ref: 9f76a7f6819ac04552b4fb6588156f3e4089d1d7
dir: /man/2/dividers/
.TH DIVIDERS 2
.SH NAME
Dividers \- user-draggable tk dividing bars
.SH SYNOPSIS
.EX
include "dividers.m";
dividers := load Dividers Dividers->PATH;
Divider: import dividers;
init: fn();
Divider: adt {
new: fn(win: ref Tk->Toplevel, w: string, wl: list of string, dir: int):
(ref Divider, chan of string);
event: fn(d: self ref Divider, e: string);
};
.EE
.SH DESCRIPTION
.I Dividers
presents an interface allowing Tk widgets to
be arranged within a window, divided by bars which
can be dragged by the user to determine the proportion
of the available space to allocate to each widget.
The groups can be stacked vertically or horizontally.
.I Divider
widgets can be nested.
.PP
.B Init
must be called before anything else, to allow
.I Dividers
to initialise its internal state.
.B Divider.new
creates a new divider widget; it will be named
.IR w ,
and it will divide up the widgets named in
the list
.IR wl .
.I Dir
can be
.BR Dividers->NS ,
to stack the widgets one on top of another,
or
.BR Dividers->EW
to stack the widgets left-right.
.B Divider.new
returns a new
.B Divider
adt, and a channel through which
.B Divider
events will be received.
The application should arrange that events
received on this channel be passed to the
.B event()
function.
.PP
A
.B Divider
widget must be informed if its size has changed
by configuring its width and height appropriately;
it does the same to the items it is dividing.
.SH SOURCE
.B /appl/lib/dividers.b
.SH BUGS
It should not be necessary to inform the
.B Divider
widget of size changes.
.PP
The event-based mechanism seems somewhat
contrary to the preferred Limbo way of doing things.