Refactor into common/client classes for client/server support

Example for voxel/voxelmetaverse#26

index.coffee

@@ -5,21 +5,43 @@ InventoryWindow = require 'inventory-window'
 ever = require 'ever'
 
 module.exports = (game, opts) ->
-  new InventoryHotbar(game, opts)
+  if game.isClient
+    new InventoryHotbarClient game, opts
+  else
+    new InventoryHotbarCommon game, opts
 
 module.exports.pluginInfo =
   loadAfter: ['voxel-carry', 'voxel-registry']
 
-class InventoryHotbar extends EventEmitter
+class InventoryHotbarCommon extends EventEmitter
   constructor: (@game, opts) ->
     opts ?= {}
 
     @inventory = game.plugins?.get('voxel-carry')?.inventory ? opts.inventory ? throw 'voxel-inventory-hotbar requires "voxel-carry" plugin or "inventory" option set to inventory instance'
-    registry = game.plugins?.get('voxel-registry')
+    @selectedIndex = 0
+
+  enable: () ->
+
+  disable: () ->
+
+  give: (itemPile) -> @inventory.give itemPile
+  take: (itemPile) -> @inventory.take itemPile
+
+  # take some items from the pile the player is currently holding
+  takeHeld: (count=1) -> @inventory.takeAt @selectedIndex, count
+
+  # get the pile of items the player is currently holding
+  held: () ->
+    @inventory.get @selectedIndex
 
+class InventoryHotbarClient extends InventoryHotbarCommon
+  constructor: (@game, opts) ->
+    super @game, opts
+
+    registry = game.plugins?.get('voxel-registry')
     windowOpts = opts.windowOpts ? {}
     windowOpts.registry ?= registry if registry
-    windowOpts.inventory ?= @inventory 
+    windowOpts.inventory ?= @inventory
     windowOpts.inventorySize ?= opts.inventorySize ? @inventory.size()
     windowOpts.width ?= opts.width ? windowOpts.inventorySize   # default to one row
     @inventoryWindow = new InventoryWindow windowOpts
@@ -40,28 +62,25 @@ class InventoryHotbar extends EventEmitter
   enable: () ->
     @inventoryWindow.container.style.visibility = ''
 
-    @keydown = (ev) =>   # TODO: disable whem gui open?
+    @keydown = (ev) =>   # TODO: disable when gui open? (or use kb-bindings../interact)
       if '0'.charCodeAt(0) <= ev.keyCode <= '9'.charCodeAt(0)
         slot = ev.keyCode - '0'.charCodeAt(0) 
         if slot == 0
           slot = 10
         slot -= 1
-        @inventoryWindow.setSelected(slot)
+        @selectedIndex = slot
+        @inventoryWindow.setSelected(@selectedIndex)
     ever(document.body).on 'keydown', @keydown
+
+    super()
 
   disable: () ->
     @inventoryWindow.container.style.visibility = 'hidden'
     ever(document.body).removeListener 'keydown', @keydown
 
-  give: (itemPile) -> @inventory.give itemPile
-  take: (itemPile) -> @inventory.take itemPile
-
-  # take some items from the pile the player is currently holding
-  takeHeld: (count=1) -> @inventory.takeAt @inventoryWindow.selectedIndex, count
-
-  # get the pile of items the player is currently holding
-  held: () ->
-    @inventory.get @inventoryWindow.selectedIndex
+    super()
 
   refresh: () ->
     @inventoryWindow.refresh()
+
+