NAME¶
tk_focusNext, tk_focusPrev, tk_focusFollowsMouse - Utility procedures for
managing the input focus.
SYNOPSIS¶
tk_focusNext window
tk_focusPrev window
tk_focusFollowsMouse
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