X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2FmatitaMathView.ml;h=1d636ef8b88e7e63865f9b7cb45d59a7b5273cd7;hb=fb3ae649cf1079117166318809ac5a2dba987dcd;hp=8f477bd60278cb869803cf45d8dd5cf577379515;hpb=d3f5be46ea4f2cee636e2e64c36a82f0dd5f51a9;p=helm.git

diff --git a/matita/matitaMathView.ml b/matita/matitaMathView.ml
index 8f477bd60..1d636ef8b 100644
--- a/matita/matitaMathView.ml
+++ b/matita/matitaMathView.ml
@@ -154,6 +154,15 @@ type selected_term =
   | SelTerm of Cic.term * string option (* term, parent hypothesis (if any) *)
   | SelHyp of string * Cic.context (* hypothesis, context *)
 
+let hrefs_of_elt elt =
+  let localName = href_ds in
+  if elt#hasAttributeNS ~namespaceURI:xlink_ns ~localName then
+    let text =
+      (elt#getAttributeNS ~namespaceURI:xlink_ns ~localName)#to_string in
+    Some (HExtlib.split text)
+  else
+    None
+
 class clickableMathView obj =
 let text_width = 80 in
 object (self)
@@ -166,17 +175,24 @@ object (self)
   method private set_cic_info info = _cic_info <- info
   method private cic_info = _cic_info
 
+  val normal_cursor = Gdk.Cursor.create `LEFT_PTR
+  val href_cursor = Gdk.Cursor.create `HAND1
+
   initializer
     self#set_font_size !current_font_size;
     ignore (self#connect#selection_changed self#choose_selection_cb);
     ignore (self#event#connect#button_press self#button_press_cb);
     ignore (self#event#connect#button_release self#button_release_cb);
     ignore (self#event#connect#selection_clear self#selection_clear_cb);
+    ignore (self#connect#element_over self#element_over_cb);
     ignore (self#coerce#misc#connect#selection_get self#selection_get_cb)
 
   val mutable button_press_x = -1.
   val mutable button_press_y = -1.
   val mutable selection_changed = false
+  val mutable href_statusbar_msg:
+    (GMisc.statusbar_context * Gtk.statusbar_message) option = None
+    (* <statusbar ctxt, statusbar msg> *)
 
   method private selection_get_cb ctxt ~info ~time =
     let text =
@@ -208,6 +224,28 @@ object (self)
       self#popup_contextual_menu (GdkEvent.Button.time gdk_button);
     false
 
+  method private element_over_cb (elt_opt, _, _, _) =
+    let win () = self#misc#window in
+    let leave_href () =
+      Gdk.Window.set_cursor (win ()) normal_cursor;
+      HExtlib.iter_option (fun (ctxt, msg) -> ctxt#remove msg)
+        href_statusbar_msg
+    in
+    match elt_opt with
+    | Some elt ->
+        (match hrefs_of_elt elt with
+        | Some ((_ :: _) as hrefs) ->
+            Gdk.Window.set_cursor (win ()) href_cursor;
+            let msg_text = (* now create statusbar msg and store it *)
+              match hrefs with
+              | [ href ] -> sprintf "Hyperlink to %s" href
+              | _ -> sprintf "Hyperlinks to: %s" (String.concat ", " hrefs) in
+            let ctxt = (get_gui ())#main#statusBar#new_context ~name:"href" in
+            let msg = ctxt#push msg_text in
+            href_statusbar_msg <- Some (ctxt, msg)
+        | _ -> leave_href ())
+    | None -> leave_href ()
+
     (** @return a pattern structure which contains pretty printed terms *)
   method private tactic_text_pattern_of_selection =
     match self#get_selections with
@@ -275,25 +313,20 @@ object (self)
           (match self#get_element_at x y with
           | None -> ()
           | Some elt ->
-              let localName = href_ds in
-              if elt#hasAttributeNS ~namespaceURI:xlink_ns ~localName then
-                self#invoke_href_callback
-                  (elt#getAttributeNS ~namespaceURI:xlink_ns
-                    ~localName)#to_string
-                  gdk_button
-              else
-                ignore (self#action_toggle elt));
+              (match hrefs_of_elt elt with
+              | Some hrefs -> self#invoke_href_callback hrefs gdk_button
+              | None -> ignore (self#action_toggle elt)))
     end;
     false
 
-  method private invoke_href_callback href_value gdk_button =
+  method private invoke_href_callback hrefs gdk_button =
     let button = GdkEvent.Button.button gdk_button in
     if button = left_button then
       let time = GdkEvent.Button.time gdk_button in
       match href_callback with
       | None -> ()
       | Some f ->
-          (match HExtlib.split href_value with
+          (match hrefs with
           | [ uri ] ->  f uri
           | uris ->
               let menu = GMenu.menu () in