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------------------------------------------------------------------------------
-- --
-- GNAT ncurses Binding Samples --
-- --
-- Sample.Function_Key_Setting --
-- --
-- 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: 1.15 $
-- $Date: 2011/03/23 00:44:12 $
-- Binding Version 01.00
------------------------------------------------------------------------------
with Ada.Unchecked_Deallocation;
with Sample.Manifest; use Sample.Manifest;
-- This package implements a simple stack of function key label environments.
--
package body Sample.Function_Key_Setting is
Max_Label_Length : constant Positive := 8;
Number_Of_Keys : Label_Number := Label_Number'Last;
Justification : Label_Justification := Left;
subtype Label is String (1 .. Max_Label_Length);
type Label_Array is array (Label_Number range <>) of Label;
type Key_Environment (N : Label_Number := Label_Number'Last);
type Env_Ptr is access Key_Environment;
pragma Controlled (Env_Ptr);
type String_Access is access String;
pragma Controlled (String_Access);
Active_Context : String_Access := new String'("MAIN");
Active_Notepad : Panel := Null_Panel;
type Key_Environment (N : Label_Number := Label_Number'Last) is
record
Prev : Env_Ptr;
Help : String_Access;
Notepad : Panel;
Labels : Label_Array (1 .. N);
end record;
procedure Release_String is
new Ada.Unchecked_Deallocation (String,
String_Access);
procedure Release_Environment is
new Ada.Unchecked_Deallocation (Key_Environment,
Env_Ptr);
Top_Of_Stack : Env_Ptr := null;
procedure Push_Environment (Key : String;
Reset : Boolean := True)
is
P : constant Env_Ptr := new Key_Environment (Number_Of_Keys);
begin
-- Store the current labels in the environment
for I in 1 .. Number_Of_Keys loop
Get_Soft_Label_Key (I, P.all.Labels (I));
if Reset then
Set_Soft_Label_Key (I, " ");
end if;
end loop;
P.all.Prev := Top_Of_Stack;
-- now store active help context and notepad
P.all.Help := Active_Context;
P.all.Notepad := Active_Notepad;
-- The notepad must now vanish and the new notepad is empty.
if P.all.Notepad /= Null_Panel then
Hide (P.all.Notepad);
Update_Panels;
end if;
Active_Notepad := Null_Panel;
Active_Context := new String'(Key);
Top_Of_Stack := P;
if Reset then
Refresh_Soft_Label_Keys_Without_Update;
end if;
end Push_Environment;
procedure Pop_Environment
is
P : Env_Ptr := Top_Of_Stack;
begin
if Top_Of_Stack = null then
raise Function_Key_Stack_Error;
else
for I in 1 .. Number_Of_Keys loop
Set_Soft_Label_Key (I, P.all.Labels (I), Justification);
end loop;
pragma Assert (Active_Context /= null);
Release_String (Active_Context);
Active_Context := P.all.Help;
Refresh_Soft_Label_Keys_Without_Update;
Notepad_To_Context (P.all.Notepad);
Top_Of_Stack := P.all.Prev;
Release_Environment (P);
end if;
end Pop_Environment;
function Context return String
is
begin
if Active_Context /= null then
return Active_Context.all;
else
return "";
end if;
end Context;
function Find_Context (Key : String) return Boolean
is
P : Env_Ptr := Top_Of_Stack;
begin
if Active_Context.all = Key then
return True;
else
loop
exit when P = null;
if P.all.Help.all = Key then
return True;
else
P := P.all.Prev;
end if;
end loop;
return False;
end if;
end Find_Context;
procedure Notepad_To_Context (Pan : Panel)
is
W : Window;
begin
if Active_Notepad /= Null_Panel then
W := Get_Window (Active_Notepad);
Clear (W);
Delete (Active_Notepad);
Delete (W);
end if;
Active_Notepad := Pan;
if Pan /= Null_Panel then
Top (Pan);
end if;
Update_Panels;
Update_Screen;
end Notepad_To_Context;
procedure Initialize (Mode : Soft_Label_Key_Format := PC_Style;
Just : Label_Justification := Left)
is
begin
case Mode is
when PC_Style .. PC_Style_With_Index
=> Number_Of_Keys := 12;
when others
=> Number_Of_Keys := 8;
end case;
Init_Soft_Label_Keys (Mode);
Justification := Just;
end Initialize;
procedure Default_Labels
is
begin
Set_Soft_Label_Key (FKEY_QUIT, "Quit");
Set_Soft_Label_Key (FKEY_HELP, "Help");
Set_Soft_Label_Key (FKEY_EXPLAIN, "Keys");
Refresh_Soft_Label_Keys_Without_Update;
end Default_Labels;
function Notepad_Window return Window
is
begin
if Active_Notepad /= Null_Panel then
return Get_Window (Active_Notepad);
else
return Null_Window;
end if;
end Notepad_Window;
end Sample.Function_Key_Setting;
|
