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mouse: Make /dev/mousein readable to get mouse status without blocking

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There is currently no way to get the current mouse position
and button states without blocking.
This commit is contained in:
cinap_lenrek 2023-01-01 18:37:08 +00:00
parent ba66d8f69e
commit 705885553c
2 changed files with 45 additions and 16 deletions
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21
sys/man/3/mouse
View file

@ -56,23 +56,30 @@ Writes to the
.B mousein
file are processed as if they were generated by the
mouse hardware itself,
as extra mouse events to be processed and passed back via
the
as extra mouse events to be processed and passed back via the
.B mouse
file.
Reading the
.B mousein
file returns the current mouse status without waiting.
The
.B mousein
file, which may be opened
only by the host owner, is intended for controlling devices, such as USB mice,
only by the host owner, is intended for controlling devices,
such as USB mice and tablets,
that are managed by user-level software.
Each event should consist of
the letter
.B m
followed by delta
.IR x ,
delta
.IR y ,
(for relative delta coordinates)
or
.B A
(for absolute screen coordinates)
followed by the
.I x
and
.I y
coordinates and
.IR buttons
as space-separated decimal numbers.
.PP

40
sys/src/9/port/devmouse.c
View file

@ -88,7 +88,7 @@ static Dirtab mousedir[]={
".", {Qdir, 0, QTDIR}, 0, DMDIR|0555,
"cursor", {Qcursor}, 0, 0666,
"mouse", {Qmouse}, 0, 0666,
"mousein", {Qmousein}, 0, 0220,
"mousein", {Qmousein}, 0, 0660,
"mousectl", {Qmousectl}, 0, 0220,
};
@ -207,7 +207,9 @@ mouseclose(Chan *c)
return;
switch((ulong)c->qid.path){
case Qmousein:
ilock(&mouse);
mouse.inbuttons &= ~((Mousestate*)c->aux)->buttons;
iunlock(&mouse);
free(c->aux); /* Mousestate */
c->aux = nil;
return;
@ -232,6 +234,7 @@ mouseread(Chan *c, void *va, long n, vlong off)
Cursor curs;
Mousestate m;
int b;
char t;
p = va;
switch((ulong)c->qid.path){
@ -272,23 +275,39 @@ mouseread(Chan *c, void *va, long n, vlong off)
m = mouse.Mousestate;
iunlock(&mouse);
if(0){
case Qmousein:
if(offset != 0)
return 0;
ilock(&mouse);
m = mouse.Mousestate;
iunlock(&mouse);
t = 'm';
} else {
/* Qmouse */
mouse.lastcounter = m.counter;
if(mouse.resize){
mouse.resize = 0;
t = 'r';
} else {
t = 'm';
}
}
b = buttonmap[m.buttons&7];
/* put buttons 4 and 5 back in */
b |= m.buttons & (3<<3);
if (scrollswap)
if (b == 8)
b = 16;
else if (b == 16)
b = 8;
sprint(buf, "m%11d %11d %11d %11ld ",
m.xy.x, m.xy.y, b, m.msec);
mouse.lastcounter = m.counter;
if(mouse.resize){
mouse.resize = 0;
buf[0] = 'r';
}
snprint(buf, sizeof(buf), "%c%11d %11d %11d %11ld ",
t, m.xy.x, m.xy.y, b, m.msec);
if(n > 1+4*12)
n = 1+4*12;
memmove(va, buf, n);
@ -446,8 +465,11 @@ mousewrite(Chan *c, void *va, long n, vlong)
m->msec = msec;
b ^= m->buttons;
m->buttons ^= b;
ilock(&mouse);
mouse.inbuttons = (m->buttons & b) | (mouse.inbuttons & ~b);
b = mouse.buttons & ~b;
iunlock(&mouse);
/* include wheel */
b &= ~(8|16);