ref: df03eca7e7cbfadf1cf8c8c5a94390eaa5013a8b
dir: /appl/lib/wmsrv.b/
implement Wmsrv;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Display, Image, Point, Rect, Screen, Pointer, Context, Wmcontext: import draw;
include "wmsrv.m";
zorder: ref Client; # top of z-order list, linked by znext.
ZR: con Rect((0, 0), (0, 0));
Iqueue: adt {
h, t: list of int;
n: int;
put: fn(q: self ref Iqueue, s: int);
get: fn(q: self ref Iqueue): int;
peek: fn(q: self ref Iqueue): int;
nonempty: fn(q: self ref Iqueue): int;
};
Squeue: adt {
h, t: list of string;
n: int;
put: fn(q: self ref Squeue, s: string);
get: fn(q: self ref Squeue): string;
peek: fn(q: self ref Squeue): string;
nonempty: fn(q: self ref Squeue): int;
};
# Ptrqueue is the same as the other queues except it merges events
# that have the same button state.
Ptrqueue: adt {
last: ref Pointer;
h, t: list of ref Pointer;
put: fn(q: self ref Ptrqueue, s: ref Pointer);
get: fn(q: self ref Ptrqueue): ref Pointer;
peek: fn(q: self ref Ptrqueue): ref Pointer;
nonempty: fn(q: self ref Ptrqueue): int;
flush: fn(q: self ref Ptrqueue);
};
init(): (chan of (string, chan of (string, ref Wmcontext)),
chan of (ref Client, chan of string),
chan of (ref Client, array of byte, Sys->Rwrite))
{
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
sys->bind("#s", "/chan", Sys->MBEFORE);
ctlio := sys->file2chan("/chan", "wmctl");
if(ctlio == nil){
sys->werrstr(sys->sprint("can't create /chan/wmctl: %r"));
return (nil, nil, nil);
}
wmreq := chan of (string, chan of (string, ref Wmcontext));
join := chan of (ref Client, chan of string);
req := chan of (ref Client, array of byte, Sys->Rwrite);
spawn wm(ctlio, wmreq, join, req);
return (wmreq, join, req);
}
wm(ctlio: ref Sys->FileIO,
wmreq: chan of (string, chan of (string, ref Wmcontext)),
join: chan of (ref Client, chan of string),
req: chan of (ref Client, array of byte, Sys->Rwrite))
{
clients: array of ref Client;
for(;;)alt{
(cmd, rc) := <-wmreq =>
token := int cmd;
for(i := 0; i < len clients; i++)
if(clients[i] != nil && clients[i].token == token)
break;
if(i == len clients){
spawn senderror(rc, "not found");
break;
}
c := clients[i];
if(c.stop != nil){
spawn senderror(rc, "already started");
break;
}
ok := chan of string;
join <-= (c, ok);
if((e := <-ok) != nil){
spawn senderror(rc, e);
break;
}
c.stop = chan of int;
spawn childminder(c, rc);
(nil, nbytes, fid, rc) := <-ctlio.read =>
if(rc == nil)
break;
c := findfid(clients, fid);
if(c == nil){
c = ref Client(
chan of int,
chan of ref Draw->Pointer,
chan of string,
nil,
0,
nil,
nil,
nil,
chan of (ref Point, ref Image, chan of int),
-1,
fid,
fid, # token; XXX could be random integer + fid
newwmcontext()
);
clients = addclient(clients, c);
}
alt{
rc <-= (sys->aprint("%d", c.token), nil) => ;
* => ;
}
(nil, data, fid, wc) := <-ctlio.write =>
c := findfid(clients, fid);
if(wc != nil){
if(c == nil){
alt{
wc <-= (0, "must read first") => ;
* => ;
}
break;
}
req <-= (c, data, wc);
}else if(c != nil){
req <-= (c, nil, nil);
delclient(clients, c);
}
}
}
# buffer all events between a window manager and
# a client, so that one recalcitrant child can't
# clog the whole system.
childminder(c: ref Client, rc: chan of (string, ref Wmcontext))
{
wmctxt := c.wmctxt;
dummykbd := chan of int;
dummyptr := chan of ref Pointer;
dummyimg := chan of ref Image;
dummyctl := chan of string;
kbdq := ref Iqueue;
ptrq := ref Ptrqueue;
ctlq := ref Squeue;
Imgnone, Imgsend, Imgsendnil1, Imgsendnil2, Imgorigin: con iota;
img, sendimg: ref Image;
imgorigin: Point;
imgstate := Imgnone;
