{
   $Id$
   System dependent system messages for unix

   Copyright (c) 2002 by Pierre Muller

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.


   This library 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.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
}


{ This file is still a dummy,
  it should use ioctl to get information about resizing of windows }

uses
{$ifdef VER1_0}
  linux;
{$else}
  unix;
{$endif}

Const
  SystemEventActive : Boolean = false;

type
  TWinSize = record
    ws_row, ws_col, ws_xpixel, ws_ypixel : smallint;
  end;


var
  lastxsize,lastysize : longint;

procedure InitSystemMsg;
var
  WinSize : TWinSize;
begin
  If SystemEventActive then
    exit;
  { Code to enable size tracking should go here }
  PendingSystemHead:=@PendingSystemEvent;
  PendingSystemTail:=@PendingSystemEvent;
  PendingSystemEvents:=0;
  FillChar(LastSystemEvent,sizeof(TSystemEvent),0);
  FillChar(WinSize,sizeof(WinSize),0);
  ioctl(stdinputhandle,TIOCGWINSZ,@winsize);
  LastXSize:=WinSize.ws_row;
  LastYSize:=WinSize.ws_col;
  If LastXSize=0 then
    LastXSize:=80;
  If LastYSize=0 then
    LastYSize:=25;

  SystemEventActive:=true;
end;


procedure DoneSystemMsg;
begin
  if not SystemEventActive then
    exit;
  { Code to disable size tracking should go here }
  SystemEventActive:=false;
end;

procedure GetSystemEvent(var SystemEvent: TSystemEvent);
begin
  if PendingSystemEvents=0 then
    PollSystemEvent(SystemEvent);
  if PendingSystemEvents=0 then
    exit;
  SystemEvent:=PendingSystemHead^;
  inc(PendingSystemHead);
  if longint(PendingSystemHead)=longint(@PendingSystemEvent)+sizeof(PendingSystemEvent) then
   PendingSystemHead:=@PendingSystemEvent;
  dec(PendingSystemEvents);
  LastSystemEvent:=SystemEvent;
end;


function PollSystemEvent(var SystemEvent: TSystemEvent):boolean;
var
  CloseState : word;
  WinSize : TWinSize;
begin
  SystemEvent.typ:=SysNothing;
  if not SystemEventActive then
    exit(false);
  if PendingSystemEvents>0 then
   begin
     SystemEvent:=PendingSystemHead^;
     PollSystemEvent:=true;
   end
  else
   begin
     FillChar(WinSize,sizeof(WinSize),0);
     ioctl(stdinputhandle,TIOCGWINSZ,@winsize);
     if (winsize.ws_col<>0) and (winsize.ws_row<>0) and
        ((winsize.ws_row<>lastxsize) or (winsize.ws_col<>lastysize)) then
       begin
         SystemEvent.typ:=SysResize;
         SystemEvent.x:=WinSize.ws_row;
         SystemEvent.y:=WinSize.ws_col;
         PutSystemEvent(SystemEvent);
         LastXSize:=WinSize.ws_row;
         LastYSize:=WinSize.ws_col;
         PollSystemEvent:=true;
       end
     else
       PollSystemEvent:=false;
    end;
end;

{
  $Log$
  Revision 1.2  2002-06-07 14:15:10  pierre
   * add window resizing support for unix

  Revision 1.1  2002/05/21 11:59:57  pierre
   + system messages unit added

}
