<s>
fpGUI	B-Language
,	O
the	O
Free	B-Operating_System
Pascal	I-Operating_System
GUI	B-Library
toolkit	I-Library
,	O
is	O
a	O
cross-platform	B-Operating_System
graphical	B-Library
user	I-Library
interface	I-Library
toolkit	I-Library
developed	O
by	O
Graeme	O
Geldenhuys	O
.	O
</s>
<s>
fpGUI	B-Language
is	O
open	B-Application
source	I-Application
and	O
free	B-Application
software	I-Application
,	O
licensed	O
under	O
a	O
Modified	O
LGPL	B-Application
license	I-Application
.	O
</s>
<s>
The	O
toolkit	O
has	O
been	O
implemented	O
using	O
the	O
Free	B-Operating_System
Pascal	I-Operating_System
compiler	I-Operating_System
,	O
meaning	O
it	O
is	O
written	O
in	O
the	O
Object	B-Language
Pascal	I-Language
language	O
.	O
</s>
<s>
fpGUI	B-Language
consists	O
only	O
of	O
graphical	O
widgets	O
or	O
components	O
,	O
and	O
a	O
cross-platform	B-Operating_System
2D	O
drawing	O
library	O
.	O
</s>
<s>
It	O
also	O
does	O
n't	O
rely	O
on	O
any	O
huge	O
third	O
party	O
libraries	O
like	O
GTK	B-Application
or	O
Qt	B-Language
.	O
</s>
<s>
All	O
the	O
extras	O
come	O
straight	O
from	O
what	O
is	O
available	O
with	O
the	O
Free	B-Operating_System
Pascal	I-Operating_System
Component	O
Library	O
(	O
FCL	O
)	O
which	O
comes	O
standard	O
with	O
the	O
Free	B-Operating_System
Pascal	I-Operating_System
compiler	I-Operating_System
.	O
</s>
<s>
The	O
first	O
version	O
of	O
fpGUI	B-Language
was	O
written	O
by	O
Sebastian	O
Günther	O
back	O
in	O
2000	O
.	O
</s>
<s>
The	O
project	O
was	O
then	O
abandoned	O
in	O
2002	O
.	O
fpGUI	B-Language
was	O
a	O
successor	O
to	O
an	O
earlier	O
OO	O
GTK	B-Application
wrapper	O
,	O
fpGTK	O
,	O
and	O
was	O
pretty	O
much	O
a	O
fresh	O
start	O
to	O
allow	O
multiple	O
(	O
backend	O
)	O
widgetsets	O
,	O
most	O
notably	O
win32	O
.	O
</s>
<s>
Most	O
of	O
these	O
tools	O
where	O
migrated	O
to	O
the	O
maturing	O
Lazarus	B-Language
in	O
the	O
2004-2006	O
timeframe	O
.	O
</s>
<s>
Merging	O
three	O
sub-projects	O
(	O
fpGFX	O
,	O
fpIMG	O
and	O
fpGUI	B-Language
)	O
into	O
a	O
single	O
project	O
fpGUI	B-Language
.	O
</s>
<s>
The	O
supported	O
platforms	O
at	O
that	O
stage	O
was	O
Linux	B-Application
and	O
FreeBSD	B-Operating_System
via	O
X11	B-Operating_System
and	O
Microsoft	B-Application
Windows	I-Application
via	O
GDI	O
.	O
</s>
<s>
After	O
a	O
few	O
months	O
Felipe	O
Monteiro	O
de	O
Carvalho	O
joined	O
the	O
development	O
team	O
adding	O
support	O
for	O
Windows	B-Application
Mobile	O
devices	O
and	O
extending	O
the	O
graphics	O
support	O
and	O
design	O
.	O
</s>
<s>
Felipe	O
also	O
started	O
working	O
on	O
Mac	O
OS	O
X	B-Operating_System
support	O
via	O
Carbon	O
.	O
</s>
<s>
This	O
prevented	O
fpGUI	B-Language
from	O
being	O
truly	O
useful	O
in	O
real	O
applications	O
.	O
</s>
<s>
After	O
numerous	O
prototypes	O
the	O
fpGUI	B-Language
project	O
was	O
completely	O
rewritten	O
.	O
</s>
<s>
Other	O
GUI	B-Library
toolkits	I-Library
that	O
follow	O
a	O
similar	O
design	O
are	O
GTK	B-Application
,	O
Xt	B-Language
and	O
FLTK	B-Language
to	O
name	O
a	O
few	O
.	O
</s>
<s>
GUI	B-Library
toolkits	I-Library
that	O
follow	O
the	O
opposite	O
design	O
are	O
toolkits	O
like	O
the	O
latest	O
Qt	B-Language
and	O
MSEgui	O
.	O
</s>
<s>
On	O
the	O
canvas	O
(	O
background	O
)	O
of	O
the	O
window	O
it	O
paints	O
all	O
the	O
standard	O
built-in	O
images	O
used	O
with	O
fpGUI	B-Language
.	O
</s>
<s>
Here	O
is	O
a	O
screenshot	O
of	O
the	O
above	O
program	O
when	O
run	O
under	O
Linux	B-Application
.	O
</s>
<s>
fpGUI	B-Language
is	O
statically	O
linked	O
into	O
programs	O
and	O
is	O
licensed	O
using	O
a	O
modified	O
version	O
of	O
LGPL	B-Application
specially	O
designed	O
to	O
allow	O
static	O
linking	O
to	O
proprietary	O
programs	O
.	O
</s>
<s>
The	O
only	O
code	O
you	O
need	O
to	O
make	O
available	O
are	O
any	O
changes	O
you	O
made	O
to	O
the	O
fpGUI	B-Language
toolkit	O
-	O
nothing	O
more	O
.	O
</s>
<s>
A	O
Visual	O
Form	O
Designer	O
which	O
is	O
now	O
included	O
as	O
part	O
of	O
fpGUI	B-Language
.	O
</s>
<s>
fpGUI	B-Language
DocViewAn	O
INF	B-Language
help	I-Language
file	I-Language
viewer	O
that	O
currently	O
works	O
on	O
Windows	B-Application
,	O
Linux	B-Application
and	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
INF	O
is	O
the	O
default	O
help	O
format	O
of	O
fpGUI	B-Language
,	O
and	O
is	O
also	O
the	O
help	O
format	O
used	O
in	O
OS/2	B-Application
(	O
and	O
also	O
eComStation	B-Device
and	O
ArcaOS	B-Device
)	O
.	O
</s>
<s>
A	O
cross-platform	B-Operating_System
unit	O
testing	O
framework	O
with	O
a	O
Console	O
and	O
GUI	B-Application
test	O
runner	O
.	O
</s>