# send reply to client, but make sure we don't block.
Reply:
for(;;) alt{
rc <-= (nil, ref *wmctxt) =>
break Reply;
<-c.stop =>
exit;
key := <-c.kbd =>
kbdq.put(key);
ptr := <-c.ptr =>
ptrq.put(ptr);
ctl := <-c.ctl =>
ctlq.put(ctl);
}
for(;;){
outkbd := dummykbd;
key := -1;
if(kbdq.nonempty()){
key = kbdq.peek();
outkbd = wmctxt.kbd;
}
outptr := dummyptr;
ptr: ref Pointer;
if(ptrq.nonempty()){
ptr = ptrq.peek();
outptr = wmctxt.ptr;
}
outctl := dummyctl;
ctl: string;
if(ctlq.nonempty()){
ctl = ctlq.peek();
outctl = wmctxt.ctl;
}
outimg := dummyimg;
case imgstate{
Imgsend =>
outimg = wmctxt.images;
sendimg = img;
Imgsendnil1 or
Imgsendnil2 or
Imgorigin =>
outimg = wmctxt.images;
sendimg = nil;
}
alt{
outkbd <-= key =>
kbdq.get();
outptr <-= ptr =>
ptrq.get();
outctl <-= ctl =>
ctlq.get();
outimg <-= sendimg =>
case imgstate{
Imgsend =>
imgstate = Imgnone;
img = sendimg = nil;
Imgsendnil1 =>
imgstate = Imgsendnil2;
Imgsendnil2 =>
imgstate = Imgnone;
Imgorigin =>
if(img.origin(imgorigin, imgorigin) == -1){
# XXX what can we do about this? there's no way at the moment
# of getting the information about the origin failure back to the wm,
# so we end up with an inconsistent window position.
# if the window manager blocks while we got the sync from
# the client, then a client could block the whole window manager
# which is what we're trying to avoid.
# but there's no other time we could set the origin of the window,
# and not risk mucking up the window contents.
# the short answer is that running out of image space is Bad News.
}
imgstate = Imgsend;
}
# XXX could mark the application as unresponding if any of these queues
# start growing too much.
ch := <-c.kbd =>
kbdq.put(ch);
p := <-c.ptr =>
if(p == nil)
ptrq.flush();
else
ptrq.put(p);
e := <-c.ctl =>
ctlq.put(e);
(o, i, reply) := <-c.images =>
# can't queue multiple image requests.
if(imgstate != Imgnone)
reply <-= -1;
else {
# if the origin is being set, then we first send a nil image
# to indicate that this is happening, and then the
# image itself (reorigined).
# if a nil image is being set, then we
# send nil twice.
if(o != nil){
imgorigin = *o;
imgstate = Imgorigin;
img = i;
}else if(i != nil){
img = i;
imgstate = Imgsend;
}else
imgstate = Imgsendnil1;
reply <-= 0;
}
<-c.stop =>
# XXX do we need to unblock channels, kill, etc.?
# we should perhaps drain the ctl output channel here
# if possible, exiting if it times out.
exit;
}
}
}
findfid(clients: array of ref Client, fid: int): ref Client
{
for(i := 0; i < len clients; i++)
if(clients[i] != nil && clients[i].fid == fid)
return clients[i];
return nil;
}
addclient(clients: array of ref Client, c: ref Client): array of ref Client
{
for(i := 0; i < len clients; i++)
if(clients[i] == nil){
clients[i] = c;
c.id = i;
return clients;
}
nc := array[len clients + 4] of ref Client;
nc[0:] = clients;
nc[len clients] = c;
c.id = len clients;
return nc;
}
delclient(clients: array of ref Client, c: ref Client)
{
clients[c.id] = nil;
}
senderror(rc: chan of (string, ref Wmcontext), e: string)
{
rc <-= (e, nil);
}
Client.window(c: self ref Client, tag: string): ref Window
{
for (w := c.wins; w != nil; w = tl w)
if((hd w).tag == tag)
return hd w;
return nil;
}
Client.image(c: self ref Client, tag: string): ref Draw->Image
{
w := c.window(tag);
if(w != nil)
return w.img;
return nil;
}
Client.setimage(c: self ref Client, tag: string, img: ref Draw->Image): int
{
# if img is nil, remove window from list.
if(img == nil){
# usual case:
if(c.wins != nil && (hd c.wins).tag == tag){
c.wins = tl c.wins;
return -1;
}
nw: list of ref Window;
for (w := c.wins; w != nil; w = tl w)
if((hd w).tag != tag)
nw = hd w :: nw;
c.wins = nil;
for(; nw != nil; nw = tl nw)
c.wins = hd nw :: c.wins;
return -1;
}
for(w := c.wins; w != nil; w = tl w)
if((hd w).tag == tag)
break;
win: ref Window;
if(w != nil)
win = hd w;
else{
win = ref Window(tag, ZR, nil);
c.wins = win :: c.wins;
}
win.img = img;
win.r = img.r; # save so clients can set logical origin
rc := chan of int;
c.images <-= (nil, img, rc);
return <-rc;
