--- /dev/null
+;;; mouse.el --- window system-independent mouse support.
+
+;; Copyright (C) 1988, 1992-4, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Tinker Systems
+;; Copyright (C) 1995, 1996 Ben Wing.
+
+;; Maintainer: XEmacs Development Team
+;; Keywords: mouse, dumped
+
+;; This file is part of XEmacs.
+
+;; XEmacs is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; XEmacs is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with XEmacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Synched up with: Not synched with FSF. Almost completely divergent.
+
+;;; Commentary:
+
+;; This file is dumped with XEmacs (when window system support is compiled in).
+
+;;; Code:
+
+(provide 'mouse)
+
+(global-set-key 'button1 'mouse-track)
+(global-set-key '(shift button1) 'mouse-track-adjust)
+(global-set-key '(control button1) 'mouse-track-insert)
+(global-set-key '(control shift button1) 'mouse-track-delete-and-insert)
+(global-set-key '(meta button1) 'mouse-track-do-rectangle)
+
+;; drops are now handled in dragdrop.el (ograf@fga.de)
+
+;; enable drag regions (ograf@fga.de)
+;; if button2 is dragged from within a region, this becomes a drop
+;;
+;; this must be changed to the new api
+(if (featurep '(or offix cde mswindows))
+ (global-set-key 'button2 'mouse-drag-or-yank)
+ (global-set-key 'button2 'mouse-yank))
+
+(defgroup mouse nil
+ "Window system-independent mouse support."
+ :group 'editing)
+
+(defcustom mouse-track-rectangle-p nil
+ "*If true, then dragging out a region with the mouse selects rectangles
+instead of simple start/end regions."
+ :type 'boolean
+ :group 'mouse)
+
+(defcustom mouse-yank-at-point nil
+ "*If non-nil, the function `mouse-yank' will yank text at the cursor location.
+Otherwise, the cursor will be moved to the location of the pointer click before
+text is inserted."
+ :type 'boolean
+ :group 'mouse)
+
+(defcustom mouse-highlight-text 'context
+ "*Choose the default double-click highlighting behaviour.
+If set to `context', double-click will highlight words when the mouse
+ is at a word character, or a symbol if the mouse is at a symbol
+ character.
+If set to `word', double-click will always attempt to highlight a word.
+If set to `symbol', double-click will always attempt to highlight a
+ symbol (the default behaviour in previous XEmacs versions)."
+ :type '(choice (const context)
+ (const word)
+ (const symbol))
+ :group 'mouse)
+
+(defvar mouse-yank-function 'mouse-consolidated-yank
+ "Function that is called upon by `mouse-yank' to actually insert text.")
+
+(defun mouse-consolidated-yank ()
+ (interactive)
+ (case (device-type)
+ (x (x-yank-function))
+ (tty (yank))
+ (otherwise (yank))))
+
+\f
+(defun mouse-select ()
+ "Select Emacs window the mouse is on."
+ (interactive "@"))
+
+(defun mouse-delete-window ()
+ "Delete the Emacs window the mouse is on."
+ (interactive "@")
+ (delete-window))
+
+(defun mouse-keep-one-window ()
+ "Select Emacs window mouse is on, then kill all other Emacs windows."
+ (interactive "@")
+ (delete-other-windows))
+
+(defun mouse-select-and-split ()
+ "Select Emacs window mouse is on, then split it vertically in half."
+ (interactive "@")
+ (split-window-vertically nil))
+
+(defun mouse-set-point (event)
+ "Select Emacs window mouse is on, and move point to mouse position."
+ (interactive "@e")
+ (let ((window (event-window event))
+ (pos (event-point event))
+ (close-pos (event-closest-point event)))
+ (or window (error "not in a window"))
+ (select-window window)
+ (if (and pos (> pos 0))
+ ;; If the event was over a text char, it's easy.
+ (goto-char (max (min pos (point-max)) (point-min)))
+ (if (and close-pos (> close-pos 0))
+ (goto-char (max (min close-pos (point-max)) (point-min)))
+ ;; When the event occurs outside of the frame directly to the
+ ;; left or right of a modeline, close-point is nil, but
+ ;; event-over-modeline is also nil. That will drop us to this
+ ;; point. So instead of erroring, just return nil.
+ nil))))
+
+(defun mouse-yank (event)
+ "Paste text with the mouse.
+If the variable `mouse-yank-at-point' is nil, then pasting occurs at the
+location of the click; otherwise, pasting occurs at the current cursor
+location."
+ (interactive "e")
+ (and (not mouse-yank-at-point)
+ (mouse-set-point event))
+ (funcall mouse-yank-function))
+
+(defun click-inside-extent-p (click extent)
+ "Return non-nil if the button event is within the primary selection-extent.
+Return nil otherwise."
+ ;; stig@hackvan.com
+ (let ((ewin (event-window click))
+ (epnt (event-point click)))
+ (and ewin
+ epnt
+ extent
+ (eq (window-buffer ewin)
+ (extent-object extent))
+ (extent-start-position extent)
+ (> epnt (extent-start-position extent))
+ (> (extent-end-position extent) epnt))))
+
+(defun click-inside-selection-p (click)
+ (or (click-inside-extent-p click primary-selection-extent)
+ (click-inside-extent-p click zmacs-region-extent)
+ ))
+
+(defun point-inside-extent-p (extent)
+ "Return t if point is within the bounds of the primary selection extent.
+Return t is point is at the end position of the extent.
+Return nil otherwise."
+ ;; stig@hackvan.com
+ (and extent
+ (eq (current-buffer)
+ (extent-object extent))
+ (> (point) (extent-start-position extent))
+ (>= (extent-end-position extent) (point))))
+
+(defun point-inside-selection-p ()
+ ;; by Stig@hackvan.com
+ (or (point-inside-extent-p primary-selection-extent)
+ (point-inside-extent-p zmacs-region-extent)))
+
+(defun mouse-drag-or-yank (event)
+ "Either drag or paste the current selection.
+If the variable `mouse-yank-at-point' is non-nil,
+move the cursor to the location of the click before pasting.
+This functions has to be improved. Currently it is just a (working) test."
+ ;; by Oliver Graf <ograf@fga.de>
+ (interactive "e")
+ (if (click-inside-extent-p event zmacs-region-extent)
+ ;; okay, this is a drag
+ (cond ((featurep 'offix)
+ (offix-start-drag-region event
+ (extent-start-position zmacs-region-extent)
+ (extent-end-position zmacs-region-extent)))
+ ((featurep 'cde)
+ ;; should also work with CDE
+ (cde-start-drag-region event
+ (extent-start-position zmacs-region-extent)
+ (extent-end-position zmacs-region-extent)))
+ (t (error "No offix or CDE support compiled in")))
+ ;; no drag, call region-funct
+ (and (not mouse-yank-at-point)
+ (mouse-set-point event))
+ (funcall mouse-yank-function))
+ )
+
+(defun mouse-eval-sexp (click force-window)
+ "Evaluate the sexp under the mouse. Usually, this is the last sexp before
+the click, but if you click on a left paren, then it is the sexp beginning
+with the paren that is evaluated. Also, since strings evaluate to themselves,
+they're fed to re-search-forward and the matched region is highlighted until
+the mouse button is released.
+
+Perhaps the most useful thing about this function is that the evaluation of
+the expression which is clicked upon is relative not to the window where you
+click, but to the current window and the current position of point. Thus,
+you can use `mouse-eval-sexp' to interactively test code that acts upon a
+buffer...something you cannot do with the standard `eval-last-sexp' function.
