Add callbacks for area operations

api.lua

@@ -1,5 +1,23 @@
 local hudHandlers = {}
 
+
+areas.registered_on_adds = {}
+areas.registered_on_removes = {}
+areas.registered_on_moves = {}
+
+function areas:registerOnAdd(func)
+	table.insert(areas.registered_on_adds, func)
+end
+
+function areas:registerOnRemove(func)
+	table.insert(areas.registered_on_removes, func)
+end
+
+function areas:registerOnMove(func)
+	table.insert(areas.registered_on_moves, func)
+end
+
+
 --- Adds a function as a HUD handler, it will be able to add items to the Areas HUD element.
 function areas:registerHudHandler(handler)
 	table.insert(hudHandlers, handler)
@@ -141,4 +159,3 @@ function areas:canInteractInArea(pos1, pos2, name, allow_open)
 	-- intersecting areas and they are all owned by the player.
 	return true
 end
-

api.md

@@ -4,7 +4,10 @@ Areas mod API
 API list
 ---
 
- * `areas.registerHudHandler(handler)` - Registers a handler to add items to the Areas HUD.  See [HUD](#hud).
+ * `areas:registerHudHandler(handler)` - Registers a handler to add items to the Areas HUD.  See [HUD](#hud).
+ * `areas:registerOnAdd(func(owner, name, pos1, pos2, parent))`
+ * `areas:registerOnRemove(func(id))`
+ * `areas:registerOnMove(func(id, area, pos1, pos2))`
 
 
 HUD

internal.lua

@@ -86,6 +86,11 @@ function areas:add(owner, name, pos1, pos2, parent)
 		owner = owner,
 		parent = parent
 	}
+
+	for i=1, #areas.registered_on_adds do
+		areas.registered_on_adds[i](owner, name, pos1, pos2, parent)
+	end
+
 	-- Add to AreaStore
 	if self.store then
 		local sid = self.store:insert_area(pos1, pos2, tostring(id))
@@ -118,6 +123,10 @@ function areas:remove(id, recurse)
 		end
 	end
 
+	for i=1, #areas.registered_on_removes do
+		areas.registered_on_removes[i](id)
+	end
+
 	-- Remove main entry
 	self.areas[id] = nil
 
@@ -133,6 +142,11 @@ function areas:move(id, area, pos1, pos2)
 	area.pos1 = pos1
 	area.pos2 = pos2
 
+
+	for i=1, #areas.registered_on_moves do
+		areas.registered_on_moves[i](id, area, pos1, pos2)
+	end
+
 	if self.store then
 		self.store:remove_area(areas.store_ids[id])
 		local sid = self.store:insert_area(pos1, pos2, tostring(id))
@@ -282,4 +296,3 @@ function areas:isAreaOwner(id, name)
 	end
 	return false
 end
-