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A dialog box is a variant of a pop-up menu--it looks a little
different, it always appears in the center of a frame, and it has just
one level and one pane. The main use of dialog boxes is for asking
questions that the user can answer with "yes", "no", and a few other
alternatives. The functions
dialog boxes instead of the keyboard, when called from commands invoked
by mouse clicks.
(title (string . value)...)
which looks like the list that specifies a single pane for
The return value is value from the chosen alternative.
An element of the list may be just a string instead of a cons cell
(string . value). That makes a box that cannot
nil appears in the list, it separates the left-hand items from
the right-hand items; items that precede the
nil appear on the
left, and items that follow the
nil appear on the right. If you
don't include a
nil in the list, then approximately half the
items appear on each side.
Dialog boxes always appear in the center of a frame; the argument
position specifies which frame. The possible values are as in
x-popup-menu, but the precise coordinates don't matter; only the
In some configurations, Emacs cannot display a real dialog box; so instead it displays the same items in a pop-up menu in the center of the frame.
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