1 (* Copyright (C) 2000-2003, Luca Padovani <luca.padovani@cs.unibo.it>,
2 * Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>.
4 * This file is part of lablgtkmathview, the Ocaml binding
5 * for the GtkMathView widget.
7 * lablgtkmathview is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * lablgtkmathview is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with lablgtkmathview; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 * For details, send a mail to the author.
24 (* finds the common node ancestor of two nodes *)
25 let common_ancestor (first : Gdome.node) (last : Gdome.node) =
27 match n#get_parentNode with
29 | Some p -> n::(path p)
33 _, hd1::tl1, hd2::tl2 when hd1#isSameNode hd2 -> (last_common ((Some hd1),tl1,tl2))
35 | _,_,_ -> assert false
37 (last_common (None,(List.rev (path first)),(List.rev (path last))))
39 let same_element (e1 : Gdome.element option) (e2 : Gdome.element option) =
42 | Some e1, Some e2 when (e1 :> Gdome.node)#isSameNode (e2 :> Gdome.node) -> true
45 (* true if n1 is n2 or one of n2's descendants *)
46 let rec descendant_of (n1 : Gdome.node) (n2 : Gdome.node) =
47 if n1#isSameNode n2 then true
49 match n1#get_parentNode with
51 | Some n1' -> descendant_of n1' n2
53 let remove_descendants_of (el : Gdome.element) =
57 | hd::tl when descendant_of (hd :> Gdome.node) (el :> Gdome.node) -> aux tl
58 | hd::tl -> hd::(aux tl)
62 (* mem el l = true if the node n is stored in the list l *)
63 let mem (el : Gdome.element) =
66 hd::_ when (hd :> Gdome.node)#isSameNode (el :> Gdome.node) -> true
72 (* remove el l = l' where l' has the same nodes as l except that all
73 * the occurrences of n have been removed *)
74 let remove (el : Gdome.element) =
77 hd::tl when (hd :> Gdome.node)#isSameNode (el :> Gdome.node) -> remove_aux tl
78 | hd::tl -> hd::(remove_aux tl)
83 class single_selection_math_view_signals obj (set_selection_changed : (Gdome.element option -> unit) -> unit) =
85 inherit GMathView.math_view_signals obj
86 method selection_changed = set_selection_changed
90 class single_selection_math_view obj =
92 inherit GMathView.math_view_skel obj
93 val mutable first_selected = None
94 val mutable root_selected = None
95 val mutable selection_changed = (fun _ -> ())
97 method set_selection elem =
99 match root_selected with
101 | Some e -> self#unselect e
103 root_selected <- elem;
106 | Some e -> self#select e
108 method get_selection = root_selected
111 new single_selection_math_view_signals obj (function f -> selection_changed <- f)
113 method action_toggle (elem : Gdome.element) =
114 match elem#get_namespaceURI, elem#get_localName with
115 Some ns, Some ln when ns#to_string = "http://www.w3.org/1998/Math/MathML" &&
116 ln#to_string = "maction" ->
118 let selection_attr = Gdome.domString "selection" in
120 if elem#hasAttribute ~name:selection_attr then
121 int_of_string (elem#getAttribute ~name:selection_attr)#to_string
126 (* the widget will cast the index back into a valid range *)
127 elem#setAttribute ~name:selection_attr ~value:(Gdome.domString (string_of_int (selection + 1))) ;
133 match elem#get_parentNode with
137 self#action_toggle (new Gdome.element_of_node p)
139 GdomeInit.DOMCastException _ -> false
141 | None -> assert false (* every element has a parent *)
146 (self#connect#select_begin
147 (fun (elem : Gdome.element option) _ ->
148 if not (same_element root_selected elem) then
150 self#set_selection elem ;
151 selection_changed elem
153 first_selected <- elem)) ;
156 (self#connect#select_over
157 (fun (elem : Gdome.element option) _ ->
159 match first_selected, elem with
160 Some first', Some last' ->
161 (Some (new Gdome.element_of_node (common_ancestor (first' :> Gdome.node) (last' :> Gdome.node))))
164 if not (same_element root_selected new_selected) then
166 self#set_selection new_selected ;
167 selection_changed new_selected
171 (self#connect#select_end
172 (fun (elem : Gdome.element option) _ -> first_selected <- None)) ;
175 (self#connect#select_abort
177 first_selected <- None ;
178 selection_changed None)) ;
180 ignore (self#connect#click (fun _ _ -> self#set_selection None))
184 let single_selection_math_view ?adjustmenth ?adjustmentv ?font_size ?font_manager ?border_width
185 ?width ?height ?packing ?show () =
187 GtkMathView.MathView.create
188 ?adjustmenth:(Gaux.may_map ~f:GData.as_adjustment adjustmenth)
189 ?adjustmentv:(Gaux.may_map ~f:GData.as_adjustment adjustmentv)
192 GtkBase.Container.set w ?border_width ?width ?height;
193 let mathview = GObj.pack_return (new single_selection_math_view w) ~packing ~show in
196 | Some size -> mathview#set_font_size size
200 match font_manager with
201 | Some manager -> mathview#set_font_manager_type ~fm_type:manager
207 class multi_selection_math_view_signals obj (set_selection_changed : (Gdome.element option -> unit) -> unit) =
209 inherit GMathView.math_view_signals obj
210 method selection_changed = set_selection_changed
214 class multi_selection_math_view obj =
216 inherit single_selection_math_view obj
217 val mutable selected : Gdome.element list = []
219 method remove_selection (elem : Gdome.element) =
220 if mem elem selected then
221 selected <- remove elem selected ;
224 method remove_selections =
225 List.iter (fun e -> self#unselect e) selected ;
227 match self#get_selection with
229 | Some e -> self#select e
231 method add_selection (elem : Gdome.element) =
232 selected <- elem::(remove_descendants_of elem selected) ;
235 method get_selections = selected
237 method set_selection elem =
239 match root_selected with
241 | Some e -> self#unselect e ; List.iter (fun e -> self#select e) selected
243 root_selected <- elem;
246 | Some e -> self#select e
250 (self#connect#select_begin
252 if not (List.mem `CONTROL (Gdk.Convert.modifier state)) then self#remove_selections)) ;
255 (self#connect#select_over
257 Printf.printf "stable selections: %d\n" (List.length selected) ;
258 Printf.printf "select_over with state: " ;
263 | `CONTROL -> "control "
267 List.iter (fun x -> print_string (c x)) (Gdk.Convert.modifier state) ;
272 (self#connect#select_end
274 Printf.printf "select_end\n" ; flush stdout ;
275 if not (List.mem `CONTROL (Gdk.Convert.modifier state)) then self#remove_selections ;
276 match root_selected with
278 | Some e -> self#set_selection None ; self#add_selection e)) ;
282 (fun _ _ -> self#remove_selections))
286 let multi_selection_math_view ?adjustmenth ?adjustmentv ?font_size ?font_manager ?border_width
287 ?width ?height ?packing ?show () =
289 GtkMathView.MathView.create
290 ?adjustmenth:(Gaux.may_map ~f:GData.as_adjustment adjustmenth)
291 ?adjustmentv:(Gaux.may_map ~f:GData.as_adjustment adjustmentv)
294 GtkBase.Container.set w ?border_width ?width ?height;
295 let mathview = GObj.pack_return (new multi_selection_math_view w) ~packing ~show in
298 | Some size -> mathview#set_font_size size
302 match font_manager with
303 | Some manager -> mathview#set_font_manager_type ~fm_type:manager