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(frame-geom-value-cons, frame-geom-spec-cons): New fns.

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Richard M. Stallman 2008-01-03 09:57:40 +00:00
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lisp/ChangeLog
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@ -1,3 +1,7 @@
2008-01-03 Drew Adams <drew.adams@oracle.com>
* frame.el (frame-geom-value-cons, frame-geom-spec-cons): New fns.
2008-01-03 Richard Stallman <rms@gnu.org>
* replace.el (occur-context-lines): New subroutine,

62
lisp/frame.el
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@ -1329,6 +1329,68 @@ The value is one of the symbols `static-gray', `gray-scale',
'static-gray))))
;;;; Frame geometry values
(defun frame-geom-value-cons (type value &optional frame)
"Return equivalent geometry value for FRAME as a cons with car `+'.
A geometry value equivalent to VALUE for FRAME is returned,
where the value is a cons with car `+', not numeric.
TYPE is the car of the original geometry spec (TYPE . VALUE).
It is `top' or `left', depending on which edge VALUE is related to.
VALUE is the cdr of a frame geometry spec: (left/top . VALUE).
If VALUE is a number, then it is converted to a cons value, perhaps
relative to the opposite frame edge from that in the original spec.
FRAME defaults to the selected frame.
Examples (measures in pixels) -
Assuming display height/width=1024, frame height/width=600:
300 inside display edge: 300 => (+ 300)
(+ 300) => (+ 300)
300 inside opposite display edge: (- 300) => (+ 124)
-300 => (+ 124)
300 beyond display edge
(= 724 inside opposite display edge): (+ -300) => (+ -300)
300 beyond display edge
(= 724 inside opposite display edge): (- -300) => (+ 724)
In the 3rd, 4th, and 6th examples, the returned value is relative to
the opposite frame edge from the edge indicated in the input spec."
(cond ((and (consp value) (eq '+ (car value))) ; e.g. (+ 300), (+ -300)
value)
((natnump value) (list '+ value)) ; e.g. 300 => (+ 300)
(t ; e.g. -300, (- 300), (- -300)
(list '+ (- (if (eq 'left type) ; => (+ 124), (+ 124), (+ 724)
(x-display-pixel-width)
(x-display-pixel-height))
(if (integerp value) (- value) (cadr value))
(if (eq 'left type)
(frame-pixel-width frame)
(frame-pixel-height frame)))))))
(defun frame-geom-spec-cons (spec &optional frame)
"Return equivalent geometry spec for FRAME as a cons with car `+'.
A geometry specification equivalent to SPEC for FRAME is returned,
where the value is a cons with car `+', not numeric.
SPEC is a frame geometry spec: (left . VALUE) or (top . VALUE).
If VALUE is a number, then it is converted to a cons value, perhaps
relative to the opposite frame edge from that in the original spec.
FRAME defaults to the selected frame.
Examples (measures in pixels) -
Assuming display height=1024, frame height=600:
top 300 below display top: (top . 300) => (top + 300)
(top + 300) => (top + 300)
bottom 300 above display bottom: (top - 300) => (top + 124)
(top . -300) => (top + 124)
top 300 above display top
(= bottom 724 above display bottom): (top + -300) => (top + -300)
bottom 300 below display bottom
(= top 724 below display top): (top - -300) => (top + 724)
In the 3rd, 4th, and 6th examples, the returned value is relative to
the opposite frame edge from the edge indicated in the input spec."
(cons (car spec) (frame-geom-value-cons (car spec) (cdr spec))))
;;;; Aliases for backward compatibility with Emacs 18.
(define-obsolete-function-alias 'screen-height 'frame-height) ;before 19.15
(define-obsolete-function-alias 'screen-width 'frame-width) ;before 19.15