1tk_focusNext(n)              Tk Built-In Commands              tk_focusNext(n)
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NAME

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

12       tk_focusNext window
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14       tk_focusPrev window
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16       tk_focusFollowsMouse
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DESCRIPTION

20       tk_focusNext is a utility procedure used for  keyboard  traversal.   It
21       returns  the “next” window after window in focus order. The focus order
22       is determined by the stacking order of windows and the structure of the
23       window  hierarchy.   Among siblings, the focus order is the same as the
24       stacking order, with the lowest window being first.  If  a  window  has
25       children, the window is visited first, followed by its children (recur‐
26       sively), followed by its next sibling.  Top-level  windows  other  than
27       window  are  skipped,  so that tk_focusNext never returns a window in a
28       different top-level from window.
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30       After computing the next window,  tk_focusNext  examines  the  window's
31       -takefocus  option  to see whether it should be skipped.  If so, tk_fo‐
32       cusNext continues on to the next window in the focus  order,  until  it
33       eventually finds a window that will accept the focus or returns back to
34       window.
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36       tk_focusPrev is similar to tk_focusNext except that it returns the win‐
37       dow just before window in the focus order.
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39       tk_focusFollowsMouse  changes the focus model for the application to an
40       implicit one where the window under the mouse gets  the  focus.   After
41       this  procedure  is  called, whenever the mouse enters a window Tk will
42       automatically give it the input focus.  The focus command may  be  used
43       to  move  the focus to a window other than the one under the mouse, but
44       as soon as the mouse moves into a new window the  focus  will  jump  to
45       that window.  Note: at present there is no built-in support for return‐
46       ing the application to an explicit focus model;  to do  this  you  will
47       have  to  write a script that deletes the bindings created by tk_focus‐
48       FollowsMouse.
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KEYWORDS

51       focus, keyboard traversal, top-level
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55Tk                                    4.0                      tk_focusNext(n)