added decrease and increase font size fantafeature

[helm.git] / helm / matita / matitaMathView.ml

diff --git a/helm/matita/matitaMathView.ml b/helm/matita/matitaMathView.ml
index 75541ed9d49f93df76d54668e5c6e8502457410f..9c8ef985b3657261512f356384ac8d67276befda 100644 (file)
--- a/helm/matita/matitaMathView.ml
+++ b/helm/matita/matitaMathView.ml
@@ -56,6 +56,16 @@ object (self)
   method private script = MatitaScript.instance ()
 end
 
+let cicBrowsers = ref []
+
+let default_font_size () =
+  Helm_registry.get_opt_default Helm_registry.int
+    ~default:BuildTimeConf.default_font_size "matita.font_size"
+let current_font_size = ref ~-1
+let increase_font_size () = incr current_font_size
+let decrease_font_size () = decr current_font_size
+let reset_font_size () = current_font_size := default_font_size ()
+
 class clickableMathView obj =
   let href = Gdome.domString "href" in
   let xref = Gdome.domString "xref" in
@@ -66,6 +76,8 @@ class clickableMathView obj =
     method set_href_callback f = href_callback <- f
 
     initializer
+      current_font_size := default_font_size ();
+      self#set_font_size !current_font_size;
       ignore (self#connect#selection_changed self#choose_selection);
       ignore (self#connect#click (fun (gdome_elt, _, _, _) ->
         match gdome_elt with
@@ -95,6 +107,10 @@ class clickableMathView obj =
       match gdome_elt with
       | Some elt -> aux elt
       | None   -> self#set_selection None
+
+    method update_font_size = 
+      self#set_font_size !current_font_size
+      
   end
 
 let clickableMathView ?hadjustment ?vadjustment ?font_size ?log_verbosity =
@@ -111,7 +127,7 @@ class sequentViewer obj =
     inherit clickableMathView obj
 
     val mutable current_infos = None
-
+    
     method get_selected_terms =
       let selections = self#get_selections in
       list_map_fail
@@ -287,8 +303,6 @@ type term_source =
 
 exception Browser_failure of string
 
-let cicBrowsers = ref []
-
 class type cicBrowser =
 object
   method load: MatitaTypes.mathViewer_entry -> unit
@@ -581,6 +595,10 @@ class cicBrowser_impl ~(history:MatitaTypes.mathViewer_entry MatitaMisc.history)
         self#_historyAdd entry
       end
 
+      (** {2 methods accessing underlying GtkMathView} *)
+
+    method updateFontSize = mathView#set_font_size !current_font_size
+
       (** {2 methods used by constructor only} *)
 
     method win = win
@@ -620,8 +638,6 @@ let cicBrowser () =
   let history = new MatitaMisc.browser_history size (`About `Blank) in
   aux history
 
-let refresh_all_browsers () = List.iter (fun b -> b#refresh ()) !cicBrowsers
-
 let default_sequentViewer () = sequentViewer ~show:true ()
 let sequentViewer_instance = MatitaMisc.singleton default_sequentViewer
 
@@ -646,3 +662,10 @@ let mathViewer () =
     method show_uri_list ?(reuse=false) ~entry l =
       (self#get_browser reuse)#load entry
   end
+
+let refresh_all_browsers () = List.iter (fun b -> b#refresh ()) !cicBrowsers
+
+let update_font_sizes () =
+  List.iter (fun b -> b#updateFontSize) !cicBrowsers;
+  (sequentViewer_instance ())#update_font_size
+