WMCLIENT(2) WMCLIENT(2)
NAME
wmclient: makedrawcontext, window, snarfput, snarfget -
window manager interface for Draw-based applications.
SYNOPSIS
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;
};
DESCRIPTION
The Wmclient module provides routines for making windows
controlled by wm(1) containing an image that can be drawn on
with the routines described in draw-image(2).
Init should be called once to initialise the internal state
of wmclient.
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WMCLIENT(2) WMCLIENT(2)
Makedrawcontext establishes an initial connection with the
window manager, creating a new Draw context suitable for
creating new windows. It is only necessary to call this if
the application has not already been provided with a con-
text.
Window creates a new window through ctxt and returns it.
Title gives a label that will be displayed in the title bar
of the window; buts determines which buttons are created in
the titlebar, a bitwise combination of the constants Resize,
Help, OK, and Hide. If Plain is given, the window is given
no decoration at all.
When a window, say w, is first created, its size has not
been determined and its image is not yet allocated.
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 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
w.screenr2imager to find out the usable rectangle within
screen rectangle sr when window decorations are taken into
account. W.imager2screenr converts in the other direction.
W.screenr contains the current rectangle of the screen con-
taining the window.
W.image holds the window's image when it has been success-
fully created; 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
w.startinput is called, with a list of devices (e.g. ptr,
kbd) to start input for. 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.
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 w.wmctl. Requests are formatted as
with quoted in string(2). The messages include:
exit The window should be closed. W.wmctl will kill all
processes in the current process group.
!move x y
The user has started to try to drag the window. X and
y give the location of the initial pointer click.
!size mindx mindy
The user wishes to resize the window. Mindx and mindy
give the minimum size acceptable for the window.
help The help button has been clicked.
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WMCLIENT(2) WMCLIENT(2)
ok The OK button has been clicked.
hide The Hide button has been clicked. W.wmctl will delete
the window, and an entry will be shown on the toolbar.
In order to function correctly, an application should pro-
cess not only events from the title bar channel, but also
events received from the window manager itself (via
w.ctxt.ctl), and pointer and keyboard events received from
the window manager (via top.ctxt.ptr and top.ctxt.kbd
respectively). Control events can be passed to w.wmctl;
keyboard events can be processed by the application; pointer
events should be passed to w.pointer for processing; if this
returns zero, the application should process the pointer
event, otherwise the event has been consumed by the title-
bar.
When created, the window is not visible; w.onscreen makes it
visible, and possibly chooses a position and a size for it.
How specifies what sort of placement is required for the
window; it can be one of
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 how is nil).
onscreen
tries to keep the position and size the same as speci-
fied 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.
exact
does not change the specified size or position of the
window unless absolutely necessary.
Snarfget and snarfput retrieve and replace the contents of
the window manager's snarf buffer.
FILES
/chan/snarf snarf buffer maintained by wm(1)
/chan/wm channel for interaction with wm(1)
SOURCE
/appl/lib/wmclient.b
SEE ALSO
wm(1), tk(2)
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