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Diffstat (limited to 'ncurses-5.3/Ada95/samples/sample-header_handler.adb')
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1 files changed, 181 insertions, 0 deletions
diff --git a/ncurses-5.3/Ada95/samples/sample-header_handler.adb b/ncurses-5.3/Ada95/samples/sample-header_handler.adb new file mode 100644 index 0000000..d65e88c --- /dev/null +++ b/ncurses-5.3/Ada95/samples/sample-header_handler.adb @@ -0,0 +1,181 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT ncurses Binding Samples -- +-- -- +-- Sample.Header_Handler -- +-- -- +-- B O D Y -- +-- -- +------------------------------------------------------------------------------ +-- Copyright (c) 1998 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 +-- Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en +-- Version Control +-- $Revision$ +-- Binding Version 01.00 +------------------------------------------------------------------------------ +with Ada.Calendar; use Ada.Calendar; +with Terminal_Interface.Curses.Text_IO.Integer_IO; +with Sample.Manifest; use Sample.Manifest; + +-- 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 : in 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 : in Integer); + + -- Emit a two digit number and ensure that a leading zero is generated if + -- necessary. + procedure N_Out (N : in 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 : in 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 : Time := Clock; + Sec : Integer := Integer (Seconds (Now)); + Hour : Integer := Sec / 3600; + Minute : Integer := (Sec - Hour * 3600) / 60; + Mon : Month_Number := Month (Now); + D : 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 isnīt 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; |