ref: 54bac038f411c10a596adf84c06df32f8c7c4c53
dir: /appl/lib/dividers.b/
implement Dividers;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Point, Rect: import draw;
include "tk.m";
tk: Tk;
include "dividers.m";
Lay: adt {
d: int;
x: fn(l: self Lay, p: Point): int;
y: fn(l: self Lay, p: Point): int;
mkr: fn(l: self Lay, r: Rect): Rect;
mkpt: fn(l: self Lay, p: Point): Point;
};
DIVHEIGHT: con 6;
init()
{
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
tk = load Tk Tk->PATH;
}
# dir is direction in which to stack widgets (NS or EW)
Divider.new(win: ref Tk->Toplevel, w: string, wl: list of string, dir: int): (ref Divider, chan of string)
{
lay := Lay(dir);
n := len wl;
d := ref Divider(win, w, nil, dir, array[n] of {* => ref DWidget}, (0, 0));
p := Point(0, 0);
for (i := 0; wl != nil; (wl, i) = (tl wl, i+1)) {
sz := lay.mkpt(wsize(win, hd wl));
*d.widgets[i] = (hd wl, (p, p.add(sz)), sz);
if (sz.x > d.canvsize.x)
d.canvsize.x = sz.x;
p.y += sz.y + DIVHEIGHT;
}
d.canvsize.y = p.y - DIVHEIGHT;
cmd(win, "canvas " + d.w + " -width " + string lay.x(d.canvsize) +
" -height " + string lay.y(d.canvsize));
ech := chan of string;
echname := "dw" + d.w;
tk->namechan(win, ech, echname);
for (i = 0; i < n; i++) {
dw := d.widgets[i];
dw.r.max.x = d.canvsize.x + dw.r.min.x;
sz := dxy(dw.r);
cmd(win, d.w + " create window " + p2s(lay.mkpt(dw.r.min)) +
" -window " + dw.w +
" -tags w" + string i + " -anchor nw" +
" -width " + string lay.x(sz) +
" -height " + string lay.y(sz));
cmd(win, "pack propagate " + dw.w + " 0");
if (i < n - 1) {
r := lay.mkr(((dw.r.min.x, dw.r.max.y),
(dw.r.max.x, dw.r.max.y + DIVHEIGHT)));
cmd(win, d.w + " create rectangle " + r2s(r) +
" -fill red" +
" -tags d" + string i);
cmd(win, d.w + " bind d" + string i + " <Button-1>" +
" {send " + echname + " but " + string i + " %x %y}");
cmd(win, d.w + " bind d" + string i + " <Motion-Button-1> {}");
cmd(win, d.w + " bind d" + string i + " <ButtonRelease-1>" +
" {send " + echname + " up x %x %y}");
}
}
cmd(win, d.w + " create rectangle -2 -2 -1 -1 -tags grab");
cmd(win, d.w + " bind grab <Button-1> {send " + echname + " drag x %x %y}");
cmd(win, d.w + " bind grab <ButtonRelease-1> {send " + echname + " up x %x %y}");
cmd(win, "bind " + d.w + " <Configure> {send " + echname + " config x x x}");
return (d, ech);
}
Divider.event(d: self ref Divider, e: string)
{
(n, toks) := sys->tokenize(e, " ");
if (n != 4) {
sys->print("dividers: invalid event %s\n", e);
return;
}
lay := Lay(d.dir);
p := lay.mkpt((int hd tl tl toks, int hd tl tl tl toks));
t := hd toks;
if (t == "but" && d.state != nil)
t = "drag";
case t {
"but" =>
if (d.state != nil) {
sys->print("dividers: event '%s' received in drag mode\n", e);
return;
}
div := int hd tl toks;
d.state = ref DState;
d.state.dragdiv = div;
d.state.dy = p.y - d.widgets[div].r.max.y;
d.state.maxy = d.widgets[div+1].r.max.y - DIVHEIGHT;
d.state.miny = d.widgets[div].r.min.y;
cmd(d.win, d.w + " itemconfigure d" + string div + " -fill orange");
cmd(d.win, d.w + " raise d" + string div);
cmd(d.win, d.w + " coords grab -10000 -10000 10000 10000");
cmd(d.win, "grab set " + d.w);
cmd(d.win, "update");
"drag" =>
if (d.state == nil) {
sys->print("dividers: event '%s' received in non-drag mode\n", e);
return;
}
div := d.state.dragdiv;
ypos := p.y - d.state.dy;
if (ypos > d.state.maxy)
ypos = d.state.maxy;
else if (ypos < d.state.miny)
ypos = d.state.miny;
r := Rect((0, ypos), (d.canvsize.x, ypos + DIVHEIGHT));
cmd(d.win, d.w + " coords d" + string div + " " + r2s(lay.mkr(r)));
d.widgets[div].r.max.y = ypos;
d.widgets[div+1].r.min.y = ypos + DIVHEIGHT;
relayout(d);
cmd(d.win, "update");
"up" =>
if (d.state == nil) {
sys->print("dividers: event '%s' received in non-drag mode\n", e);
return;
}
div := d.state.dragdiv;
cmd(d.win, d.w + " itemconfigure d" + string div + " -fill red");
cmd(d.win, d.w + " coords grab -2 -2 -1 -1");
cmd(d.win, "grab release " + d.w);
cmd(d.win, "update");
d.state = nil;
"config" =>
resize(d);
cmd(d.win, "update");
