(**************************************************************************)
(*                Lablgtk                                                 *)
(*                                                                        *)
(*    This program is free software; you can redistribute it              *)
(*    and/or modify it under the terms of the GNU Library General         *)
(*    Public License as published by the Free Software Foundation         *)
(*    version 2, with the exception described in file COPYING which       *)
(*    comes with the library.                                             *)
(*                                                                        *)
(*    This program is distributed in the hope that it will be useful,     *)
(*    but WITHOUT ANY WARRANTY; without even the implied warranty of      *)
(*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       *)
(*    GNU Library General Public License for more details.                *)
(*                                                                        *)
(*    You should have received a copy of the GNU Library General          *)
(*    Public License along with this program; if not, write to the        *)
(*    Free Software Foundation, Inc., 59 Temple Place, Suite 330,         *)
(*    Boston, MA 02111-1307  USA                                          *)
(*                                                                        *)
(*                                                                        *)
(**************************************************************************)
(* $Id: gtkSignal.ml 1485 2009-09-22 21:39:32Z ben_99_9 $ *)
open StdLabels
  
open Gobject
  
type id

type 'a marshaller = 'a -> Closure.argv -> unit

type ('a, 'b) t = { name : string; classe : 'a; marshaller : 'b marshaller }

type query =
  { id : int; signal_name : string; itype : string; flags : int;
    return : string; params : string array
  }

let enter_callback = ref (fun () -> ())
and exit_callback = ref (fun () -> ())
  
let stop_emit_ref = ref false
  
let stop_emit () = stop_emit_ref := true
  
type saved_state = | State of bool

let push_callback () =
  (!enter_callback ();
   let old = !stop_emit_ref in (stop_emit_ref := false; State old))
  
let pop_callback =
  function
  | State old ->
      let res = !stop_emit_ref
      in (stop_emit_ref := old; !exit_callback (); res)
  
let user_handler = ref raise
  
let safe_call ?(where = "function call") f x =
  try f x
  with
  | exn ->
      (try !user_handler exn
       with
       | exn ->
           (Printf.eprintf "In %s, uncaught exception: %s\n" where
              (Printexc.to_string exn);
            if Printexc.backtrace_status ()
            then Printexc.print_backtrace stderr
            else ();
            flush stderr))
  
external signal_new : string -> g_type -> Gobject.signal_type list -> unit =
  "ml_g_signal_new_me"
  
external query : int -> query = "ml_g_signal_query"
  
external list_ids : g_type -> int array = "ml_g_signal_list_ids"
  
external connect_by_name :
  'a obj -> name: string -> callback: g_closure -> after: bool -> id =
  "ml_g_signal_connect_closure"
  
external emit_stop_by_name : 'a obj -> name: string -> unit =
  "ml_g_signal_stop_emission_by_name"
  
external handler_block : 'a obj -> id -> unit = "ml_g_signal_handler_block"
  
external handler_unblock : 'a obj -> id -> unit =
  "ml_g_signal_handler_unblock"
  
external disconnect : 'a obj -> id -> unit = "ml_g_signal_handler_disconnect"
  
external is_connected : 'a obj -> id -> bool =
  "ml_g_signal_handler_is_connected"
  
let marshal_unit f _ = f ()
  
let marshal_int f argv =
  match Closure.get_args argv with
  | _ :: `INT n :: _ -> f n
  | _ -> invalid_arg "GtkSignal.marshal_int"
  
let marshal_string f argv =
  match Closure.get_args argv with
  | _ :: `STRING (Some s) :: _ -> f s
  | _ -> invalid_arg "GtkSignal.marshal_string"
  
let marshal1 conv1 name f argv =
  let arg1 =
    try Data.of_value conv1 (Closure.nth argv 1)
    with | _ -> failwith ("GtkSignal.marhsal1 : " ^ name)
  in f arg1
  
let marshal2 conv1 conv2 name f argv =
  let get conv pos = Data.of_value conv (Closure.nth argv ~pos) in
  let (arg1, arg2) =
    try ((get conv1 1), (get conv2 2))
    with | _ -> failwith ("GtkSignal.marhsal2 : " ^ name)
  in f arg1 arg2
  
let marshal3 conv1 conv2 conv3 name f argv =
  let get conv pos = Data.of_value conv (Closure.nth argv ~pos) in
  let (arg1, arg2, arg3) =
    try ((get conv1 1), (get conv2 2), (get conv3 3))
    with | _ -> failwith ("GtkSignal.marhsal3 : " ^ name)
  in f arg1 arg2 arg3
  
