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[Emacs-diffs] Changes to emacs/lisp/wid-edit.el


From: Chong Yidong
Subject: [Emacs-diffs] Changes to emacs/lisp/wid-edit.el
Date: Thu, 16 Feb 2006 15:58:33 +0000

Index: emacs/lisp/wid-edit.el
diff -u emacs/lisp/wid-edit.el:1.165 emacs/lisp/wid-edit.el:1.166
--- emacs/lisp/wid-edit.el:1.165        Wed Feb 15 02:41:02 2006
+++ emacs/lisp/wid-edit.el      Thu Feb 16 15:58:32 2006
@@ -916,67 +916,79 @@
   "Invoke the button that the mouse is pointing at."
   (interactive "e")
   (if (widget-event-point event)
-      (let* ((pos (widget-event-point event))
+      (let* ((oevent event)
+            (mouse-1 (memq (event-basic-type event) '(mouse-1 down-mouse-1)))
+            (pos (widget-event-point event))
             (start (event-start event))
             (button (get-char-property
                      pos 'button (and (windowp (posn-window start))
                                       (window-buffer (posn-window start))))))
-       (if button
-           ;; Mouse click on a widget button.  Do the following
-           ;; in a save-excursion so that the click on the button
-           ;; doesn't change point.
-           (save-selected-window
-             (select-window (posn-window (event-start event)))
-             (save-excursion
-               (goto-char (posn-point (event-start event)))
-               (let* ((overlay (widget-get button :button-overlay))
-                      (pressed-face (or (widget-get button :pressed-face)
-                                        widget-button-pressed-face))
-                      (face (overlay-get overlay 'face))
-                      (mouse-face (overlay-get overlay 'mouse-face)))
-                 (unwind-protect
-                     ;; Read events, including mouse-movement events
-                     ;; until we receive a release event.  Highlight/
-                     ;; unhighlight the button the mouse was initially
-                     ;; on when we move over it.
-                     (save-excursion
-                       (when face      ; avoid changing around image
-                         (overlay-put overlay 'face pressed-face)
-                         (overlay-put overlay 'mouse-face pressed-face))
-                       (unless (widget-apply button :mouse-down-action event)
-                         (let ((track-mouse t))
-                           (while (not (widget-button-release-event-p event))
-                             (setq event (read-event)
-                                   pos (widget-event-point event))
-                             (if (and pos
-                                      (eq (get-char-property pos 'button)
-                                          button))
-                                 (when face
-                                   (overlay-put overlay 'face pressed-face)
-                                   (overlay-put overlay 'mouse-face 
pressed-face))
-                               (overlay-put overlay 'face face)
-                               (overlay-put overlay 'mouse-face mouse-face)))))
-
-                       ;; When mouse is released over the button, run
-                       ;; its action function.
-                       (when (and pos
-                                  (eq (get-char-property pos 'button) button))
-                         (widget-apply-action button event)))
-                   (overlay-put overlay 'face face)
-                   (overlay-put overlay 'mouse-face mouse-face))))
-
-             (unless (pos-visible-in-window-p (widget-event-point event))
-               (mouse-set-point event)
-               (beginning-of-line)
-               (recenter))
-             )
-
+       (when (or (null button)
+                 (catch 'button-press-cancelled
+             ;; Mouse click on a widget button.  Do the following
+             ;; in a save-excursion so that the click on the button
+             ;; doesn't change point.
+             (save-selected-window
+               (select-window (posn-window (event-start event)))
+               (save-excursion
+                 (goto-char (posn-point (event-start event)))
+                 (let* ((overlay (widget-get button :button-overlay))
+                        (pressed-face (or (widget-get button :pressed-face)
+                                          widget-button-pressed-face))
+                        (face (overlay-get overlay 'face))
+                        (mouse-face (overlay-get overlay 'mouse-face)))
+                   (unwind-protect
+                       ;; Read events, including mouse-movement
+                       ;; events, waiting for a release event.  If we
+                       ;; began with a mouse-1 event and receive a
+                       ;; movement event, that means the user wants
+                       ;; to perform drag-selection, so cancel the
+                       ;; button press and do the default mouse-1
+                       ;; action.  For mouse-2, just highlight/
+                       ;; unhighlight the button the mouse was
+                       ;; initially on when we move over it.
+                       (save-excursion
+                         (when face    ; avoid changing around image
+                           (overlay-put overlay 'face pressed-face)
+                           (overlay-put overlay 'mouse-face pressed-face))
+                         (unless (widget-apply button :mouse-down-action event)
+                           (let ((track-mouse t))
+                             (while (not (widget-button-release-event-p event))
+                               (setq event (read-event))
+                               (when (and mouse-1 (mouse-movement-p event))
+                                 (push event unread-command-events)
+                                 (setq event oevent)
+                                 (throw 'button-press-cancelled t))
+                               (setq pos (widget-event-point event))
+                               (if (and pos
+                                        (eq (get-char-property pos 'button)
+                                            button))
+                                   (when face
+                                     (overlay-put overlay 'face pressed-face)
+                                     (overlay-put overlay 'mouse-face 
pressed-face))
+                                 (overlay-put overlay 'face face)
+                                 (overlay-put overlay 'mouse-face 
mouse-face)))))
+
+                         ;; When mouse is released over the button, run
+                         ;; its action function.
+                         (when (and pos
+                                    (eq (get-char-property pos 'button) 
button))
+                           (widget-apply-action button event)))
+                     (overlay-put overlay 'face face)
+                     (overlay-put overlay 'mouse-face mouse-face))))
+
+               ;; This loses if the widget action switches windows. -- cyd
+               ;; (unless (pos-visible-in-window-p (widget-event-point event))
+               ;;   (mouse-set-point event)
+               ;;   (beginning-of-line)
+               ;;   (recenter))
+               )
+             nil))
          (let ((up t) command)
            ;; Mouse click not on a widget button.  Find the global
            ;; command to run, and check whether it is bound to an
            ;; up event.
-           (mouse-set-point event)
-           (if (memq (event-basic-type event) '(mouse-1 down-mouse-1))
+           (if mouse-1
                (cond ((setq command    ;down event
                             (lookup-key widget-global-map [down-mouse-1]))
                       (setq up nil))




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