+It's also fantastic for debugging regular expressions."
+ ;; by Stig@hackvan.com
+ (interactive "e\nP")
+ (let (exp val result-str)
+ (setq exp (save-window-excursion
+ (save-excursion
+ (mouse-set-point click)
+ (save-excursion
+ (or (looking-at "(") (forward-sexp -1))
+ (read (point-marker))))))
+ (cond ((stringp exp)
+ (if (setq val (re-search-forward exp nil t))
+ (let* ((oo (make-extent (match-beginning 0) (match-end 0))))
+ (set-extent-face oo 'highlight)
+ (set-extent-priority oo 1000)
+ ;; wait for button release...
+ (setq unread-command-event (next-command-event))
+ (delete-extent oo))
+ (message "Regex \"%s\" not found" exp)
+ (ding nil 'quiet)))
+ (t (setq val (if (fboundp 'eval-interactive)
+ (eval-interactive exp)
+ (eval exp)))))
+ (setq result-str (prin1-to-string val))
+ ;; #### -- need better test
+ (if (and (not force-window)
+ (<= (length result-str) (window-width (selected-window))))
+ (message "%s" result-str)
+ (with-output-to-temp-buffer "*Mouse-Eval*"
+ (condition-case nil
+ (pprint val)
+ (error (prin1 val))))
+ )))
+
+(defun mouse-line-length (event)
+ "Print the length of the line indicated by the pointer."
+ (interactive "@e")
+ (save-excursion
+ (mouse-set-point event)
+ (message "Line length: %d" (- (point-at-eol) (point-at-bol))))
+ (sleep-for 1))
+
+(defun mouse-set-mark (event)
+ "Select Emacs window mouse is on, and set mark at mouse position.
+Display cursor at that position for a second."
+ (interactive "@e")
+ (let ((point-save (point)))
+ (unwind-protect
+ (progn (mouse-set-point event)
+ (push-mark nil t)
+ (sit-for 1))
+ (goto-char point-save))))
+
+(defun mouse-scroll (event)
+ "Scroll point to the mouse position."
+ (interactive "@e")
+ (save-excursion
+ (mouse-set-point event)
+ (recenter 0)
+ (scroll-right (event-x event))))
+
+(defun mouse-del-char (event)
+ "Delete the char pointed to by the mouse."
+ (interactive "@e")
+ (save-excursion
+ (mouse-set-point event)
+ (delete-char 1 nil)))
+
+(defun mouse-kill-line (event)
+ "Kill the line pointed to by the mouse."
+ (interactive "@e")
+ (save-excursion
+ (mouse-set-point event)
+ (kill-line nil)))
+
+(defun mouse-bury-buffer (event)
+ "Bury the buffer pointed to by the mouse, thus selecting the next one."
+ (interactive "e")
+ (save-selected-window
+ (select-window (event-window event))
+ (bury-buffer)))
+
+(defun mouse-unbury-buffer (event)
+ "Unbury and select the most recently buried buffer."
+ (interactive "e")
+ (save-selected-window
+ (select-window (event-window event))
+ (let* ((bufs (buffer-list))
+ (entry (1- (length bufs)))
+ val)
+ (while (not (setq val (nth entry bufs)
+ val (and (/= (aref (buffer-name val) 0)
+ ? )
+ val)))
+ (setq entry (1- entry)))
+ (switch-to-buffer val))))
+
+(defun narrow-window-to-region (m n)
+ "Narrow window to region between point and last mark"
+ (interactive "r")
+ (save-excursion
+ (save-restriction
+ (if (eq (selected-window) (next-window))
+ (split-window))
+ (goto-char m)
+ (recenter 0)
+ (if (eq (selected-window)
+ (if (zerop (minibuffer-depth))
+ (next-window)))
+ ()
+ (shrink-window (- (- (window-height) (count-lines m n)) 1))))))
+
+(defun mouse-window-to-region (event)
+ "Narrow window to region between cursor and mouse pointer."
+ (interactive "@e")
+ (let ((point-save (point)))
+ (unwind-protect
+ (progn (mouse-set-point event)
+ (push-mark nil t)
+ (sit-for 1))
+ (goto-char point-save)
+ (narrow-window-to-region (region-beginning) (region-end)))))
+
+(defun mouse-ignore ()
+ "Don't do anything."
+ (interactive))
+
+\f
+;;; mouse/selection tracking
+;;; generalized mouse-track
+
+(defvar default-mouse-track-normalize-point-function
+ 'default-mouse-track-normalize-point
+ "Function called to normalize position of point.
+Called with two arguments: TYPE depends on the number of times that the
+mouse has been clicked and is a member of `default-mouse-track-type-list',
+FORWARDP determines the direction in which the point should be moved.")
+
+(defvar mouse-track-down-hook nil
+ "Function or functions called when the user presses the mouse.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding. The functions will be
+called with two arguments: the button-press event and a click
+count (see `mouse-track-click-hook').
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+Note that most applications should take action when the mouse is
+released, not when it is pressed.'")
+
+(defvar mouse-track-drag-hook nil
+ "Function or functions called when the user drags the mouse.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding. The functions will be
+called with three arguments: the mouse-motion event, a click
+count (see `mouse-track-click-hook'), and whether the call to
+this hook occurred as a result of a drag timeout (see
+`mouse-track-scroll-delay').
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+Note that no calls to this function will be made until the user
+initiates a drag (i.e. moves the mouse more than a certain
+threshold in either the X or the Y direction, as defined by
+`mouse-track-x-threshold' and `mouse-track-y-threshold').
+
+See also `mouse-track-drag-up-hook'.")
+
+(defvar mouse-track-drag-up-hook nil
+ "Function or functions called when the user finishes a drag.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding. The functions will be
+called with two arguments: the button-press event and a click
+count (see `mouse-track-click-hook').
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+Note that this hook will not be invoked unless the user has
+initiated a drag, i.e. moved the mouse more than a certain threshold
+(see `mouse-track-drag-hook'). When this function is invoked,
+`mouse-track-drag-hook' will have been invoked at least once.
+
+See also `mouse-track-click-hook'.")
+
+(defvar mouse-track-click-hook nil
+ "Function or functions called when the user clicks the mouse.
+`Clicking' means pressing and releasing the mouse without having
+initiated a drag (i.e. without having moved more than a certain
+threshold -- see `mouse-track-drag-hook').
+
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding. The functions will be
+called with two arguments: the button-release event and a click
+count, which specifies the number of times that the mouse has been
+clicked in a series of clicks, each of which is separated by at most
+`mouse-track-multi-click-time'. This can be used to implement actions
+that are called on double clicks, triple clicks, etc.
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+See also `mouse-track-drag-up-hook.")
+
+(defvar mouse-track-up-hook nil
+ "Function or functions called when the user releases the mouse.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding. The functions will be
+called with two arguments: the button-release event and a click
+count (see `mouse-track-click-hook').
+
+For many applications, it is more appropriate to use one or both
+of `mouse-track-click-hook' and `mouse-track-drag-up-hook'.")
+
+(defvar mouse-track-cleanup-hook nil
+ "Function or functions called when `mouse-track' terminates.
+This hook will be called in all circumstances, even upon a
+non-local exit out of `mouse-track', and so is useful for
+doing cleanup work such as removing extents that may have
+been created during the operation of `mouse-track'.
+
+Unlike all of the other mouse-track hooks, this is a \"normal\"
+hook: the hook functions are called with no arguments, and
+all hook functions are called regardless of their return
+values.")
