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components
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sbFaceplateManager.js
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/** vim: ts=2 sw=2 expandtab
//
// BEGIN SONGBIRD GPL
//
// This file is part of the Songbird web player.
//
// Copyright(c) 2005-2008 POTI, Inc.
// http://songbirdnest.com
//
// This file may be licensed under the terms of of the
// GNU General Public License Version 2 (the "GPL").
//
// Software distributed under the License is distributed
// on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
// express or implied. See the GPL for the specific language
// governing rights and limitations.
//
// You should have received a copy of the GPL along with this
// program. If not, go to http://www.gnu.org/licenses/gpl.html
// or write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// END SONGBIRD GPL
//
*/
/**
* \file sbFaceplateManager.js
* \brief Manages the lifecycle of faceplate pane bindings
*/
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Ce = Components.Exception;
const URL_BINDING_DEFAULT_PANE = "chrome://songbird/content/bindings/facePlate.xml#default-pane";
const URL_BINDING_DASHBOARD_PANE = "chrome://songbird/content/bindings/facePlate.xml#playback-pane";
const DATAREMOTE_PLAYBACK = "faceplate.playing";
/**
* \class ArrayEnumerator
* \brief Wraps a js array in an nsISimpleEnumerator
*/
function ArrayEnumerator(array)
{
this.data = array;
}
ArrayEnumerator.prototype = {
index: 0,
getNext: function() {
return this.data[this.index++];
},
/**
* Gah. nsISimpleEnumerator uses hasMoreElements, but
* nsIStringEnumerator uses hasMore.
*/
hasMoreElements: function() {
if (this.index < this.data.length)
return true;
else
return false;
},
hasMore: function () {
return this.hasMoreElements();
},
QueryInterface: function(iid)
{
if (!iid.equals(Ci.nsISimpleEnumerator) &&
!iid.equals(Ci.nsIStringEnumerator) &&
!iid.equals(Ci.nsISupports))
throw Components.results.NS_ERROR_NO_INTERFACE;
return this;
}
}
/**
* \class FaceplatePane
* \brief An implementation of nsIFaceplatePane. Acts as a single
* representation the many instances of a faceplate pane.
* \sa sbIFaceplatePane
*/
function FaceplatePane(aID, aName, aBindingURL)
{
this._id = aID;
this._name = aName;
this._bindingURL = aBindingURL;
this._data = {};
this._observers = [];
}
FaceplatePane.prototype = {
_id: null,
_name: null,
_bindingURL: null,
_data: null,
_observers: null,
get id() { return this._id; },
get name() { return this._name; },
get bindingURL() { return this._bindingURL; },
/**
* \sa sbIFaceplatePane
*/
setData: function FaceplatePane_setData(aKey, aValue) {
if (!aKey) {
throw Components.results.NS_ERROR_INVALID_ARG;
}
this._data[aKey] = aValue;
this._notify(aKey);
},
getData: function FaceplatePane_getData(aKey) {
return this._data[aKey];
},
getKeys: function FaceplatePane_getKeys() {
// Copy all the data keys into an array, and then return an enumerator
return new ArrayEnumerator( [key for (key in this._data)] );
},
addObserver: function FaceplatePane_addObserver(aObserver) {
if (! (aObserver instanceof Ci.nsIObserver)) {
throw Components.results.NS_ERROR_INVALID_ARG;
}
if (this._observers.indexOf(aObserver) == -1) {
this._observers.push(aObserver);
}
},
removeObserver: function FaceplatePane_removeObserver(aObserver) {
var index = this._observers.indexOf(aObserver);
if (index > -1) {
this._observers.splice(index,1);
}
},
_notify: function FaceplatePane_notify(topic) {
var thisPane = this.QueryInterface(Ci.sbIFaceplatePane);
this._observers.forEach( function (observer) {
observer.observe(thisPane, topic, null);
});
},
QueryInterface: function(iid)
{
if (!iid.equals(Components.interfaces.sbIFaceplatePane) &&
!iid.equals(Components.interfaces.nsISupports))
throw Components.results.NS_ERROR_NO_INTERFACE;
return this;
}
}
/**
* \class FaceplateManager
* \brief Manages the lifecycle of faceplate panes
* \sa sbIFaceplateManager
*/
function FaceplateManager() {
var os = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
// We want to wait till profile-after-change to initialize
os.addObserver(this, 'songbird-library-manager-ready', false);
// We need to unhook things on shutdown
os.addObserver(this, "songbird-library-manager-before-shutdown", false);
this._listeners = [];
this._panes = {};
};
FaceplateManager.prototype = {
constructor: FaceplateManager,
_listeners: null,
_paneCount: 0,
// Map of pane IDs to sbIFaceplatePanes
_panes: null,
// Most recently shown pane ID
_defaultPaneID: null,
/**
* Initialize the faceplate manager. Called after profile load.
