{
  System independent keyboard interface for os2

  $Id$
}
uses
{$IFDEF PPC_FPC}
 KbdCalls, DosCalls;
{$ELSE}
 {$IFDEF PPC_VIRTUAL}
 OS2Base;
 {$ELSE}
  {$IFDEF PPC_BPOS2}
 Os2Subs, DosProcs;
  {$ELSE}
   {$IFDEF PPC_SPEED}
 BseSub, BseDos;
   {$ENDIF}
  {$ENDIF}
 {$ENDIF} 
{$ENDIF}

{$IFDEF PPC_VIRTUAL}
type
 TKbdKeyInfo = KbdKeyInfo;
 TKbdInfo = KbdInfo;
{$ELSE}
 {$IFDEF PPC_SPEED}
type
 TKbdKeyInfo = KbdKeyInfo;
 TKbdInfo = KbdInfo;
 {$ENDIF}
{$ENDIF}
{$IFNDEF PPC_FPC}
type
 cardinal = longint;
{$ENDIF}

const
 DefaultKeyboard = 0;
 Handle: word = DefaultKeyboard;

procedure InitKeyboard;
var
 K: TKbdInfo;
begin
 if KbdGetFocus (IO_Wait, DefaultKeyboard) = No_Error then
 begin
  if KbdOpen (Handle) <> No_Error then Handle := DefaultKeyboard;
  KbdFlushBuffer (Handle);
  KbdFreeFocus (DefaultKeyboard);
  KbdGetFocus (IO_Wait, Handle);
  K.cb := 10;
  KbdGetStatus (K, Handle);
  K.fsMask := $14;
  KbdSetStatus (K, Handle);
 end;
end;

procedure DoneKeyboard;
begin
 KbdFreeFocus (Handle);
 if KbdGetFocus (IO_Wait, DefaultKeyboard) = No_Error then
 begin
  KbdClose (Handle);
  Handle := DefaultKeyboard;
  KbdFreeFocus (DefaultKeyboard);
 end;
end;

function GetKeyEvent: TKeyEvent;
var
 K: TKbdKeyInfo;
begin
 if PendingKeyEvent <> 0 then
 begin
  GetKeyEvent := PendingKeyEvent;
  PendingKeyEvent := 0;
 end else
 begin
  KbdGetFocus (IO_Wait, Handle);
  while (KbdCharIn (K, IO_Wait, Handle) <> No_Error)
                                   or (K.fbStatus and $40 = 0) do DosSleep (5);
  with K do
  begin
   if (byte (chChar) = $E0) and (fbStatus and 2 <> 0) then chChar := #0;
   GetKeyEvent := cardinal ($0300 or fsState and $F) shl 16 or
                               cardinal (byte (chScan)) shl 8 or byte (chChar);
  end;
 end;
end;

function PollKeyEvent: TKeyEvent;
var
 K: TKbdKeyInfo;
begin
 if PendingKeyEvent = 0 then
 begin
  KbdGetFocus (IO_NoWait, Handle);
  if (KbdCharIn (K, IO_NoWait, Handle) <> No_Error) or
                 (K.fbStatus and $40 = 0) then FillChar (K, SizeOf (K), 0) else
  with K do
  begin
   if (byte (chChar) = $E0) and (fbStatus and 2 <> 0) then chChar := #0;
   PendingKeyEvent := cardinal ($0300 or fsState and $F) shl 16 or
                               cardinal (byte (chScan)) shl 8 or byte (chChar);
  end;
 end;
 PollKeyEvent := PendingKeyEvent;
 if PendingKeyEvent and $FFFF = 0 then PendingKeyEvent := 0;
end;

function PollShiftStateEvent: TKeyEvent;
var
 K: TKbdInfo;
begin
 KbdGetFocus (IO_NoWait, Handle);
 KbdGetStatus (K, Handle);
 PollShiftStateEvent := cardinal (K.fsState and $F) shl 16;
end;

type
{$IFDEF PPC_FPC}
 TTranslationEntry = packed record
{$ELSE}
 TTranslationEntry = record
{$ENDIF}
  Min, Max: byte;
  Offset: word;
 end;

const
 TranslationTableEntries = 12;
 TranslationTable: array [1..TranslationTableEntries] of TTranslationEntry =
    ((Min: $3B; Max: $44; Offset: kbdF1),   { function keys F1-F10 }
     (Min: $54; Max: $5D; Offset: kbdF1),   { Shift fn keys F1-F10 }
     (Min: $5E; Max: $67; Offset: kbdF1),   { Ctrl fn keys F1-F10 }
     (Min: $68; Max: $71; Offset: kbdF1),   { Alt fn keys F1-F10 }
     (Min: $85; Max: $86; Offset: kbdF11),  { function keys F11-F12 }
     (Min: $87; Max: $88; Offset: kbdF11),  { Shift+function keys F11-F12 }
     (Min: $89; Max: $8A; Offset: kbdF11),  { Ctrl+function keys F11-F12 }
     (Min: $8B; Max: $8C; Offset: kbdF11),  { Alt+function keys F11-F12 }
     (Min:  71; Max:  73; Offset: kbdHome), { Keypad keys kbdHome-kbdPgUp }
     (Min:  75; Max:  77; Offset: kbdLeft), { Keypad keys kbdLeft-kbdRight }
     (Min:  79; Max:  81; Offset: kbdEnd),  { Keypad keys kbdEnd-kbdPgDn }
     (Min: $52; Max: $53; Offset: kbdInsert));


function TranslateKeyEvent (KeyEvent: TKeyEvent): TKeyEvent;
var
 I: integer;
 ScanCode: byte;
begin
 if KeyEvent and $03000000 = $03000000 then
 begin
  if (KeyEvent and $000000FF <> 0) and (KeyEvent and $000000FF <> $E0) then
                               TranslateKeyEvent := KeyEvent and $00FFFFFF else
  begin
{ This is a function key }
   ScanCode := (KeyEvent and $0000FF00) shr 8;
   I := 1;
   while (I <= TranslationTableEntries) and
       ((TranslationTable [I].Min > ScanCode) or
                             (ScanCode > TranslationTable [I].Max)) do Inc (I);
   if I > TranslationTableEntries then TranslateKeyEvent := KeyEvent else
           TranslateKeyEvent := $02000000 + (KeyEvent and $00FF0000) +
             (ScanCode - TranslationTable[I].Min) + TranslationTable[I].Offset;
  end;
 end else TranslateKeyEvent := KeyEvent;
end;

function TranslateKeyEventUniCode (KeyEvent: TKeyEvent): TKeyEvent;
begin
 TranslateKeyEventUniCode := KeyEvent;
 ErrorHandler (errKbdNotImplemented, nil);
end;

{
  $Log$
  Revision 1.3  2000-10-08 18:41:58  hajny
    * $E0 for ext. keys correctly discarded now

  Revision 1.2  2000/07/13 11:32:26  michael
  + removed logs
 
}