tk_focusNext(3tk) Tk Built-In Commands tk_focusNext(3tk)
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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 (recur-
sively), 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_fo-
cusNext 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 win-
dow 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 return-
ing the application to an explicit focus model; to do this you will
have to write a script that deletes the bindings created by tk_focus-
FollowsMouse.
KEYWORDS
focus, keyboard traversal, top-level
Tk 4.0 tk_focusNext(3tk)
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