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1 ;; Mode-specific mouse-highlighting of text.
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2 ;; Copyright (C) 1992, 1993 Free Software Foundation, Inc.
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3
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4 ;; This file is part of XEmacs.
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5
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6 ;; XEmacs is free software; you can redistribute it and/or modify it
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7 ;; under the terms of the GNU General Public License as published by
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8 ;; the Free Software Foundation; either version 2, or (at your option)
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9 ;; any later version.
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10
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11 ;; XEmacs is distributed in the hope that it will be useful, but
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12 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ;; General Public License for more details.
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15
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16 ;; You should have received a copy of the GNU General Public License
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17 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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18 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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19
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20 ;;; Synched up with: Not in FSF.
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21
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22 (defvar mode-motion-hook nil
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23 "Function or functions which are called whenever the mouse moves.
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24 You should normally use this rather than `mouse-motion-handler', which
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25 does some additional window-system-dependent things. This hook is local
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26 to every buffer, and should normally be set up by major-modes which want
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27 to use special highlighting. Every time the mouse moves over a window,
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28 the mode-motion-hook of the buffer of that window is run.")
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29
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30 (make-variable-buffer-local 'mode-motion-hook)
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31
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32 (defvar mode-motion-extent nil)
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33 (make-variable-buffer-local 'mode-motion-extent)
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34
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35 (defvar mode-motion-help-echo-string nil
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36 "String to be added as the 'help-echo property of the mode-motion extent.
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37 In order for this to work, you need to add the hook function
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38 `mode-motion-add-help-echo' to the mode-motion hook. If this is a function,
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39 it will be called with one argument (the event) and should return a string
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40 to be added. This variable is local to every buffer.")
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41 (make-variable-buffer-local 'mode-motion-help-echo-string)
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42
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43 (defun mode-motion-ensure-extent-ok (event)
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44 (let ((buffer (event-buffer event)))
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45 (if (and (extent-live-p mode-motion-extent)
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46 (eq buffer (extent-object mode-motion-extent)))
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47 nil
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48 (setq mode-motion-extent (make-extent nil nil buffer))
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49 (set-extent-property mode-motion-extent 'mouse-face 'highlight))))
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50
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51 (defun mode-motion-highlight-internal (event backward forward)
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52 (let* ((buffer (event-buffer event))
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53 (point (and buffer (event-point event))))
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54 (if (and buffer
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55 (not (eq buffer mouse-grabbed-buffer)))
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56 ;; #### ack!! Too many calls to save-window-excursion /
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57 ;; save-excursion (x-track-pointer calls, so does
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58 ;; minibuf-mouse-tracker ...) This needs to be looked
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59 ;; into. It's complicated by the fact that sometimes
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60 ;; a mode-motion-hook might really want to change
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61 ;; the point.
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62 ;;
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63 ;; #### The save-excursion must come before the
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64 ;; save-window-excursion in order to function properly. I
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65 ;; haven't given this much thought. Is it a bug that this
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66 ;; ordering is necessary or is it correct behavior?
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67 (save-excursion
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68 (save-window-excursion
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69 (set-buffer buffer)
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70 (mode-motion-ensure-extent-ok event)
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71 (if point
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72 (progn
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73 (goto-char point)
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74 (condition-case nil (funcall backward) (error nil))
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75 (setq point (point))
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76 (condition-case nil (funcall forward) (error nil))
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77 (if (eq point (point))
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78 (detach-extent mode-motion-extent)
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79 (set-extent-endpoints mode-motion-extent point (point))))
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80 ;; not over text; zero the extent.
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81 (detach-extent mode-motion-extent)))))))
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82
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83 (defun mode-motion-highlight-line (event)
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84 "For use as the value of `mode-motion-hook' -- highlight line under mouse."
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85 (mode-motion-highlight-internal event 'beginning-of-line 'end-of-line))
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86
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87 (defun mode-motion-highlight-word (event)
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88 "For use as the value of `mode-motion-hook' -- highlight word under mouse."
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89 (mode-motion-highlight-internal
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90 event
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91 #'(lambda () (default-mouse-track-beginning-of-word nil))
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92 #'(lambda () (default-mouse-track-end-of-word nil))))
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93
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94 (defun mode-motion-highlight-symbol (event)
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95 "For use as the value of `mode-motion-hook' -- highlight symbol under mouse."
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96 (mode-motion-highlight-internal
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97 event
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98 #'(lambda () (default-mouse-track-beginning-of-word t))
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99 #'(lambda () (default-mouse-track-end-of-word t))))
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100
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101 (defun mode-motion-highlight-sexp (event)
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102 "For use as the value of `mode-motion-hook' -- highlight form under mouse."
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103 (mode-motion-highlight-internal
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104 event
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105 #'(lambda ()
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106 (if (= (char-syntax (following-char)) ?\()
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107 nil
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108 (goto-char (scan-sexps (point) -1))))
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109 #'(lambda ()
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110 (if (= (char-syntax (following-char)) ?\))
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111 (forward-char 1))
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112 (goto-char (scan-sexps (point) 1)))))
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113
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114 (defun mode-motion-add-help-echo (event)
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115 "For use as the value of `mode-motion-hook' -- add a 'help-echo property.
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116 This causes the string in the 'help-echo property to be displayed when the
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117 mouse moves over the extent. See `mode-motion-help-echo-string' for
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118 documentation on how to control the string that is added."
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119 (mode-motion-ensure-extent-ok event)
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120 (let ((string (cond ((null mode-motion-help-echo-string) nil)
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121 ((stringp mode-motion-help-echo-string)
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122 mode-motion-help-echo-string)
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123 (t (funcall mode-motion-help-echo-string event)))))
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124 (if (stringp string)
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125 (set-extent-property mode-motion-extent 'help-echo string))))
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126
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127
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128 (provide 'mode-motion)
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