add event handler for creating and deleting markers

addons/events/CfgFunctions.hpp

@@ -82,6 +82,8 @@ class CfgFunctions {
                 description = "Raises a CBA event on the target client ID's machine.";
                 file = "\x\cba\addons\events\fnc_ownerEvent.sqf";
             };
+            PATHTO_FNC(addMarkerEventHandler);
+            PATHTO_FNC(removeMarkerEventHandler);
         };
     };
 };

addons/events/fnc_addMarkerEventHandler.sqf

@@ -0,0 +1,58 @@
+/* ----------------------------------------------------------------------------
+Function: CBA_fnc_addMarkerEventHandler
+
+Description:
+    Adds an event handler that executes code when a marker is created or deleted.
+
+Parameters:
+    _eventType - Type of event to add. Can be "created" or "deleted". <STRING>
+    _function  - Function to call when marker is created or deleted. <CODE>
+
+Returns:
+    _eventId - Unique ID. Used with 'CBA_fnc_removeMarkerEventHandler'.
+
+Examples:
+    (begin example)
+        _id = ["created", {systemChat str _this}] call CBA_fnc_addMarkerEventHandler;
+    (end)
+
+Author:
+    commy2
+---------------------------------------------------------------------------- */
+#include "script_component.hpp"
+SCRIPT(addMarkerEventHandler);
+
+params [["_eventType", "", [""]], ["_function", {}, [{}]]];
+
+if (isNil QGVAR(oldMarkers)) then {
+    GVAR(oldMarkers) = allMapMarkers;
+
+    [{
+        private _newAllMapMarkers = allMapMarkers;
+        if !(_newAllMapMarkers isEqualTo GVAR(oldMarkers)) then {
+            params ["_events"];
+
+            {
+                [QGVAR(markerDeleted), [_x]] call CBA_fnc_localEvent;
+            } forEach (GVAR(oldMarkers) - _newAllMapMarkers);
+
+            {
+                [QGVAR(markerCreated), [_x]] call CBA_fnc_localEvent;
+            } forEach (_newAllMapMarkers - GVAR(oldMarkers));
+
+            GVAR(oldMarkers) = _newAllMapMarkers;
+        };
+    }, 0] call CBA_fnc_addPerFrameHandler;
+};
+
+if (_function isEqualTo {}) exitWith {-1};
+
+switch (toLower _eventType) do {
+    case "created": {
+        [QGVAR(markerCreated), _function] call CBA_fnc_addEventHandler // return
+    };
+    case "deleted": {
+        [QGVAR(markerDeleted), _function] call CBA_fnc_addEventHandler // return
+    };
+    default {-1};
+};

addons/events/fnc_removeMarkerEventHandler.sqf

@@ -0,0 +1,36 @@
+/* ----------------------------------------------------------------------------
+Function: CBA_fnc_removeMarkerEventHandler
+
+Description:
+    Removes an event handler previously registered with 'CBA_fnc_addMarkerEventHandler'.
+
+Parameters:
+    _eventName - Type of event to remove. Can be "created" or "deleted". <STRING>
+    _eventId   - Unique ID of the event handler to remove. <NUMBER>
+
+Returns:
+    None
+
+Examples:
+    (begin example)
+        ["created", _id] call CBA_fnc_removeMarkerEventHandler;
+    (end)
+
+Author:
+    commy2
+---------------------------------------------------------------------------- */
+#include "script_component.hpp"
+SCRIPT(removeMarkerEventHandler);
+
+params [["_eventType", "", [""]], ["_eventId", -1, [0]]];
+
+switch (toLower _eventType) do {
+    case "created": {
+        [QGVAR(markerCreated), _eventId] call CBA_fnc_removeEventHandler;
+    };
+    case "deleted": {
+        [QGVAR(markerDeleted), _eventId] call CBA_fnc_removeEventHandler;
+    };
+};
+
+nil