ref: 87d72e7e8614d96b4f61adae5fb05b0534231c4c
dir: /appl/collab/clients/poll.b/
implement Poll;
include "sys.m";
sys: Sys;
include "draw.m";
include "tk.m";
tk: Tk;
include "tkclient.m";
tkclient: Tkclient;
include "dialog.m";
dialog: Dialog;
include "arg.m";
Poll: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
Maxanswer: con 4;
contents := array[] of {
"frame .f",
"frame .a",
"radiobutton .a.a1 -state disabled -variable answer -value A -text {A} -command {send entry A}",
"radiobutton .a.a2 -state disabled -variable answer -value B -text {B} -command {send entry B}",
"radiobutton .a.a3 -state disabled -variable answer -value C -text {C} -command {send entry C}",
"radiobutton .a.a4 -state disabled -variable answer -value D -text {D} -command {send entry D}",
"pack .a.a1 -side top -fill x -expand 1",
"pack .a.a2 -side top -fill x -expand 1",
"pack .a.a3 -side top -fill x -expand 1",
"pack .a.a4 -side top -fill x -expand 1",
"pack .a -side top -fill both -expand 1",
"pack .f -side top -fill both",
};
dbcontents := array[] of {
"text .f.t -state disabled -wrap word -yscrollcommand {.f.sb set} -height 4h",
"scrollbar .f.sb -orient vertical -command {.f.t yview}",
"pack .f.sb -side left -fill y",
"pack .f.t -side left -fill both -expand 1",
};
usage()
{
sys->fprint(sys->fildes(2), "usage: poll [-d] [servicedir] pollname\n");
raise "fail:usage";
}
init(ctxt: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
tk = load Tk Tk->PATH;
tkclient = load Tkclient Tkclient->PATH;
dialog = load Dialog Dialog->PATH;
arg := load Arg Arg->PATH;
if(arg == nil){
sys->fprint(sys->fildes(2), "poll: can't load %s: %r\n", Arg->PATH);
raise "fail:load";
}
arg->init(args);
debug := 0;
while((ch := arg->opt()) != 0)
case ch {
'd' =>
debug = 1;
* =>
usage();
}
args = arg->argv();
arg = nil;
if(len args < 1)
usage();
sys->pctl(Sys->NEWPGRP, nil);
servicedir := "/n/remote/services";
if(len args == 2)
(servicedir, args) = (hd args, tl args);
pollname := hd args;
(cfd, dir, emsg) := opensvc(servicedir, "mpx", pollname);
if(cfd == nil){
sys->fprint(sys->fildes(2), "poll: can't access poll %s: %s\n", pollname, emsg);
raise "fail:error";
}
fd := sys->open(dir+"/leaf", Sys->ORDWR);
if(fd == nil){
sys->fprint(sys->fildes(2), "poll: can't open %s/leaf: %r\n", dir);
raise "fail:open";
}
tkclient->init();
dialog->init();
(frame, wmctl) := tkclient->toplevel(ctxt, nil, sys->sprint("Poll %s", pollname), Tkclient->Appl);
entry := chan of string;
tk->namechan(frame, entry, "entry");
tkcmds(frame, contents);
if(debug)
tkcmds(frame, dbcontents);
tkcmd(frame, "pack propagate . 0");
fittoscreen(frame);
tk->cmd(frame, "update");
tkclient->onscreen(frame, nil);
tkclient->startinput(frame, "kbd"::"ptr"::nil);
in := chan of string;
spawn reader(fd, in);
first := 1;
lastval := -1;
qno := -1;
for(;;)
alt{
s := <-frame.ctxt.kbd =>
tk->keyboard(frame, s);
s := <-frame.ctxt.ptr =>
tk->pointer(frame, *s);
s := <-frame.ctxt.ctl or
s = <-frame.wreq or
s = <-wmctl =>
tkclient->wmctl(frame, s);
msg := <-entry =>
if(fd == nil){
dialog->prompt(ctxt, frame.image, "error -fg red", "Error", "Lost connection to polling station", 0, "Dismiss"::nil);
break;
}
n := msg[0]-'A';
lastval = n;
selectonly(frame, n, Maxanswer, "disabled");
if(qno >= 0) {
# send our answer to the polling station
if(sys->fprint(fd, "%d %s", qno, msg) < 0){
sys->fprint(sys->fildes(2), "poll: write error: %r\n");
fd = nil;
}
qno = -1; # only one go at it
}
s := <-in =>
if(s != nil){
if(debug){
t := s;
if(!first)
t = "\n"+t;
first = 0;
tk->cmd(frame, ".f.t insert end '" + t);
tk->cmd(frame, ".f.t see end");
tk->cmd(frame, "update");
}
(nf, flds) := sys->tokenize(s, " ");
if(nf > 1 && hd flds == "error:"){
dialog->prompt(ctxt, frame.image, "error -fg red", "Error", sys->sprint("polling station reports: %s", s), 0, "Dismiss"::nil);
break;
}
if(nf < 4)
break;
# seq clientid op name data
op, name: string;
flds = tl flds; # ignore seq
flds = tl flds; # ignore clientid
(op, flds) = (hd flds, tl flds);
(name, flds) = (hd flds, tl flds);
case op {
"M" =>
# poll qno nanswer opt
# stop qno
selectonly(frame, -1, Maxanswer, "disabled");
if(len flds < 2)
break;
(op, flds) = (hd flds, tl flds);
(s, flds) = (hd flds, tl flds);
case op {
"poll" =>
qno = int s;
(s, flds) = (hd flds, tl flds);
n := int s;
if(n > Maxanswer)
n = Maxanswer;
if(n < 2)
n = 2;
selectonly(frame, -1, n, "normal");
lastval = -1;
"stop" =>
selectonly(frame, lastval, Maxanswer, "disabled");
}
"L" =>
dialog->prompt(ctxt, frame.image, "error -fg red", "Notice", sys->sprint("Poller (%s) has gone", name), 0, "Exit"::nil);
tkclient->wmctl(frame, "exit");
}
}else{
dialog->prompt(ctxt, frame.image, "error -fg red", "Notice", "Polling station closed", 0, "Exit"::nil);
tkclient->wmctl(frame, "exit");
}
}
}
selectonly(t: ref Tk->Toplevel, n: int, top: int, state: string)
{
for(i := 0; i < top; i++){
path := sys->sprint(".a.a%d", i+1);
if(i != n)
tkcmd(t, path+" deselect");
else
tkcmd(t, path+" select");
tkcmd(t, path+" configure -state "+state);
}
tk->cmd(t, "update");
}
reader(fd: ref Sys->FD, c: chan of string)
{
buf := array[Sys->ATOMICIO] of byte;
while((n := sys->read(fd, buf, len buf)) > 0)
c <-= string buf[0:n];
if(n < 0)
c <-= sys->sprint("error: %r");
c <-= nil;
}
opensvc(dir: string, svc: string, name: string): (ref Sys->FD, string, string)
{
ctlfd := sys->open(dir+"/ctl", Sys->ORDWR);
if(ctlfd == nil)
return (nil, nil, sys->sprint("can't open %s/ctl: %r", dir));
if(sys->fprint(ctlfd, "%s %s", svc, name) <= 0)
return (nil, nil, sys->sprint("can't access %s service %s: %r", svc, name));
buf := array [32] of byte;
sys->seek(ctlfd, big 0, Sys->SEEKSTART);
n := sys->read(ctlfd, buf, len buf);
if (n <= 0)
return (nil, nil, sys->sprint("%s/ctl: protocol error: %r", dir));
return (ctlfd, dir+"/"+string buf[0:n], nil);
}
tkcmds(t: ref Tk->Toplevel, cmds: array of string)
{
for (i := 0; i < len cmds; i++)
tkcmd(t, cmds[i]);
}
tkcmd(t: ref Tk->Toplevel, cmd: string): string
{
s := tk->cmd(t, cmd);
if (s != nil && s[0] == '!')
sys->fprint(sys->fildes(2), "poll: tk error: %s [%s]\n", s, cmd);
return s;
}
fittoscreen(win: ref Tk->Toplevel)
{
draw := load Draw Draw->PATH;
Point, Rect: import draw;
if (win.image == nil || win.image.screen == nil)
return;
r := win.image.screen.image.r;
scrsize := Point((r.max.x - r.min.x), (r.max.y - r.min.y));
bd := int tkcmd(win, ". cget -bd");
winsize := Point(int tkcmd(win, ". cget -actwidth") + bd * 2, int tkcmd(win, ". cget -actheight") + bd * 2);
if (winsize.x > scrsize.x)
tkcmd(win, ". configure -width " + string (scrsize.x - bd * 2));
if (winsize.y > scrsize.y)
tkcmd(win, ". configure -height " + string (scrsize.y - bd * 2));
actr: Rect;
actr.min = Point(int tkcmd(win, ". cget -actx"), int tkcmd(win, ". cget -acty"));
actr.max = actr.min.add((int tkcmd(win, ". cget -actwidth") + bd*2,
int tkcmd(win, ". cget -actheight") + bd*2));
(dx, dy) := (actr.dx(), actr.dy());
if (actr.max.x > r.max.x)
(actr.min.x, actr.max.x) = (r.min.x - dx, r.max.x - dx);
if (actr.max.y > r.max.y)
(actr.min.y, actr.max.y) = (r.min.y - dy, r.max.y - dy);
if (actr.min.x < r.min.x)
(actr.min.x, actr.max.x) = (r.min.x, r.min.x + dx);
if (actr.min.y < r.min.y)
(actr.min.y, actr.max.y) = (r.min.y, r.min.y + dy);
tkcmd(win, ". configure -x " + string actr.min.x + " -y " + string actr.min.y);
}