* Sets up the intro pane and playback dashboard pane.
*/
_init: function init() {
// Come up with some localized names for the default panes.
var strings = Cc["@mozilla.org/intl/stringbundle;1"]
.getService(Ci.nsIStringBundleService)
.createBundle("chrome://songbird/locale/songbird.properties");
var getString = function(aStringId, aDefault) {
try {
return strings.GetStringFromName(aStringId);
} catch (e) {
return aDefault;
}
}
var introName = getString("faceplate.pane.intro.name", "Intro");
var dashboardName = getString("faceplate.pane.dashboard.name", "Dashboard");
// Create the panes
this.createPane("songbird-intro", introName, URL_BINDING_DEFAULT_PANE);
this.createPane("songbird-dashboard", dashboardName, URL_BINDING_DASHBOARD_PANE);
// Set up a dataremote to show the dashboard on first playback.
var createDataRemote = new Components.Constructor(
"@songbirdnest.com/Songbird/DataRemote;1",
Components.interfaces.sbIDataRemote, "init");
this._playbackDataRemote = createDataRemote(DATAREMOTE_PLAYBACK, null);
this._playbackDataRemote.bindObserver(this, true);
},
/**
* Called on xpcom-shutdown
*/
_deinit: function deinit() {
this._listeners = null;
this._panes = null;
if (this._playbackDataRemote) {
this._playbackDataRemote.unbind();
this._playbackDataRemote = null;
}
},
/**
* \sa sbIFaceplateManager
*/
get paneCount() {
return this._paneCount;
},
createPane: function FaceplateManager_createPane(aID, aName, aBindingURL) {
if (!aID || !aName || !aBindingURL) {
throw Components.results.NS_ERROR_INVALID_ARG;
}
if (this._panes[aID]) {
throw Components.results.NS_ERROR_FAILURE;
}
var pane = new FaceplatePane(aID, aName, aBindingURL);
this._panes[aID] = pane;
this._paneCount++;
// Announce this faceplate to the world. All listening faceplate
// widgets should receive this message and then instantiate
// the requested binding
this._onCreate(pane);
return pane;
},
showPane: function FaceplateManager_showPane(aPane) {
if (!aPane || !aPane.id || !this._panes[aPane.id]) {
throw Components.results.NS_ERROR_INVALID_ARG;
}
this._defaultPaneID = aPane.id;
this._onShow(this._panes[aPane.id]);
},
destroyPane: function FaceplateManager_destroyPane(aPane) {
if (!aPane || !aPane.id || !this._panes[aPane.id]) {
throw Components.results.NS_ERROR_INVALID_ARG;
}
var pane = this._panes[aPane.id];
delete this._panes[pane.id];
this._paneCount--;
this._onDestroy(pane);
},
getPane: function FaceplateManager_getPane(aID) {
return this._panes[aID];
},
getPanes: function FaceplateManager_getPanes() {
// Copy all the faceplates into an array, and then return an enumerator
return new ArrayEnumerator( [this._panes[key] for (key in this._panes)] );
},
getDefaultPane: function FaceplateManager_getDefaultPane() {
var pane = this.getPane(this._defaultPaneID);
if (!pane) {
pane = this.getPane("songbird-intro");
}
return pane;
},
addListener: function FaceplateManager_addListener(aListener) {
if (! (aListener instanceof Ci.sbIFaceplateManagerListener)) {
throw Components.results.NS_ERROR_INVALID_ARG;
}
if (this._listeners.indexOf(aListener) == -1) {
this._listeners.push(aListener);
}
},
removeListener: function FaceplateManager_removeListener(aListener) {
var index = this._listeners.indexOf(aListener);
if (index > -1) {
this._listeners.splice(index,1);
}
},
/**
* Broadcasts a notification to create the given faceplate pane.
*/
_onCreate: function FaceplateManager__onCreate(aFaceplatePane) {
aFaceplatePane = aFaceplatePane.QueryInterface(Ci.sbIFaceplatePane);
this._listeners.forEach( function (listener) {
listener.onCreatePane(aFaceplatePane);
});
},
/**
* Broadcasts a notification to show the given faceplate pane.