let marshal4 conv1 conv2 conv3 conv4 name f argv =
  let get conv pos = Data.of_value conv (Closure.nth argv ~pos) in
  let (arg1, arg2, arg3, arg4) =
    try ((get conv1 1), (get conv2 2), (get conv3 3), (get conv4 4))
    with | _ -> failwith ("GtkSignal.marhsal4 : " ^ name)
  in f arg1 arg2 arg3 arg4
  
let marshal5 conv1 conv2 conv3 conv4 conv5 name f argv =
  let get conv pos = Data.of_value conv (Closure.nth argv ~pos) in
  let (arg1, arg2, arg3, arg4, arg5) =
    try
      ((get conv1 1), (get conv2 2), (get conv3 3), (get conv4 4),
       (get conv5 5))
    with | _ -> failwith ("GtkSignal.marhsal5 : " ^ name)
  in f arg1 arg2 arg3 arg4 arg5
  
let marshal6 conv1 conv2 conv3 conv4 conv5 conv6 name f argv =
  let get conv pos = Data.of_value conv (Closure.nth argv ~pos) in
  let (arg1, arg2, arg3, arg4, arg5, arg6) =
    try
      ((get conv1 1), (get conv2 2), (get conv3 3), (get conv4 4),
       (get conv5 5), (get conv6 6))
    with | _ -> failwith ("GtkSignal.marhsal6 : " ^ name)
  in f arg1 arg2 arg3 arg4 arg5 arg6
  
let set_result conv argv res = Closure.set_result argv (conv.inj res)
  
let marshal0_ret ~ret f argv = set_result ret argv (f ())
  
let marshal1_ret ~ret conv1 name f argv =
  set_result ret argv (marshal1 conv1 name f argv)
  
let marshal2_ret ~ret conv1 conv2 name f argv =
  set_result ret argv (marshal2 conv1 conv2 name f argv)
  
let marshal3_ret ~ret conv1 conv2 conv3 name f argv =
  set_result ret argv (marshal3 conv1 conv2 conv3 name f argv)
  
let marshal4_ret ~ret conv1 conv2 conv3 conv4 name f argv =
  set_result ret argv (marshal4 conv1 conv2 conv3 conv4 name f argv)
  
external emit_by_name :
  'a obj -> name: string -> params: (('b data_set) array) -> g_value =
  "ml_g_signal_emit_by_name"
  
let emit_by_name_unit obj ~name ~params =
  ignore (emit_by_name obj ~name ~params)
  
let emit (obj : 'a obj) ~sgn: ((sgn : ('a, 'b) t))
         ~emitter: ((emitter : cont: ((_ data_set) array -> 'c) -> 'b))
         ~conv: ((conv : g_value -> 'c)) =
  emitter
    ~cont: (fun params -> conv (emit_by_name obj ~name: sgn.name ~params))
  
let emit_unit obj =
  emit obj ~emitter: (fun ~cont () -> cont [|  |]) ~conv: ignore ()
  
let emit_int =
  emit ~emitter: (fun ~cont n -> cont [| `INT n |]) ~conv: ignore
  
external _override_class_closure : string -> g_type -> g_closure -> unit =
  "ml_g_signal_override_class_closure"
  
let override_class_closure { name = name } t c =
  _override_class_closure name t c
  
external chain_from_overridden : Closure.argv -> unit =
  "ml_g_signal_chain_from_overridden"
  
let connect_aux ~name ~marshaller ~callback ?(after = false) (obj : 'a obj) =
  let callback argv =
    let old = push_callback ()
    in
      (safe_call (marshaller callback) argv
         ~where: ("callback for signal " ^ name);
       if pop_callback old then emit_stop_by_name obj ~name else ())
  in connect_by_name obj ~name ~callback: (Closure.create callback) ~after
  
let connect ~sgn: ((sgn : ('a, _) t)) ~callback ?after (obj : 'a obj) =
  connect_aux ~name: sgn.name ~marshaller: sgn.marshaller ~callback ?after
    obj
  
let connect_property ~prop: ((prop : ('a, _) property)) ~callback
                     (obj : 'a obj) =
  let name = "notify::" ^ prop.Gobject.name in
  let callback () = callback (get prop obj)
  in connect_aux ~name ~marshaller: marshal_unit ~callback obj
  

