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|
-----------------------------------------------------------------------
-- GtkAda - Ada95 binding for the Gimp Toolkit --
-- --
-- Copyright (C) 1998-1999 --
-- Emmanuel Briot, Joel Brobecker and Arnaud Charlet --
-- --
-- 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. --
-- --
-----------------------------------------------------------------------
with Glib; use Glib;
with Gtk.Box; use Gtk.Box;
with Gtk.Enums; use Gtk.Enums;
with Glib.Main; use Glib.Main;
with Gtk.Preview; use Gtk.Preview;
with Gtk.Widget; use Gtk.Widget;
with Gtk.Window; use Gtk.Window;
with Gtk; use Gtk;
with Common; use Common;
package body Create_Preview_Gray is
package Preview_Idle is new Glib.Main.Generic_Sources (Gtk_Preview);
Window : aliased Gtk.Window.Gtk_Window;
Gray_Idle : G_Source_Id := 0;
Count : Guchar := 1;
----------
-- Help --
----------
function Help return String is
begin
return "The @bGtk_Preview@B widget displays an RGB image, which can be"
& " easily manipulated through an array of @bGuchar@Bs. The image"
& " can be either color or grayscale.";
end Help;
--------------------
-- Gray_Idle_Func --
--------------------
function Gray_Idle_Func (Preview : Gtk_Preview) return Boolean is
Buf : Guchar_Array (0 .. 255);
begin
for I in 0 .. Guchar'(255) loop
for J in 0 .. (255) loop
Buf (J) := I + Guchar (J) + Count;
end loop;
Draw_Row (Preview, Buf, 0, Gint (I), 256);
end loop;
Count := Count + 1;
Draw (Preview);
return True;
end Gray_Idle_Func;
---------------------
-- Preview_Destroy --
---------------------
procedure Preview_Destroy (Dummy : access Gtk_Widget_Record'Class) is
pragma Warnings (Off, Dummy);
begin
if Gray_Idle > 0 then
Remove (Gray_Idle);
Gray_Idle := 0;
end if;
Window := null;
end Preview_Destroy;
------------------
-- Demo_Destroy --
------------------
procedure Demo_Destroy (Dummy : access Gtk_Widget_Record'Class) is
begin
if Window /= null then
Destroy (Window);
Preview_Destroy (Dummy);
end if;
end Demo_Destroy;
---------
-- Run --
---------
procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
Preview : Gtk_Preview;
Box : Gtk_Box;
begin
if Window = null then
-- Create a dummy widget, that will tell us whenever the user
-- selected a new demo (since the children of Frame are automatically
-- deleted in that case). We can then close the dialog.
Gtk_New_Vbox (Box, Homogeneous => False);
Add (Frame, Box);
Widget_Handler.Connect
(Box, "destroy",
Widget_Handler.To_Marshaller (Demo_Destroy'Access));
-- Now create the real demo
Gtk_New (Window, Window_Toplevel);
Widget_Handler.Connect
(Window, "destroy",
Widget_Handler.To_Marshaller (Preview_Destroy'Access));
Set_Title (Window, "test");
Set_Border_Width (Window, Border_Width => 10);
Gtk_New (Preview, Preview_Grayscale);
Size (Preview, 256, 256);
Add (Window, Preview);
Show (Preview);
Gray_Idle := Preview_Idle.Idle_Add (Gray_Idle_Func'Access, Preview);
Show (Window);
else
Destroy (Window);
end if;
end Run;
end Create_Preview_Gray;
|
