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|
(*************************************************************************)
(* *)
(* Objective Caml LablTk library *)
(* *)
(* Jun Furuse, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1999 Institut National de Recherche en Informatique et *)
(* en Automatique and Kyoto University. All rights reserved. *)
(* This file is distributed under the terms of the GNU Library *)
(* General Public License. *)
(* *)
(*************************************************************************)
(* $Id$ *)
open StdLabels
(* easy balloon help facility *)
open Tk
open Widget
open Protocol
open Support
(* switch -- if you do not want balloons, set false *)
let flag = ref true
let debug = ref false
(* We assume we have at most one popup label at a time *)
let topw = ref default_toplevel
and popupw = ref (Obj.magic dummy : message widget)
let configure_cursor w cursor =
(* DDDDDDDDDIIIIIIIRRRRRRRRTTTTTTTTYYYYYYY *)
Protocol.tkCommand [| TkToken (name w);
TkToken "configure";
TkToken "-cursor";
TkToken cursor |]
let put ~on: w ~ms: millisec mesg =
let t = ref None in
let cursor = ref "" in
let reset () =
begin
match !t with
Some t -> Timer.remove t
| _ -> ()
end;
(* if there is a popup label, unmap it *)
if Winfo.exists !topw && Wm.state !topw <> "withdrawn" then
begin
Wm.withdraw !topw;
if Winfo.exists w then configure_cursor w !cursor
end
and set ev =
if !flag then
t := Some (Timer.add ~ms: millisec ~callback: (fun () ->
t := None;
if !debug then
prerr_endline ("Balloon: " ^ Widget.name w);
update_idletasks();
Message.configure !popupw ~text: mesg;
raise_window !topw;
Wm.geometry_set !topw (* 9 & 8 are some kind of magic... *)
("+"^(string_of_int (ev.ev_RootX + 9))^
"+"^(string_of_int (ev.ev_RootY + 8)));
Wm.deiconify !topw;
cursor := cget w `Cursor;
configure_cursor w "hand2"))
in
List.iter [[`Leave]; [`ButtonPress]; [`ButtonRelease]; [`Destroy];
[`KeyPress]; [`KeyRelease]]
~f:(fun events -> bind w ~events ~extend:true ~action:(fun _ -> reset ()));
List.iter [[`Enter]; [`Motion]] ~f:
begin fun events ->
bind w ~events ~extend:true ~fields:[`RootX; `RootY]
~action:(fun ev -> reset (); set ev)
end
let init () =
let t = Hashtbl.create 101 in
Protocol.add_destroy_hook (fun w ->
Hashtbl.remove t w);
topw := Toplevel.create default_toplevel;
Wm.overrideredirect_set !topw true;
Wm.withdraw !topw;
popupw := Message.create !topw ~name: "balloon"
~background: (`Color "yellow") ~aspect: 300;
pack [!popupw];
bind_class "all" ~events: [`Enter] ~extend:true ~fields:[`Widget] ~action:
begin fun w ->
try Hashtbl.find t w.ev_Widget
with Not_found ->
Hashtbl'.add t ~key:w.ev_Widget ~data: ();
let x = Option.get w.ev_Widget ~name: "balloon" ~clas: "Balloon" in
if x <> "" then put ~on: w.ev_Widget ~ms: 1000 x
end
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