*/
_onShow: function FaceplateManager__onShow(aFaceplatePane) {
aFaceplatePane = aFaceplatePane.QueryInterface(Ci.sbIFaceplatePane);
this._listeners.forEach( function (listener) {
listener.onShowPane(aFaceplatePane);
});
},
/**
* Broadcasts a notification to destory the given faceplate.
*/
_onDestroy: function FaceplateManager__onDestroy(aFaceplatePane) {
aFaceplatePane = aFaceplatePane.QueryInterface(Ci.sbIFaceplatePane);
this._listeners.forEach( function (listener) {
listener.onDestroyPane(aFaceplatePane);
});
},
/**
* Cause the playback dashboard pane to show in all
* faceplates. Called by a dataremote when playback
* starts for the first time.
*/
_showDashboardPane: function FaceplateManager__showDashboardPane() {
var pane = this.getPane("songbird-dashboard");
if (pane) {
this.showPane(pane);
} else {
dump("FaceplateManager__showDashboardPane: dashboard not found\n");
}
},
/**
* Called by dataremotes and the observer service.
*/
observe: function(subject, topic, data) {
var os = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
switch (topic) {
case "songbird-library-manager-ready":
os.removeObserver(this, "songbird-library-manager-ready");
this._init();
break;
case "songbird-library-manager-before-shutdown":
os.removeObserver(this, "songbird-library-manager-before-shutdown");
this._deinit();
break;
// When playback begins for the first time, jump
// to the playback dashboard
case DATAREMOTE_PLAYBACK:
if (this._playbackDataRemote.boolValue) {
this._playbackDataRemote.unbind();
this._playbackDataRemote = null;
this._showDashboardPane();
}
}
},
/**
* See nsISupports.idl
*/
QueryInterface: function(iid) {
if (!iid.equals(Components.interfaces.sbIFaceplateManager) &&
!iid.equals(Components.interfaces.nsIObserver) &&
!iid.equals(Components.interfaces.nsISupports))
throw Components.results.NS_ERROR_NO_INTERFACE;
return this;
}
}; // FaceplateManager.prototype
/**
* \brief XPCOM initialization code
*/
function makeGetModule(CONSTRUCTOR, CID, CLASSNAME, CONTRACTID, CATEGORIES) {
return function (comMgr, fileSpec) {
return {
registerSelf : function (compMgr, fileSpec, location, type) {
compMgr.QueryInterface(Ci.nsIComponentRegistrar);
compMgr.registerFactoryLocation(CID,
CLASSNAME,
CONTRACTID,
fileSpec,
location,
type);
if (CATEGORIES && CATEGORIES.length) {
var catman = Cc["@mozilla.org/categorymanager;1"]
.getService(Ci.nsICategoryManager);
for (var i=0; i<CATEGORIES.length; i++) {
var e = CATEGORIES[i];
catman.addCategoryEntry(e.category, e.entry, e.value,
true, true);
}
}
},
getClassObject : function (compMgr, cid, iid) {
if (!cid.equals(CID)) {
throw Cr.NS_ERROR_NO_INTERFACE;
}
if (!iid.equals(Ci.nsIFactory)) {
throw Cr.NS_ERROR_NOT_IMPLEMENTED;
}
return this._factory;
},
_factory : {
createInstance : function (outer, iid) {
if (outer != null) {
throw Cr.NS_ERROR_NO_AGGREGATION;
}
return (new CONSTRUCTOR()).QueryInterface(iid);
}
},
unregisterSelf : function (compMgr, location, type) {
compMgr.QueryInterface(Ci.nsIComponentRegistrar);
compMgr.unregisterFactoryLocation(CID, location);
if (CATEGORIES && CATEGORIES.length) {
var catman = Cc["@mozilla.org/categorymanager;1"]
.getService(Ci.nsICategoryManager);
for (var i=0; i<CATEGORIES.length; i++) {
var e = CATEGORIES[i];
catman.deleteCategoryEntry(e.category, e.entry, true);
}
}
},
canUnload : function (compMgr) {
return true;
},
QueryInterface : function (iid) {
if ( !iid.equals(Ci.nsIModule) ||
!iid.equals(Ci.nsISupports) )
throw Cr.NS_ERROR_NO_INTERFACE;
return this;
}
};
}
}
var NSGetModule = makeGetModule (
FaceplateManager,
Components.ID("{eb5c665a-bfe2-49f0-a747-cd3554e55606}"),
"Songbird Faceplate Pane Manager Service",
"@songbirdnest.com/faceplate/manager;1",
[{
category: 'app-startup',
entry: 'faceplate-pane-manager',
value: 'service,@songbirdnest.com/faceplate/manager;1'
}]);