+
+(defcustom mouse-track-multi-click-time 400
+ "*Maximum number of milliseconds allowed between clicks for a multi-click.
+See `mouse-track-click-hook'."
+ :type 'integer
+ :group 'mouse)
+
+(defcustom mouse-track-scroll-delay 100
+ "Maximum of milliseconds between calls to `mouse-track-drag-hook'.
+If the user is dragging the mouse (i.e. the button is held down and
+a drag has been initiated) and does not move the mouse for this many
+milliseconds, the hook will be called with t as the value of the
+WAS-TIMEOUT parameter. This can be used to implement scrolling
+in a selection when the user drags the mouse out the window it
+was in.
+
+A value of nil disables the timeout feature."
+ :type '(choice integer (const :tag "Disabled" nil))
+ :group 'mouse)
+
+(defvar mouse-track-x-threshold '(face-width 'default)
+ "Minimum number of pixels in the X direction for a drag to be initiated.
+If the mouse is moved more than either the X or Y threshold while the
+button is held down (see also `mouse-track-y-threshold'), then a drag
+is initiated; otherwise the gesture is considered to be a click.
+See `mouse-track'.
+
+The value should be either a number of a form to be evaluated to
+produce a number.")
+
+(defvar mouse-track-y-threshold '(face-height 'default)
+ "Minimum number of pixels in the Y direction for a drag to be initiated.
+If the mouse is moved more than either the X or Y threshold while the
+button is held down (see also `mouse-track-x-threshold'), then a drag
+is initiated; otherwise the gesture is considered to be a click.
+See `mouse-track'.
+
+The value should be either a number of a form to be evaluated to
+produce a number.")
+
+;; these variables are private to mouse-track.
+(defvar mouse-track-up-time nil)
+(defvar mouse-track-up-x nil)
+(defvar mouse-track-up-y nil)
+(defvar mouse-track-timeout-id nil)
+(defvar mouse-track-click-count nil)
+
+(defun mouse-track-set-timeout (event)
+ (if mouse-track-timeout-id
+ (disable-timeout mouse-track-timeout-id))
+ (if mouse-track-scroll-delay
+ (setq mouse-track-timeout-id
+ (add-timeout (/ mouse-track-scroll-delay 1000.0)
+ 'mouse-track-scroll-undefined
+ (copy-event event)))))
+
+(defun mouse-track-run-hook (hook event &rest args)
+ ;; ugh, can't use run-hook-with-args-until-success because we have
+ ;; to get the value using symbol-value-in-buffer. Doing a
+ ;; save-excursion/set-buffer is wrong because the hook might want to
+ ;; change the buffer, but just doing a set-buffer is wrong because
+ ;; the hook might not want to change the buffer.
+ ;; #### What we need here is a Lisp interface to
+ ;; run_hook_with_args_in_buffer. Here is a poor man's version.
+ (let ((buffer (event-buffer event)))
+ (and mouse-grabbed-buffer (setq buffer mouse-grabbed-buffer))
+ (when buffer
+ (let ((value (symbol-value-in-buffer hook buffer nil)))
+ (if (and (listp value) (not (eq (car value) 'lambda)))
+ ;; List of functions.
+ (let (retval)
+ (while (and value (null retval))
+ ;; Found `t': should process default value. We could
+ ;; splice it into the buffer-local value, but that
+ ;; would cons, which is not a good thing for
+ ;; mouse-track hooks.
+ (if (eq (car value) t)
+ (let ((global (default-value hook)))
+ (if (and (listp global) (not (eq (car global) 'lambda)))
+ ;; List of functions.
+ (while (and global
+ (null (setq retval
+ (apply (car global) event args))))
+ (pop global))
+ ;; lambda
+ (setq retval (apply (car global) event args))))
+ (setq retval (apply (car value) event args)))
+ (pop value))
+ retval)
+ ;; lambda
+ (apply value event args))))))
+
+(defun mouse-track-scroll-undefined (random)
+ ;; the old implementation didn't actually define this function,
+ ;; and in normal use it won't ever be called because the timeout
+ ;; will either be removed before it fires or will be picked off
+ ;; with next-event and not dispatched. However, if you're
+ ;; attempting to debug a click-hook (which is pretty damn
+ ;; difficult to do), this function may get called.
+)
+
+(defun mouse-track (event)
+ "Make a selection with the mouse. This should be bound to a mouse button.
+The behavior of XEmacs during mouse selection is customizable using various
+hooks and variables: see `mouse-track-click-hook', `mouse-track-drag-hook',
+`mouse-track-drag-up-hook', `mouse-track-down-hook', `mouse-track-up-hook',
+`mouse-track-cleanup-hook', `mouse-track-multi-click-time',
+`mouse-track-scroll-delay', `mouse-track-x-threshold', and
+`mouse-track-y-threshold'.
+
+Default handlers are provided to implement standard selecting/positioning
+behavior. You can explicitly request this default behavior, and override
+any custom-supplied handlers, by using the function `mouse-track-default'
+instead of `mouse-track'.
+
+Default behavior is as follows:
+
+If you click-and-drag, the selection will be set to the region between the
+point of the initial click and the point at which you release the button.
+These positions need not be ordered.
+
+If you click-and-release without moving the mouse, then the point is moved
+and the selection is disowned (there will be no selection owner). The mark
+will be set to the previous position of point.
+
+If you double-click, the selection will extend by symbols instead of by
+characters. If you triple-click, the selection will extend by lines.
+
+If you drag the mouse off the top or bottom of the window, you can select
+pieces of text which are larger than the visible part of the buffer; the
+buffer will scroll as necessary.
+
+The selected text becomes the current X Selection. The point will be left
+at the position at which you released the button, and the mark will be left
+at the initial click position."
+ (interactive "e")
+ (let ((mouse-down t)
+ (xthresh (eval mouse-track-x-threshold))
+ (ythresh (eval mouse-track-y-threshold))
+ (orig-x (event-x-pixel event))
+ (orig-y (event-y-pixel event))
+ (buffer (event-buffer event))
+ (mouse-grabbed-buffer (event-buffer event))
+ mouse-moved)
+ (if (or (not mouse-track-up-x)
+ (not mouse-track-up-y)
+ (not mouse-track-up-time)
+ (> (- (event-timestamp event) mouse-track-up-time)
+ mouse-track-multi-click-time)
+ (> (abs (- mouse-track-up-x orig-x)) xthresh)
+ (> (abs (- mouse-track-up-y orig-y)) ythresh))
+ (setq mouse-track-click-count 1)
+ (setq mouse-track-click-count (1+ mouse-track-click-count)))
+ (if (not (event-window event))
+ (error "Not over a window."))
