84 lines
3.2 KiB
OCaml
84 lines
3.2 KiB
OCaml
(***********************************************************************)
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(* *)
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(* MLTk, Tcl/Tk interface of OCaml *)
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(* *)
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(* Francois Rouaix, Francois Pessaux, Jun Furuse and Pierre Weis *)
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(* projet Cristal, INRIA Rocquencourt *)
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(* Jacques Garrigue, Kyoto University RIMS *)
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(* *)
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(* Copyright 2002 Institut National de Recherche en Informatique et *)
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(* en Automatique and Kyoto University. All rights reserved. *)
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(* This file is distributed under the terms of the GNU Library *)
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(* General Public License, with the special exception on linking *)
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(* described in file LICENSE found in the OCaml source tree. *)
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(* *)
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(***********************************************************************)
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open Camltk
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let debug = ref false
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let vert wid =
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let newsize = ref 0
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and pending_resize = ref false
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and last_last = ref 0.0 in
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let rec resize () =
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pending_resize := false;
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if !debug then
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(Printf.eprintf "%s Resize %d\n"
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(Widget.name wid) !newsize; flush stderr);
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Text.configure wid [TextHeight !newsize];
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()
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and check () =
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let first, last = Text.yview_get wid in
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check1 first last
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and check1 first last =
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let curheight = int_of_string (cget wid CHeight) in
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if !debug then begin
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Printf.eprintf "%s C %d %f %f\n"
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(Widget.name wid) curheight first last;
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flush stderr
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end;
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if first = 0.0 && last = 1.0 then ()
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(* Don't attempt anything if widget is not visible *)
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else if not (Winfo.viewable wid) then begin
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if !debug then
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(Printf.eprintf "%s C notviewable\n" (Widget.name wid);
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flush stderr);
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(* Try again later *)
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bind wid [[], Expose] (BindSet ([], fun _ ->
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bind wid [[], Expose] BindRemove;
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check()))
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end
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else begin
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let delta =
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if last = 0.0 then 1
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else if last = !last_last then
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(* it didn't change since our last resize ! *)
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1
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else begin
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last_last := last;
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(* never to more than double *)
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let visible = max 0.5 (last -. first) in
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max 1 (truncate (float curheight *. (1. -. visible)))
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end in
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newsize := max (curheight + delta) !newsize;
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if !debug then
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(Printf.eprintf "%s newsize: %d\n" (Widget.name wid) !newsize;
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flush stderr);
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if !pending_resize then ()
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else begin
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pending_resize := true;
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Timer.set 300 (fun () -> Frx_after.idle resize)
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end
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end
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and scroll first last =
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if !debug then
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(Printf.eprintf "%s V %f %f\n" (Widget.name wid) first last;
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flush stderr);
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if first = 0.0 && last = 1.0 then ()
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else check1 first last
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in
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scroll, check
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