ref: f5cc6fbe3a7bcf8bdb002c646ddd519014afafd2
dir: /appl/wm/ftree/items.b/
implement Items;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Point, Rect: import draw;
include "tk.m";
tk: Tk;
include "items.m";
Taglen: con 5;
Titletaglen: con 10;
Spotdiam: con 10;
Lineopts: con " -width 1 -fill gray";
Ovalopts: con " -outline gray";
Crossopts: con " -fill red";
init()
{
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
tk = load Tk Tk->PATH;
}
blankexpander: Expander;
Expander.new(win: ref Tk->Toplevel, cvs: string): ref Expander
{
e := ref blankexpander;
e.win = win;
e.cvs = cvs;
return e;
}
moveto(win: ref Tk->Toplevel, cvs: string, tag: string, bbox: Rect, p: Point)
{
if (!bbox.min.eq(p))
cmd(win, cvs + " move " + tag + " " + p2s(p.sub(bbox.min)));
}
bbox(win: ref Tk->Toplevel, cvs, w: string): Rect
{
return s2r(cmd(win, cvs + " bbox " + w));
}
rename(win: ref Tk->Toplevel, it: Item, newname: string): Item
{
(nil, itl) := sys->tokenize(cmd(win, ".c find withtag " + it.name), " ");
cmd(win, ".c dtag " + it.name + " " + it.name);
for (; itl != nil; itl = tl itl)
cmd(win, ".c addtag " + newname + " withtag " + hd itl);
it.name = newname;
return it;
}
Expander.make(e: self ref Expander, titleitem: Item): Item
{
name := titleitem.name;
tag := " -tags " + name;
e.titleitem = rename(e.win, titleitem, "!!." + name);
cmd(e.win, e.cvs + " addtag " + name + " withtag !!." + name);
sc := spotcentre((0, 0), dxy(e.titleitem.r));
spotr := Rect(sc, sc).inset(-Spotdiam/2);
p := (spotr.max.x + Titletaglen, 0);
moveto(e.win, e.cvs, e.titleitem.name, e.titleitem.r, p);
e.titleitem.r = rmoveto(e.titleitem.r, p);
it := Item(name, ((0, 0), (spotr.max.x + Titletaglen + titleitem.r.dx(), titleitem.r.dy())), (0, 0));
# make line to the right of spot
cmd(e.win, e.cvs + " create line " +
p2s((spotr.max.x, sc.y)) + " " + p2s((spotr.max.x+Titletaglen, sc.y)) + tag + Lineopts);
# make spot
spotid := cmd(e.win, e.cvs + " create oval " +
r2s(spotr) + Ovalopts + tag);
if (e.expanded)
cmd(e.win, e.cvs + " bind " + spotid + " <ButtonRelease-1>"
+ " {send event " + name + " contract}");
else
cmd(e.win, e.cvs + " bind " + spotid + " <ButtonRelease-1>"
+ " {send event " + name + " expand}");
cmd(e.win, e.cvs + " raise " + spotid);
e.spotid = int spotid;
it.attach = (0, sc.y);
it.r.max = (e.titleitem.r.dx() + spotr.max.x + Titletaglen, e.titleitem.r.dy());
if (!e.expanded) {
addcross(e, it, name);
return it;
}
it.r = placechildren(e, it, name);
return it;
}
rmoveto(r: Rect, p: Point): Rect
{
return r.addpt(p.sub(r.min));
}
# place all children of e appropriately.
# assumes that the canvas items of all children are already made.
# return bbox rectangle of whole thing.
placechildren(e: ref Expander, it: Item, tags: string): Rect
{
ltag := " -tags {"+ tags + " !." + it.name + "}";
titlesize := dxy(e.titleitem.r);
sc := spotcentre(it.r.min, titlesize);
maxwidth := 0;
y := it.r.min.y + titlesize.y;
lasty := 0;
for (i := 0; i < len e.children; i++) {
c := e.children[i];
if (c.r.dx() > maxwidth)
maxwidth = c.r.dx();
c.r = c.r.addpt(it.r.min);
r: Rect;
r.min = (sc.x + Taglen, y);
r.max = r.min.add(dxy(c.r));
moveto(e.win, e.cvs, c.name, c.r, r.min);
# make item coords relative to parent
e.children[i].r = r.subpt(it.r.min);
cmd(e.win, e.cvs + " addtag " + it.name + " withtag " + c.name);
# horizontal attachment
cmd(e.win, e.cvs + " create line " +
p2s((sc.x, y + c.attach.y)) + " " +
p2s((sc.x + Taglen + c.attach.x, y + c.attach.y)) +
ltag + Lineopts);
lasty = y + c.attach.y;
y += r.dy();
}
# vertical attachment (if there were any children)
if (i > 0) {
id := cmd(e.win, e.cvs + " create line " +
p2s((sc.x, sc.y + Spotdiam/2)) + " " + p2s((sc.x, lasty)) + ltag + Lineopts);
cmd(e.win, e.cvs + " bind " + id + " <Button-1>"+
" {send event " + it.name + " see}");
}
r := Rect(it.r.min,
(max(sc.x+Spotdiam/2+Titletaglen+titlesize.x, sc.x+Taglen+maxwidth),
y));
return r;
}
Expander.event(e: self ref Expander, it: Item, ev: string): Item
{
case ev {
"expand" =>
if (e.expanded) {