+ (mouse-track-run-hook 'mouse-track-down-hook
+ event mouse-track-click-count)
+ (unwind-protect
+ (while mouse-down
+ (setq event (next-event event))
+ (cond ((motion-event-p event)
+ (if (and (not mouse-moved)
+ (or (> (abs (- (event-x-pixel event) orig-x))
+ xthresh)
+ (> (abs (- (event-y-pixel event) orig-y))
+ ythresh)))
+ (setq mouse-moved t))
+ (if mouse-moved
+ (mouse-track-run-hook 'mouse-track-drag-hook
+ event mouse-track-click-count nil))
+ (mouse-track-set-timeout event))
+ ((and (timeout-event-p event)
+ (eq (event-function event)
+ 'mouse-track-scroll-undefined))
+ (if mouse-moved
+ (mouse-track-run-hook 'mouse-track-drag-hook
+ (event-object event) mouse-track-click-count t))
+ (mouse-track-set-timeout (event-object event)))
+ ((button-release-event-p event)
+ (setq mouse-track-up-time (event-timestamp event))
+ (setq mouse-track-up-x (event-x-pixel event))
+ (setq mouse-track-up-y (event-y-pixel event))
+ (setq mouse-down nil)
+ (mouse-track-run-hook 'mouse-track-up-hook
+ event mouse-track-click-count)
+ (if mouse-moved
+ (mouse-track-run-hook 'mouse-track-drag-up-hook
+ event mouse-track-click-count)
+ (mouse-track-run-hook 'mouse-track-click-hook
+ event mouse-track-click-count)))
+ ((or (key-press-event-p event)
+ (and (misc-user-event-p event)
+ (eq (event-function event) 'cancel-mode-internal)))
+ (error "Selection aborted"))
+ (t
+ (dispatch-event event))))
+ ;; protected
+ (if mouse-track-timeout-id
+ (disable-timeout mouse-track-timeout-id))
+ (setq mouse-track-timeout-id nil)
+ (and buffer
+ (save-excursion
+ (set-buffer buffer)
+ (run-hooks 'mouse-track-cleanup-hook))))))
+
+\f
+;;;;;;;;;;;; default handlers: new version of mouse-track
+
+(defvar default-mouse-track-type nil)
+(defvar default-mouse-track-type-list '(char word line))
+(defvar default-mouse-track-window nil)
+(defvar default-mouse-track-extent nil)
+(defvar default-mouse-track-adjust nil)
+(defvar default-mouse-track-min-anchor nil)
+(defvar default-mouse-track-max-anchor nil)
+(defvar default-mouse-track-result nil)
+(defvar default-mouse-track-down-event nil)
+
+;; D. Verna Feb. 17 1998
+;; This function used to assume that when (event-window event) differs from
+;; window, we have to scroll. This is WRONG, for instance when there are
+;; toolbars on the side, in which case window-event returns nil.
+(defun default-mouse-track-set-point-in-window (event window)
+ (if (event-over-modeline-p event)
+ nil ;; Scroll
+ ;; Not over a modeline
+ (if (eq (event-window event) window)
+ (let ((p (event-closest-point event)))
+ (if (or (not p) (not (pos-visible-in-window-p p window)))
+ nil ;; Scroll
+ (mouse-set-point event)
+ t))
+ ;; Not over a modeline, not the same window. Check if the Y position
+ ;; is still overlapping the original window.
+ (let* ((edges (window-pixel-edges window))
+ (row (event-y-pixel event))
+ (text-start (nth 1 edges))
+ (text-end (+ (nth 3 edges))))
+ (if (or (< row text-start)
+ (> row text-end))
+ nil ;; Scroll
+ ;; The Y pos in overlapping the original window. Check however if
+ ;; the position is really visible, because there could be a
+ ;; scrollbar or a modeline at this place.
+ ;; Find the mean line height (height / lines nb), and approximate
+ ;; the line number for Y pos.
+ (select-window window)
+ (let ((line (/ (* (- row text-start) (window-height))
+ (- text-end text-start))))
+ (if (not (save-excursion
+ (goto-char (window-start))
+ (pos-visible-in-window-p
+ (point-at-bol (+ 1 line)))))
+ nil ;; Scroll
+ ;; OK, we can go to that position
+ (goto-char (window-start))
+ (forward-line line)
+ ;; On the right side: go to end-of-line.
+ (when (>= (event-x-pixel event) (nth 2 edges))
+ (goto-char (point-at-eol)))
+ t))))
+ )))
+
+
+(defun default-mouse-track-scroll-and-set-point (event window)
+ (select-window window)
+ (let ((edges (window-pixel-edges window))
+ (row (event-y-pixel event))
+ (height (face-height 'default)))
+ (cond ((< (abs (- row (nth 1 edges))) (abs (- row (nth 3 edges))))
+ ;; closer to window's top than to bottom, so move up
+ (let ((delta (max 1 (/ (- (nth 1 edges) row) height))))
+ (condition-case () (scroll-down delta) (error))
+ (goto-char (window-start))))
+ ((>= (point) (point-max)))
+ (t
+ ;; scroll by one line if over the modeline or a clipped line
+ (let ((delta (if (or (event-over-modeline-p event)
+ (< row (nth 3 edges)))
+ 1
+ (+ (/ (- row (nth 3 edges)) height) 1)))
+ (close-pos (event-closest-point event)))
+ (condition-case () (scroll-up delta) (error))
+ (if (and close-pos (pos-visible-in-window-p close-pos))
+ (goto-char close-pos)
+ (goto-char (window-end))
+ (vertical-motion delta)
+ ;; window-end reports the end of the clipped line, even if
+ ;; scroll-on-clipped-lines is t. compensate.
+ ;; (If window-end gets fixed this can be removed.)
+ (if (not (pos-visible-in-window-p (max (1- (point))
+ (point-min))))
+ (vertical-motion -1))
+ (condition-case () (backward-char 1)
+ (error (end-of-line)))))))))
+
+
+;; This remembers the last position at which the user clicked, for the
+;; benefit of mouse-track-adjust (for example, button1; scroll until the
+;; position of the click is off the frame; then Sh-button1 to select the
+;; new region.
+(defvar default-mouse-track-previous-point nil)
+
+(defun default-mouse-track-set-point (event window)
+ (if (default-mouse-track-set-point-in-window event window)
+ nil
+ (default-mouse-track-scroll-and-set-point event window)))
+
+(defsubst default-mouse-track-beginning-of-word (symbolp)
+ (let ((word-constituent (cond ((eq symbolp t) "\\w\\|\\s_\\|\\s'")
+ ((null symbolp) "\\w")
+ (t "[^ \t\n]")))
+ (white-space "[ \t]"))
+ (cond ((bobp) nil)
+ ((looking-at word-constituent)
+ (backward-char)
+ (while (and (not (bobp)) (looking-at word-constituent))
+ (backward-char))
+ (if (or (not (bobp)) (not (looking-at word-constituent)))
+ (forward-char)))
+ ((looking-at white-space)
+ (backward-char)
+ (while (looking-at white-space)
+ (backward-char))
+ (forward-char)))))
+
+(defun default-mouse-track-end-of-word (symbolp)
+ (let ((word-constituent (cond ((eq symbolp t) "\\w\\|\\s_\\|\\s'")
+ ((null symbolp) "\\w")
+ (t "[^ \t\n]")))
+ (white-space "[ \t]"))
+ (cond ((looking-at word-constituent) ; word or symbol constituent
+ (while (looking-at word-constituent)
+ (forward-char)))
+ ((looking-at white-space) ; word or symbol constituent
+ (while (looking-at white-space)
+ (forward-char))))))
+
+;; Decide what will be the SYMBOLP argument to
+;; default-mouse-track-{beginning,end}-of-word, according to the
+;; syntax of the current character and value of mouse-highlight-text.
