modules/menusystem: separate activity and visibility locks

gamecore/modules/menusystem/init.lua

@@ -51,10 +51,10 @@ function MenuSystem:switchMenu(menu)
     if k == menu then
       v:getFocus()
       v:setVisibility(true)
-      v.isActive = true
+      v:setActivity(true)
     else
       v:setVisibility(false)
-      v.isActive = false
+      v:setActivity(false)
     end
   end
 end

gamecore/modules/menusystem/parent.lua

@@ -20,6 +20,7 @@ function Menu:new(menusystem, name, x, y, w, h)
   self.isVisible        = true
   self.isActive         = true
   self.isLocked         = false
+  self.isAlwaysVisible  = false
 
   self.depth        = 0
 
@@ -35,13 +36,23 @@ function Menu:setDepth(depth)
 end
 
 function Menu:setVisibility(visibility)
-  if self.isLocked == false then
+  if self.isLocked == false and self.isAlwaysVisible == false then
+    -- if the menu is locked (thus is always active), it should also
+    -- be always visible.
     self.isVisible = visibility
   else
     self.isVisible = true
   end
 end
 
+function Menu:setActivity(activity)
+  if self.isLocked == false then
+    self.isActive = activity
+  else
+    self.isActive = true
+  end
+end
+
 function Menu:getFocus()
   self.menusystem.focusedMenu = self.name
 end