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{
System dependent system messages for AmigaOS/MorphOS
Copyright (c) 2008 by Karoly Balogh
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
}
uses
video;
Const
SystemEventActive : Boolean = false;
var
lastxsize,lastysize : longint;
procedure InitSystemMsg;
begin
If SystemEventActive then
exit;
{ Code to enable size tracking should go here }
PendingSystemHead:=@PendingSystemEvent;
PendingSystemTail:=@PendingSystemEvent;
PendingSystemEvents:=0;
FillChar(LastSystemEvent,sizeof(TSystemEvent),0);
Video.HasResizeWindow(LastXSize,LastYSize);
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 width, height : longint;
begin
SystemEvent.typ:=SysNothing;
if not SystemEventActive then
exit(false);
if PendingSystemEvents>0 then
begin
SystemEvent:=PendingSystemHead^;
PollSystemEvent:=true;
end
else
begin
PollSystemEvent:=false;
if Video.HasCloseWindow then begin
SystemEvent.typ:=SysClose;
SystemEvent.CloseTyp:=0;
PutSystemEvent(SystemEvent);
PollSystemEvent:=true;
end else if Video.HasResizeWindow(width, height) then begin
if (width>0) and (height>0) and
((width<>lastxsize) or (height<>lastysize)) then begin
SystemEvent.typ:=SysResize;
SystemEvent.x:=width;
SystemEvent.y:=height;
PutSystemEvent(SystemEvent);
LastXSize:=width;
LastYSize:=height;
PollSystemEvent:=true;
end;
end;
end;
end;
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