+(defsubst default-mouse-symbolp (syntax)
+ (cond ((eq mouse-highlight-text 'context)
+ (eq syntax ?_))
+ ((eq mouse-highlight-text 'symbol)
+ t)
+ (t
+ nil)))
+
+(defun default-mouse-track-normalize-point (type forwardp)
+ (cond ((eq type 'word)
+ ;; trap the beginning and end of buffer errors
+ (ignore-errors
+ (setq type (char-syntax (char-after (point))))
+ (if forwardp
+ (if (= type ?\()
+ (goto-char (scan-sexps (point) 1))
+ (if (= type ?\))
+ (forward-char 1)
+ (default-mouse-track-end-of-word
+ (default-mouse-symbolp type))))
+ (if (= type ?\))
+ (goto-char (scan-sexps (1+ (point)) -1))
+ (default-mouse-track-beginning-of-word
+ (default-mouse-symbolp type))))))
+ ((eq type 'line)
+ (if forwardp (end-of-line) (beginning-of-line)))
+ ((eq type 'buffer)
+ (if forwardp (end-of-buffer) (beginning-of-buffer)))))
+
+(defun default-mouse-track-next-move (min-anchor max-anchor extent)
+ (let ((anchor (if (<= (point) min-anchor) max-anchor min-anchor)))
+ (funcall default-mouse-track-normalize-point-function
+ default-mouse-track-type (> (point) anchor))
+ (if (consp extent)
+ (default-mouse-track-next-move-rect anchor (point) extent)
+ (if extent
+ (if (<= anchor (point))
+ (set-extent-endpoints extent anchor (point))
+ (set-extent-endpoints extent (point) anchor))))))
+
+(defun default-mouse-track-next-move-rect (start end extents &optional pad-p)
+ (if (< end start)
+ (let ((tmp start)) (setq start end end tmp)))
+ (cond
+ ((= start end) ; never delete the last remaining extent
+ (mapcar 'delete-extent (cdr extents))
+ (setcdr extents nil)
+ (set-extent-endpoints (car extents) start start))
+ (t
+ (let ((indent-tabs-mode nil) ; if pad-p, don't use tabs
+ (rest extents)
+ left right last p)
+ (save-excursion
+ (save-restriction
+ (goto-char end)
+ (setq right (current-column))
+ (goto-char start)
+ (setq left (current-column))
+ (if (< right left)
+ (let ((tmp left))
+ (setq left right right tmp)
+ (setq start (- start (- right left))
+ end (+ end (- right left)))))
+ ;; End may have been set to a value greater than point-max if drag
+ ;; or movement extends to end of buffer, so reset it.
+ (setq end (min end (point-max)))
+ (beginning-of-line)
+ (narrow-to-region (point) end)
+ (goto-char start)
+ (while (and rest (not (eobp)))
+ (setq p (point))
+ (move-to-column right pad-p)
+ (set-extent-endpoints (car rest) p (point))
+ ;; this code used to look at the return value
+ ;; of forward-line, but that doesn't work because
+ ;; forward-line has bogus behavior: If you're on
+ ;; the last line of a buffer but not at the very
+ ;; end, forward-line will move you to the very
+ ;; end and return 0 instead of 1, like it should.
+ ;; the result was frequent infinite loops here,
+ ;; creating very large numbers of extents at
+ ;; the same position. There was an N^2 sorting
+ ;; algorithm in extents.c for extents at a
+ ;; particular position, and the result was very
+ ;; bad news.
+ (forward-line 1)
+ (if (not (eobp))
+ (move-to-column left pad-p))
+ (setq last rest
+ rest (cdr rest)))
+ (cond (rest
+ (mapcar 'delete-extent rest)
+ (setcdr last nil))
+ ((not (eobp))
+ (while (not (eobp))
+ (setq p (point))
+ (move-to-column right pad-p)
+ (let ((e (make-extent p (point))))
+ (set-extent-face e (extent-face (car extents)))
+ (set-extent-priority e (extent-priority (car extents)))
+ (setcdr last (cons e nil))
+ (setq last (cdr last)))
+ (forward-line 1)
+ (if (not (eobp))
+ (move-to-column left pad-p))
+ )))))
+ ))))
+
+(defun default-mouse-track-has-selection-p (buffer)
+ (and (selection-owner-p)
+ (extent-live-p primary-selection-extent)
+ (not (extent-detached-p primary-selection-extent))
+ (eq buffer (extent-object primary-selection-extent))))
+
+(defun default-mouse-track-anchor (adjust previous-point)
+ (if adjust
+ (if (default-mouse-track-has-selection-p (current-buffer))
+ (let ((start (extent-start-position primary-selection-extent))
+ (end (extent-end-position primary-selection-extent)))
+ (cond ((< (point) start) end)
+ ((> (point) end) start)
+ ((> (- (point) start) (- end (point))) start)
+ (t end)))
+ previous-point)
+ (point)))
+
+(defun default-mouse-track-maybe-own-selection (pair type)
+ (let ((start (car pair))
+ (end (cdr pair)))
+ (or (= start end) (push-mark (if (= (point) start) end start)))
+ (cond (zmacs-regions
+ (if (= start end)
+ nil
+ ;; #### UTTER KLUDGE.
+ ;; If we don't have this sit-for here, then triple-clicking
+ ;; will result in the line not being highlighted as it
+ ;; should. What appears to be happening is this:
+ ;;
+ ;; -- each time the button goes down, the selection is
+ ;; disowned (see comment "remove the existing selection
+ ;; to unclutter the display", below).
+ ;; -- this causes a SelectionClear event to be sent to
+ ;; XEmacs.
+ ;; -- each time the button goes up except the first, the
+ ;; selection is owned again.
+ ;; -- later, XEmacs processes the SelectionClear event.
+ ;; The selection code attempts to keep track of the
+ ;; time that it last asserted the selection, and
+ ;; compare it to the time of the SelectionClear event,
+ ;; to see if it's a bogus notification or not (as
+ ;; is the case here). However, for some unknown
+ ;; reason this doesn't work in the triple-clicking
+ ;; case, and the selection code bogusly thinks this
+ ;; SelectionClear event is the real thing.
+ ;; -- putting the sit-for in causes the pending
+ ;; SelectionClear events to get processed before
+ ;; the selection is reasserted, so everything works
+ ;; out OK.
+ ;;
+ ;; Presumably(?) this means there is a weird timing bug
+ ;; in the selection code, but there's not a chance in hell
+ ;; that I have the patience to track it down. Blame the
+ ;; designers of X for fucking everything up so badly.
+ ;;
+ ;; This was originally a sit-for 0 but that wasn't
+ ;; sufficient to make things work. Even this isn't
+ ;; always sufficient but it seems to give something
+ ;; approaching a 99% success rate. Making it higher yet
+ ;; would help guarantee success with the price that the
+ ;; delay would start to become noticable.
+ ;;
+ (and (eq (console-type) 'x)
+ (sit-for 0.15 t))
+ (zmacs-activate-region)))
+ ((console-on-window-system-p)
+ (if (= start end)
+ (disown-selection type)
+ (if (consp default-mouse-track-extent)
+ ;; own the rectangular region
+ ;; this is a hack
+ (let ((r default-mouse-track-extent))
+ (save-excursion
+ (set-buffer (get-buffer-create " *rect yank temp buf*"))
+ (while r
+ (insert (extent-string (car r)) "\n")
+ (setq r (cdr r)))
+ (own-selection (buffer-substring (point-min) (point-max)))
+ (kill-buffer (current-buffer))))
+ (own-selection (cons (set-marker (make-marker) start)
+ (set-marker (make-marker) end))
+ type)))))
+ (if (and (eq 'x (console-type))
+ (not (= start end)))
+ ;; I guess cutbuffers should do something with rectangles too.
+ ;; does anybody use them?
+ (x-store-cutbuffer (buffer-substring start end)))))
+
+(defun default-mouse-track-deal-with-down-event (click-count)
+ (let ((event default-mouse-track-down-event))
+ (if (null event) nil
+ (select-frame (event-frame event))
+ (let ((adjust default-mouse-track-adjust)
+ ;; ####When you click on the splash-screen,
+ ;; event-{closest-,}point can be out of bounds. Should
+ ;; event-closest-point really be allowed to return a bad
+ ;; position like that? Maybe pixel_to_glyph_translation
+ ;; needs to invalidate its cache when the buffer changes.
