracted start finding the matches.
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if (!(i in this.pendingFindMatches)) {
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this.pendingFindMatches[i] = true;
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this.extractTextPromises[i].then(function(pageIdx) {
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delete self.pendingFindMatches[pageIdx];
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self.calcFindMatch(pageIdx);
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});
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}
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}
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}
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// Matches were not found (and searching is not done).
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return false;
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}
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},
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nextPageMatch: function() {
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if (this.resumePageIdx !== null) {
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console.error('There can only be one pending page.');
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}
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do {
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var pageIdx = this.offset.pageIdx;
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var matches = this.pageMatches[pageIdx];
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if (!matches) {
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// The matches don't exist yet for processing by "matchesReady",
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// so set a resume point for when they do exist.
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this.resumePageIdx = pageIdx;
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break;
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// If there's no query there's no point in searching.
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if (this.state.query === '') {
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this.updateUIState(FindStates.FIND_FOUND);
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return;
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}
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} while (!this.matchesReady(matches));
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},
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advanceOffsetPage: function(previous) {
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var offset = this.offset;
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var numPages = this.extractTextPromises.length;
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offset.pageIdx = (previous ? offset.pageIdx - 1 : offset.pageIdx + 1);
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offset.matchIdx = null;
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if (offset.pageIdx >= numPages || offset.pageIdx < 0) {
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offset.pageIdx = (previous ? numPages - 1 : 0);
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offset.wrapped = true;
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return;
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}
|
||||
},
|
||||
|
||||
updateMatch: function(found) {
|
||||
var state = FindStates.FIND_NOTFOUND;
|
||||
var wrapped = this.offset.wrapped;
|
||||
this.offset.wrapped = false;
|
||||
if (found) {
|
||||
var previousPage = this.selected.pageIdx;
|
||||
this.selected.pageIdx = this.offset.pageIdx;
|
||||
this.selected.matchIdx = this.offset.matchIdx;
|
||||
state = (wrapped ? FindStates.FIND_WRAPPED : FindStates.FIND_FOUND);
|
||||
// Update the currently selected page to wipe out any selected matches.
|
||||
if (previousPage !== -1 && previousPage !== this.selected.pageIdx) {
|
||||
this.updatePage(previousPage);
|
||||
// If we're waiting on a page, we return since we can't do anything else.
|
||||
if (this.resumePageIdx) {
|
||||
return;
|
||||
}
|
||||
}
|
||||
this.updateUIState(state, this.state.findPrevious);
|
||||
if (this.selected.pageIdx !== -1) {
|
||||
this.updatePage(this.selected.pageIdx, true);
|
||||
}
|
||||
},
|
||||
|
||||
updateUIState: function(state, previous) {
|
||||
if (this.integratedFind) {
|
||||
FirefoxCom.request('updateFindControlState',
|
||||
{ result: state, findPrevious: previous });
|
||||
return;
|
||||
}
|
||||
PDFFindBar.updateUIState(state, previous);
|
||||
}
|
||||
};
|
||||
var offset = this.offset;
|
||||
// If there's already a matchIdx that means we are iterating through a
|
||||
// page's matches.
|
||||
if (offset.matchIdx !== null) {
|
||||
var numPageMatches = this.pageMatches[offset.pageIdx].length;
|
||||
if ((!previous && offset.matchIdx + 1 < numPageMatches) ||
|
||||
(previous && offset.matchIdx > 0)) {
|
||||
// The simple case; we just have advance the matchIdx to select
|
||||
// the next match on the page.
|
||||
this.hadMatch = true;
|
||||
offset.matchIdx = (previous ? offset.matchIdx - 1 :
|
||||
offset.matchIdx + 1);
|
||||
this.updateMatch(true);
|
||||
return;
|
||||
}
|
||||
// We went beyond the current page's matches, so we advance to
|
||||
// the next page.
|
||||
this.advanceOffsetPage(previous);
|
||||
}
|
||||
// Start searching through the page.
