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-'\"
-'\" Copyright (c) 1990-1994 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH focus n 4.0 Tk "Tk Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-focus \- Manage the input focus
-.SH SYNOPSIS
-.nf
-\fBfocus\fR
-\fBfocus \fIwindow\fR
-\fBfocus \fIoption\fR ?\fIarg arg ...\fR?
-.fi
-.BE
-.SH DESCRIPTION
-.PP
-The \fBfocus\fR command is used to manage the Tk input focus.
-At any given time, one window on each display is designated as
-the \fIfocus window\fR;  any key press or key release events for the
-display are sent to that window.
-It is normally up to the window manager to redirect the focus among the
-top-level windows of a display.  For example, some window managers
-automatically set the input focus to a top-level window whenever
-the mouse enters it;  others redirect the input focus only when
-the user clicks on a window.
-Usually the window manager will set the focus
-only to top-level windows, leaving it up to the application to
-redirect the focus among the children of the top-level.
-.PP
-Tk remembers one focus window for each top-level (the most recent
-descendant of that top-level to receive the focus);  when the window
-manager gives the focus
-to a top-level, Tk automatically redirects it to the remembered
-window.  Within a top-level Tk uses an \fIexplicit\fR focus model
-by default.  Moving the mouse within a top-level does not normally
-change the focus;  the focus changes only when a widget
-decides explicitly to claim the focus (e.g., because of a button
-click), or when the user types a key such as Tab that moves the
-focus.
-.PP
-The Tcl procedure \fBtk_focusFollowsMouse\fR may be invoked to
-create an \fIimplicit\fR focus model:  it reconfigures Tk so that
-the focus is set to a window whenever the mouse enters it.
-The Tcl procedures \fBtk_focusNext\fR and \fBtk_focusPrev\fR
-implement a focus order among the windows of a top-level;  they
-are used in the default bindings for Tab and Shift-Tab, among other
-things.
-.PP
-The \fBfocus\fR command can take any of the following forms:
-.TP
-\fBfocus\fR
-Returns the path name of the focus window on the display containing
-the application's main window,  or an empty string if no window in
-this application has the focus on that display.   Note:  it is
-better to specify the display explicitly using \fB\-displayof\fR
-(see below) so that the code will work in applications using multiple
-displays.
-.TP
-\fBfocus \fIwindow\fR
-If the application currently has the input focus on \fIwindow\fR's
-display, this command resets the input focus for \fIwindow\fR's display
-to \fIwindow\fR and returns an empty string.
-If the application does not currently have the input focus on
-\fIwindow\fR's display, \fIwindow\fR will be remembered as the focus
-for its top-level;  the next time the focus arrives at the top-level,
-Tk will redirect it to \fIwindow\fR.
-If \fIwindow\fR is an empty string then the command does nothing.
-.TP
-\fBfocus \-displayof\fR \fIwindow\fR
-Returns the name of the focus window on the display containing \fIwindow\fR.
-If the focus window for \fIwindow\fR's display is not in this
-application, the return value is an empty string.
-.TP
-\fBfocus \-force \fIwindow\fR
-Sets the focus of \fIwindow\fR's display to \fIwindow\fR, even if
-the application does not currently have the input focus for the display.
-This command should be used sparingly, if at all.
-In normal usage, an application should not claim the focus for
-itself;  instead, it should wait for the window manager to give it
-the focus.
-If \fIwindow\fR is an empty string then the command does nothing.
-.TP
-\fBfocus \-lastfor\fR \fIwindow\fR
-Returns the name of the most recent window to have the input focus
-among all the windows in the same top-level as \fIwindow\fR.
-If no window in that top-level has ever had the input focus, or
-if the most recent focus window has been deleted, then the name
-of the top-level is returned.  The return value is the window that
-will receive the input focus the next time the window manager gives
-the focus to the top-level.
-.SH "QUIRKS"
-.PP
-When an internal window receives the input focus, Tk does not actually
-set the X focus to that window;  as far as X is concerned, the focus
-will stay on the top-level window containing the window with the focus.
-However, Tk generates FocusIn and FocusOut events just as if the X
-focus were on the internal window.   This approach gets around a
-number of problems that would occur if the X focus were actually moved;
-the fact that the X focus is on the top-level is invisible unless
-you use C code to query the X server directly.
-.SH "EXAMPLE"
-.PP
-To make a window that only participates in the focus traversal ring
-when a variable is set, add the following bindings to the widgets
-\fIbefore\fR and \fIafter\fR it in that focus ring:
-.CS
-button .before \-text "Before"
-button .middle \-text "Middle"
-button .after  \-text "After"
-checkbutton .flag \-variable traverseToMiddle \-takefocus 0
-pack .flag \-side left
-pack .before .middle .after
-bind .before <Tab> {
-   if {!$traverseToMiddle} {
-      \fBfocus\fR .after
-      break
-   }
-}
-bind .after <Shift\-Tab> {
-   if {!$traverseToMiddle} {
-      \fBfocus\fR .before
-      break
-   }
-}
-\fBfocus\fR .before
-.CE
-.SH KEYWORDS
-events, focus, keyboard, top-level, window manager
-'\" Local Variables:
-'\" mode: nroff
-'\" End: