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1 ;;; dragdrop.el --- window system-independent Drag'n'Drop support.
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2
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3 ;; Copyright (C) 1998 Oliver Graf <ograf@fga.de>
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4
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5 ;; Maintainer: XEmacs Development Team, Oliver Graf <ograf@fga.de>
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6 ;; Keywords: drag, drop, dumped
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Synched up with: Not in FSF.
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26
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27 ;;; Commentary:
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28
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29 ;; This file is dumped with XEmacs (when window system support is compiled in).
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30
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31 ;;; Code:
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32
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33 (provide 'dragdrop)
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34
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35 ;; we need mouse-set-point
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36 (require 'mouse)
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37
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38 ;; I think this is a better name for the custom group
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39 ;; looks better in the menu and the group display as dragdrop
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40 (defgroup drag-n-drop nil
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41 "Window system-independent drag'n'drop support."
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42 :group 'editing)
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43
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44 (defcustom dragdrop-drop-at-point nil
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45 "*If non-nil, the drop handler functions will drop text at the cursor location.
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46 Otherwise, the cursor will be moved to the location of the pointer drop before
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47 text is inserted."
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48 :type 'boolean
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49 :group 'drag-n-drop)
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50
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51 (defcustom dragdrop-autoload-tm-view nil
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52 "*If non-nil, autoload tm-view if a MIME buffer needs to be decoded.
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53 Otherwise, the buffer is only decoded if tm-view is already avaiable."
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54 :type 'boolean
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55 :group 'drag-n-drop)
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56
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57 (defcustom dragdrop-drop-functions '(dragdrop-drop-url-default
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58 dragdrop-drop-mime-default)
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59 "This is the standart drop function search list.
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60 Each variable in this list is called with the drop data until
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61 one of the functions return t, or the end of the list is reached."
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62 :group 'drag-n-drop
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63 :type '(repeat (choice (function-item dragdrop-drop-url-default)
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64 (function-item dragdrop-drop-mime-default)
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65 (function :tag "other"))))
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66
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67 (defun dragdrop-drop-dispatch (object)
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68 "This function identifies DROP type misc-user-events.
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69 It tries to find out how to handle the dropped data by looking
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70 for dragdrop-drop-functions in extents and variables."
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71 (catch 'dragdrop-drop-is-done
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72 (and (event-over-text-area-p current-mouse-event)
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73 ;; let's search the extents
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74 (catch 'dragdrop-extents-done
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75 (let ((window (event-window current-mouse-event))
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76 (pos (event-point current-mouse-event))
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77 (cpos (event-closest-point current-mouse-event))
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78 (buffer nil))
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79 (or window (throw 'dragdrop-extents-done nil))
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80 (or pos (setq pos cpos))
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81 (select-window window)
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82 (setq buffer (window-buffer))
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83 (let ((ext (extent-at pos buffer 'dragdrop-drop-functions)))
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84 (while (not (eq ext nil))
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85 (dragdrop-drop-do-functions
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86 (extent-property ext 'dragdrop-drop-functions)
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87 object)
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88 (setq ext (extent-at pos buffer 'dragdrop-drop-functions ext)))))))
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89 ;; now look into the variable dragdrop-drop-functions
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90 (dragdrop-drop-do-functions dragdrop-drop-functions object)))
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91
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92 (defun dragdrop-drop-do-functions (drop-funs object)
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93 "Calls all functions in drop-funs with object until one returns t.
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94 Returns t if one of drop-funs returns t. Otherwise returns nil."
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95 (while (not (eq drop-funs ()))
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96 (and (funcall (car drop-funs) object)
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97 (throw 'dragdrop-drop-is-done t))
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98 (setq drop-funs (cdr drop-funs)))
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99 nil)
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100
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101 (defun dragdrop-drop-url-default (object)
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102 "Default handler for dropped URL data.
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103 Finds files and URLs. Returns nil if object does not contain URL data."
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104 (cond ((eq (car object) 'dragdrop-URL)
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105 (let ((data (cdr object))
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106 (frame (event-channel current-mouse-event))
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107 (x pop-up-windows))
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108 (setq pop-up-windows nil)
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109 (while (not (eq data ()))
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110 (cond ((dragdrop-is-some-url "file" (car data))
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111 ;; if it is some file, pop it to a buffer
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112 (pop-to-buffer (find-file-noselect
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113 (substring (car data) 5))
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114 nil frame))
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115 ;; to-do: open ftp URLs with efs...
