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------------------------------------------------------------------------------
-- --
-- GNAT ncurses Binding Samples --
-- --
-- Sample.Header_Handler --
-- --
-- B O D Y --
-- --
------------------------------------------------------------------------------
-- Copyright (c) 1998-2009,2011 Free Software Foundation, Inc. --
-- --
-- Permission is hereby granted, free of charge, to any person obtaining a --
-- copy of this software and associated documentation files (the --
-- "Software"), to deal in the Software without restriction, including --
-- without limitation the rights to use, copy, modify, merge, publish, --
-- distribute, distribute with modifications, sublicense, and/or sell --
-- copies of the Software, and to permit persons to whom the Software is --
-- furnished to do so, subject to the following conditions: --
-- --
-- The above copyright notice and this permission notice shall be included --
-- in all copies or substantial portions of the Software. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
-- --
-- Except as contained in this notice, the name(s) of the above copyright --
-- holders shall not be used in advertising or otherwise to promote the --
-- sale, use or other dealings in this Software without prior written --
-- authorization. --
------------------------------------------------------------------------------
-- Author: Juergen Pfeifer, 1996
-- Version Control
-- $Revision: 1.19 $
-- $Date: 2011/03/22 23:54:38 $
-- Binding Version 01.00
------------------------------------------------------------------------------
with Ada.Calendar; use Ada.Calendar;
with Terminal_Interface.Curses.Text_IO.Integer_IO;
with Sample.Manifest; use Sample.Manifest;
pragma Elaborate_All (Terminal_Interface.Curses.Text_Io.Integer_IO);
-- This package handles the painting of the header line of the screen.
--
package body Sample.Header_Handler is
package Int_IO is new
Terminal_Interface.Curses.Text_IO.Integer_IO (Integer);
use Int_IO;
Header_Window : Window := Null_Window;
Display_Hour : Integer := -1; -- hour last displayed
Display_Min : Integer := -1; -- minute last displayed
Display_Day : Integer := -1; -- day last displayed
Display_Month : Integer := -1; -- month last displayed
-- This is the routine handed over to the curses library to be called
-- as initialization routine when ripping of the header lines from
-- the screen. This routine must follow C conventions.
function Init_Header_Window (Win : Window;
Columns : Column_Count) return Integer;
pragma Convention (C, Init_Header_Window);
procedure Internal_Update_Header_Window (Do_Update : Boolean);
-- The initialization must be called before Init_Screen. It steals two
-- lines from the top of the screen.
procedure Init_Header_Handler
is
begin
Rip_Off_Lines (2, Init_Header_Window'Access);
end Init_Header_Handler;
procedure N_Out (N : Integer);
-- Emit a two digit number and ensure that a leading zero is generated if
-- necessary.
procedure N_Out (N : Integer)
is
begin
if N < 10 then
Add (Header_Window, '0');
Put (Header_Window, N, 1);
else
Put (Header_Window, N, 2);
end if;
end N_Out;
-- Paint the header window. The input parameter is a flag indicating
-- whether or not the screen should be updated physically after painting.
procedure Internal_Update_Header_Window (Do_Update : Boolean)
is
type Month_Name_Array is
array (Month_Number'First .. Month_Number'Last) of String (1 .. 9);
Month_Names : constant Month_Name_Array :=
("January ",
"February ",
"March ",
"April ",
"May ",
"June ",
"July ",
"August ",
"September",
"October ",
"November ",
"December ");
Now : constant Time := Clock;
Sec : constant Integer := Integer (Seconds (Now));
Hour : constant Integer := Sec / 3600;
Minute : constant Integer := (Sec - Hour * 3600) / 60;
Mon : constant Month_Number := Month (Now);
D : constant Day_Number := Day (Now);
begin
if Header_Window /= Null_Window then
if Minute /= Display_Min or else Hour /= Display_Hour
or else Display_Day /= D or else Display_Month /= Mon then
Move_Cursor (Header_Window, 0, 0);
N_Out (D); Add (Header_Window, '.');
Add (Header_Window, Month_Names (Mon));
Move_Cursor (Header_Window, 1, 0);
N_Out (Hour); Add (Header_Window, ':');
N_Out (Minute);
Display_Min := Minute;
Display_Hour := Hour;
Display_Month := Mon;
Display_Day := D;
Refresh_Without_Update (Header_Window);
if Do_Update then
Update_Screen;
end if;
end if;
end if;
end Internal_Update_Header_Window;
-- This routine is called in the keyboard input timeout handler. So it will
-- periodically update the header line of the screen.
procedure Update_Header_Window
is
begin
Internal_Update_Header_Window (True);
end Update_Header_Window;
function Init_Header_Window (Win : Window;
Columns : Column_Count) return Integer
is
Title : constant String := "Ada 95 ncurses Binding Sample";
Pos : Column_Position;
begin
Header_Window := Win;
if Win /= Null_Window then
if Has_Colors then
Set_Background (Win => Win,
Ch => (Ch => ' ',
Color => Header_Color,
Attr => Normal_Video));
Set_Character_Attributes (Win => Win,
Attr => Normal_Video,
Color => Header_Color);
Erase (Win);
end if;
Leave_Cursor_After_Update (Win, True);
Pos := Columns - Column_Position (Title'Length);
Add (Win, 0, Pos / 2, Title);
-- In this phase we must not allow a physical update, because
-- ncurses is not properly initialized at this point.
Internal_Update_Header_Window (False);
return 0;
else
return -1;
end if;
end Init_Header_Window;
end Sample.Header_Handler;
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