+ ;; -dkindred@cs.cmu.edu
+ (close-pos (save-excursion
+ (set-buffer (event-buffer event))
+ (let ((p (event-closest-point event)))
+ (and p (min (max p (point-min)) (point-max))))))
+ extent previous-point)
+
+ (if (not (event-window event))
+ (error "not over window?"))
+ (setq default-mouse-track-type
+ (nth (mod (1- click-count)
+ (length default-mouse-track-type-list))
+ default-mouse-track-type-list))
+ (setq default-mouse-track-window (event-window event))
+ ;; Note that the extent used here is NOT the extent which
+ ;; ends up as the value of zmacs-region-extent - this one is used
+ ;; just during mouse-dragging.
+ (setq default-mouse-track-extent
+ (make-extent close-pos close-pos (event-buffer event)))
+ (setq extent default-mouse-track-extent)
+ (set-extent-face extent 'zmacs-region)
+ ;; While the selection is being dragged out, give the selection extent
+ ;; slightly higher priority than any mouse-highlighted extent, so that
+ ;; the exact endpoints of the selection will be visible while the mouse
+ ;; is down. Normally, the selection and mouse highlighting have the
+ ;; same priority, so that conflicts between the two of them are
+ ;; resolved by the usual size-and-endpoint-comparison method.
+ (set-extent-priority extent (1+ mouse-highlight-priority))
+ (if mouse-track-rectangle-p
+ (setq default-mouse-track-extent
+ (list default-mouse-track-extent)))
+
+ (setq previous-point
+ (if (and adjust
+ (markerp default-mouse-track-previous-point)
+ (eq (current-buffer)
+ (marker-buffer default-mouse-track-previous-point)))
+ (marker-position default-mouse-track-previous-point)
+ (point)))
+ (default-mouse-track-set-point event default-mouse-track-window)
+ (if (not adjust)
+ (if (markerp default-mouse-track-previous-point)
+ (set-marker default-mouse-track-previous-point (point))
+ (setq default-mouse-track-previous-point (point-marker))))
+ ;;
+ ;; adjust point to a word or line boundary if appropriate
+ (let ((anchor (default-mouse-track-anchor adjust previous-point)))
+ (setq default-mouse-track-min-anchor
+ (save-excursion (goto-char anchor)
+ (funcall
+ default-mouse-track-normalize-point-function
+ default-mouse-track-type nil)
+ (point)))
+ (setq default-mouse-track-max-anchor
+ (save-excursion (goto-char anchor)
+ (funcall
+ default-mouse-track-normalize-point-function
+ default-mouse-track-type t)
+ (point))))
+ ;;
+ ;; remove the existing selection to unclutter the display
+ (if (not adjust)
+ (cond (zmacs-regions
+ (zmacs-deactivate-region))
+ ((console-on-window-system-p)
+ (disown-selection)))))
+ (setq default-mouse-track-down-event nil))))
+
+(defun default-mouse-track-down-hook (event click-count)
+ (setq default-mouse-track-down-event (copy-event event))
+ nil)
+
+(defun default-mouse-track-cleanup-extents-hook ()
+ (remove-hook 'pre-command-hook 'default-mouse-track-cleanup-extents-hook)
+ (let ((extent default-mouse-track-extent))
+ (if (consp extent) ; rectangle-p
+ (mapcar 'delete-extent extent)
+ (if extent
+ (delete-extent extent)))))
+
+(defun default-mouse-track-cleanup-hook ()
+ (if zmacs-regions
+ (funcall 'default-mouse-track-cleanup-extents-hook)
+ (let ((extent default-mouse-track-extent)
+ (func #'(lambda (e)
+ (and (extent-live-p e)
+ (set-extent-face e 'primary-selection)))))
+ (add-hook 'pre-command-hook 'default-mouse-track-cleanup-extents-hook)
+ (if (consp extent) ; rectangle-p
+ (mapcar func extent)
+ (if extent
+ (funcall func extent))))))
+
+(defun default-mouse-track-cleanup-extent ()
+ (let ((dead-func
+ (function (lambda (x)
+ (or (not (extent-live-p x))
+ (extent-detached-p x)))))
+ (extent default-mouse-track-extent))
+ (if (consp extent)
+ (if (funcall dead-func extent)
+ (let (newval)
+ (mapcar (function (lambda (x)
+ (if (not (funcall dead-func x))
+ (setq newval (cons x newval)))))
+ extent)
+ (setq default-mouse-track-extent (nreverse newval))))
+ (if (funcall dead-func extent)
+ (setq default-mouse-track-extent nil)))))
+
+(defun default-mouse-track-drag-hook (event click-count was-timeout)
+ (default-mouse-track-deal-with-down-event click-count)
+ (default-mouse-track-set-point event default-mouse-track-window)
+ (default-mouse-track-cleanup-extent)
+ (default-mouse-track-next-move default-mouse-track-min-anchor
+ default-mouse-track-max-anchor
+ default-mouse-track-extent)
+ t)
+
+(defun default-mouse-track-return-dragged-selection (event)
+ (default-mouse-track-cleanup-extent)
+ (let ((extent default-mouse-track-extent)
+ result)
+ (default-mouse-track-set-point-in-window event default-mouse-track-window)
+ (default-mouse-track-next-move default-mouse-track-min-anchor
+ default-mouse-track-max-anchor
+ extent)
+ (cond ((consp extent) ; rectangle-p
+ (let ((first (car extent))
+ (last (car (setq extent (nreverse extent)))))
+ ;; nreverse is destructive so we need to reset this
+ (setq default-mouse-track-extent extent)
+ (setq result (cons (extent-start-position first)
+ (extent-end-position last)))
+ ;; kludge to fix up region when dragging backwards...
+ (if (and (/= (point) (extent-start-position first))
+ (/= (point) (extent-end-position last))
+ (= (point) (extent-end-position first)))
+ (goto-char (car result)))))
+ (extent
+ (setq result (cons (extent-start-position extent)
+ (extent-end-position extent)))))
+ ;; Minor kludge: if we're selecting in line-mode, include the
+ ;; final newline. It's hard to do this in *-normalize-point.
+ (if (and result (eq default-mouse-track-type 'line))
+ (let ((end-p (= (point) (cdr result))))
+ (goto-char (cdr result))
+ (if (not (eobp))
+ (setcdr result (1+ (cdr result))))
+ (goto-char (if end-p (cdr result) (car result)))))
+;;; ;; Minor kludge sub 2. If in char mode, and we drag the
+;;; ;; mouse past EOL, include the newline.