}
# tell a client about a window that's moved to screen coord o.
Client.setorigin(c: self ref Client, tag: string, o: Draw->Point): int
{
w := c.window(tag);
if(w == nil)
return -1;
img := w.img;
if(img == nil)
return -1;
rc := chan of int;
c.images <-= (ref o, w.img, rc);
if(<-rc != -1){
w.r = (o, o.add(img.r.size()));
return 0;
}
return -1;
}
clientimages(c: ref Client): array of ref Image
{
a := array[len c.wins] of ref Draw->Image;
i := 0;
for(w := c.wins; w != nil; w = tl w)
if((hd w).img != nil)
a[i++] = (hd w).img;
return a[0:i];
}
Client.top(c: self ref Client)
{
imgs := clientimages(c);
if(len imgs > 0)
imgs[0].screen.top(imgs);
if(zorder == c)
return;
prev: ref Client;
for(z := zorder; z != nil; (prev, z) = (z, z.znext))
if(z == c)
break;
if(prev != nil)
prev.znext = c.znext;
c.znext = zorder;
zorder = c;
}
Client.bottom(c: self ref Client)
{
if(c.znext == nil)
return;
imgs := clientimages(c);
if(len imgs > 0)
imgs[0].screen.bottom(imgs);
prev: ref Client;
for(z := zorder; z != nil; (prev, z) = (z, z.znext))
if(z == c)
break;
if(prev != nil)
prev.znext = c.znext;
else
zorder = c.znext;
z = c.znext;
c.znext = nil;
for(; z != nil; (prev, z) = (z, z.znext))
;
if(prev != nil)
prev.znext = c;
else
zorder = c;
}
Client.hide(nil: self ref Client)
{
}
Client.unhide(nil: self ref Client)
{
}
Client.remove(c: self ref Client)
{
prev: ref Client;
for(z := zorder; z != nil; (prev, z) = (z, z.znext))
if(z == c)
break;
if(z == nil)
return;
if(prev != nil)
prev.znext = z.znext;
else if(z != nil)
zorder = zorder.znext;
}
find(p: Draw->Point): ref Client
{
for(z := zorder; z != nil; z = z.znext)
if(z.contains(p))
return z;
return nil;
}
top(): ref Client
{
return zorder;
}
Client.contains(c: self ref Client, p: Point): int
{
for(w := c.wins; w != nil; w = tl w)
if((hd w).r.contains(p))
return 1;
return 0;
}
r2s(r: Rect): string
{
return string r.min.x + " " + string r.min.y + " " +
string r.max.x + " " + string r.max.y;
}
newwmcontext(): ref Wmcontext
{
return ref Wmcontext(
chan of int,
chan of ref Pointer,
chan of string,
nil,
chan of ref Image,
nil,
nil
);
}
Iqueue.put(q: self ref Iqueue, s: int)
{
q.t = s :: q.t;
}
Iqueue.get(q: self ref Iqueue): int
{
s := -1;
if(q.h == nil){
for(t := q.t; t != nil; t = tl t)
q.h = hd t :: q.h;
q.t = nil;
}
if(q.h != nil){
s = hd q.h;
q.h = tl q.h;
}
return s;
}
Iqueue.peek(q: self ref Iqueue): int
{
s := -1;
if (q.h == nil && q.t == nil)
return s;
s = q.get();
q.h = s :: q.h;
return s;
}
Iqueue.nonempty(q: self ref Iqueue): int
{
return q.h != nil || q.t != nil;
}
Squeue.put(q: self ref Squeue, s: string)
{
q.t = s :: q.t;
}
Squeue.get(q: self ref Squeue): string
{
s: string;
if(q.h == nil){
for(t := q.t; t != nil; t = tl t)
q.h = hd t :: q.h;
q.t = nil;
}
if(q.h != nil){
s = hd q.h;
q.h = tl q.h;
}
return s;
}
Squeue.peek(q: self ref Squeue): string
{
s: string;
if (q.h == nil && q.t == nil)
return s;
s = q.get();
q.h = s :: q.h;
return s;
}
Squeue.nonempty(q: self ref Squeue): int
{
return q.h != nil || q.t != nil;
}
Ptrqueue.put(q: self ref Ptrqueue, s: ref Pointer)
{
if(q.last != nil && s.buttons == q.last.buttons)
*q.last = *s;
else{
q.t = s :: q.t;
q.last = s;
}
}
Ptrqueue.get(q: self ref Ptrqueue): ref Pointer
{
s: ref Pointer;
h := q.h;
if(h == nil){
for(t := q.t; t != nil; t = tl t)
h = hd t :: h;
q.t = nil;
}
if(h != nil){
s = hd h;
h = tl h;
if(h == nil)
q.last = nil;
}
q.h = h;
return s;
}
Ptrqueue.peek(q: self ref Ptrqueue): ref Pointer
{
s: ref Pointer;
if (q.h == nil && q.t == nil)
return s;
t := q.last;
s = q.get();
q.h = s :: q.h;
q.last = t;
return s;
}
Ptrqueue.nonempty(q: self ref Ptrqueue): int
{
return q.h != nil || q.t != nil;
}
Ptrqueue.flush(q: self ref Ptrqueue)
{
q.h = q.t = nil;
}