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179 | --------------------------------------------------------------------
--
-- Unit Name: Hello_World body
--
-- File Name: hello_world.adb
--
-- Purpose: This procedure is a dummy main unit which withs
-- all the packages to be included in the TASH
-- library so that gnatmake can build all units.
--
-- It also serves as a quick test that everything
-- compiled OK.
--
-- Copyright (c) 1999-2000 Terry J. Westley
--
-- Tash is free software; you can redistribute it and/or modify it under
-- terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version. Tash 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 distributed with Tash; see file COPYING. If not, write to
--
-- Software Foundation
-- 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.
--
-- Tash is maintained at http://tcladashell.sourceforge.net/.
--
--------------------------------------------------------------------
with Ada.Text_IO;
with CArgv;
with Interfaces.C;
with Tcl.Ada;
with Tcl.Tk.Ada;
procedure Hello_World is -- Hello_World
use type Interfaces.C.int;
package CreateCommands is new Tcl.Ada.Generic_Command (Integer);
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr;
Interp : Tcl.Tcl_Interp;
Hello_Button : Tcl.Tk.Ada.Button;
Exit_Button : Tcl.Tk.Ada.Button;
Command : Tcl.Tcl_Command;
pragma Unreferenced (Command);
function Hello_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int;
pragma Convention (C, Hello_Command);
-- Declare a procedure, suitable for creating a Tcl command,
-- which will print "Hello World" when the "Hello World"
-- button is pressed.
function Hello_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int
is
pragma Unreferenced (ClientData, Interp, Argc, Argv);
begin -- Hello_Command
Ada.Text_IO.Put_Line ("Hello: Welcome to my TASH world!");
return Tcl.TCL_OK;
end Hello_Command;
function Exit_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int;
pragma Convention (C, Exit_Command);
-- Declare a procedure, suitable for creating a Tcl command,
-- which will terminate the program when pressed.
function Exit_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int
is
pragma Unreferenced (ClientData, Argc, Argv);
Result : Interfaces.C.int;
pragma Unreferenced (Result);
begin -- Exit_Command
Result := Tcl.Ada.Tcl_Eval (Interp, "destroy .");
return Tcl.Ada.Tcl_Eval (Interp, "exit");
end Exit_Command;
begin -- Hello_World
-- Get command-line arguments and put them into C-style "argv"
--------------------------------------------------------------
CArgv.Create (Argc, Argv);
-- Tcl needs to know the path name of the executable
-- otherwise Tcl.Tcl_Init below will fail.
----------------------------------------------------
Tcl.Tcl_FindExecutable (Argv.all);
-- Create one Tcl interpreter
-----------------------------
Interp := Tcl.Tcl_CreateInterp;
-- Initialize Tcl
-----------------
if Tcl.Tcl_Init (Interp) = Tcl.TCL_ERROR then
Ada.Text_IO.Put_Line
("Hello_World: Tcl.Tcl_Init failed: " &
Tcl.Ada.Tcl_GetStringResult (Interp));
return;
end if;
-- Initialize Tk
----------------
if Tcl.Tk.Tk_Init (Interp) = Tcl.TCL_ERROR then
Ada.Text_IO.Put_Line ("Cannot run GUI version of hello_world: ");
Ada.Text_IO.Put_Line (" " & Tcl.Ada.Tcl_GetStringResult (Interp));
Ada.Text_IO.Put_Line ("Hello: Welcome to my TASH world!");
return;
end if;
-- Set the Tk context so that we may use shortcut Tk
-- calls that require reference to the interpreter.
----------------------------------------------------
Tcl.Tk.Ada.Set_Context (Interp);
-- Create several new Tcl commands to call Ada subprograms
----------------------------------------------------------
Command :=
CreateCommands.Tcl_CreateCommand
(Interp,
"Hello",
Hello_Command'Access,
0,
null);
Command :=
CreateCommands.Tcl_CreateCommand
(Interp,
"Exit",
Exit_Command'Access,
0,
null);
-- Create and pack the Hello button
-----------------------------------
Hello_Button := Tcl.Tk.Ada.Create (".hello", "-text Hello -command Hello");
Tcl.Tk.Ada.Pack (Hello_Button, "-side left -fill both -expand yes");
-- Create and pack the Exit button
----------------------------------
Exit_Button := Tcl.Tk.Ada.Create (".exit", "-text Exit -command Exit");
Tcl.Tk.Ada.Pack (Exit_Button, "-side left -fill both -expand yes");
-- Loop inside Tk, waiting for commands to execute.
-- When there are no windows left, Tcl.Tk.Tk_MainLoop returns and we exit.
--------------------------------------------------------------------------
Tcl.Tk.Tk_MainLoop;
end Hello_World;
|