add callback to touchmenu bar icon

frontend/ui/widget/touchmenu.lua

@@ -316,6 +316,9 @@ function TouchMenu:updateItems()
 end
 
 function TouchMenu:switchMenuTab(tab_num)
+	if self.tab_item_table[tab_num].callback then
+		self.tab_item_table[tab_num].callback()
+	end
 	if self.cur_tab ~= tab_num then
 		-- it's like getting a new menu everytime we switch tab!
 		self.page = 1

wtest.lua

@@ -240,6 +240,12 @@ touch_menu = TouchMenu:new{
 				callback = function()
 				end,
 			},
+		},
+		{
+			icon = "resources/icons/appbar.home.png",
+			callback = function()
+				DEBUG("hello world!")
+			end
 		}
 	},
 }