Merge pull request #11947 from atlantiscze/2016-01-09-PowerMonitorAlarm

Power monitor tweaks

code/modules/modular_computers/file_system/programs/_engineering.dm

@@ -6,10 +6,28 @@
 	nanomodule_path = /datum/nano_module/power_monitor/
 	program_icon_state = "power_monitor"
 	extended_desc = "This program connects to sensors around the station to provide information about electrical systems"
+	ui_header = "power_norm.gif"
 	required_access = access_engine
 	requires_ntnet = 1
 	network_destination = "power monitoring system"
 	size = 9
+	var/has_alert = 0
+
+/datum/computer_file/program/power_monitor/process_tick()
+	..()
+	var/datum/nano_module/power_monitor/NMA = NM
+	if(istype(NMA) && NMA.has_alarm())
+		if(!has_alert)
+			program_icon_state = "power_monitor_warn"
+			ui_header = "power_warn.gif"
+			update_computer_icon()
+			has_alert = 1
+	else
+		if(has_alert)
+			program_icon_state = "power_monitor"
+			ui_header = "power_norm.gif"
+			update_computer_icon()
+			has_alert = 0
 
 /datum/computer_file/program/alarm_monitor
 	filename = "alarmmonitor"

code/modules/nano/modules/power_monitor.dm

@@ -7,6 +7,13 @@
 	..()
 	refresh_sensors()
 
+// Checks whether there is an active alarm, if yes, returns 1, otherwise returns 0.
+/datum/nano_module/power_monitor/proc/has_alarm()
+	for(var/obj/machinery/power/sensor/S in grid_sensors)
+		if(S.check_grid_warning())
+			return 1
+	return 0
+
 // If PC is not null header template is loaded. Use PC.get_header_data() to get relevant nanoui data from it. All data entries begin with "PC_...."
 // In future it may be expanded to other modular computer devices.
 /datum/nano_module/power_monitor/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/topic_state/state = default_state)