modules/menus:add a basic depth system to the menus

Fix #2

examples/test_menus/init.lua

@@ -90,6 +90,13 @@ function TestScene:new()
   MenuType(self.menusystem, "text_menu5", x, y, w, h, 8)
   MenuType(self.menusystem, "text_menu6", x, y, w, h, 8)
 
+  self.menusystem.menus["text_menu1"]:setDepth(-1)
+  self.menusystem.menus["text_menu2"]:setDepth(-1)
+  self.menusystem.menus["text_menu3"]:setDepth(-1)
+  self.menusystem.menus["text_menu4"]:setDepth(-1)
+  self.menusystem.menus["text_menu5"]:setDepth(-1)
+  self.menusystem.menus["text_menu6"]:setDepth(-1)
+
   self:addTextWidget("text_menu1", 4)
   self:addTextWidget("text_menu2", 10)
   self:addTextWidget("text_menu3", 5)

gamecore/modules/menusystem/init.lua

@@ -106,10 +106,26 @@ function MenuSystem:mousepressed( x, y, button, istouch )
   end
 end
 
-function MenuSystem:draw(dt) -- On dessine les entitées
+function MenuSystem:getDrawList()
+  local drawList = {}
   for k,v in pairs(self.menus) do
-    if (v.isVisible) then
-      v:draw(dt)
+    local drawObject = {}
+    drawObject.name   = k
+    drawObject.depth  = v.depth
+    table.insert(drawList, drawObject)
+  end
+  table.sort(drawList, function(a,b) return a.depth > b.depth end)
+
+  return drawList
+end
+
+function MenuSystem:draw(dt) -- On dessine les entitées
+  self.drawList = self:getDrawList()
+
+  for i,v in ipairs(self.drawList) do
+    local v2 = self.menus[v.name]
+    if (v2.isVisible) then
+      v2:draw(dt)
     end
   end
 

gamecore/modules/menusystem/parent.lua

@@ -21,6 +21,8 @@ function Menu:new(menusystem, name, x, y, w, h)
   self.isActive     = true
   self.isLocked     = false
 
+  self.depth        = 0
+
   self.sound = {}
   self.sound.asset = nil
   self.sound.active = false
@@ -28,6 +30,10 @@ function Menu:new(menusystem, name, x, y, w, h)
   self:register()
 end
 
+function Menu:setDepth(depth)
+  self.depth = depth or 0
+end
+
 function Menu:setVisibility(visibility)
   if self.isLocked == false then
     self.isVisible = visibility