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) ->
79 | hd::tl -> hd::(remove_aux tl)
84 class single_selection_math_view_signals obj (set_selection_changed : (Gdome.element option -> unit) -> unit) =
86 inherit GMathView.math_view_signals obj
87 method selection_changed = set_selection_changed
91 class single_selection_math_view obj =
93 inherit GMathView.math_view_skel obj
94 val mutable first_selected = None
95 val mutable root_selected = None
96 val mutable selection_changed = (fun _ -> ())
98 method set_selection elem =
101 match root_selected with
103 | Some e -> self#unselect e
105 root_selected <- elem ;
109 | Some e -> self#select e
113 method get_selection = root_selected
117 single_selection_math_view_signals obj
118 (function f -> selection_changed <- f)
120 method action_toggle (elem : Gdome.element) =
121 match elem#get_namespaceURI, elem#get_localName with
124 (ns#to_string = "http://www.w3.org/1998/Math/MathML" && ln#to_string = "maction") ||
125 (ns#to_string = "http://helm.cs.unibo.it/2003/BoxML" && ln#to_string = "action")
128 let selection_attr = Gdome.domString "selection" in
130 if elem#hasAttribute ~name:selection_attr then
131 int_of_string (elem#getAttribute ~name:selection_attr)#to_string
136 (* the widget will cast the index back into a valid range *)
137 elem#setAttribute ~name:selection_attr
138 ~value:(Gdome.domString (string_of_int (selection + 1))) ;
144 match elem#get_parentNode with
148 self#action_toggle (new Gdome.element_of_node p)
150 GdomeInit.DOMCastException _ -> false
152 | None -> assert false (* every element has a parent *)
156 selection_changed <- self#set_selection ;
159 (self#connect#select_begin
160 (fun ((elem : Gdome.element option), _, _, _) ->
161 if not (same_element root_selected elem) then selection_changed elem ;
162 first_selected <- elem)) ;
165 (self#connect#select_over
166 (fun ((elem : Gdome.element option), _, _, _) ->
168 match first_selected, elem with
169 Some first', Some last' ->
171 (new Gdome.element_of_node
172 (common_ancestor (first' :> Gdome.node) (last' :> Gdome.node))))
175 if not (same_element root_selected new_selected) then
176 selection_changed new_selected)) ;
179 (self#connect#select_end
180 (fun ((elem : Gdome.element option), _, _, _) -> first_selected <- None)) ;
183 (self#connect#select_abort
185 first_selected <- None ;
186 selection_changed None)) ;
188 ignore (self#connect#click (fun _ -> self#set_selection None))
192 let single_selection_math_view ?hadjustment ?vadjustment ?font_size ?log_verbosity =
193 GtkBase.Widget.size_params ~cont:(
194 OgtkMathViewProps.pack_return
195 (fun p -> OgtkMathViewProps.set_params (new single_selection_math_view
196 (GtkMathViewProps.MathView_GMetaDOM.create p)) ~font_size ~log_verbosity)) []
199 class multi_selection_math_view_signals obj
200 (set_selection_changed : (Gdome.element option -> unit) -> unit)
203 inherit GMathView.math_view_signals obj
204 method selection_changed = set_selection_changed
208 class multi_selection_math_view obj =
210 inherit single_selection_math_view obj
211 val mutable selected : Gdome.element list = []
213 method remove_selection (elem : Gdome.element) =
214 if mem elem selected then
215 selected <- remove elem selected ;
218 method remove_selections =
220 List.iter (fun e -> self#unselect e) selected ;
223 match self#get_selection with
225 | Some e -> self#select e
229 method add_selection (elem : Gdome.element) =
230 List.iter self#unselect selected ;
231 selected <- elem::(remove_descendants_of elem selected) ;
232 List.iter self#select selected
234 method get_selections = selected
236 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;
247 | Some e -> self#select e
253 (self#connect#select_begin
254 (fun (_,_,_,state) ->
255 if not (List.mem `CONTROL (Gdk.Convert.modifier state)) then
256 self#remove_selections)) ;
259 (self#connect#select_over
260 (fun (_,_,_,state) ->
265 | `CONTROL -> "control "
269 List.iter (fun x -> print_string (c x)) (Gdk.Convert.modifier state) ;
274 (self#connect#select_end
275 (fun (_,_,_,state) ->
276 if not (List.mem `CONTROL (Gdk.Convert.modifier state)) then
277 self#remove_selections ;
278 match root_selected with
280 | Some e -> self#set_selection None ; self#add_selection e)) ;
284 (fun _ -> self#remove_selections))
288 let multi_selection_math_view ?hadjustment ?vadjustment ?font_size ?log_verbosity =
289 GtkBase.Widget.size_params ~cont:(
290 OgtkMathViewProps.pack_return
291 (fun p -> OgtkMathViewProps.set_params (new multi_selection_math_view
292 (GtkMathViewProps.MathView_GMetaDOM.create p)) ~font_size ~log_verbosity)) []