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|
(* $Id$ *)
(*
* Widgets
*)
exception IllegalWidgetType of string
(* Raised when widget command applied illegally*)
(***************************************************)
(* Widgets *)
(***************************************************)
type 'a widget =
Untyped of string
| Typed of string * string
type any
and button
and canvas
and checkbutton
and entry
and frame
and label
and listbox
and menu
and menubutton
and message
and radiobutton
and scale
and scrollbar
and text
and toplevel
let forget_type w = (Obj.magic (w : 'a widget) : any widget)
let coe = forget_type
(* table of widgets *)
let table = (Hashtbl.create 401 : (string, any widget) Hashtbl.t)
let name = function
Untyped s -> s
| Typed (s,_) -> s
(* Normally all widgets are known *)
(* this is a provision for send commands to external tk processes *)
let known_class = function
Untyped _ -> "unknown"
| Typed (_,c) -> c
(* This one is always created by opentk *)
let default_toplevel =
let wname = "." in
let w = Typed (wname, "toplevel") in
Hashtbl.add table key:wname data:w;
w
(* Dummy widget to which global callbacks are associated *)
(* also passed around by camltotkoption when no widget in context *)
let dummy =
Untyped "dummy"
let remove w =
Hashtbl.remove table key:(name w)
(* Retype widgets returned from Tk *)
(* JPF report: sometime s is "", see Protocol.cTKtoCAMLwidget *)
let get_atom s =
try
Hashtbl.find table key:s
with
Not_found -> Untyped s
let naming_scheme = [
"button", "b";
"canvas", "ca";
"checkbutton", "cb";
"entry", "en";
"frame", "f";
"label", "l";
"listbox", "li";
"menu", "me";
"menubutton", "mb";
"message", "ms";
"radiobutton", "rb";
"scale", "sc";
"scrollbar", "sb";
"text", "t";
"toplevel", "top" ]
let widget_any_table = List.map fun:fst naming_scheme
(* subtypes *)
let widget_button_table = [ "button" ]
and widget_canvas_table = [ "canvas" ]
and widget_checkbutton_table = [ "checkbutton" ]
and widget_entry_table = [ "entry" ]
and widget_frame_table = [ "frame" ]
and widget_label_table = [ "label" ]
and widget_listbox_table = [ "listbox" ]
and widget_menu_table = [ "menu" ]
and widget_menubutton_table = [ "menubutton" ]
and widget_message_table = [ "message" ]
and widget_radiobutton_table = [ "radiobutton" ]
and widget_scale_table = [ "scale" ]
and widget_scrollbar_table = [ "scrollbar" ]
and widget_text_table = [ "text" ]
and widget_toplevel_table = [ "toplevel" ]
let new_suffix clas n =
try
(List.assoc key:clas naming_scheme) ^ (string_of_int n)
with
Not_found -> "w" ^ (string_of_int n)
(* The function called by generic creation *)
let counter = ref 0
let new_atom :parent ?name:nom clas =
let parentpath = name parent in
let path =
match nom with
None ->
incr counter;
if parentpath = "."
then "." ^ (new_suffix clas !counter)
else parentpath ^ "." ^ (new_suffix clas !counter)
| Some name ->
if parentpath = "."
then "." ^ (new_suffix clas !counter)
else parentpath ^ "." ^ name
in
let w = Typed(path,clas) in
Hashtbl.add table key:path data:w;
w
(* Just create a path. Only to check existence of widgets *)
(* Use with care *)
let atom :parent name:pathcomp =
let parentpath = name parent in
let path =
if parentpath = "."
then "." ^ pathcomp
else parentpath ^ "." ^ pathcomp in
Untyped path
(* Redundant with subtyping of Widget, backward compatibility *)
let check_class w clas =
match w with
Untyped _ -> () (* assume run-time check by tk*)
| Typed(_,c) ->
if List.mem clas elt:c then ()
else raise (IllegalWidgetType c)
(* Checking membership of constructor in subtype table *)
let chk_sub errname table c =
if List.mem table elt:c then ()
else raise (Invalid_argument errname)
|
