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115 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Gtk.Handlers.References Luebeck --
-- Implementation Spring, 2007 --
-- --
-- Last revision : 15:55 10 Sep 2011 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with System; use System;
with System.Address_To_Access_Conversions;
package body Gtk.Handlers.References is
package Conversions is
new System.Address_To_Access_Conversions (Handler_Reference);
type GClosureNotify is access
procedure (Data : Address; Closure : GClosure);
pragma Convention (C, GClosureNotify);
procedure Add_Invalidate_Notifier
( Closure : GClosure;
Notify_Data : Address;
Notify_Func : GClosureNotify
);
pragma Import
( C,
Add_Invalidate_Notifier,
"g_closure_add_invalidate_notifier"
);
procedure Invalidate (Closure : GClosure);
pragma Import (C, Invalidate, "g_closure_invalidate");
procedure Invalidated (Data : Address; Closure : GClosure);
pragma Convention (C, Invalidated);
function Get (Reference : Handler_Reference) return Handler_ID is
begin
return (Reference.ID, Reference.Closure);
end Get;
procedure Invalidated (Data : Address; Closure : GClosure) is
begin
Conversions.To_Pointer (Data).ID := Null_Handler_ID;
end Invalidated;
procedure Set
( Reference : in out Handler_Reference;
Handler : Handler_ID
) is
begin
if ( Reference.ID /= Handler.ID
or else
Reference.Closure /= Handler.Closure
)
then
Finalize (Reference);
if Handler.ID /= Null_Handler_ID then
Reference.ID := Handler.ID;
Reference.Closure := Handler.Closure;
Add_Invalidate_Notifier
( Handler.Closure,
Reference'Address,
Invalidated'Access
);
end if;
end if;
end Set;
procedure Set (Reference : in out Handler_Reference) is
begin
Finalize (Reference);
end Set;
procedure Adjust (Reference : in out Handler_Reference) is
begin
if Reference.ID /= Null_Handler_ID then
Add_Invalidate_Notifier
( Reference.Closure,
Reference'Address,
Invalidated'Access
);
end if;
end Adjust;
procedure Finalize (Reference : in out Handler_Reference) is
begin
if Reference.ID /= Null_Handler_ID then
Invalidate (Reference.Closure);
Reference.ID := Null_Handler_ID;
end if;
end Finalize;
end Gtk.Handlers.References;
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