1------------------------------------------------------------------------------ 2-- -- 3-- GNAT ncurses Binding Samples -- 4-- -- 5-- Sample.Header_Handler -- 6-- -- 7-- B O D Y -- 8-- -- 9------------------------------------------------------------------------------ 10-- Copyright 2020 Thomas E. Dickey -- 11-- Copyright 1998-2011,2014 Free Software Foundation, Inc. -- 12-- -- 13-- Permission is hereby granted, free of charge, to any person obtaining a -- 14-- copy of this software and associated documentation files (the -- 15-- "Software"), to deal in the Software without restriction, including -- 16-- without limitation the rights to use, copy, modify, merge, publish, -- 17-- distribute, distribute with modifications, sublicense, and/or sell -- 18-- copies of the Software, and to permit persons to whom the Software is -- 19-- furnished to do so, subject to the following conditions: -- 20-- -- 21-- The above copyright notice and this permission notice shall be included -- 22-- in all copies or substantial portions of the Software. -- 23-- -- 24-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS -- 25-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF -- 26-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. -- 27-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, -- 28-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR -- 29-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR -- 30-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. -- 31-- -- 32-- Except as contained in this notice, the name(s) of the above copyright -- 33-- holders shall not be used in advertising or otherwise to promote the -- 34-- sale, use or other dealings in this Software without prior written -- 35-- authorization. -- 36------------------------------------------------------------------------------ 37-- Author: Juergen Pfeifer, 1996 38-- Version Control 39-- $Revision: 1.21 $ 40-- $Date: 2020/02/02 23:34:34 $ 41-- Binding Version 01.00 42------------------------------------------------------------------------------ 43with Ada.Calendar; use Ada.Calendar; 44with Terminal_Interface.Curses.Text_IO.Integer_IO; 45with Sample.Manifest; use Sample.Manifest; 46 47pragma Elaborate_All (Terminal_Interface.Curses.Text_Io.Integer_IO); 48 49-- This package handles the painting of the header line of the screen. 50-- 51package body Sample.Header_Handler is 52 53 package Int_IO is new 54 Terminal_Interface.Curses.Text_IO.Integer_IO (Integer); 55 use Int_IO; 56 57 Header_Window : Window := Null_Window; 58 59 Display_Hour : Integer := -1; -- hour last displayed 60 Display_Min : Integer := -1; -- minute last displayed 61 Display_Day : Integer := -1; -- day last displayed 62 Display_Month : Integer := -1; -- month last displayed 63 64 -- This is the routine handed over to the curses library to be called 65 -- as initialization routine when ripping of the header lines from 66 -- the screen. This routine must follow C conventions. 67 function Init_Header_Window (Win : Window; 68 Columns : Column_Count) return Integer; 69 pragma Convention (C, Init_Header_Window); 70 71 procedure Internal_Update_Header_Window (Do_Update : Boolean); 72 73 -- The initialization must be called before Init_Screen. It steals two 74 -- lines from the top of the screen. 75 procedure Init_Header_Handler 76 is 77 begin 78 Rip_Off_Lines (2, Init_Header_Window'Access); 79 end Init_Header_Handler; 80 81 procedure N_Out (N : Integer); 82 83 -- Emit a two digit number and ensure that a leading zero is generated if 84 -- necessary. 85 procedure N_Out (N : Integer) 86 is 87 begin 88 if N < 10 then 89 Add (Header_Window, '0'); 90 Put (Header_Window, N, 1); 91 else 92 Put (Header_Window, N, 2); 93 end if; 94 end N_Out; 95 96 -- Paint the header window. The input parameter is a flag indicating 97 -- whether or not the screen should be updated physically after painting. 98 procedure Internal_Update_Header_Window (Do_Update : Boolean) 99 is 100 type Month_Name_Array is 101 array (Month_Number'First .. Month_Number'Last) of String (1 .. 9); 102 103 Month_Names : constant Month_Name_Array := 104 ("January ", 105 "February ", 106 "March ", 107 "April ", 108 "May ", 109 "June ", 110 "July ", 111 "August ", 112 "September", 113 "October ", 114 "November ", 115 "December "); 116 117 Now : constant Time := Clock; 118 Sec : constant Integer := Integer (Seconds (Now)); 119 Hour : constant Integer := Sec / 3600; 120 Minute : constant Integer := (Sec - Hour * 3600) / 60; 121 Mon : constant Month_Number := Month (Now); 122 D : constant Day_Number := Day (Now); 123 begin 124 if Header_Window /= Null_Window then 125 if Minute /= Display_Min 126 or else Hour /= Display_Hour 127 or else Display_Day /= D 128 or else Display_Month /= Mon 129 then 130 Move_Cursor (Header_Window, 0, 0); 131 N_Out (D); Add (Header_Window, '.'); 132 Add (Header_Window, Month_Names (Mon)); 133 Move_Cursor (Header_Window, 1, 0); 134 N_Out (Hour); Add (Header_Window, ':'); 135 N_Out (Minute); 136 Display_Min := Minute; 137 Display_Hour := Hour; 138 Display_Month := Mon; 139 Display_Day := D; 140 Refresh_Without_Update (Header_Window); 141 if Do_Update then 142 Update_Screen; 143 end if; 144 end if; 145 end if; 146 end Internal_Update_Header_Window; 147 148 -- This routine is called in the keyboard input timeout handler. So it will 149 -- periodically update the header line of the screen. 150 procedure Update_Header_Window 151 is 152 begin 153 Internal_Update_Header_Window (True); 154 end Update_Header_Window; 155 156 function Init_Header_Window (Win : Window; 157 Columns : Column_Count) return Integer 158 is 159 Title : constant String := "Ada 95 ncurses Binding Sample"; 160 Pos : Column_Position; 161 begin 162 Header_Window := Win; 163 if Win /= Null_Window then 164 if Has_Colors then 165 Set_Background (Win => Win, 166 Ch => (Ch => ' ', 167 Color => Header_Color, 168 Attr => Normal_Video)); 169 Set_Character_Attributes (Win => Win, 170 Attr => Normal_Video, 171 Color => Header_Color); 172 Erase (Win); 173 end if; 174 Leave_Cursor_After_Update (Win, True); 175 Pos := Columns - Column_Position (Title'Length); 176 Add (Win, 0, Pos / 2, Title); 177 -- In this phase we must not allow a physical update, because 178 -- ncurses is not properly initialized at this point. 179 Internal_Update_Header_Window (False); 180 return 0; 181 else 182 return -1; 183 end if; 184 end Init_Header_Window; 185 186end Sample.Header_Handler; 187