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scrollable.c
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#include
"main.h"
void
scroll_draw
(
SCROLLABLE
*
s
,
int
x
,
int
y
,
int
width
,
int
height
)
{
uint32_t
c
=
s
->
content_height
;
uint32_t
h
=
height
,
m
,
dy
;
if
(
h
>=
c
) {
// If h(eight) > c(ontent height), don't draw anything.
return
;
}
else
{
m
=
(
h
*
h
) /
c
;
double
d
=
(
h
-
m
);
dy
=
(
s
->
d
*
d
)
+
0.5
;
}
y
+=
dy
;
x
+=
s
->
x
;
if
(!
s
->
left
) {
x
+=
width
-
SCROLL_WIDTH
;
}
drawalpha
(
BM_SCROLLHALFTOP
,
x
,
y
,
SCROLL_WIDTH
,
SCROLL_WIDTH
/
2
,
s
->
color
);
y
+=
SCROLL_WIDTH
/
2
;
int
y2
=
y
+
m
-
SCROLL_WIDTH
;
if
(
SCROLL_WIDTH
>
m
) {
y2
=
y
;
}
drawrect
(
x
,
y
,
x
+
SCROLL_WIDTH
,
y2
,
s
->
color
);
drawalpha
(
BM_SCROLLHALFBOT
,
x
,
y2
,
SCROLL_WIDTH
,
SCROLL_WIDTH
/
2
,
s
->
color
);
}
int
scroll_gety
(
SCROLLABLE
*
s
,
int
height
)
{
int
c
=
s
->
content_height
;
if
(
c
>
height
)
{
return
(
s
->
d
*
(
double
)(
c
-
height
))
+
0.5
;
}
return
0
;
}
_Bool
scroll_mmove
(
SCROLLABLE
*
s
,
int
UNUSED
(
px
),
int
UNUSED
(
py
),
int
width
,
int
height
,
int
x
,
int
y
,
int
UNUSED
(
dx
),
int
dy
)
{
_Bool
draw
=
0
;
_Bool
hit
=
inrect
(
x
,
y
,
s
->
left
?
0
: (
width
-
SCROLL_WIDTH
),
0
,
SCROLL_WIDTH
,
height
);
if
(
s
->
mouseover
!=
hit
)
{
s
->
mouseover
=
hit
;
draw
=
1
;
}
s
->
mouseover2
=
inrect
(
x
,
y
,
0
,
0
,
width
,
height
);
if
(
s
->
mousedown
)
{
uint32_t
c
=
s
->
content_height
;
uint32_t
h
=
height
;
if
(
c
>
h
)
{
uint32_t
m
=
(
h
*
h
) /
c
;
double
d
=
(
h
-
m
);
s
->
d
=
((
s
->
d
*
d
)
+
(
double
)
dy
) /
d
;
if
(
s
->
d
<
0.0
)
{
s
->
d
=
0.0
;
}
else
if
(
s
->
d
>=
1.0
)
{
s
->
d
=
1.0
;
}
draw
=
1
;
}
}
return
draw
;
}
_Bool
scroll_mdown
(
SCROLLABLE
*
s
)
{
if
(
s
->
mouseover
)
{
s
->
mousedown
=
1
;
return
1
;
}
return
0
;
}
_Bool
scroll_mright
(
SCROLLABLE
*
UNUSED
(
s
))
{
return
0
;
}
_Bool
scroll_mwheel
(
SCROLLABLE
*
s
,
int
height
,
double
d
)
{
if
(
s
->
mouseover2
)
{
uint32_t
c
=
s
->
content_height
;
uint32_t
h
=
height
;
if
(
c
>
h
)
{
uint32_t
m
=
(
h
*
h
) /
c
;
double
dd
=
(
h
-
m
);
s
->
d
-=
16.0
*
d
/
dd
;;
if
(
s
->
d
<
0.0
)
{
s
->
d
=
0.0
;
}
else
if
(
s
->
d
>=
1.0
)
{
s
->
d
=
1.0
;
}
return
1
;
}
}
return
0
;
}
_Bool
scroll_mup
(
SCROLLABLE
*
s
)
{
if
(
s
->
mousedown
)
{
s
->
mousedown
=
0
;
return
1
;
}
return
0
;
}
_Bool
scroll_mleave
(
SCROLLABLE
*
s
)
{
if
(
s
->
mouseover
)
{
s
->
mouseover
=
0
;
return
1
;
}
s
->
mouseover2
=
0
;
return
0
;
}
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