7322a24ce4
After PR 9566, which removed all of the old Firefox extension code, the `FIREFOX` build flag is no longer used for anything. It thus seems to me that it should be removed, for a couple of reasons: - It's simply dead code now, which only serves to add confusion when looking at the `PDFJSDev` calls. - It used to be that `MOZCENTRAL` and `FIREFOX` was *almost* always used together. However, ever since PR 9566 there's obviously been no effort put into keeping the `FIREFOX` build flags up to date. - In the event that a new, Webextension based, Firefox addon is created in the future you'd still need to audit all `MOZCENTRAL` (and possibly `CHROME`) build flags to see what'd make sense for the addon.
107 lines
3.2 KiB
JavaScript
107 lines
3.2 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
const DEFAULT_VIEW_HISTORY_CACHE_SIZE = 20;
|
|
|
|
/**
|
|
* View History - This is a utility for saving various view parameters for
|
|
* recently opened files.
|
|
*
|
|
* The way that the view parameters are stored depends on how PDF.js is built,
|
|
* for 'gulp <flag>' the following cases exist:
|
|
* - MOZCENTRAL - uses sessionStorage.
|
|
* - GENERIC or CHROME - uses localStorage, if it is available.
|
|
*/
|
|
class ViewHistory {
|
|
constructor(fingerprint, cacheSize = DEFAULT_VIEW_HISTORY_CACHE_SIZE) {
|
|
this.fingerprint = fingerprint;
|
|
this.cacheSize = cacheSize;
|
|
|
|
this._initializedPromise = this._readFromStorage().then(databaseStr => {
|
|
const database = JSON.parse(databaseStr || "{}");
|
|
if (!("files" in database)) {
|
|
database.files = [];
|
|
} else {
|
|
while (database.files.length >= this.cacheSize) {
|
|
database.files.shift();
|
|
}
|
|
}
|
|
let index = -1;
|
|
for (let i = 0, length = database.files.length; i < length; i++) {
|
|
const branch = database.files[i];
|
|
if (branch.fingerprint === this.fingerprint) {
|
|
index = i;
|
|
break;
|
|
}
|
|
}
|
|
if (index === -1) {
|
|
index = database.files.push({ fingerprint: this.fingerprint }) - 1;
|
|
}
|
|
this.file = database.files[index];
|
|
this.database = database;
|
|
});
|
|
}
|
|
|
|
async _writeToStorage() {
|
|
const databaseStr = JSON.stringify(this.database);
|
|
|
|
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
|
|
sessionStorage.setItem("pdfjs.history", databaseStr);
|
|
return;
|
|
}
|
|
localStorage.setItem("pdfjs.history", databaseStr);
|
|
}
|
|
|
|
async _readFromStorage() {
|
|
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
|
|
return sessionStorage.getItem("pdfjs.history");
|
|
}
|
|
return localStorage.getItem("pdfjs.history");
|
|
}
|
|
|
|
async set(name, val) {
|
|
await this._initializedPromise;
|
|
this.file[name] = val;
|
|
return this._writeToStorage();
|
|
}
|
|
|
|
async setMultiple(properties) {
|
|
await this._initializedPromise;
|
|
for (const name in properties) {
|
|
this.file[name] = properties[name];
|
|
}
|
|
return this._writeToStorage();
|
|
}
|
|
|
|
async get(name, defaultValue) {
|
|
await this._initializedPromise;
|
|
const val = this.file[name];
|
|
return val !== undefined ? val : defaultValue;
|
|
}
|
|
|
|
async getMultiple(properties) {
|
|
await this._initializedPromise;
|
|
const values = Object.create(null);
|
|
|
|
for (const name in properties) {
|
|
const val = this.file[name];
|
|
values[name] = val !== undefined ? val : properties[name];
|
|
}
|
|
return values;
|
|
}
|
|
}
|
|
|
|
export { ViewHistory };
|