source: trunk/essentials/sys-libs/ncurses/Ada95/samples/sample-keyboard_handler.adb@ 3166

Last change on this file since 3166 was 2621, checked in by bird, 20 years ago

GNU ncurses 5.5
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1------------------------------------------------------------------------------
2-- --
3-- GNAT ncurses Binding Samples --
4-- --
5-- Sample.Keyboard_Handler --
6-- --
7-- B O D Y --
8-- --
9------------------------------------------------------------------------------
10-- Copyright (c) 1998,2004 Free Software Foundation, Inc. --
11-- --
12-- Permission is hereby granted, free of charge, to any person obtaining a --
13-- copy of this software and associated documentation files (the --
14-- "Software"), to deal in the Software without restriction, including --
15-- without limitation the rights to use, copy, modify, merge, publish, --
16-- distribute, distribute with modifications, sublicense, and/or sell --
17-- copies of the Software, and to permit persons to whom the Software is --
18-- furnished to do so, subject to the following conditions: --
19-- --
20-- The above copyright notice and this permission notice shall be included --
21-- in all copies or substantial portions of the Software. --
22-- --
23-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
24-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
25-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
26-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
27-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
28-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
29-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
30-- --
31-- Except as contained in this notice, the name(s) of the above copyright --
32-- holders shall not be used in advertising or otherwise to promote the --
33-- sale, use or other dealings in this Software without prior written --
34-- authorization. --
35------------------------------------------------------------------------------
36-- Author: Juergen Pfeifer, 1996
37-- Version Control
38-- $Revision: 1.12 $
39-- $Date: 2004/08/21 21:37:00 $
40-- Binding Version 01.00
41------------------------------------------------------------------------------
42with Ada.Strings; use Ada.Strings;
43with Ada.Strings.Fixed; use Ada.Strings.Fixed;
44with Ada.Strings.Maps.Constants; use Ada.Strings.Maps.Constants;
45with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
46with Ada.Characters.Handling; use Ada.Characters.Handling;
47
48with Terminal_Interface.Curses.Panels; use Terminal_Interface.Curses.Panels;
49with Terminal_Interface.Curses.Forms; use Terminal_Interface.Curses.Forms;
50with Terminal_Interface.Curses.Forms.Field_Types.Enumeration;
51use Terminal_Interface.Curses.Forms.Field_Types.Enumeration;
52
53with Sample.Header_Handler; use Sample.Header_Handler;
54with Sample.Form_Demo.Aux; use Sample.Form_Demo.Aux;
55with Sample.Manifest; use Sample.Manifest;
56with Sample.Form_Demo.Handler;
57
58-- This package contains a centralized keyboard handler used throughout
59-- this example. The handler establishes a timeout mechanism that provides
60-- periodical updates of the common header lines used in this example.
61--
62
63package body Sample.Keyboard_Handler is
64
65 In_Command : Boolean := False;
66
67 function Get_Key (Win : Window := Standard_Window) return Real_Key_Code
68 is
69 K : Real_Key_Code;
70
71 function Command return Real_Key_Code;
72
73
74 function Command return Real_Key_Code
75 is
76 function My_Driver (F : Form;
77 C : Key_Code;
78 P : Panel) return Boolean;
79 package Fh is new Sample.Form_Demo.Handler (My_Driver);
80
81 type Label_Array is array (Label_Number) of String (1 .. 8);
82
83 Labels : Label_Array;
84
85 FA : Field_Array_Access := new Field_Array'
86 (Make (0, 0, "Command:"),
87 Make (Top => 0, Left => 9, Width => Columns - 11),
88 Null_Field);
89
90 K : Real_Key_Code := Key_None;
91 N : Natural := 0;
92
93 function My_Driver (F : Form;
94 C : Key_Code;
95 P : Panel) return Boolean
96 is
97 Ch : Character;
98 begin
99 if P = Null_Panel then
100 raise Panel_Exception;
101 end if;
102 if C in User_Key_Code'Range and then C = QUIT then
103 if Driver (F, F_Validate_Field) = Form_Ok then
104 K := Key_None;
105 return True;
106 end if;
107 elsif C in Normal_Key_Code'Range then
108 Ch := Character'Val (C);
109 if Ch = LF or else Ch = CR then
110 if Driver (F, F_Validate_Field) = Form_Ok then
111 declare
112 Buffer : String (1 .. Positive (Columns - 11));
113 Cmdc : String (1 .. 8);
114 begin
115 Get_Buffer (Fld => FA (2), Str => Buffer);
116 Trim (Buffer, Left);
117 if Buffer (1) /= ' ' then
118 Cmdc := To_Upper (Buffer (Cmdc'Range));
119 for I in Labels'Range loop
120 if Cmdc = Labels (I) then
121 K := Function_Key_Code
122 (Function_Key_Number (I));
123 exit;
124 end if;
125 end loop;
126 end if;
127 return True;
128 end;
129 end if;
130 end if;
131 end if;
132 return False;
133 end My_Driver;
134
135 begin
136 In_Command := True;
137 for I in Label_Number'Range loop
138 Get_Soft_Label_Key (I, Labels (I));
139 Trim (Labels (I), Left);
140 Translate (Labels (I), Upper_Case_Map);
141 if Labels (I) (1) /= ' ' then
142 N := N + 1;
143 end if;
144 end loop;
145 if N > 0 then -- some labels were really set
146 declare
147 Enum_Info : Enumeration_Info (N);
148 Enum_Field : Enumeration_Field;
149 J : Positive := Enum_Info.Names'First;
150
151 Frm : Form := Create (FA);
152
153 begin
154 for I in Label_Number'Range loop
155 if Labels (I) (1) /= ' ' then
156 Enum_Info.Names (J) := new String'(Labels (I));
157 J := J + 1;
158 end if;
159 end loop;
160 Enum_Field := Create (Enum_Info, True);
161 Set_Field_Type (FA (2), Enum_Field);
162 Set_Background (FA (2), Normal_Video);
163
164 Fh.Drive_Me (Frm, Lines - 3, 0);
165 Delete (Frm);
166 Update_Panels; Update_Screen;
167 end;
168 end if;
169 Free (FA, True);
170 In_Command := False;
171 return K;
172 end Command;
173
174 begin
175 Set_Timeout_Mode (Win, Delayed, 30000);
176 loop
177 K := Get_Keystroke (Win);
178 if K = Key_None then -- a timeout occured
179 Update_Header_Window;
180 elsif K = 3 and then not In_Command then -- CTRL-C
181 K := Command;
182 exit when K /= Key_None;
183 else
184 exit;
185 end if;
186 end loop;
187 return K;
188 end Get_Key;
189
190 procedure Init_Keyboard_Handler is
191 begin
192 null;
193 end Init_Keyboard_Handler;
194
195end Sample.Keyboard_Handler;
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