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128 lines
2.9 KiB
ObjectPascal
128 lines
2.9 KiB
ObjectPascal
{
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Unit to handle system events
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Copyright 2000 by Pierre Muller <muller@ics.u-strasbg.fr>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************}
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Unit sysmsg;
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interface
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type
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TSystemMessage = (
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SysNothing,
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SysSetFocus,
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SysReleaseFocus,
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SysClose,
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SysResize );
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TSystemEvent = Record
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case typ : TSystemMessage of
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SysClose : ( CloseTyp : Longint);
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SysResize : (X,Y : Longint);
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end;
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PSystemEvent = ^TSystemEvent;
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const
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SystemEventBufSize = 16;
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var
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PendingSystemEvent : array[0..SystemEventBufSize-1] of TSystemEvent;
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PendingSystemHead,
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PendingSystemTail : PSystemEvent;
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PendingSystemEvents : byte;
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LastSystemEvent : TSystemEvent;
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procedure InitSystemMsg;
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procedure DoneSystemMsg;
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procedure GetSystemEvent(var SystemEvent:TSystemEvent);
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{ Returns the last SystemEvent, and waits for one if not available }
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procedure PutSystemEvent(const SystemEvent: TSystemEvent);
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{ Adds the given SystemEvent to the input queue. }
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function PollSystemEvent(var SystemEvent: TSystemEvent):boolean;
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{ Checks if a SystemEvent is available, and returns it if one is found. If no
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event is pending, it returns 0 }
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implementation
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{$undef HAS_SYSMSG}
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{$ifdef go32v2}
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{$i go32smsg.inc}
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{$define HAS_SYSMSG}
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{$endif go32v2}
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{$ifdef win32}
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{$i w32smsg.inc}
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{$define HAS_SYSMSG}
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{$endif win32}
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{$ifdef unix}
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{$i unixsmsg.inc}
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{$define HAS_SYSMSG}
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{$endif unix}
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{$ifdef HAS_SYSMSG}
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procedure PutSystemEvent(const SystemEvent: TSystemEvent);
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begin
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if PendingSystemEvents<SystemEventBufSize then
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begin
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PendingSystemTail^:=SystemEvent;
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inc(PendingSystemTail);
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if longint(PendingSystemTail)=longint(@PendingSystemEvent)+sizeof(PendingSystemEvent) then
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PendingSystemTail:=@PendingSystemEvent;
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inc(PendingSystemEvents);
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end;
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end;
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{$else HAS_SYSMSG}
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procedure InitSystemMsg;
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begin
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end;
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procedure DoneSystemMsg;
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begin
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end;
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procedure GetSystemEvent(var SystemEvent:TSystemEvent);
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begin
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FillChar(SystemEvent,SizeOf(SystemEvent),#0);
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end;
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function PollSystemEvent(var SystemEvent: TSystemEvent):boolean;
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begin
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FillChar(SystemEvent,SizeOf(SystemEvent),#0);
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PollSystemEvent:=false;
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end;
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procedure PutSystemEvent(const SystemEvent: TSystemEvent);
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begin
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end;
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{$endif not HAS_SYSMSG}
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end.
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