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Diffstat (limited to 'ncurses-5.3/Ada95/samples/sample-function_key_setting.adb')
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1 files changed, 214 insertions, 0 deletions
diff --git a/ncurses-5.3/Ada95/samples/sample-function_key_setting.adb b/ncurses-5.3/Ada95/samples/sample-function_key_setting.adb new file mode 100644 index 0000000..42f0fbf --- /dev/null +++ b/ncurses-5.3/Ada95/samples/sample-function_key_setting.adb @@ -0,0 +1,214 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT ncurses Binding Samples -- +-- -- +-- Sample.Function_Key_Setting -- +-- -- +-- 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.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 : in String; + Reset : in 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.Labels (I)); + if Reset then + Set_Soft_Label_Key (I, " "); + end if; + end loop; + P.Prev := Top_Of_Stack; + -- now store active help context and notepad + P.Help := Active_Context; + P.Notepad := Active_Notepad; + -- The notepad must now vanish and the new notepad is empty. + if (P.Notepad /= Null_Panel) then + Hide (P.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.Labels (I), Justification); + end loop; + pragma Assert (Active_Context /= null); + Release_String (Active_Context); + Active_Context := P.Help; + Refresh_Soft_Label_Keys_Without_Update; + Notepad_To_Context (P.Notepad); + Top_Of_Stack := P.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.Help.all = Key then + return True; + else + P := P.Prev; + end if; + end loop; + return False; + end if; + end Find_Context; + + procedure Notepad_To_Context (Pan : in 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; |