sys->print("item %s is already expanded\n", it.name);
return it;
}
e.expanded = 1;
tags := gettags(e.win, e.cvs, string e.spotid);
cmd(e.win, e.cvs + " delete !." + it.name);
cmd(e.win, e.cvs + " bind " + string e.spotid + " <ButtonRelease-1>" +
+ " {send event " + it.name + " contract}");
it.r = placechildren(e, it, tags);
"contract" =>
if (!e.expanded) {
sys->print("item %s is already contracted\n", it.name);
return it;
}
e.expanded = 0;
cmd(e.win, e.cvs + " delete !." + it.name);
for (i := 0; i < len e.children; i++)
cmd(e.win, e.cvs + " delete " + e.children[i].name);
cmd(e.win, e.cvs + " bind " + string e.spotid + " <ButtonRelease-1>" +
+ " {send event " + it.name + " expand}");
tags := gettags(e.win, e.cvs, string e.spotid);
addcross(e, it, tags);
titlesize := dxy(e.titleitem.r);
it.r.max = it.r.min.add((Taglen * 2 + Spotdiam + titlesize.x, titlesize.y));
e.children = nil;
"see" =>
cmd(e.win, e.cvs + " see " + p2s(it.r.min));
* =>
sys->print("unknown event '%s' on item %s\n", ev, it.name);
}
return it;
}
Expander.childrenchanged(e: self ref Expander, it: Item): Item
{
cmd(e.win, e.cvs + " delete !." + it.name);
tags := gettags(e.win, e.cvs, string e.spotid);
it.r = placechildren(e, it, tags);
return it;
}
gettags(win: ref Tk->Toplevel, cvs: string, name: string): string
{
tags := cmd(win, cvs + " gettags " + name);
(n, tagl) := sys->tokenize(tags, " ");
ntags := "";
for (; tagl != nil; tagl = tl tagl) {
t := hd tagl;
if (t[0] != '!' && (t[0] < '0' || t[0] > '9'))
ntags += " " + t;
}
return ntags;
}
spotcentre(origin, titlesize: Point): Point
{
return (origin.x + Spotdiam / 2, origin.y + titlesize.y / 2);
}
addcross(e: ref Expander, it: Item, tags: string)
{
p := spotcentre(it.r.min, dxy(e.titleitem.r));
crosstags := " -tags {" + tags + " !." + it.name + "}";
id1 := cmd(e.win, e.cvs + " create line " +
p2s((p.x-Spotdiam/2, p.y)) + " " +
p2s((p.x+Spotdiam/2, p.y)) + crosstags + Crossopts);
id2 := cmd(e.win, e.cvs + " create line " +
p2s((p.x, p.y-Spotdiam/2)) + " " +
p2s((p.x, p.y+Spotdiam/2)) + crosstags + Crossopts);
cmd(e.win, e.cvs + " lower " + id1 + ";" + e.cvs + " lower " + id2);
}
knownfont: string;
knownfontheight: int;
fontheight(win: ref Tk->Toplevel, font: string): int
{
Font: import draw;
if (font == knownfont)
return knownfontheight;
if (win.image == nil) # can happen if we run out of image memory
return -1;
f := Font.open(win.image.display, font);
if (f == nil)
return -1;
knownfont = font;
knownfontheight = f.height;
return f.height;
}
maketext(win: ref Tk->Toplevel, cvs: string, name: string, text: string): Item
{
tag := " -tags " + name;
it := Item(name, ((0, 0), (0, 0)), (0, 0));
ttid := cmd(win, cvs + " create text 0 0 " +
" -anchor nw" + tag +
" -text '" + text);
it.r = bbox(win, cvs, ttid);
h := fontheight(win, cmd(win, cvs + " itemcget " + ttid + " -font"));
if (h != -1) {
dh := it.r.dy() - h;
it.r.min.y += dh / 2;
it.r.max.y -= dh / 2;
}
it.attach = (0, it.r.dy() / 2);
return it;
}
cmd(top: ref Tk->Toplevel, s: string): string
{
e := tk->cmd(top, s);
if (e != nil && e[0] == '!')
sys->fprint(sys->fildes(2), "items: tk error %s on '%s'\n", e, s);
return e;
}
r2s(r: Rect): string
{
return string r.min.x + " " + string r.min.y + " " +
string r.max.x + " " + string r.max.y;
}
s2r(s: string): Rect
{
(n, toks) := sys->tokenize(s, " ");
if (n != 4) {
sys->print("'%s' is not a rectangle!\n", s);
raise "bad conversion";
}
r: Rect;
(r.min.x, toks) = (int hd toks, tl toks);
(r.min.y, toks) = (int hd toks, tl toks);
(r.max.x, toks) = (int hd toks, tl toks);
(r.max.y, toks) = (int hd toks, tl toks);
return r;
}
Item.eq(i: self Item, j: Item): int
{
return i.r.eq(j.r) && i.attach.eq(j.attach) && i.name == j.name;
}
Item.addpt(i: self Item, p: Point): Item
{
i.r = i.r.addpt(p);
return i;
}
Item.subpt(i: self Item, p: Point): Item
{
i.r = i.r.subpt(p);
return i;
}
p2s(p: Point): string
{
return string p.x + " " + string p.y;
}
dxy(r: Rect): Point
{
return r.max.sub(r.min);
}
max(a, b: int): int
{
if (a > b)
return a;
return b;
}