106 lines
2.8 KiB
JavaScript
106 lines
2.8 KiB
JavaScript
|
var EXPORTED_SYMBOLS = ["PdfJs"];
|
||
|
|
|
||
|
|
const Cc = Components.classes;
|
||
|
|
const Ci = Components.interfaces;
|
||
|
|
const Cr = Components.results;
|
||
|
|
const Cm = Components.manager;
|
||
|
|
const Cu = Components.utils;
|
||
|
|
|
||
|
|
const PREF_PREFIX = 'pdfjs';
|
||
|
|
const PREF_ENABLED = PREF_PREFIX + '.enabled';
|
||
|
|
const PDFJS_HANDLER_CHANGED = 'pdfjs:handlerChanged';
|
||
|
|
|
||
|
|
Cu.import('resource://gre/modules/Services.jsm');
|
||
|
|
Cu.import('resource://pdf.js.components/PdfStreamConverter.js');
|
||
|
|
|
||
|
|
let mimeService = Cc["@mozilla.org/mime;1"]
|
||
|
|
.getService(Ci.nsIMIMEService);
|
||
|
|
|
||
|
|
function getBoolPref(pref, def) {
|
||
|
|
try {
|
||
|
|
return Services.prefs.getBoolPref(pref);
|
||
|
|
} catch (ex) {
|
||
|
|
return def;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Register/unregister a class as a component.
|
||
|
|
let Factory = {
|
||
|
|
registrar: null,
|
||
|
|
aClass: null,
|
||
|
|
register: function(aClass) {
|
||
|
|
if (this.aClass) {
|
||
|
|
dump('Cannot register more than one class');
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
this.registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
|
||
|
|
this.aClass = aClass;
|
||
|
|
var proto = aClass.prototype;
|
||
|
|
this.registrar.registerFactory(proto.classID, proto.classDescription,
|
||
|
|
proto.contractID, this);
|
||
|
|
},
|
||
|
|
unregister: function() {
|
||
|
|
if (!this.aClass) {
|
||
|
|
dump('Class was never registered.');
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
var proto = this.aClass.prototype;
|
||
|
|
this.registrar.unregisterFactory(proto.classID, this);
|
||
|
|
this.aClass = null;
|
||
|
|
},
|
||
|
|
// nsIFactory::createInstance
|
||
|
|
createInstance: function(outer, iid) {
|
||
|
|
if (outer !== null)
|
||
|
|
throw Cr.NS_ERROR_NO_AGGREGATION;
|
||
|
|
return (new (this.aClass)).QueryInterface(iid);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
let PdfJs = {
|
||
|
|
_registered: false,
|
||
|
|
init: function() {
|
||
|
|
if (this.enabled)
|
||
|
|
this._register();
|
||
|
|
else
|
||
|
|
this._unregister();
|
||
|
|
|
||
|
|
// Listen for when pdf.js is completely disabled or a different pdf handler
|
||
|
|
// is chosen.
|
||
|
|
Services.prefs.addObserver(PREF_ENABLED, this, false);
|
||
|
|
Services.obs.addObserver(this, PDFJS_HANDLER_CHANGED, false);
|
||
|
|
},
|
||
|
|
observe: function(subject, topic, data) {
|
||
|
|
if (topic != 'nsPref:changed' && topic != PDFJS_HANDLER_CHANGED)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (this.enabled)
|
||
|
|
this._register();
|
||
|
|
else
|
||
|
|
this._unregister();
|
||
|
|
},
|
||
|
|
// pdf.js is only enabled if we're both selected as the pdf viewer and if the
|
||
|
|
// global switch enabling us is true.
|
||
|
|
get enabled() {
|
||
|
|
var handlerInfo = mimeService.
|
||
|
|
getFromTypeAndExtension('application/pdf', 'pdf');
|
||
|
|
|
||
|
|
var selectedAsHandler = handlerInfo && (handlerInfo.alwaysAskBeforeHandling == false &&
|
||
|
|
handlerInfo.preferredAction == Ci.nsIHandlerInfo.handleInternally);
|
||
|
|
return getBoolPref(PREF_ENABLED, false) && selectedAsHandler;
|
||
|
|
},
|
||
|
|
_register: function() {
|
||
|
|
if (this._registered)
|
||
|
|
return;
|
||
|
|
|
||
|
|
Factory.register(PdfStreamConverter);
|
||
|
|
this._registered = true;
|
||
|
|
},
|
||
|
|
_unregister: function() {
|
||
|
|
if (!this._registered)
|
||
|
|
return;
|
||
|
|
|
||
|
|
Factory.unregister();
|
||
|
|
this._registered = false;
|
||
|
|
}
|
||
|
|
};
|