+;;; ;;
+;;; ;; Major problem: can't easily distinguish between being
+;;; ;; just past the last char on a line, and well past it,
+;;; ;; to determine whether or not to include it in the region
+;;; ;;
+;;; (if nil ; (eq default-mouse-track-type 'char)
+;;; (let ((after-end-p (and (not (eobp))
+;;; (eolp)
+;;; (> (point) (car result)))))
+;;; (if after-end-p
+;;; (progn
+;;; (setcdr result (1+ (cdr result)))
+;;; (goto-char (cdr result))))))
+ result))
+
+(defun default-mouse-track-drag-up-hook (event click-count)
+ (let ((result (default-mouse-track-return-dragged-selection event)))
+ (if result
+ (default-mouse-track-maybe-own-selection result 'PRIMARY)))
+ t)
+
+(defun default-mouse-track-click-hook (event click-count)
+ (default-mouse-track-drag-hook event click-count nil)
+ (default-mouse-track-drag-up-hook event click-count)
+ t)
+
+(add-hook 'mouse-track-down-hook 'default-mouse-track-down-hook)
+(add-hook 'mouse-track-drag-hook 'default-mouse-track-drag-hook)
+(add-hook 'mouse-track-drag-up-hook 'default-mouse-track-drag-up-hook)
+(add-hook 'mouse-track-click-hook 'default-mouse-track-click-hook)
+(add-hook 'mouse-track-cleanup-hook 'default-mouse-track-cleanup-hook)
+
+\f
+;;;;;;;;;;;; other mouse-track stuff (mostly associated with the
+;;;;;;;;;;;; default handlers)
+
+(defun mouse-track-default (event)
+ "Invoke `mouse-track' with only the default handlers active."
+ (interactive "e")
+ (let ((mouse-track-down-hook 'default-mouse-track-down-hook)
+ (mouse-track-drag-hook 'default-mouse-track-drag-hook)
+ (mouse-track-drag-up-hook 'default-mouse-track-drag-up-hook)
+ (mouse-track-click-hook 'default-mouse-track-click-hook)
+ (mouse-track-cleanup-hook 'default-mouse-track-cleanup-hook))
+ (mouse-track event)))
+
+(defun mouse-track-do-rectangle (event)
+ "Like `mouse-track' but selects rectangles instead of regions."
+ (interactive "e")
+ (let ((mouse-track-rectangle-p t))
+ (mouse-track event)))
+
+(defun mouse-track-adjust (event)
+ "Extend the existing selection. This should be bound to a mouse button.
+The selection will be enlarged or shrunk so that the point of the mouse
+click is one of its endpoints. This function in fact behaves fairly
+similarly to `mouse-track', but begins by extending the existing selection
+(or creating a new selection from the previous text cursor position to
+the current mouse position) instead of creating a new, empty selection.
+
+The mouse-track handlers are run from this command just like from
+`mouse-track'. Therefore, do not call this command from a mouse-track
+handler!"
+ (interactive "e")
+ (let ((default-mouse-track-adjust t))
+ (mouse-track event)))
+
+(defun mouse-track-adjust-default (event)
+ "Extend the existing selection, using only the default handlers.
+This is just like `mouse-track-adjust' but will override any
+custom mouse-track handlers that the user may have installed."
+ (interactive "e")
+ (let ((default-mouse-track-adjust t))
+ (mouse-track-default event)))
+
+(defvar mouse-track-insert-selected-region nil)
+
+(defun mouse-track-insert-drag-up-hook (event click-count)
+ (setq mouse-track-insert-selected-region
+ (default-mouse-track-return-dragged-selection event)))
+
+(defun mouse-track-insert (event &optional delete)
+ "Make a selection with the mouse and insert it at point.
+This is exactly the same as the `mouse-track' command on \\[mouse-track],
+except that point is not moved; the selected text is immediately inserted
+after being selected\; and the selection is immediately disowned afterwards."
+ (interactive "*e")
+ (setq mouse-track-insert-selected-region nil)
+ (let ((mouse-track-drag-up-hook 'mouse-track-insert-drag-up-hook)
+ (mouse-track-click-hook 'mouse-track-insert-click-hook)
+ s)
+ (save-excursion
+ (save-window-excursion
+ (mouse-track event)
+ (if (consp mouse-track-insert-selected-region)
+ (let ((pair mouse-track-insert-selected-region))
+ (setq s (prog1
+ (buffer-substring (car pair) (cdr pair))
+ (if delete
+ (kill-region (car pair) (cdr pair)))))))))
+ (or (null s) (equal s "") (insert s))))
+
+(defun mouse-track-insert-click-hook (event click-count)
+ (default-mouse-track-drag-hook event click-count nil)
+ (mouse-track-insert-drag-up-hook event click-count)
+ t)
+
+(defun mouse-track-delete-and-insert (event)
+ "Make a selection with the mouse and insert it at point.
+This is exactly the same as the `mouse-track' command on \\[mouse-track],
+except that point is not moved; the selected text is immediately inserted
+after being selected\; and the text of the selection is deleted."
+ (interactive "*e")
+ (mouse-track-insert event t))
+
+;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+(defvar inhibit-help-echo nil
+ "Inhibits display of `help-echo' extent properties in the minibuffer.")
+(defvar last-help-echo-object nil)
+(defvar help-echo-owns-message nil)
+
+(defun clear-help-echo (&optional ignored-frame)
+ (if help-echo-owns-message
+ (progn
+ (setq help-echo-owns-message nil
+ last-help-echo-object nil)
+ (clear-message 'help-echo))))
+
+(defun show-help-echo (mess)
+ ;; (clear-help-echo)
+ (setq help-echo-owns-message t)
+ (display-message 'help-echo mess))
+
+(add-hook 'mouse-leave-frame-hook 'clear-help-echo)
+
+;; It may be a good idea to move this to C, for better performance of
+;; extent highlighting and pointer changes.
+(defun default-mouse-motion-handler (event)
+ "For use as the value of `mouse-motion-handler'.
+This implements the various pointer-shape variables,
+as well as extent highlighting, help-echo, toolbar up/down,
+and `mode-motion-hook'."
+ (let* ((frame (or (event-frame event) (selected-frame)))
+ (window (event-window event))
+ (buffer (event-buffer event))
+ (modeline-point (and buffer (event-modeline-position event)))
+ (modeline-string (and modeline-point
+ (symbol-value-in-buffer
+ 'generated-modeline-string buffer)))
+ ;; point must be invalidated by modeline-point.
+ (point (and buffer (not modeline-point)
+ (event-point event)))
+ (extent (or (and point
+ (extent-at point buffer 'mouse-face))
+ (and modeline-point
+ (extent-at modeline-point modeline-string
+ ;; Modeline extents don't have a
+ ;; mouse-face property set.
+ 'help-echo))))
+ (glyph-extent1 (event-glyph-extent event))
+ (glyph-extent (and glyph-extent1
+ (extent-live-p glyph-extent1)
+ glyph-extent1))
+ ;; This is an extent:
+ (user-pointer1 (or (and glyph-extent
+ (extent-property glyph-extent 'pointer)
+ glyph-extent)
+ (and point (extent-at point buffer 'pointer))
+ (and modeline-point
+ (extent-at modeline-point modeline-string
+ 'pointer))))
+ ;; And this should be a glyph:
+ (user-pointer (and user-pointer1 (extent-live-p user-pointer1)
+ (extent-property user-pointer1 'pointer)))
+ (button (event-toolbar-button event))
+ (help (or (and glyph-extent (extent-property glyph-extent 'help-echo)
+ glyph-extent)
+ (and button (not (null (toolbar-button-help-string button)))
+ button)
+ (and point
+ (extent-at point buffer 'help-echo))
+ (and modeline-point
+ (extent-at modeline-point modeline-string
+ 'help-echo))))
+ ;; vars is a list of glyph variables to check for a pointer
+ ;; value.
+ (vars (cond
+ ;; Checking if button is non-nil is not sufficent
+ ;; since the pointer could be over a blank portion
+ ;; of the toolbar.
