michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: let EXPORTED_SYMBOLS = ["LightweightThemeConsumer"];
michael@0: let Cc = Components.classes;
michael@0: let Ci = Components.interfaces;
michael@0: 
michael@0: Components.utils.import("resource://gre/modules/Services.jsm");
michael@0: Components.utils.import("resource://gre/modules/LightweightThemeManager.jsm");
michael@0: 
michael@0: function LightweightThemeConsumer(aDocument) {
michael@0:   this._doc = aDocument;
michael@0:   Services.obs.addObserver(this, "lightweight-theme-styling-update", false);
michael@0:   Services.obs.addObserver(this, "lightweight-theme-apply", false);
michael@0: 
michael@0:   this._update(LightweightThemeManager.currentThemeForDisplay);
michael@0: }
michael@0: 
michael@0: LightweightThemeConsumer.prototype = {
michael@0:   observe: function (aSubject, aTopic, aData) {
michael@0:     if (aTopic == "lightweight-theme-styling-update")
michael@0:       this._update(JSON.parse(aData));
michael@0:     else if (aTopic == "lightweight-theme-apply")
michael@0:       this._update(LightweightThemeManager.currentThemeForDisplay);
michael@0:   },
michael@0: 
michael@0:   destroy: function () {
michael@0:     Services.obs.removeObserver(this, "lightweight-theme-styling-update");
michael@0:     Services.obs.removeObserver(this, "lightweight-theme-apply");
michael@0:     this._doc = null;
michael@0:   },
michael@0: 
michael@0:   _update: function (aData) {
michael@0:     if (!aData)
michael@0:       aData = { headerURL: "", footerURL: "", textcolor: "", accentcolor: "" };
michael@0: 
michael@0:     let active = !!aData.headerURL;
michael@0: 
michael@0:     let msg = active ? { type: "LightweightTheme:Update", data: aData } :
michael@0:                        { type: "LightweightTheme:Disable" };
michael@0:     Services.androidBridge.handleGeckoMessage(msg);
michael@0:   }
michael@0: }