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{
System independent system interface for win32/win64
Copyright (c) 2000 by Pierre Muller
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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
}
uses
windows,dos,winevent;
var
ChangeSystemEvents : TCriticalSection;
Const
SystemEventActive : Boolean = false;
procedure SystemEventHandler(var ir:INPUT_RECORD);
var
e : TSystemEvent;
begin
{ WINDOW_BUFFER_SIZE_EVENT is triggered by buffer size changes
but we are interested in console size changes, thus its handled below
in PollSystemEvent }
if (ir.EventType in [FOCUS_EVENT{,WINDOW_BUFFER_SIZE_EVENT}]) then
begin
EnterCriticalSection(ChangeSystemEvents);
if (ir.EventType=FOCUS_EVENT) then
begin
if ir.Event.FocusEvent.bSetFocus then
e.typ:=SysSetFocus
else
e.typ:=SysReleaseFocus;
end
else
begin
e.typ:=SysResize;
e.x:=ir.Event.WindowBufferSizeEvent.dwSize.x;
e.y:=ir.Event.WindowBufferSizeEvent.dwSize.y;
end;
PutSystemEvent(e);
LeaveCriticalSection(ChangeSystemEvents);
end;
end;
var
Xsize, YSize : longint;
function HandleConsoleCtrl(typ : dword) : BOOL; stdcall;
var
SE : TSystemEvent;
begin
HandleConsoleCtrl:=false;
case typ of
CTRL_CLOSE_EVENT,
CTRL_LOGOFF_EVENT,
CTRL_SHUTDOWN_EVENT :
begin
SE.typ:=SysClose;
SE.CloseTyp:=typ;
PutSystemEvent(SE);
HandleConsoleCtrl:=true;
end;
end;
end;
procedure InitSystemMsg;
var
mode : dword;
ConsoleScreenBufferInfo : Console_screen_buffer_info;
begin
if SystemEventActive then
exit;
// enable Window events
GetConsoleMode(TextRec(Input).Handle,@mode);
mode:=mode or ENABLE_WINDOW_INPUT;
SetConsoleMode(TextRec(Input).Handle,mode);
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE),
@ConsoleScreenBufferInfo);
XSize:=ConsoleScreenBufferInfo.srWindow.right-ConsoleScreenBufferInfo.srWindow.left+1;
YSize:=ConsoleScreenBufferInfo.srWindow.bottom-ConsoleScreenBufferInfo.srWindow.top+1;
PendingSystemHead:=@PendingSystemEvent;
PendingSystemTail:=@PendingSystemEvent;
PendingSystemEvents:=0;
FillChar(LastSystemEvent,sizeof(TSystemEvent),0);
InitializeCriticalSection(ChangeSystemEvents);
SetResizeEventHandler(@SystemEventHandler);
SetFocusEventHandler(@SystemEventHandler);
SetConsoleCtrlHandler(@HandleConsoleCtrl,true);
SystemEventActive:=true;
end;
procedure DoneSystemMsg;
var
mode : dword;
begin
if not SystemEventActive then
exit;
// disable System events
GetConsoleMode(TextRec(Input).Handle,@mode);
mode:=mode and (not ENABLE_WINDOW_INPUT);
SetConsoleMode(TextRec(Input).Handle,mode);
SetResizeEventHandler(nil);
SetFocusEventHandler(nil);
DeleteCriticalSection(ChangeSystemEvents);
SetConsoleCtrlHandler(@HandleConsoleCtrl,false);
SystemEventActive:=false;
end;
procedure GetSystemEvent(var SystemEvent: TSystemEvent);
var
b : byte;
begin
repeat
EnterCriticalSection(ChangeSystemEvents);
b:=PendingSystemEvents;
LeaveCriticalSection(ChangeSystemEvents);
if b>0 then
break
else
sleep(50);
until false;
EnterCriticalSection(ChangeSystemEvents);
SystemEvent:=PendingSystemHead^;
inc(PendingSystemHead);
if longint(PendingSystemHead)=longint(@PendingSystemEvent)+sizeof(PendingSystemEvent) then
PendingSystemHead:=@PendingSystemEvent;
dec(PendingSystemEvents);
LastSystemEvent:=SystemEvent;
LeaveCriticalSection(ChangeSystemEvents);
end;
function PollSystemEvent(var SystemEvent: TSystemEvent):boolean;
var
ConsoleScreenBufferInfo : Console_screen_buffer_info;
NewXSize, NewYSize : longint;
begin
EnterCriticalSection(ChangeSystemEvents);
if PendingSystemEvents>0 then
begin
SystemEvent:=PendingSystemHead^;
PollSystemEvent:=true;
end
else
begin
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE),
@ConsoleScreenBufferInfo);
NewXSize:=ConsoleScreenBufferInfo.srWindow.right-ConsoleScreenBufferInfo.srWindow.left+1;
NewYSize:=ConsoleScreenBufferInfo.srWindow.bottom-ConsoleScreenBufferInfo.srWindow.top+1;
if (XSize<>NewXSize) or (YSize<>NewYSize) then
begin
SystemEvent.typ:=SysResize;
SystemEvent.x:=NewXSize;
SystemEvent.y:=NewYSize;
PutSystemEvent(SystemEvent);
XSize:=NewXSize;
YSize:=NewYSize;
PollSystemEvent:=true;
end
else
PollSystemEvent:=false;
end;
LeaveCriticalSection(ChangeSystemEvents);
end;
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