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{
Free Pascal port of the OpenPTC C++ library.
Copyright (C) 2001-2006, 2009, 2010 Nikolay Nikolov (nickysn@users.sourceforge.net)
Original C++ version by Glenn Fiedler (ptc@gaffer.org)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version
with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
constructor TDosMouse.Create(Width, Height: Integer);
begin
FWidth := Width;
FHeight := Height;
FPreviousMousePositionSaved := False;
mouse33h.InitMouse;
FMousePresent := mouse33h.MousePresent;
if FMousePresent then
begin
mouse33h.SetCursorRange(0, 0, FWidth - 1, FHeight - 1);
mouse33h.MoveMouseTo(FWidth div 2, FHeight div 2);
end;
end;
procedure TDosMouse.GetPendingEvents(queue: TEventQueue);
var
X, Y: Integer;
Left, Right, Middle: Boolean;
PTCMouseButtonState: TPTCMouseButtonState;
button: TPTCMouseButton;
before, after: Boolean;
cstate: TPTCMouseButtonState;
begin
if not FMousePresent then
exit;
mouse33h.ReadMouse(X, Y, Left, Right, Middle);
PTCMouseButtonState := [];
if Left then
PTCMouseButtonState := PTCMouseButtonState + [PTCMouseButton1];
if Right then
PTCMouseButtonState := PTCMouseButtonState + [PTCMouseButton2];
if Middle then
PTCMouseButtonState := PTCMouseButtonState + [PTCMouseButton3];
if X >= FWidth - 1 then
X := FWidth - 1;
if Y >= FHeight - 1 then
Y := FHeight - 1;
if X <= 0 then
X := 0;
if Y <= 0 then
Y := 0;
{ has something new happened? }
if (not FPreviousMousePositionSaved) or
(X <> FPreviousMouseX) or (Y <> FPreviousMouseY) or
(PTCMouseButtonState <> FPreviousMouseButtonState) then
begin
if not FPreviousMousePositionSaved then
begin
FPreviousMouseX := X; { first DeltaX will be 0 }
FPreviousMouseY := Y; { first DeltaY will be 0 }
FPreviousMouseButtonState := [];
end;
{ movement? }
if (X <> FPreviousMouseX) or (Y <> FPreviousMouseY) then
queue.AddEvent(TPTCMouseEvent.Create(X, Y, X - FPreviousMouseX, Y - FPreviousMouseY, FPreviousMouseButtonState));
{ button presses/releases? }
cstate := FPreviousMouseButtonState;
for button := Low(button) to High(button) do
begin
before := button In FPreviousMouseButtonState;
after := button In PTCMouseButtonState;
if after and (not before) then
begin
{ button was pressed }
cstate := cstate + [button];
queue.AddEvent(TPTCMouseButtonEvent.Create(x, y, 0, 0, cstate, True, button));
end
else
if before and (not after) then
begin
{ button was released }
cstate := cstate - [button];
queue.AddEvent(TPTCMouseButtonEvent.Create(x, y, 0, 0, cstate, False, button));
end;
end;
FPreviousMouseX := X;
FPreviousMouseY := Y;
FPreviousMouseButtonState := PTCMouseButtonState;
FPreviousMousePositionSaved := True;
end;
end;
|
