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428
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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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442
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6 ;; Keywords: mouse, gui, dumped
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428
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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 drag'n'drop 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 ;; we need mouse-set-point
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34 (require 'mouse)
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35 (provide 'dragdrop)
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36
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37 ;; I think this is a better name for the custom group
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38 ;; looks better in the menu and the group display as dragdrop
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39 ;; Anyway: is dragdrop- a good prefix for all this?
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40 ;; What if someone trys drop<TAB> in the minibuffer?
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41 (defgroup drag-n-drop nil
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42 "*{EXPERIMENTAL} Window system-independent drag'n'drop support."
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43 :group 'editing)
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44
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45 (defcustom dragdrop-drop-at-point nil
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46 "*{EXPERIMENTAL} If non-nil, drop text at the cursor location.
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47 Otherwise, the cursor will be moved to the location of the pointer drop before
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48 text is inserted."
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49 :type 'boolean
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50 :group 'drag-n-drop)
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51
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52 (defcustom dragdrop-autoload-tm-view nil
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53 "*{EXPERIMENTAL} If non-nil, autoload tm-view to decode MIME data.
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54 Otherwise, the buffer is only decoded if tm-view is already available."
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55 :type 'boolean
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56 :group 'drag-n-drop)
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57
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58 ;; the widget for editing the drop-functions
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59 (define-widget 'dragdrop-function-widget 'list
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60 "*{EXPERIMENTAL} Widget for editing drop dispatch functions."
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61 :args `((choice :tag "Function"
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62 (function-item experimental-dragdrop-drop-url-default)
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63 (function-item experimental-dragdrop-drop-mime-default)
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64 (function-item experimental-dragdrop-drop-log-function)
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65 (function :tag "Other" nil))
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66 (choice :tag "Button" :value t
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67 (choice-item :tag "Ignore" t)
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68 (choice-item 0) (choice-item 1) (choice-item 2)
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69 (choice-item 3) (choice-item 4) (choice-item 5)
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70 (choice-item 6) (choice-item 7))
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71 (radio-button-choice :tag "Modifiers"
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72 (const :tag "Ignore Modifier Keys" t)
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73 (checklist :greedy t
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74 :format "Modifier Keys:\n%v"
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75 :extra-offset 6
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76 (const shift)
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77 (const control)
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78 (const meta)
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79 (const alt)
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80 (const hyper)
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81 (const super)))
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82 (repeat :inline t :value nil :tag "Extra Function Arguments"
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83 (sexp :tag "Arg" :value nil)))
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84 :value '(nil t t))
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85
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86 (defcustom experimental-dragdrop-drop-functions '((experimental-dragdrop-drop-url-default t t)
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87 (experimental-dragdrop-drop-mime-default t t))
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88 "*{EXPERIMENTAL} This is the standart drop function search list.
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89 Each element is a list of a function, a button selector, a modifier
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90 selector and optional argumets to the function call.
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91 The function must accept at least two arguments: first is the event
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92 of the drop, second the object data, followed by any of the optional
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93 arguments provided in this list.
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94 The functions are called in order, until one returns t."
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95 :group 'drag-n-drop
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96 :type '(repeat dragdrop-function-widget))
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97
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98 (defgroup dnd-debug nil
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99 "*{EXPERIMENTAL} Drag'n'Drop debugging options."
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100 :group 'drag-n-drop)
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101
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102 (defcustom dragdrop-drop-log nil
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103 "*{EXPERIMENTAL} If non-nil, every drop is logged.
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104 The name of the buffer is set in the custom 'dragdrop-drop-log-name"
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105 :group 'dnd-debug
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106 :type 'boolean)
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107
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108 (defcustom dragdrop-drop-log-name "*drop log buffer*"
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109 "*{EXPERIMENTAL} The name of the buffer used to log drops.
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110 Set dragdrop-drop-log to non-nil to enable this feature."
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111 :group 'dnd-debug
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112 :type 'string)
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113
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114 (defvar dragdrop-drop-log-buffer nil
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115 "*{EXPERIMENTAL} Buffer to log drops in debug mode.")
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116
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117 ;;
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118 ;; Drop API
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119 ;;
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120 (defun dragdrop-drop-dispatch (object)
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121 "*{EXPERIMENTAL} This function identifies DROP type misc-user-events.
