tk_focusNext(n) Tk (4.0) tk_focusNext(n)
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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'll have to write a
script that deletes the bindings created by
tk_focusFollowsMouse.
KEYWORDS
Page 1 (printed 2/26/99)
tk_focusNext(n) Tk (4.0) tk_focusNext(n)
focus, keyboard traversal, top-level
Page 2 (printed 2/26/99)