|
||||
this.nextPageMatch();
|
||||
},
|
||||
|
||||
matchesReady: function PDFFindController_matchesReady(matches) {
|
||||
var offset = this.offset;
|
||||
var numMatches = matches.length;
|
||||
var previous = this.state.findPrevious;
|
||||
|
||||
if (numMatches) {
|
||||
// There were matches for the page, so initialize the matchIdx.
|
||||
this.hadMatch = true;
|
||||
offset.matchIdx = (previous ? numMatches - 1 : 0);
|
||||
this.updateMatch(true);
|
||||
return true;
|
||||
} else {
|
||||
// No matches, so attempt to search the next page.
|
||||
this.advanceOffsetPage(previous);
|
||||
if (offset.wrapped) {
|
||||
offset.matchIdx = null;
|
||||
if (!this.hadMatch) {
|
||||
// No point in wrapping, there were no matches.
|
||||
this.updateMatch(false);
|
||||
// while matches were not found, searching for a page
|
||||
// with matches should nevertheless halt.
|
||||
return true;
|
||||
}
|
||||
}
|
||||
// Matches were not found (and searching is not done).
|
||||
return false;
|
||||
}
|
||||
},
|
||||
|
||||
nextPageMatch: function PDFFindController_nextPageMatch() {
|
||||
if (this.resumePageIdx !== null) {
|
||||
console.error('There can only be one pending page.');
|
||||
}
|
||||
do {
|
||||
var pageIdx = this.offset.pageIdx;
|
||||
var matches = this.pageMatches[pageIdx];
|
||||
if (!matches) {
|
||||
// The matches don't exist yet for processing by "matchesReady",
|
||||
// so set a resume point for when they do exist.
|
||||
this.resumePageIdx = pageIdx;
|
||||
break;
|
||||
}
|
||||
} while (!this.matchesReady(matches));
|
||||
},
|
||||
|
||||
advanceOffsetPage: function PDFFindController_advanceOffsetPage(previous) {
|
||||
var offset = this.offset;
|
||||
var numPages = this.extractTextPromises.length;
|
||||
offset.pageIdx = (previous ? offset.pageIdx - 1 : offset.pageIdx + 1);
|
||||
offset.matchIdx = null;
|
||||
|
||||
if (offset.pageIdx >= numPages || offset.pageIdx < 0) {
|
||||
offset.pageIdx = (previous ? numPages - 1 : 0);
|
||||
offset.wrapped = true;
|
||||
return;
|
||||
}
|
||||
},
|
||||
|
||||
updateMatch: function PDFFindController_updateMatch(found) {
|
||||
var state = FindStates.FIND_NOTFOUND;
|
||||
var wrapped = this.offset.wrapped;
|
||||
this.offset.wrapped = false;
|
||||
|
||||
if (found) {
|
||||
var previousPage = this.selected.pageIdx;
|
||||
this.selected.pageIdx = this.offset.pageIdx;
|
||||
this.selected.matchIdx = this.offset.matchIdx;
|
||||
state = (wrapped ? FindStates.FIND_WRAPPED : FindStates.FIND_FOUND);
|
||||
// Update the currently selected page to wipe out any selected matches.
|
||||
if (previousPage !== -1 && previousPage !== this.selected.pageIdx) {
|
||||
this.updatePage(previousPage);
|
||||
}
|
||||
}
|
||||
|
||||
this.updateUIState(state, this.state.findPrevious);
|
||||
if (this.selected.pageIdx !== -1) {
|
||||
this.updatePage(this.selected.pageIdx, true);
|
||||
}
|
||||
},
|
||||
|
||||
updateUIState: function PDFFindController_updateUIState(state, previous) {
|
||||
if (this.integratedFind) {
|
||||
FirefoxCom.request('updateFindControlState',
|
||||
{ result: state, findPrevious: previous });
|
||||
return;
|
||||
}
|
||||
if (this.findBar === null) {
|
||||
throw new Error('PDFFindController is not initialized with a ' +
|
||||
'PDFFindBar instance.');
|
||||
}
|
||||
this.findBar.updateUIState(state, previous);
|
||||
}
|
||||
};
|
||||
return PDFFindController;
|
||||
})();
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue