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implement Smenu;
include "sys.m";
sys: Sys;
include "draw.m";
include "tk.m";
tk: Tk;
include "smenu.m";
Scrollmenu.new(t: ref Tk->Toplevel, name: string, labs: array of string, e: int, o: int): ref Scrollmenu
{
if(sys == nil)
sys = load Sys Sys->PATH;
if(tk == nil)
tk = load Tk Tk->PATH;
m := ref Scrollmenu;
n := len labs;
if(n < e)
e = n;
if(o > n-e)
o = n-e;
l := 0;
for(i := 0; i < n; i++){
if(len labs[i] > l)
l = len labs[i];
i++;
}
nlabs := array[n] of string;
sp := string array[l] of { * => byte ' ' };
for(i = 0; i < n; i++)
nlabs[i] = labs[i] + sp[0: l - len labs[i]];
sch := cname(name);
cmd(t, "menu " + name);
for(i = 0; i < e; i++){
cmd(t, name + " add command -label {" + nlabs[o+i] + "} -command {send " + sch + " " + string i + "}");
}
# cmd(t, "bind " + name + " <ButtonPress-1> +{send " + sch + " b}");
# cmd(t, "bind " + name + " <ButtonRelease-1> +{send " + sch + " b}");
cmd(t, "bind " + name + " <Motion> +{send " + sch + " M %x %y}");
cmd(t, "bind " + name + " <Map> +{send " + sch + " m}");
cmd(t, "bind " + name + " <Unmap> +{send " + sch + " u}");
cmd(t, "update");
m.name = name;
m.labs = nlabs;
m.c = nil;
m.t = t;
m.m = e;
m.n = n;
m.o = o;
m.timer = 1;
return m;
}
Scrollmenu.post(m: self ref Scrollmenu, x: int, y: int, resc: chan of string, prefix: string)
{
sync := chan of int;
spawn listen(m, sync, resc, prefix);
<- sync;
cmd(m.t, m.name + " post " + string x + " " + string y);
cmd(m.t, "update");
}
Scrollmenu.destroy(m: self ref Scrollmenu)
{
if(m.c != nil){
m.c <-= "u"; # fake unmap message
m.c = nil;
}
m.name = nil;
m.labs = nil;
m.t = nil;
}
timer(t: int, sync: chan of int, c: chan of int)
{
sync <-= 0;
for(;;){
alt{
c <-= 0 =>
sys->sleep(t);
<- sync =>
exit;
}
}
}
TINT: con 100;
SEC: con 1000/TINT;
listen(m: ref Scrollmenu, sync: chan of int, resc: chan of string, prefix: string)
{
timerc := chan of int;
cmdc := chan of string;
m.c = cmdc;
tk->namechan(m.t, cmdc, cname(m.name));
sync <-= 0;
x := y := ly := w := h := -1;
for(;;){
alt{
<- timerc =>
if(x > 0 && x < w){
if(y < 0 && y > -h/m.m)
menudir(m, -1);
else if(y > 0+h && y < h+h/m.m)
menudir(m, 1);
}
s := <- cmdc =>
(nil, toks) := sys->tokenize(s, " ");
case hd toks{
"M" =>
x = int hd tl toks;
y = int hd tl tl toks;
if(!m.timer && x > 0 && x < w){
mv := 0;
if(y < ly && y < 0)
mv = y/(h/m.m)-1;
else if(y > ly && y > h)
mv = (y-h)/(h/m.m)+1;
if(mv != 0)
menudirs(m, mv);
ly = y;
}
"m" =>
w = int cmd(m.t, m.name + " cget -actwidth");
h = int cmd(m.t, m.name + " cget -actheight");
ly = -1;
if(m.timer){
spawn timer(TINT, sync, timerc);
<- sync;
}
"u" =>
if(m.timer)
sync <-= 0;
m.c = nil;
exit;
* =>
# do not block
res := prefix + string (int hd toks + m.o);
for(t := 0; t < SEC; ){
if(m.timer)
alt{
resc <-= res =>
t = SEC;
<- timerc =>
t++;
}
else
alt{
resc <-= res =>
t = SEC;
* =>
sys->sleep(TINT);
t++;
}
}
}
}
}
}
menudirs(sm: ref Scrollmenu, n: int)
{
if(n < 0)
(a, d) := (-n, -1);
else
(a, d) = (n, 1);
for(i := 0; i < a; i++)
menudir(sm, d);
}
menudir(sm: ref Scrollmenu, d: int)
{
o := sm.o;
n := sm.n;
m := sm.m;
if(d == -1){
if(o == 0)
return;
for(i := 0; i < m; i++)
cmd(sm.t, sm.name + " entryconfigure " + string i + " -label {" + sm.labs[o-1+i] + "}");
sm.o = o-1;
}
else{
if(o+m == n)
return;
for(i := 0; i < m; i++)
cmd(sm.t, sm.name + " entryconfigure " + string i + " -label {" + sm.labs[o+1+i] + "}");
sm.o = o+1;
}
cmd(sm.t, "update");
}
cname(s: string): string
{
return "sm_" + s + "_sm";
}
cmd(top: ref Tk->Toplevel, s: string): string
{
e := tk->cmd(top, s);
if (e != nil && e[0] == '!')
sys->fprint(sys->fildes(2), "Smenu: tk error on '%s': %s\n", s, e);
return e;
}
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