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(event-closest-point): New function.

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(event-closest-point-1): New subroutine.

(mouse-event-p, button-event-p): New functions.
This commit is contained in:
Richard M. Stallman 1997-05-17 18:38:17 +00:00
parent 0303e8da31
commit 4f76fb9ac4
1 changed files with 55 additions and 0 deletions
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55
lisp/emacs-lisp/levents.el
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@ -73,6 +73,21 @@ In this emulation, it returns nil."
(or (memq 'click (get (car obj) 'event-symbol-elements))
(memq 'drag (get (car obj) 'event-symbol-elements)))))
(defun button-event-p (obj)
"True if the argument is a mouse-button press or release event object."
(and (consp obj) (symbolp (car obj))
(or (memq 'click (get (car obj) 'event-symbol-elements))
(memq 'down (get (car obj) 'event-symbol-elements))
(memq 'drag (get (car obj) 'event-symbol-elements)))))
(defun mouse-event-p (obj)
"True if the argument is a mouse-button press or release event object."
(and (consp obj) (symbolp (car obj))
(or (eq (car obj) 'mouse-movement)
(memq 'click (get (car obj) 'event-symbol-elements))
(memq 'down (get (car obj) 'event-symbol-elements))
(memq 'drag (get (car obj) 'event-symbol-elements)))))
(defun character-to-event (ch &optional event)
"Converts a numeric ASCII value to an event structure, replete with
bucky bits. The character is the first argument, and the event to fill
@ -142,6 +157,46 @@ not occur over text, then this returns nil. Otherwise, it returns an index
into the buffer visible in the event's window."
(posn-point (event-end event)))
;; Return position of start of line LINE in WINDOW.
;; If LINE is nil, return the last position
;; visible in WINDOW.
(defun event-closest-point-1 (window &optional line)
(let* ((total (- (window-height window)
(if (window-minibuffer-p window)
0 1)))
(distance (or line total)))
(save-excursion
(goto-char (window-start window))
(if (= (vertical-motion distance) distance)
(if (not line)
(forward-char -1)))
(point))))
(defun event-closest-point (event &optional start-window)
"Return the nearest position to where EVENT ended its motion.
This is computed for the window where EVENT's motion started,
or for window WINDOW if that is specified."
(or start-window (setq start-window (posn-window (event-start event))))
(if (eq start-window (posn-window (event-end event)))
(if (eq (event-point event) 'vertical-line)
(event-closest-point-1 start-window
(cdr (posn-col-row (event-end event))))
(if (eq (event-point event) 'mode-line)
(event-closest-point-1 start-window)
(event-point event)))
;; EVENT ended in some other window.
(let* ((end-w (posn-window (event-end event)))
(end-w-top)
(w-top (nth 1 (window-edges start-window))))
(setq end-w-top
(if (windowp end-w)
(nth 1 (window-edges end-w))
(/ (cdr (posn-x-y (event-end event)))
((frame-char-height end-w)))))
(if (>= end-w-top w-top)
(event-closest-point-1 start-window)
(window-start start-window)))))
(defun event-process (event)
"Returns the process of the given process-output event."
(nth 1 event))