49 lines
2.6 KiB
HTML
49 lines
2.6 KiB
HTML
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<HTML><HEAD><TITLE>Tk Built-In Commands - tk_focusNext manual page</TITLE></HEAD><BODY>
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<H3><A NAME="M2">NAME</A></H3>
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tk_focusNext, tk_focusPrev, tk_focusFollowsMouse - Utility procedures for managing the input focus.
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>tk_focusNext </B><I>window</I><BR>
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<B>tk_focusPrev </B><I>window</I><BR>
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<B>tk_focusFollowsMouse</B><BR>
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<H3><A NAME="M4">DESCRIPTION</A></H3>
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<B>tk_focusNext</B> is a utility procedure used for keyboard traversal.
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It returns the ``next'' window after <I>window</I> 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 <I>window</I> are skipped, so that
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<B>tk_focusNext</B> never returns a window in a different top-level
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from <I>window</I>.
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<P>
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After computing the next window, <B>tk_focusNext</B> examines the
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window's <B>-takefocus</B> option to see whether it should be skipped.
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If so, <B>tk_focusNext</B> 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 <I>window</I>.
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<P>
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<B>tk_focusPrev</B> is similar to <B>tk_focusNext</B> except that it
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returns the window just before <I>window</I> in the focus order.
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<P>
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<B>tk_focusFollowsMouse</B> 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 <B><A HREF="../TclCmd/focus.htm">focus</A></B> 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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<B>tk_focusFollowsMouse</B>.
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<H3><A NAME="M5">KEYWORDS</A></H3>
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<A href="../Keywords/F.htm#focus">focus</A>, <A href="../Keywords/K.htm#keyboard traversal">keyboard traversal</A>, <A href="../Keywords/T.htm#top-level">top-level</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1994 The Regents of the University of California.
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<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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