Function: idlwave-region-active-p

idlwave-region-active-p is a function alias for use-region-p, defined in simple.el.gz.

This function is obsolete since 28.1; use use-region-p instead.

Signature

(idlwave-region-active-p)

Documentation

Return t if the region is active and it is appropriate to act on it.

This is used by commands that act specially on the region under Transient Mark mode.

The return value is t if Transient Mark mode is enabled and the mark is active; furthermore, if use-empty-active-region is nil, the region must not be empty. Otherwise, the return value is nil.

If use-empty-active-region is non-nil, there is one further caveat: If the user has used \mouse-1 to set point, but used the mouse to move point to a different character yet, this function returns nil.

For some commands, it may be appropriate to ignore the value of use-empty-active-region; in that case, use region-active-p.

You can use the interactive code letter R when writing commands that act specially on an active region. For interactive specs that evaluate Lisp forms to produce a list of arguments, see the functions use-region-beginning and use-region-end.

Aliases

reftex-region-active-p (obsolete since 28.1) idlwave-region-active-p (obsolete since 28.1)