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-----------------------------------------------------------------------
-- GtkAda - Ada95 binding for the Gimp Toolkit --
-- --
-- Copyright (C) 2000 --
-- 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. --
-- --
-- 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 Gdk.Drawable; use Gdk.Drawable;
with Gdk.Event; use Gdk.Event;
with Gdk.Rectangle; use Gdk.Rectangle;
with Gdk.Window; use Gdk.Window;
with Glib; use Glib;
with Gtk.Adjustment; use Gtk.Adjustment;
with Gtk.Button; use Gtk.Button;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Frame; use Gtk.Frame;
with Gtk.Handlers; use Gtk.Handlers;
with Gtk.Label; use Gtk.Label;
with Gtk.Layout; use Gtk.Layout;
with Gtk.Scrolled_Window; use Gtk.Scrolled_Window;
with Gtk.Style; use Gtk.Style;
package body Create_Layout is
package Event_Cb is new Gtk.Handlers.Return_Callback
(Gtk_Layout_Record, Boolean);
----------
-- Help --
----------
function Help return String is
begin
return "A @bGtk_Layout@B is a mixture between a @bGtk_Viewport@B and"
& " a @bGtk_Fixed@B. Its children can be located anywhere, the layout"
& " does not try to align them in any way. As opposed to a"
& " @bGtk_Fixed@B, there is no limit to the size of a @bGtk_Layout@B"
& " and it won't use as much memory as a @bGtk_Fixed@B."
& ASCII.LF
& "The area that is currently visible is indicated by two"
& " @bGtk_Alignment@B widgets. It can thus be put directly into a"
& " @bGtk_Scrolled_Window@B widget, as is the case in this demo."
& ASCII.LF
& "In this demo, the background is painted by a callback on the"
& " expose_event, and thus does not occupy any memory."
& " The Layout has a size of 1600 by 128000.";
end Help;
--------------------
-- Expose_Handler --
--------------------
function Expose_Handler (Layout : access Gtk_Layout_Record'Class;
Event : Gdk_Event_Expose)
return Boolean
is
Area : Gdk_Rectangle := Get_Area (Event);
Imin, Imax : Guint;
Jmin, Jmax : Guint;
begin
Imin := Guint (Area.X) / 10;
Imax := (Guint (Area.X) + Guint (Area.Width) + 9) / 10;
Jmin := Guint (Area.Y) / 10;
Jmax := (Guint (Area.Y) + Guint (Area.Height) + 9) / 10;
Clear_Area (Get_Window (Layout), Area.X, Area.Y, Gint (Area.Width),
Gint (Area.Height));
for I in Imin .. Imax - 1 loop
for J in Jmin .. Jmax - 1 loop
if (I + J) mod 2 /= 0 then
Draw_Rectangle (Get_Bin_Window (Layout),
Get_Black_Gc (Get_Style (Layout)),
True,
Gint (10 * I),
Gint (10 * J),
Gint (1 + I mod 10),
Gint (1 + J mod 10));
end if;
end loop;
end loop;
return True;
end Expose_Handler;
---------
-- Run --
---------
procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
Scrolled : Gtk_Scrolled_Window;
Layout : Gtk_Layout;
Button : Gtk_Button;
Label : Gtk_Label;
begin
Set_Label (Frame, "Layout");
Gtk_New (Scrolled);
Set_Shadow_Type (Scrolled, Shadow_In);
Add (Frame, Scrolled);
Set_Placement (Scrolled, Corner_Top_Right);
Gtk_New (Layout);
Set_Events (Layout, Exposure_Mask);
Add (Scrolled, Layout);
Set_Step_Increment (Get_Hadjustment (Layout), 10.0);
Set_Step_Increment (Get_Vadjustment (Layout), 10.0);
Event_Cb.Connect (Layout, "expose_event",
Event_Cb.To_Marshaller (Expose_Handler'Access));
Set_Size (Layout, 1600, 128000);
for I in 0 .. Gint'(15) loop
for J in 0 .. Gint'(15) loop
if (I + J) mod 2 /= 0 then
Gtk_New (Button, "Button " & Gint'Image (I)
& " " & Gint'Image (J));
Put (Layout, Button, J * 100, I * 100);
else
Gtk_New (Label, "Label " & Gint'Image (I)
& " " & Gint'Image (J));
Put (Layout, Label, J * 100, I * 100);
end if;
end loop;
end loop;
for I in 16 .. Gint'(1279) loop
if I mod 2 /= 0 then
Gtk_New (Button, "Button " & Gint'Image (I) & " 0");
Put (Layout, Button, 0, I * 100);
else
Gtk_New (Label, "Label " & Gint'Image (I) & " 0");
Put (Layout, Label, 0, I * 100);
end if;
end loop;
Show_All (Frame);
end Run;
end Create_Layout;
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