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{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Florian Klaempfl
member of the Free Pascal development team
This is unit implements some of the crt functionality
for the gui win32 graph unit implementation
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program 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.
**********************************************************************}
unit wincrt;
interface
function readkey : char;
function keypressed : boolean;
procedure delay(ms : word);
{ dummy }
procedure textmode(mode : integer);
{ plays the windows standard sound }
{ hz is ignored (at least on win95 }
procedure sound(hz : word);
{ dummy }
procedure nosound;
var
directvideo : boolean;
{ dummy }
lastmode : word;
implementation
uses
windows,graph;
const
keybuffersize = 32;
var
keyboardhandling : TCriticalSection;
keybuffer : array[1..keybuffersize] of char;
nextfree,nexttoread : longint;
procedure inccyclic(var i : longint);
begin
inc(i);
if i>keybuffersize then
i:=1;
end;
procedure addchar(c : char);
begin
EnterCriticalSection(keyboardhandling);
keybuffer[nextfree]:=c;
inccyclic(nextfree);
{ skip old chars }
if nexttoread=nextfree then
begin
// special keys are started by #0
// so we've to remove two chars
if keybuffer[nexttoread]=#0 then
inccyclic(nexttoread);
inccyclic(nexttoread);
end;
LeaveCriticalSection(keyboardhandling);
end;
function readkey : char;
begin
while true do
begin
EnterCriticalSection(keyboardhandling);
if nexttoread<>nextfree then
begin
readkey:=keybuffer[nexttoread];
inccyclic(nexttoread);
LeaveCriticalSection(keyboardhandling);
exit;
end;
LeaveCriticalSection(keyboardhandling);
{ give other threads a chance }
Windows.Sleep(10);
end;
end;
function keypressed : boolean;
begin
EnterCriticalSection(keyboardhandling);
keypressed:=nexttoread<>nextfree;
LeaveCriticalSection(keyboardhandling);
end;
procedure delay(ms : word);
begin
Sleep(ms);
end;
procedure textmode(mode : integer);
begin
end;
procedure sound(hz : word);
begin
Windows.Beep(hz,500);
end;
procedure nosound;
begin
end;
procedure addextchar(c : char);
begin
addchar(#0);
addchar(c);
end;
const
altkey : boolean = false;
ctrlkey : boolean = false;
shiftkey : boolean = false;
function msghandler(Window: HWnd; AMessage:UInt; WParam : WParam; LParam: LParam): LResult; stdcall;
begin
case amessage of
WM_CHAR:
begin
addchar(chr(wparam));
end;
WM_KEYDOWN:
begin
case wparam of
VK_LEFT:
addextchar(#75);
VK_RIGHT:
addextchar(#77);
VK_DOWN:
addextchar(#80);
VK_UP:
addextchar(#72);
VK_INSERT:
addextchar(#82);
VK_DELETE:
addextchar(#83);
VK_END:
addextchar(#79);
VK_HOME:
addextchar(#71);
VK_PRIOR:
addextchar(#73);
VK_NEXT:
addextchar(#81);
VK_F1..VK_F10:
begin
if ctrlkey then
addextchar(chr(wparam+24))
else if altkey then
addextchar(chr(wparam+34))
else
addextchar(chr(wparam-11));
end;
VK_CONTROL:
ctrlkey:=true;
VK_MENU:
altkey:=true;
VK_SHIFT:
shiftkey:=true;
end;
end;
WM_KEYUP:
begin
case wparam of
VK_CONTROL:
ctrlkey:=false;
VK_MENU:
altkey:=false;
VK_SHIFT:
shiftkey:=false;
end;
end;
end;
msghandler:=0;
end;
var
oldexitproc : pointer;
procedure myexitproc;
begin
exitproc:=oldexitproc;
charmessagehandler:=nil;
DeleteCriticalSection(keyboardhandling);
end;
begin
charmessagehandler:=@msghandler;
nextfree:=1;
nexttoread:=1;
InitializeCriticalSection(keyboardhandling);
oldexitproc:=exitproc;
exitproc:=@myexitproc;
lastmode:=0;
end.
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