tk_focusNext(3Tk)tk_focusNext(3Tk)NAME
tk_focusNext, tk_focusPrev, tk_focusFollowsMouse - Utility procedures for
managing the input focus.
SYNOPSIS
tk_focusNext window
tk_focusPrev window
tk_focusFollowsMouseDESCRIPTION
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
focus, keyboard traversal, top-level
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