{
    $Id$
    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2000 by Florian Klaempfl
    member of the Free Pascal development team

    Keyboard unit for linux

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 **********************************************************************}
unit Keyboard;
interface

{$i keybrdh.inc}

implementation

uses
 KbdCalls, DosCalls;

{$i keyboard.inc}

const
 DefaultKeyboard = 0;
 Handle: word = DefaultKeyboard;

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

function SysGetKeyEvent: TKeyEvent;
var
 K: TKbdKeyInfo;
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;
    SysGetKeyEvent := cardinal ($0300 or fsState and $F) shl 16 or
                      cardinal (byte (chScan)) shl 8 or byte (chChar);
    end;
end;

function SysPollKeyEvent: TKeyEvent;
var
 K: TKbdKeyInfo;
 key : TKeyEvent;
 
begin
  Key:=0;
  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;
      Key:= cardinal ($0300 or fsState and $F) shl 16 or
            cardinal (byte (chScan)) shl 8 or byte (chChar);
      end;
  if (Key and $FFFF)=0 then 
   Key := 0;
  SysPollKeyEvent:=Key;
end;

function SysGetShiftState: Byte;

var
 K: TKbdInfo;
begin
 KbdGetFocus (IO_NoWait, Handle);
 KbdGetStatus (K, Handle);
 SysGetShiftState:=(K.fsState and $F);
end;

Const
  SysKeyboardDriver : TKeyboardDriver = (
    InitDriver : @SysInitKeyBoard;
    DoneDriver : @SysDoneKeyBoard;
    GetKeyevent : @SysGetKeyEvent;
    PollKeyEvent : @SysPollKeyEvent;
    GetShiftState : @SysGetShiftState;
    TranslateKeyEvent : Nil;
    TranslateKeyEventUnicode : Nil; 
  );

begin 
  SetKeyBoardDriver(SysKeyBoardDriver);
end.
{
  $Log$
  Revision 1.3  2001-09-21 21:33:36  michael
  + Merged driver support from fixbranch

  Revision 1.2.2.2  2001/09/21 21:20:43  michael
  + Added support for keyboard driver.
  + Added DefaultTranslateKeyEvent,DefaultTranslateKeyEventUnicode
  + PendingKeyEvent variable no longer public. Handling of this variable is
    now done entirely by global functions. System dependent code should not
    need it, it is set automatically.
  + InitVideo DoneVideo will check whether the keyboard is initialized or not.

  Revision 1.2.2.1  2001/01/30 21:52:02  peter
    * moved api utils to rtl

  Revision 1.2  2001/01/13 12:01:07  hajny
    * ErrorHandler correction

  Revision 1.1  2001/01/13 11:03:58  peter
    * API 2 RTL commit

}