2.3. Observers
Observers are objects that allow you to intercept events raised by other objects. They "observe" them.

You can intercept events just before they have been raised, or just after.

For each intercepted event, the observer will raise an event with the same name and the same arguments.

By using STOP EVENT inside an observer event handler, you cancel the original event.


Example

PRIVATE $hButton as Button
PRIVATE $hObserver AS Observer

PUBLIC SUB Form_Load()
  $hButton = NEW Button(ME) AS "Button"

internal Int32 FuncHook(Int32 a1, Int32 a2, Int32 a3)
{
    //Console.WriteLine("FuncHook");
    //Console.WriteLine(" - a1: " + a1); // a pointer
    //Console.WriteLine(" - a2: " + a2); // 1 when ending a map, 0 when starting a map, 0 when exiting the game
    //Console.WriteLine(" - a3: " + a3); // 0 when ending a map, 0 when starting a map, 1 when exiting the game
    switch (a2.ToString() + a3.ToString())
    {
        case "00":
            Console.WriteLine("OnMapStart");
            break;