+ ((event-over-toolbar-p event)
+ '(toolbar-pointer-glyph nontext-pointer-glyph
+ text-pointer-glyph))
+ ((or extent glyph-extent)
+ '(selection-pointer-glyph text-pointer-glyph))
+ ((event-over-modeline-p event)
+ '(modeline-pointer-glyph nontext-pointer-glyph
+ text-pointer-glyph))
+ ((and (event-over-vertical-divider-p event)
+ ;; #### I disagree with the check below.
+ ;; Discuss it with Kirill for 21.1. --hniksic
+ (specifier-instance vertical-divider-always-visible-p
+ (event-window event)))
+ '(divider-pointer-glyph nontext-pointer-glyph
+ text-pointer-glyph))
+ (point '(text-pointer-glyph))
+ (buffer '(nontext-pointer-glyph text-pointer-glyph))
+ (t '(nontext-pointer-glyph text-pointer-glyph))))
+ pointer)
+ (and user-pointer (glyphp user-pointer)
+ (push 'user-pointer vars))
+ (while (and vars (not (pointer-image-instance-p pointer)))
+ (setq pointer (glyph-image-instance (symbol-value (car vars))
+ (or window frame))
+ vars (cdr vars)))
+
+ (if (pointer-image-instance-p pointer)
+ (set-frame-pointer frame pointer))
+
+ ;; If last-pressed-toolbar-button is not nil, then check and see
+ ;; if we have moved to a new button and adjust the down flags
+ ;; accordingly.
+ (when (and (featurep 'toolbar) toolbar-active)
+ (unless (eq last-pressed-toolbar-button button)
+ (release-previous-toolbar-button event)
+ (and button (press-toolbar-button event))))
+
+ (cond (extent (highlight-extent extent t))
+ (glyph-extent (highlight-extent glyph-extent t))
+ (t (highlight-extent nil nil)))
+ (cond ((extentp help)
+ (or inhibit-help-echo
+ (eq help last-help-echo-object) ;save some time
+ (let ((hprop (extent-property help 'help-echo)))
+ (setq last-help-echo-object help)
+ (or (stringp hprop)
+ (setq hprop (funcall hprop help)))
+ (and hprop (show-help-echo hprop)))))
+ ((and (featurep 'toolbar)
+ (toolbar-button-p help)
+ (toolbar-button-enabled-p help))
+ (or (not toolbar-help-enabled)
+ (eq help last-help-echo-object) ;save some time
+ (let ((hstring (toolbar-button-help-string button)))
+ (setq last-help-echo-object help)
+ (or (stringp hstring)
+ (setq hstring (funcall hstring help)))
+ (show-help-echo hstring))))
+ (last-help-echo-object
+ (clear-help-echo)))
+ (if mouse-grabbed-buffer (setq buffer mouse-grabbed-buffer))
+ (if (and buffer (symbol-value-in-buffer 'mode-motion-hook buffer nil))
+ (with-current-buffer buffer
+ (run-hook-with-args 'mode-motion-hook event)
+
+ ;; If the mode-motion-hook created a highlightable extent around
+ ;; the mouse-point, highlight it right away. Otherwise it wouldn't
+ ;; be highlighted until the *next* motion event came in.
+ (if (and point
+ (null extent)
+ (setq extent (extent-at point
+ (event-buffer event) ; not buffer
+ 'mouse-face)))
+ (highlight-extent extent t)))))
+ nil)
+
+(setq mouse-motion-handler 'default-mouse-motion-handler)
+\f
+;;
+;; Vertical divider dragging
+;;
+(defun drag-window-divider (event)
+ "Handle resizing windows by dragging window dividers.
+This is an intenal function, normally bound to button1 event in
+window-divider-map. You would not call it, but you may bind it to
+other mouse buttons."
+ (interactive "e")
+ ;; #### I disagree with the check below.
+ ;; Discuss it with Kirill for 21.1. --hniksic
+ (if (not (specifier-instance vertical-divider-always-visible-p
+ (event-window event)))
+ (error "Not over a window"))
+ (let-specifier ((vertical-divider-shadow-thickness
+ (- (specifier-instance vertical-divider-shadow-thickness
+ (event-window event)))
+ (event-window event)))
+ (let* ((window (event-window event))
+ (frame (event-channel event))
+ (last-timestamp (event-timestamp event))
+ done)
+ (while (not done)
+ (let* ((edges (window-pixel-edges window))
+ (old-right (caddr edges))
+ (old-left (car edges))
+ (backup-conf (current-window-configuration frame))
+ (old-edges-all-windows (mapcar 'window-pixel-edges
+ (window-list))))
+
+ ;; This is borrowed from modeline.el:
+ ;; requeue event and quit if this is a misc-user, eval or
+ ;; keypress event.
+ ;; quit if this is a button press or release event, or if the event
+ ;; occurred in some other frame.
+ ;; drag if this is a mouse motion event and the time
+ ;; between this event and the last event is greater than
+ ;; drag-divider-event-lag.
+ ;; do nothing if this is any other kind of event.
+ (setq event (next-event event))
+ (cond ((or (misc-user-event-p event)
+ (key-press-event-p event))
+ (setq unread-command-events (nconc unread-command-events
+ (list event))
+ done t))
+ ((button-release-event-p event)
+ (setq done t))
+ ((button-event-p event)
+ (setq done t))
+ ((not (motion-event-p event))
+ (dispatch-event event))
+ ((not (eq frame (event-frame event)))
+ (setq done t))
+ ((< (abs (- (event-timestamp event) last-timestamp))
+ drag-divider-event-lag))
+ (t
+ (setq last-timestamp (event-timestamp event))
+ ;; Enlarge the window, calculating change in characters
+ ;; of default font. Do not let the window to become
+ ;; less than alolwed minimum (not because that's critical
+ ;; for the code performance, just the visual effect is
+ ;; better: when cursor goes to the left of the next left
+ ;; divider, the vindow being resized shrinks to minimal
+ ;; size.
+ (enlarge-window (max (- window-min-width (window-width window))
+ (/ (- (event-x-pixel event) old-right)
+ (face-width 'default window)))
+ t window)
+ ;; Backout the change if some windows got deleted, or
+ ;; if the change caused more than two windows to resize
+ ;; (shifting the whole stack right is ugly), or if the
+ ;; left window side has slipped (right side cannot be
+ ;; moved any funrther to the right, so enlarge-window
+ ;; plays bad games with the left edge.
+ (if (or (/= (count-windows) (length old-edges-all-windows))
+ (/= old-left (car (window-pixel-edges window)))
+ ;; This check is very hairy. We allow any number
+ ;; of left edges to change, but only to the same
+ ;; new value. Similar procedure is for the right edges.
+ (let ((all-that-bad nil)
+ (new-left-ok nil)
+ (new-right-ok nil))
+ (mapcar* (lambda (window old-edges)
+ (let ((new (car (window-pixel-edges window))))
+ (if (/= new (car old-edges))
+ (if (and new-left-ok
+ (/= new-left-ok new))
+ (setq all-that-bad t)
+ (setq new-left-ok new)))))
+ (window-list) old-edges-all-windows)
+ (mapcar* (lambda (window old-edges)
+ (let ((new (caddr (window-pixel-edges window))))
+ (if (/= new (caddr old-edges))
+ (if (and new-right-ok
+ (/= new-right-ok new))
+ (setq all-that-bad t)
+ (setq new-right-ok new)))))
+ (window-list) old-edges-all-windows)
+ all-that-bad))
+ (set-window-configuration backup-conf)))))))))
+
+(setq vertical-divider-map (make-keymap))
+(define-key vertical-divider-map 'button1 'drag-window-divider)
+
+;;; mouse.el ends here
projects / chise / xemacs-chise.git.1 / blobdiff