NAME

       tk_focusNext,  tk_focusPrev,  tk_focusFollowsMouse  -  Utility procedures for managing the
       input focus.

SYNOPSIS

       tk_focusNext window

       tk_focusPrev window

       tk_focusFollowsMouse
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DESCRIPTION

       tk_focusNext is a utility procedure used for keyboard traversal.  It  returns  the  “next”
       window after window in focus order. The focus order is determined by the stacking order of
       windows and the structure of the window hierarchy.  Among siblings, the focus order is the
       same as the stacking order, with the lowest window being first.  If a window has children,
       the window is visited first, followed by its children (recursively), followed by its  next
       sibling.   Top-level  windows  other  than  window are skipped, so that tk_focusNext never
       returns a window in a different top-level from window.

       After computing the next window, tk_focusNext examines the window's -takefocus  option  to
       see  whether it should be skipped.  If so, tk_focusNext continues on to the next window in
       the focus order, until it eventually finds a window that will accept the focus or  returns
       back to window.

       tk_focusPrev  is  similar  to  tk_focusNext  except that it returns the window just before
       window in the focus order.

       tk_focusFollowsMouse changes the focus model for the application to an implicit one  where
       the  window  under the mouse gets the focus.  After this procedure is called, whenever the
       mouse enters a window Tk will automatically give it the input focus.   The  focus  command
       may  be used to move the focus to a window other than the one under the mouse, but as soon
       as the mouse moves into a new window the focus will jump to that window.  Note: at present
       there is no built-in support for returning the application to an explicit focus model;  to
       do  this  you  will  have  to  write  a  script  that  deletes  the  bindings  created  by
       tk_focusFollowsMouse.

KEYWORDS

       focus, keyboard traversal, top-level