michael@0: // -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
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: "use strict";
michael@0: 
michael@0: function ItemPinHelper(aUnpinnedPrefName) {
michael@0:   this._prefKey = aUnpinnedPrefName;
michael@0: }
michael@0: 
michael@0: // Cache preferences on a static variable shared
michael@0: // by all instances registered to the same pref key.
michael@0: ItemPinHelper._prefValue = {};
michael@0: 
michael@0: ItemPinHelper.prototype = {
michael@0:   _getPrefValue: function _getPrefValue() {
michael@0:     if (ItemPinHelper._prefValue[this._prefKey])
michael@0:       return ItemPinHelper._prefValue[this._prefKey];
michael@0: 
michael@0:     try {
michael@0:       // getComplexValue throws if pref never set. Really.
michael@0:       let prefValue = Services.prefs.getComplexValue(this._prefKey, Ci.nsISupportsString);
michael@0:       ItemPinHelper._prefValue[this._prefKey] = JSON.parse(prefValue.data);
michael@0:     } catch(e) {
michael@0:       ItemPinHelper._prefValue[this._prefKey] = [];
michael@0:     }
michael@0: 
michael@0:     return ItemPinHelper._prefValue[this._prefKey];
michael@0:   },
michael@0: 
michael@0:   _setPrefValue: function _setPrefValue(aNewValue) {
michael@0:     let stringified = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsString);
michael@0:     stringified.data = JSON.stringify(aNewValue);
michael@0: 
michael@0:     Services.prefs.setComplexValue(this._prefKey, Ci.nsISupportsString, stringified);
michael@0:     ItemPinHelper._prefValue[this._prefKey] = aNewValue;
michael@0:   },
michael@0: 
michael@0:   isPinned: function isPinned(aItemId) {
michael@0:     // Bookmarks are visible on StartUI (pinned) by default
michael@0:     return this._getPrefValue().indexOf(aItemId) === -1;
michael@0:   },
michael@0: 
michael@0:   setUnpinned: function setPinned(aItemId) {
michael@0:     let unpinned = this._getPrefValue();
michael@0:     unpinned.push(aItemId);
michael@0:     this._setPrefValue(unpinned);
michael@0:   },
michael@0: 
michael@0:   setPinned: function unsetPinned(aItemId) {
michael@0:     let unpinned = this._getPrefValue();
michael@0: 
michael@0:     let index = unpinned.indexOf(aItemId);
michael@0:     unpinned.splice(index, 1);
michael@0: 
michael@0:     this._setPrefValue(unpinned);
michael@0:   },
michael@0: }