undo/redo for town event timers

src/scenedit/scen.townout.cpp

@@ -828,10 +828,16 @@ void edit_town_details() {
 
 static bool save_town_events(cDialog& me, std::string, eKeyMod) {
 	if(!me.toast(true)) return true;
+	auto old_timers = town->timers;
+	bool changed = false;
 	for(int i = 0; i < town->timers.size(); i++) {
 		std::string id = std::to_string(i + 1);
 		town->timers[i].time = me["time" + id].getTextAsNum();
 		town->timers[i].node = me["spec" + id].getTextAsNum();
+		if((town->timers[i].time != old_timers[i].time) || (town->timers[i].node != old_timers[i].node)) changed = true;
+	}
+	if(changed){
+		undo_list.add(action_ptr(new aEditTownTimers(cur_town, old_timers, town->timers)));
 	}
 	return true;
 }

src/scenedit/scen.undo.cpp

@@ -960,4 +960,14 @@ bool aEditTownAdvancedDetails::undo_me() {
 bool aEditTownAdvancedDetails::redo_me() {
 	town_set_advanced(which, *scenario.towns[which], scenario, new_details);
 	return true;
+}
+
+bool aEditTownTimers::undo_me() {
+	scenario.towns[which]->timers = old_timers;
+	return true;
+}
+
+bool aEditTownTimers::redo_me() {
+	scenario.towns[which]->timers = new_timers;
+	return true;
 }

src/scenedit/scen.undo.hpp

@@ -620,4 +620,15 @@ public:
 		cAction("Edit Town Advanced Details"), which(which), old_details(old_details), new_details(new_details) {}
 };
 
+class aEditTownTimers : public cAction {
+	size_t which;
+	std::array<cTimer,8> old_timers;
+	std::array<cTimer,8> new_timers;
+	bool undo_me() override;
+	bool redo_me() override;
+public:
+	aEditTownTimers(size_t which, std::array<cTimer,8> old_timers, std::array<cTimer,8> new_timers) :
+		cAction("Edit Town Event Timers"), which(which), old_timers(old_timers), new_timers(new_timers) {}
+};
+
 #endif