How Drawmenu work's?

[compsystems]

+1 Good program

suggestions
1: on the libMenu directory, please write a subroutine to exit the menu
2: A single argument for input as array,

PHP Code:

{
  { "name menu 1" "prg menu 1"}
  { "name menu 2" "prg menu 2"}
  { "name menu 3" "prg menu 3"}
  { "name menu 4" "prg menu 4"}
  { "name menu 5" "prg menu 5"}
  { "name menu 6" "prg menu 6"}
} 


"prg menu x" -> Path of the directory or program ([dirName.]prg([args]) ), If the sublist is empty, black menu (off)

sample

PHP Code:

{
  {"abc","tstLibM.f1()"}
  {"menu2","tstLibM.f2()"}
  {}
  {"nothing"}
  {}
 {"menu6","abs(-3)"}
} 


3: Please comment on each line, to learn how the event captures
// to manage events, trigger actions

PHP Code:

EXPORT events()
BEGIN
  IF MOUSE(1)<200 //
  THEN RETURN; 
  END;
  LOCAL m:=1+FLOOR(MOUSE(2)/53); //
  callit(a(m));
END; 


PHP Code:

callit(F)
BEGIN
  IF F=="" THEN  // If there is not program, nop
  RETURN; 
  END;
  EXPR(F); // Evaluates the program.
  draw(); // Put the menu
END;