ref: 2459e34d77e2e21ef829c0dfaafd99433899494f
dir: /man/2/wmclient/
.TH WMCLIENT 2
.SH NAME
wmclient: makedrawcontext, window, snarfput, snarfget \-
window manager interface for Draw-based applications.
.SH SYNOPSIS
.EX
include "tk.m";
include "wmclient.m";
wmclient := load Wmclient Wmclient->PATH;
Resize,
Hide,
Help,
OK,
Plain: con 1 << iota;
Appl: con Resize | Hide;
init: fn();
makedrawcontext: fn(): ref Draw->Context;
window: fn(ctxt: ref Draw->Context, title: string, buts: int): ref Window;
snarfput: fn(buf: string);
snarfget: fn(): string;
Window: adt{
display: ref Draw->Display;
r: Draw->Rect; # full rectangle of window, including titlebar.
image: ref Draw->Image;
screenr: Draw->Rect;
ctxt: ref Draw->Wmcontext;
focused: int;
ctl: chan of string;
startinput: fn(w: self ref Window, devs: list of string);
wmctl: fn(w: self ref Window, request: string): string;
settitle: fn(w: self ref Window, name: string): string;
reshape: fn(w: self ref Window, r: Draw->Rect);
onscreen: fn(w: self ref Window, how: string);
screenr2imager: fn(w: self ref Window, sr: Draw->Rect): Draw->Rect;
imager2screenr: fn(w: self ref Window, ir: Draw->Rect): Draw->Rect;
pointer: fn(w: self ref Window, p: Draw->Pointer): int;
};
.EE
.SH DESCRIPTION
The
.B Wmclient
module provides routines for making windows controlled by
.IR wm (1)
containing an image that can be drawn on with the
routines described in
.IR draw-image (2).
.PP
.B Init
should be called once to initialise the internal state of
.BR wmclient .
.PP
.B Makedrawcontext
establishes an initial connection with the window manager,
creating a new
.B Draw
context suitable for creating new windows. It is only
necessary to call this if the application has not already
been provided with a context.
.PP
.B Window
creates a new window through
.IR ctxt
and returns it.
.I Title
gives a label that will be displayed in the title bar
of the window;
.I buts
determines which buttons are created in the titlebar,
a bitwise combination of the constants
.BR Resize ,
.BR Help ,
.BR OK,
and
.BR Hide .
If
.B Plain
is given, the window is given no decoration at all.
.PP
When a window, say
.IR w ,
is first created, its size has not been determined
and its image is not yet allocated.
.IB W .reshape
sets the requested rectangle for the window,
(and requests a new image for the window
if it has already been made visible),
where
.I r
gives the requested rectangle of the new
image, excluding window decoration, such as the
title bar and the window border.
An application can use
.IB w .screenr2imager
to find out the usable rectangle within screen
rectangle
.I sr
when window decorations are taken into account.
.IB W .imager2screenr
converts in the other direction.
.IB W .screenr
contains the current rectangle of the screen containing
the window.
.PP
.IB W .image
holds the window's image when it has been successfully created;
.IB w .ctxt
holds the window manager context for the window, from which
keyboard and mouse events can be received.
No such events will be received until
.IB w .startinput
is called, with a list of devices (e.g.
.BR ptr ,
.BR kbd )
to start input for.
.IB W .settitle
sets the title that is shown on the window's title bar;
it can make the window's size (and therefore the window's image)
change.
.PP
.IB W .ctl
is a channel down which requests from the titlebar are sent.
Messages received on it should be processed by
the application or passed to
.IB w \.wmctl\fR.
Requests are formatted
as with
.B quoted
in
.IR string (2).
The messages include:
.TP
.B exit
The window should be closed.
.IB W .wmctl
will kill all processes in the current
process group.
.TP
.B !move \fIx\fP \fIy\fP
The user has started to try to drag the window.
.I X
and
.I y
give the location of the initial pointer click.
.TP
.B !size \fImindx\fP \fImindy\fP
The user wishes to resize the window.
.I Mindx
and
.I mindy
give the minimum size acceptable for the window.
.TP
.B help
The help button has been clicked.
.TP
.B ok
The OK button has been clicked.
.TP
.B hide
The Hide button has been clicked.
.IB W .wmctl
will delete the window, and an entry
will be shown on the toolbar.
.PP
In order to function correctly, an application
should process not only events from the
title bar channel, but also events received from the window
manager itself (via
.IB w .ctxt.ctl\fR),\fP
and pointer and keyboard events received from
the window manager (via
.IB top .ctxt.ptr
and
.IB top .ctxt.kbd
respectively).
Control events can be passed to
.IB w .wmctl \fR;
keyboard events can be processed by the application;
pointer events should be passed to
.IB w .pointer
for processing; if this returns zero, the
application should process the pointer event,
otherwise the event has been consumed by the
titlebar.
.PP
When created, the window is not visible;
.IB w .onscreen
makes it visible, and possibly chooses a
position and a size for it.
.I How
specifies what sort of placement is required
for the window; it can be one of
.TP
.B place
tries to choose a suitable place on the screen
with respect to other windows; it may size the
window as it feels appropriate. This the default
(if
.I how
is nil).
.TP
.B onscreen
tries to keep the position and size the same
as specified on the window, adjusting them only
to bring the window fully on screen, and making sure
that the window is no bigger than the entire display.
.TP
.B exact
does not change the specified size or position
of the window unless absolutely necessary.
.PP
.B Snarfget
and
.B snarfput
retrieve and replace the contents of the window
manager's snarf buffer.
.SH FILES
.TF /chan/snarf
.TP
.B /chan/snarf
snarf buffer maintained by
.IR wm (1)
.TP
.B /chan/wm
channel for interaction with
.IR wm (1)
.SH SOURCE
.B /appl/lib/wmclient.b
.SH SEE ALSO
.IR wm (1),
.IR tk (2)