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117 lines
3.5 KiB
117 lines
3.5 KiB
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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/* Copyright 2012 Mozilla Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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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 PDFJS, VIEW_HISTORY_MEMORY, isLocalStorageEnabled, Promise */ |
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'use strict'; |
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/** |
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* View History - This is a utility for saving various view parameters for |
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* recently opened files. |
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* |
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* The way that the view parameters are stored depends on how PDF.js is built, |
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* for 'node make <flag>' the following cases exist: |
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* - FIREFOX or MOZCENTRAL - uses about:config. |
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* - B2G - uses asyncStorage. |
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* - GENERIC or CHROME - uses localStorage, if it is available. |
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*/ |
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var ViewHistory = (function ViewHistoryClosure() { |
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function ViewHistory(fingerprint) { |
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this.fingerprint = fingerprint; |
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var initializedPromiseResolve; |
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this.isInitializedPromiseResolved = false; |
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this.initializedPromise = new Promise(function (resolve) { |
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initializedPromiseResolve = resolve; |
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}); |
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var resolvePromise = (function ViewHistoryResolvePromise(db) { |
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this.isInitializedPromiseResolved = true; |
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this.initialize(db || '{}'); |
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initializedPromiseResolve(); |
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}).bind(this); |
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//#if B2G |
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// asyncStorage.getItem('database', resolvePromise); |
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//#endif |
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//#if FIREFOX || MOZCENTRAL |
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// resolvePromise(FirefoxCom.requestSync('getDatabase', null)); |
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//#endif |
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//#if !(FIREFOX || MOZCENTRAL || B2G) |
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if (isLocalStorageEnabled) { |
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resolvePromise(localStorage.getItem('database')); |
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} |
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//#endif |
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} |
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ViewHistory.prototype = { |
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initialize: function ViewHistory_initialize(database) { |
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database = JSON.parse(database); |
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if (!('files' in database)) { |
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database.files = []; |
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} |
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if (database.files.length >= VIEW_HISTORY_MEMORY) { |
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database.files.shift(); |
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} |
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var index; |
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for (var i = 0, length = database.files.length; i < length; i++) { |
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var branch = database.files[i]; |
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if (branch.fingerprint === this.fingerprint) { |
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index = i; |
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break; |
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} |
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} |
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if (typeof index !== 'number') { |
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index = database.files.push({fingerprint: this.fingerprint}) - 1; |
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} |
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this.file = database.files[index]; |
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this.database = database; |
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}, |
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set: function ViewHistory_set(name, val) { |
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if (!this.isInitializedPromiseResolved) { |
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return; |
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} |
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var file = this.file; |
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file[name] = val; |
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var database = JSON.stringify(this.database); |
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//#if B2G |
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// asyncStorage.setItem('database', database); |
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//#endif |
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//#if FIREFOX || MOZCENTRAL |
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// FirefoxCom.requestSync('setDatabase', database); |
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//#endif |
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//#if !(FIREFOX || MOZCENTRAL || B2G) |
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if (isLocalStorageEnabled) { |
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localStorage.setItem('database', database); |
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} |
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//#endif |
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}, |
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get: function ViewHistory_get(name, defaultValue) { |
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if (!this.isInitializedPromiseResolved) { |
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return defaultValue; |
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} |
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return this.file[name] || defaultValue; |
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} |
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}; |
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return ViewHistory; |
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})();
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