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116 (t
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117 ;; some other URL, try to fire up some browser for it
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118 (if (boundp 'browse-url-browser-function)
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119 (funcall browse-url-browser-function (car data))
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120 (display-message 'error
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121 "Can't show URL, no browser selected"))))
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122 (undo-boundary)
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123 (setq data (cdr data)))
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124 (make-frame-visible frame)
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125 (setq pop-up-windows x)
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126 t))
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127 (t nil)))
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128
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129 (defun dragdrop-drop-mime-default (object)
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130 "Default handler for dropped MIME data.
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131 Inserts text into buffer, creates MIME buffers for other types.
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132 Returns nil if object does not contain MIME data."
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133 (cond ((eq (car object) 'dragdrop-MIME)
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134 (let ((ldata (cdr object))
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135 (frame (event-channel current-mouse-event))
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136 (x pop-up-windows)
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137 (data nil))
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138 ;; how should this be handled???
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139 ;; insert drops of text/* into buffer
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140 ;; create new buffer if pointer is outside buffer...
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141 ;; but there are many other ways...
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142 ;;
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143 ;; first thing: check if it's only text/plain and if the
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144 ;; drop happened inside some buffer. if yes insert it into
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145 ;; this buffer (hope it is not encoded in some MIME way)
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146 ;;
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147 ;; Remember: ("text/plain" "dosnotmatter" "somedata")
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148 ;; drops are inserted at mouse-point, if inside a buffer
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149 (while (not (eq ldata ()))
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150 (setq data (car ldata))
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151 (if (and (listp data)
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152 (= (length data) 3)
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153 (string= (car data) "text/plain")
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154 (event-over-text-area-p current-mouse-event))
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155 (let ((window (event-window current-mouse-event)))
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156 (and window
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157 (select-window window))
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158 (and (not dragdrop-drop-at-point)
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159 (mouse-set-point current-mouse-event))
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160 (insert (caddr data)))
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161 (let ((buf (get-buffer-create "*MIME-Drop data*")))
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162 (set-buffer buf)
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163 (pop-to-buffer buf nil frame)
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164 (or (featurep 'tm-view)
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165 (and dragdrop-autoload-tm-view
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166 (require 'tm-view)))
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167 (cond ((stringp data)
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168 ;; this is some raw MIME stuff
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169 ;; create some buffer and let tm do the job
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170 ;;
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171 ;; this is always the same buffer!!!
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172 ;; change?
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173 (erase-buffer)
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174 (insert data)
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175 (and (featurep 'tm-view)
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176 (mime/viewer-mode buf)))
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177 ((and (listp data)
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178 (= (length data) 3))
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179 ;; change the internal content-type representation to the
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180 ;; way tm does it ("content/type" (key . value)*)
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181 ;; but for now list will do the job
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182 ;;
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183 ;; this is always the same buffer!!!
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184 ;; change?
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185 (erase-buffer)
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186 (insert (caddr data))
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187 (and (featurep 'tm-view)
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188 ;; this list of (car data) should be done before
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189 ;; enqueing the event
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190 (mime/viewer-mode buf (list (car data)) (cadr data))))
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191 (t
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192 (display-message 'error "Wrong drop data")))))
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193 (undo-boundary)
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194 (setq ldata (cdr ldata)))
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195 (make-frame-visible frame)
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196 (setq pop-up-windows x))
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197 t)
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198 (t nil)))
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199
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200 (defun dragdrop-is-some-url (method url)
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201 "Returns true if method equals the start of url.
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202 If method does not end into ':' this is appended before the
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203 compare."
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204 (cond ((and (stringp url)
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205 (stringp method)
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206 (> (length url) (length method)))
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207 ;; is this ?: check efficient enough?
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208 (if (not (string= (substring method -1) ":"))
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209 (setq method (concat method ":")))
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210 (string= method (substring url 0 (length method))))
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211 (t nil)))
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212
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213 ;;; dragdrop.el ends here
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