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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Custom binding for the contextMenus API.
      6 
      7 var binding = require('binding').Binding.create('contextMenus');
      8 
      9 var contextMenuNatives = requireNative('context_menus');
     10 var sendRequest = require('sendRequest').sendRequest;
     11 var Event = require('event_bindings').Event;
     12 
     13 binding.registerCustomHook(function(bindingsAPI) {
     14   var apiFunctions = bindingsAPI.apiFunctions;
     15 
     16   var contextMenus = {};
     17   contextMenus.generatedIdHandlers = {};
     18   contextMenus.stringIdHandlers = {};
     19   var eventName = 'contextMenus';
     20   contextMenus.event = new Event(eventName);
     21   contextMenus.getIdFromCreateProperties = function(prop) {
     22     if (typeof(prop.id) !== 'undefined')
     23       return prop.id;
     24     return prop.generatedId;
     25   };
     26   contextMenus.handlersForId = function(id) {
     27     if (typeof(id) === 'number')
     28       return contextMenus.generatedIdHandlers;
     29     return contextMenus.stringIdHandlers;
     30   };
     31   contextMenus.ensureListenerSetup = function() {
     32     if (contextMenus.listening) {
     33       return;
     34     }
     35     contextMenus.listening = true;
     36     contextMenus.event.addListener(function() {
     37       // An extension context menu item has been clicked on - fire the onclick
     38       // if there is one.
     39       var id = arguments[0].menuItemId;
     40       var onclick = contextMenus.handlersForId(id)[id];
     41       if (onclick) {
     42         $Function.apply(onclick, null, arguments);
     43       }
     44     });
     45   };
     46 
     47   apiFunctions.setHandleRequest('create', function() {
     48     var args = arguments;
     49     var id = contextMenuNatives.GetNextContextMenuId();
     50     args[0].generatedId = id;
     51     var optArgs = {
     52       customCallback: this.customCallback,
     53     };
     54     sendRequest(this.name, args, this.definition.parameters, optArgs);
     55     return contextMenus.getIdFromCreateProperties(args[0]);
     56   });
     57 
     58   apiFunctions.setCustomCallback('create', function(name, request, response) {
     59     if (chrome.runtime.lastError) {
     60       return;
     61     }
     62 
     63     var id = contextMenus.getIdFromCreateProperties(request.args[0]);
     64 
     65     // Set up the onclick handler if we were passed one in the request.
     66     var onclick = request.args.length ? request.args[0].onclick : null;
     67     if (onclick) {
     68       contextMenus.ensureListenerSetup();
     69       contextMenus.handlersForId(id)[id] = onclick;
     70     }
     71   });
     72 
     73   apiFunctions.setCustomCallback('remove', function(name, request, response) {
     74     if (chrome.runtime.lastError) {
     75       return;
     76     }
     77     var id = request.args[0];
     78     delete contextMenus.handlersForId(id)[id];
     79   });
     80 
     81   apiFunctions.setCustomCallback('update', function(name, request, response) {
     82     if (chrome.runtime.lastError) {
     83       return;
     84     }
     85     var id = request.args[0];
     86     if (request.args[1].onclick) {
     87       contextMenus.handlersForId(id)[id] = request.args[1].onclick;
     88     }
     89   });
     90 
     91   apiFunctions.setCustomCallback('removeAll',
     92                                  function(name, request, response) {
     93     if (chrome.runtime.lastError) {
     94       return;
     95     }
     96     contextMenus.generatedIdHandlers = {};
     97     contextMenus.stringIdHandlers = {};
     98   });
     99 });
    100 
    101 exports.binding = binding.generate();
    102