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210 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Gtk.Layered.Refresh_Engine Luebeck --
-- Implementation Winter, 2011 --
-- --
-- Last revision : 13:15 14 Sep 2019 --
-- --
-- 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 Ada.IO_Exceptions; use Ada.IO_Exceptions;
with Ada.Unchecked_Deallocation;
with System.Address_To_Access_Conversions;
package body Gtk.Layered.Refresh_Engine is
package Conversions is
new System.Address_To_Access_Conversions
( Layered_Refresh_Engine'Class
);
function Where (Name : String) return String is
begin
return " in Gtk.Layered.Refresh_Engine" & Name;
end Where;
procedure Add
( Engine : in out Layered_Refresh_Engine;
Widget : not null access Gtk_Layered_Record'Class
) is
Element : List_Element_Ptr;
begin
if Engine.Active then
raise Use_Error with
"Adding a widget while engine is refreshing";
end if;
if Engine.List = null then
Element := new List_Element;
Engine.List := Element;
else
declare
This : not null access List_Element := Engine.List;
begin
loop
if ( Is_Valid (This.Widget)
and then
Get (This.Widget) = Widget
)
then
return;
end if;
exit when This.Next = Engine.List;
This := This.Next;
end loop;
end;
Element := new List_Element;
Element.Prev := Engine.List.Prev;
Element.Next := Engine.List;
Element.Prev.Next := Element;
Element.Next.Prev := Element;
end if;
Element.Widget.Set (Widget.all'Unchecked_Access);
end Add;
procedure Delete
( Engine : in out Layered_Refresh_Engine'Class;
This : List_Element_Ptr
) is
procedure Free is
new Ada.Unchecked_Deallocation
( List_Element,
List_Element_Ptr
);
Ptr : List_Element_Ptr := This;
begin
if Engine.List = This then
if This.Next = This then
Engine.List := null;
else
Engine.List := This.Next;
end if;
end if;
This.Prev.Next := This.Next;
This.Next.Prev := This.Prev;
Free (Ptr);
end Delete;
procedure Delete
( Engine : in out Layered_Refresh_Engine;
Widget : not null access Gtk_Layered_Record'Class
) is
begin
if Engine.Active then
raise Use_Error with
"Deleting a widget while engine is refreshing";
end if;
if Engine.List /= null then
declare
This : not null access List_Element := Engine.List;
begin
loop
if ( Is_Valid (This.Widget)
and then
Get (This.Widget) = Widget
)
then
Delete (Engine, This.all'Unchecked_Access);
return;
end if;
exit when This.Next = Engine.List;
This := This.Next;
end loop;
end;
end if;
end Delete;
procedure Finalize (Engine : in out Layered_Refresh_Engine) is
begin
if Engine.Timer /= 0 then
if 0 = Remove (Engine.Timer) then
null;
end if;
Engine.Timer := 0;
end if;
end Finalize;
function Get_Period (Engine : Layered_Refresh_Engine)
return Duration is
begin
return Engine.Period;
end Get_Period;
procedure Refresh (Engine : in out Layered_Refresh_Engine) is
begin
if Engine.List /= null then
Engine.Active := True;
declare
This : not null access List_Element := Engine.List;
Next : not null access List_Element := This;
begin
loop
Next := This.Next;
if Is_Valid (This.Widget) then
Queue_Draw (Get (This.Widget));
else
Delete (Engine, This.all'Unchecked_Access);
exit when Engine.List = null;
end if;
exit when Next = Engine.List;
This := Next;
end loop;
end;
Engine.Active := False;
end if;
end Refresh;
procedure Set_Period
( Engine : in out Layered_Refresh_Engine;
Period : Duration
) is
begin
if Period /= Engine.Period then
declare
Interval : constant GUInt :=
GUInt (GDouble (Period) * 1_000.0);
begin
if Engine.Timer /= 0 then
if 0 = Remove (Engine.Timer) then
null;
end if;
Engine.Timer := 0;
end if;
Engine.Timer :=
Timeout_Add
( Interval,
Timer'Access,
Engine'Address
);
Engine.Period := Period;
end;
end if;
end Set_Period;
function Timer (Data : System.Address) return GBoolean is
Engine : Layered_Refresh_Engine'Class renames
Conversions.To_Pointer (Data).all;
begin
Refresh (Engine);
return 1;
end Timer;
end Gtk.Layered.Refresh_Engine;
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