1 ------------------------------------------------------------------------------
3 -- GNAT ncurses Binding Samples --
5 -- Sample.Header_Handler --
9 ------------------------------------------------------------------------------
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35 ------------------------------------------------------------------------------
36 -- Author: Juergen Pfeifer, 1996
39 -- $Date: 2014/09/13 19:10:18 $
40 -- Binding Version 01.00
41 ------------------------------------------------------------------------------
42 with Ada.Calendar; use Ada.Calendar;
43 with Terminal_Interface.Curses.Text_IO.Integer_IO;
44 with Sample.Manifest; use Sample.Manifest;
46 pragma Elaborate_All (Terminal_Interface.Curses.Text_Io.Integer_IO);
48 -- This package handles the painting of the header line of the screen.
50 package body Sample.Header_Handler is
53 Terminal_Interface.Curses.Text_IO.Integer_IO (Integer);
56 Header_Window : Window := Null_Window;
58 Display_Hour : Integer := -1; -- hour last displayed
59 Display_Min : Integer := -1; -- minute last displayed
60 Display_Day : Integer := -1; -- day last displayed
61 Display_Month : Integer := -1; -- month last displayed
63 -- This is the routine handed over to the curses library to be called
64 -- as initialization routine when ripping of the header lines from
65 -- the screen. This routine must follow C conventions.
66 function Init_Header_Window (Win : Window;
67 Columns : Column_Count) return Integer;
68 pragma Convention (C, Init_Header_Window);
70 procedure Internal_Update_Header_Window (Do_Update : Boolean);
72 -- The initialization must be called before Init_Screen. It steals two
73 -- lines from the top of the screen.
74 procedure Init_Header_Handler
77 Rip_Off_Lines (2, Init_Header_Window'Access);
78 end Init_Header_Handler;
80 procedure N_Out (N : Integer);
82 -- Emit a two digit number and ensure that a leading zero is generated if
84 procedure N_Out (N : Integer)
88 Add (Header_Window, '0');
89 Put (Header_Window, N, 1);
91 Put (Header_Window, N, 2);
95 -- Paint the header window. The input parameter is a flag indicating
96 -- whether or not the screen should be updated physically after painting.
97 procedure Internal_Update_Header_Window (Do_Update : Boolean)
99 type Month_Name_Array is
100 array (Month_Number'First .. Month_Number'Last) of String (1 .. 9);
102 Month_Names : constant Month_Name_Array :=
116 Now : constant Time := Clock;
117 Sec : constant Integer := Integer (Seconds (Now));
118 Hour : constant Integer := Sec / 3600;
119 Minute : constant Integer := (Sec - Hour * 3600) / 60;
120 Mon : constant Month_Number := Month (Now);
121 D : constant Day_Number := Day (Now);
123 if Header_Window /= Null_Window then
124 if Minute /= Display_Min
125 or else Hour /= Display_Hour
126 or else Display_Day /= D
127 or else Display_Month /= Mon
129 Move_Cursor (Header_Window, 0, 0);
130 N_Out (D); Add (Header_Window, '.');
131 Add (Header_Window, Month_Names (Mon));
132 Move_Cursor (Header_Window, 1, 0);
133 N_Out (Hour); Add (Header_Window, ':');
135 Display_Min := Minute;
136 Display_Hour := Hour;
137 Display_Month := Mon;
139 Refresh_Without_Update (Header_Window);
145 end Internal_Update_Header_Window;
147 -- This routine is called in the keyboard input timeout handler. So it will
148 -- periodically update the header line of the screen.
149 procedure Update_Header_Window
152 Internal_Update_Header_Window (True);
153 end Update_Header_Window;
155 function Init_Header_Window (Win : Window;
156 Columns : Column_Count) return Integer
158 Title : constant String := "Ada 95 ncurses Binding Sample";
159 Pos : Column_Position;
161 Header_Window := Win;
162 if Win /= Null_Window then
164 Set_Background (Win => Win,
166 Color => Header_Color,
167 Attr => Normal_Video));
168 Set_Character_Attributes (Win => Win,
169 Attr => Normal_Video,
170 Color => Header_Color);
173 Leave_Cursor_After_Update (Win, True);
174 Pos := Columns - Column_Position (Title'Length);
175 Add (Win, 0, Pos / 2, Title);
176 -- In this phase we must not allow a physical update, because
177 -- ncurses is not properly initialized at this point.
178 Internal_Update_Header_Window (False);
183 end Init_Header_Window;
185 end Sample.Header_Handler;