}
}
# lay out widgets according to rectangles that have been already specified.
relayout(d: ref Divider)
{
lay := Lay(d.dir);
for (i := 0; i < len d.widgets; i++) {
dw := d.widgets[i];
sz := dxy(dw.r);
szs := " -width " + string lay.x(sz) + " -height " + string lay.y(sz);
cmd(d.win, d.w + " coords w" + string i + " " + p2s(lay.mkpt(dw.r.min)));
cmd(d.win, d.w + " itemconfigure w" + string i + szs);
cmd(d.win, dw.w + " configure" + szs);
if (i < len d.widgets - 1) {
r := lay.mkr(((dw.r.min.x, dw.r.max.y),
(dw.r.max.x, dw.r.max.y + DIVHEIGHT)));
cmd(d.win, d.w + " coords d" + string i + " " + r2s(r));
}
}
}
# resize based on current actual size of canvas;
# sections resize proportionate to their previously occupied space.
# strange things will happen if we're resizing in the middle of a drag...
resize(d: ref Divider)
{
lay := Lay(d.dir);
sz := lay.mkpt((int cmd(d.win, d.w + " cget -actwidth"),
int cmd(d.win, d.w + " cget -actheight")));
wspace := (len d.widgets - 1) * DIVHEIGHT;
y := 0;
for (i := 0; i < len d.widgets; i++) {
dw := d.widgets[i];
prop := real dw.r.dy() / real (d.canvsize.y - wspace);
dw.r = ((0, y), (sz.x, y + int (prop * real (sz.y - wspace))));
y = dw.r.max.y + DIVHEIGHT;
}
y -= DIVHEIGHT;
# compensate for rounding errors
d.widgets[i - 1].r.max.y -= y - sz.y;
d.canvsize = sz;
relayout(d);
}
wsize(win: ref Tk->Toplevel, w: string): Point
{
bw := int cmd(win, w + " cget -borderwidth");
return Point(int cmd(win, w + " cget -width") + bw*2,
int cmd(win, w + " cget -height") + bw*2);
}
dxy(r: Rect): Point
{
return r.max.sub(r.min);
}
p2s(p: Point): string
{
return string p.x + " " + string p.y;
}
r2s(r: Rect): string
{
return string r.min.x + " " + string r.min.y + " " +
string r.max.x + " " + string r.max.y;
}
Lay.x(l: self Lay, p: Point): int
{
if (l.d == NS)
return p.x;
return p.y;
}
Lay.y(l: self Lay, p: Point): int
{
if (l.d == NS)
return p.y;
return p.x;
}
Lay.mkr(l: self Lay, r: Rect): Rect
{
if (l.d == NS)
return r;
return ((r.min.y, r.min.x), (r.max.y, r.max.x));
}
Lay.mkpt(l: self Lay, p: Point): Point
{
if (l.d == NS)
return p;
return (p.y, p.x);
}
cmd(top: ref Tk->Toplevel, s: string): string
{
e := tk->cmd(top, s);
if (e != nil && e[0] == '!')
sys->print("dividers: tk error %s on '%s'\n", e, s);
return e;
}