Implemented ext.contextMenus for Safari

chrome/background.js

Index: chrome/background.js
===================================================================
--- a/chrome/background.js
+++ b/chrome/background.js
@@ -370,10 +370,12 @@
     handlerBehaviorChanged: chrome.webRequest.handlerBehaviorChanged
   };
 
+  var contextMenuItems = [];
+  var isContextMenuHidden = true;
   ext.contextMenus = {
-    create: function(title, contexts, onclick)
+    addMenuItem: function(title, contexts, onclick)
     {
-      chrome.contextMenus.create({
+      contextMenuItems.push({
         title: title,
         contexts: contexts,
         onclick: function(info, tab)
@@ -381,10 +383,39 @@
           onclick(info.srcUrl, new Tab(tab));
         }
       });
+      this.showMenuItems();
     },
-    removeAll: function(callback)
+    removeMenuItems: function()
     {
-      chrome.contextMenus.removeAll(callback);
+      contextMenuItems = [];
+      this.hideMenuItems();
+    },
+    showMenuItems: function()
+    {
+      if (!isContextMenuHidden)
+        return;
+
+      chrome.contextMenus.removeAll(function()
+      {
+        for (var i = 0; i < contextMenuItems.length; i++)
+        {
+          var item = contextMenuItems[i];
+          chrome.contextMenus.create({
+            title: item.title,
+            contexts: item.contexts,
+            onclick: item.onclick
+          });
+        }
+      });
+      isContextMenuHidden = false;
+    },
+    hideMenuItems: function()
+    {
+      if (isContextMenuHidden)
+        return;
+
+      chrome.contextMenus.removeAll();
+      isContextMenuHidden = true;
     }
   };
 })();