Customized.

[gnu-emacs] / lisp / emacs-lisp / levents.el

diff --git a/lisp/emacs-lisp/levents.el b/lisp/emacs-lisp/levents.el
index 56dfcaf0e164f686a937cee110f6ccb9cbb05bd8..0cb860c6d444bc994037e2b0215d4f0465e704db 100644 (file)
--- a/lisp/emacs-lisp/levents.el
+++ b/lisp/emacs-lisp/levents.el
@@ -15,8 +15,9 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING.  If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
 
 ;;; Commentary:
 
@@ -72,6 +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
@@ -141,6 +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))
@@ -229,9 +285,6 @@ an existing event object."
 GNU Emacs 19 does not currently generate process-output events."
   (eq (car-safe obj) 'process))
 
-(defun timeout-event-p (obj)
-  "True if the argument is a timeout event object.
-GNU Emacs 19 does not currently generate timeout events."
-  (eq (car-safe obj) 'timeout))
+(provide 'levents)
 
 ;;; levents.el ends here