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276 | ------------------------------------------------
--
-- timer_app.adb -- This program demonstrates how the TASH Ada/Tk interface
-- provides Tk features for use in an Ada program.
--
-- Copyright (c) 2017-2022 Simon Wright <simon@pushface.org>
-- Copyright (c) 1997 Terry J. Westley
--
-- See the file "license.htm" for information on usage and
-- redistribution of this file, and a DISCLAIMER OF ALL WARRANTIES.
--
-- This program was adapted from the demo program distributed with Tk.
-- It provides a simple stop watch timer facility.
--
------------------------------------------------
-- This package provides the Init function required for the demo
-- program Timer.
with CArgv;
with Tcl.Ada;
with Tcl.Tk;
with Tcl.Tk.Ada;
package body Timer_App is
use Tcl;
type Timer_Type is delta 0.01 digits 8 range 0.0 .. 999999.99;
Counter : Tcl.Tk.Ada.Label;
Start_Button : Tcl.Tk.Ada.Button;
Stop_Button : Tcl.Tk.Ada.Button;
Time_Value : Timer_Type := 0.0;
Stopped : Boolean := True;
-- Update the window by displaying the current value of the timer.
-------------------------------------------------------------------
procedure Update;
procedure Update is
begin -- Update
Tcl.Tk.Ada.configure
(Counter,
"-text " & Timer_Type'Image (Time_Value));
end Update;
-- Increment the timer by one "tick." A tick is 50 milliseconds
-- (or 5 hundredths of a second).
-----------------------------------------------------------------
procedure Tick;
procedure Tick is
begin -- Tick
-- if the timer is stopped, do not increment
-- its value or reschedule tick for future execution.
------------------------------------------------------
if Stopped then
return;
end if;
-- Schedule tick to be called again in 50 milliseconds.
--------------------------------------------------------
Tcl.Tk.Ada.After (50, "tick");
-- Increment the timer value
------------------------------
Time_Value := Time_Value + 0.05;
-- Update the timer display.
----------------------------
Update;
end Tick;
function Tick_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int;
pragma Convention (C, Tick_Command);
-- Declare a procedure, suitable for creating a Tcl command,
-- which will increment the timer.
-------------------------------------------------------------
function Tick_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 -- Tick_Command
Tick;
return Tcl.TCL_OK;
end Tick_Command;
function Start_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int;
pragma Convention (C, Start_Command);
-- Declare a procedure, suitable for creating a Tcl command,
-- which will start the timer if it is currently stopped. Also,
-- change the Stop button (currently labeled "Reset") to display "Stop."
-------------------------------------------------------------------------
function Start_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 -- Start_Command
if Stopped then
Stopped := False;
Tcl.Tk.Ada.configure (Stop_Button, "-text Stop -command Stop");
Tick;
Tcl.Tk.Ada.Set_Trace (False);
end if;
return Tcl.TCL_OK;
end Start_Command;
function Stop_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int;
pragma Convention (C, Stop_Command);
-- Declare a procedure, suitable for creating a Tcl command,
-- which will stop incrementing the timer. Also, relabel the
-- Stop button to be a Reset button.
--------------------------------------------------------------
function Stop_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 -- Stop_Command
Tcl.Tk.Ada.Set_Trace (True);
Stopped := True;
Tcl.Tk.Ada.configure (Stop_Button, "-text Reset -command Reset");
return Tcl.TCL_OK;
end Stop_Command;
-- Reset the timer's value to 0.0 and update the display.
----------------------------------------------------------
procedure Reset;
procedure Reset is
begin -- Reset
Time_Value := 0.0;
Stopped := True;
Update;
end Reset;
function Reset_Command
(ClientData : Integer;
Interp : Tcl.Tcl_Interp;
Argc : Interfaces.C.int;
Argv : CArgv.Chars_Ptr_Ptr)
return Interfaces.C.int;
pragma Convention (C, Reset_Command);
-- Declare a procedure, suitable for creating a Tcl command,
-- which will reset the timer to 0.0 and update the display.
-------------------------------------------------------------
function Reset_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 -- Reset_Command
Reset;
return Tcl.TCL_OK;
end Reset_Command;
function Init (Interp : Tcl.Tcl_Interp)
return Interfaces.C.int
is
package CreateCommands is new Tcl.Ada.Generic_Command (Integer);
Command : Tcl.Tcl_Command;
pragma Unreferenced (Command);
use type Interfaces.C.int;
begin
Tcl.Tk.Ada.Set_Trace (True);
-- Initialize Tcl
if Tcl.Tcl_Init (Interp) = Tcl.TCL_ERROR then
return Tcl.TCL_ERROR;
end if;
-- Initialize Tk
if Tcl.Tk.Tk_Init (Interp) = Tcl.TCL_ERROR then
return Tcl.TCL_ERROR;
end if;
-- Create several new Tcl commands to call Ada subprograms.
Command :=
CreateCommands.Tcl_CreateCommand
(Interp,
"tick",
Tick_Command'Access,
0,
null);
Command :=
CreateCommands.Tcl_CreateCommand
(Interp,
"Start",
Start_Command'Access,
0,
null);
Command :=
CreateCommands.Tcl_CreateCommand
(Interp,
"Stop",
Stop_Command'Access,
0,
null);
Command :=
CreateCommands.Tcl_CreateCommand
(Interp,
"Reset",
Reset_Command'Access,
0,
null);
-- 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 and pack the counter text widget
Counter :=
Tcl.Tk.Ada.Create (".counter", "-text 0.00 -relief raised -width 10");
Tcl.Tk.Ada.Pack (Counter, "-side bottom -fill both");
-- Create and pack the Start button
Start_Button := Tcl.Tk.Ada.Create (".start",
"-text Start -command Start");
Tcl.Tk.Ada.Pack (Start_Button, "-side left -fill both -expand yes");
-- Create and pack the Stop button
-----------------------------------
Stop_Button := Tcl.Tk.Ada.Create (".stop", "-text Reset -command Reset");
Tcl.Tk.Ada.Pack (Stop_Button, "-side left -fill both -expand yes");
-- Bind ^C and ^Q keys to exit
-------------------------------
Tcl.Tk.Ada.Bind_To_Main_Window (Interp,
"<Control-c>",
"{destroy .;exit}");
Tcl.Tk.Ada.Bind_To_Main_Window (Interp,
"<Control-q>",
"{destroy .;exit}");
-- Reset timer value to 0.0
----------------------------
Reset;
return Tcl.TCL_OK;
end Init;
end Timer_App;
|