both open all and open selected are now fast, also fixed a bug with onebag and maybe other inventory addons where items wouldn't be grayed out right when locked

control.lua

@@ -0,0 +1,143 @@
+Postal.control = {}
+
+local event_listeners = {}
+local update_listeners = {}
+
+function Postal.control.on_event()
+	for listener, _ in pairs(event_listeners) do
+		if event == listener.event and not listener.deleted then
+			listener.action()
+		end
+	end
+end
+
+function Postal.control.on_update()
+	event_listeners = Postal.util.set_filter(event_listeners, function(l) return not l.deleted end)
+	update_listeners = Postal.util.set_filter(update_listeners, function(l) return not l.deleted end)
+	
+	for listener, _ in pairs(update_listeners) do
+		if not listener.deleted then
+			listener.action()
+		end
+	end
+end
+
+
+
+function Postal.control.event_listener(event, action)
+	local self = {}
+	
+	local listener = { event=event, action=action }
+	
+	function self.set_action(action)
+		listener.action = action
+	end
+	
+	function self.start()
+		Postal.util.set_add(event_listeners, listener)
+		if not Postal.util.any(event_listeners, function(l) return l.event == event end) then
+			PostalControlFrame:RegisterEvent(event)
+		end
+		return self
+	end
+	
+	function self.stop()
+		listener.deleted = true
+		if not Postal.util.any(event_listeners, function(l) return l.event == event end) then
+			PostalControlFrame:UnregisterEvent(event)
+		end
+		return self
+	end
+	
+	return self
+end
+
+function Postal.control.update_listener(action)
+	local self = {}
+	
+	local listener = { action=action }
+
+	function self.set_action(action)
+		listener.action = action
+	end
+	
+	function self.start()
+		Postal.util.set_add(update_listeners, listener)
+		return self
+	end
+	
+	function self.stop()
+		listener.deleted = true
+		return self
+	end
+	
+	return self
+end
+
+	
+
+function Postal.control.on_next_update(callback)
+	local listener = Postal.control.update_listener()
+	
+	listener.set_action(function()
+		listener:stop()
+		return callback()
+	end)
+	
+	listener.start()
+end
+
+function Postal.control.on_next_event(event, callback)
+	local listener = Postal.control.event_listener(event)
+	
+	listener.set_action(function()
+		listener:stop()
+		return callback()
+	end)
+	
+	listener.start()
+end
+
+function Postal.control.as_soon_as(p, callback)
+	local listener = Postal.control.update_listener()	
+	
+	listener.set_action(function()
+		if p() then
+			listener.stop()
+			return callback()
+		end
+	end)
+	
+	listener.start()
+end
+
+
+
+function Postal.control.controller()
+	local self = {}
+	
+	local state
+	
+	local listener = Postal.control.update_listener()
+	listener.set_action(function()
+		if state and state.p() then
+			local k = state.k
+			state = nil
+			return k()
+		end
+	end)
+	listener.start()
+	
+	function self.wait(p, k)
+		state = {
+			k = k,
+			p = p,
+		}
+	end
+	
+	function self.cleanup()
+		listener.stop()
+	end
+	
+	return self
+end