71 lines
2.7 KiB
Plaintext
71 lines
2.7 KiB
Plaintext
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'\" Color=Green
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'\"
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'\"
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'\" Copyright (c) 1994 The Regents of the University of California.
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'\" Copyright (c) 1994-1995 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" @(#) focusNext.n 1.8 95/08/12 17:35:28
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'\"
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.so STk-man.macros
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.TH Tk:focus-next n 3.1 STk "Tk Built-In Commands"
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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Tk:focus-next, Tk:focus-prev, Tk:focus-follows-mouse, Tk:focus-on, Tk:focus-off \- Utility procedures for managing the input focus.
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.SH SYNOPSIS
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(\fBTk:focus-next \fIwindow\fR)
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.sp
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(\fBTk:focus-prev \fIwindow\fR)
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.sp
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(\fBTk:focus-follows-mouse\fR)
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.BE
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.SH DESCRIPTION
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.PP
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\fBTk:focus-next\fR is a utility procedure used for keyboard traversal.
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It returns the ``next'' window after \fIwindow\fR in focus order.
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The focus order is determined by
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the stacking order of windows and the structure of the window hierarchy.
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Among siblings, the focus order is the same as the stacking order, with the
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lowest window being first.
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If a window has children, the window is visited first, followed by
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its children (recursively), followed by its next sibling.
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Top-level windows other than \fIwindow\fR are skipped, so that
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\fBTk:focus-next\fR never returns a window in a different top-level
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from \fIwindow\fR.
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.PP
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After computing the next window, \fBTk:focus-next\fR examines the
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window's \fB:takefocus\fR option to see whether it should be skipped.
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If so, \fBTk:focus-next\fR continues on to the next window in the focus
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order, until it eventually finds a window that will accept the focus
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or returns back to \fIwindow\fR.
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.PP
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\fBTk:focus-prev\fR is similar to \fBTk:focus-next\fR except that it
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returns the window just before \fIwindow\fR in the focus order.
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.PP
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\fBTk:focus-follows-mouse\fR changes the focus model for the application
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to an implicit one where the window under the mouse gets the focus.
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After this procedure is called, whenever the mouse enters a window
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Tk will automatically give it the input focus.
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The \fBfocus\fR command may be used to move the focus to a window
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other than the one under the mouse, but as soon as the mouse moves
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into a new window the focus will jump to that window.
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Note: at present there is no built-in support for returning the
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application to an explicit focus model; to do this you'll have
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to write a script that deletes the bindings created by
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\fBTk:focus-follows-mouse\fR.
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.PP
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\fBTk:focus-on\fR and \fBTk:focus-off\fR are simpy defined as
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.CS
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(define Tk:focus-on (lambda (w) #t))
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(define Tk:focus-off (lambda (w) #f))
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.CE
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This procedures can be used by the focus traversal algorithm presented in the
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\fBoptions\fR manual page.
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.SH SEE ALSO
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focus, toplevel
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