Removed hardcoded screen width in VBox class.

src/ui/vbox.lua

@@ -20,9 +20,11 @@ local VBox = make_class(Drawable, Asset)
 -- Class methods
 ------------------------------------------------------------------------------
 
-function VBox:_init(x, y, spacing)
+function VBox:_init(x, y, w, h, spacing)
     self.x        = x ~= nil and x or 0
     self.y        = y ~= nil and y or 0
+    self.w        = w ~= nil and w or 0
+    self.h        = h ~= nil and h or 0
     self.s        = spacing ~= nil and spacing or 10
     self.elements = {}
 end
@@ -48,7 +50,7 @@ function VBox:load()
         end
 
         if v.float_right then
-            v.x = 320 - self.x - v.w
+            v.x = self.w - self.x - v.w
         else
             v.x = self.x
         end