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122 It calls functions which will handle the drag."
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123 (let ((event current-mouse-event))
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124 (and dragdrop-drop-log
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125 (experimental-dragdrop-drop-log-function event object))
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126 (dragdrop-drop-find-functions event object)))
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127
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128 (defun dragdrop-drop-find-functions (event object)
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129 "Finds valid drop-handle functions and executes them to dispose the drop.
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130 It does this by looking for extent-properties called
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131 'experimental-dragdrop-drop-functions and for variables named like this."
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132 (catch 'dragdrop-drop-is-done
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133 (and (event-over-text-area-p event)
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134 ;; let's search the extents
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135 (catch 'dragdrop-extents-done
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136 (let ((window (event-window event))
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137 (pos (event-point event))
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138 (cpos (event-closest-point event))
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139 (buffer nil))
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140 (or window (throw 'dragdrop-extents-done nil))
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141 (or pos (setq pos cpos))
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142 (select-window window)
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143 (setq buffer (window-buffer))
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144 (let ((ext (extent-at pos buffer 'experimental-dragdrop-drop-functions)))
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145 (while (not (eq ext nil))
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146 (dragdrop-drop-do-functions
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147 (extent-property ext 'experimental-dragdrop-drop-functions)
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148 event
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149 object)
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150 (setq ext (extent-at pos buffer
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151 'experimental-dragdrop-drop-functions
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152 ext)))))))
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153 ;; now look into the variable experimental-dragdrop-drop-functions
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154 (dragdrop-drop-do-functions experimental-dragdrop-drop-functions event object)))
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155
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156 (defun dragdrop-compare-mods (first-mods second-mods)
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157 "Returns t if both first-mods and second-mods contain the same elements.
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158 Order is not important."
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159 (let ((moda (copy-sequence first-mods))
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160 (modb (copy-sequence second-mods)))
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161 (while (and (not (eq moda ()))
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162 (not (eq modb ())))
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163 (setq modb (delete (car moda) modb))
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164 (setq moda (delete (car moda) moda)))
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165 (and (eq moda ())
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166 (eq modb ()))))
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167
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168 (defun dragdrop-drop-do-functions (drop-funs event object)
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169 "Calls all functions in drop-funs with object until one returns t.
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170 Returns t if one of drop-funs returns t. Otherwise returns nil."
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171 (let ((flist nil)
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172 (button (event-button event))
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173 (mods (event-modifiers event)))
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174 (while (not (eq drop-funs ()))
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175 (setq flist (car drop-funs))
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176 (and (or (eq (cadr flist) t)
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177 (= (cadr flist) button))
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178 (or (eq (caddr flist) t)
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179 (dragdrop-compare-mods (caddr flist) mods))
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180 (apply (car flist) `(,event ,object ,@(cdddr flist)))
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181 ;; (funcall (car flist) event object)
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182 (throw 'dragdrop-drop-is-done t))
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183 (setq drop-funs (cdr drop-funs))))
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184 nil)
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185
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186 (defun experimental-dragdrop-drop-log-function (event object &optional message buffer)
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187 "*{EXPERIMENTAL} Logs any drops into a buffer.
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188 If buffer is nil, it inserts the data into a buffer called after
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189 dragdrop-drop-log-name.
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190 If dragdrop-drop-log is non-nil, this is done automatically for each drop.
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191 The function always returns nil."
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192 (save-excursion
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193 (cond ((buffer-live-p buffer)
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194 (set-buffer buffer))
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195 ((stringp buffer)
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196 (set-buffer (get-buffer-create buffer)))
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197 ((buffer-live-p dragdrop-drop-log-buffer)
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198 (set-buffer dragdrop-drop-log-buffer))
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199 (t
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200 (setq dragdrop-drop-log-buffer (get-buffer-create dragdrop-drop-log-name))
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201 (set-buffer dragdrop-drop-log-buffer)))
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202 (insert (format "* %s: %s\n"
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203 (current-time-string)
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204 (if message message "received a drop")))
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205 (insert (format " at %d,%d (%d,%d) with button %d and mods %s\n"
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206 (event-x event)
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207 (event-y event)
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208 (event-x-pixel event)
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209 (event-y-pixel event)
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210 (event-button event)
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211 (event-modifiers event)))
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212 (insert (format " data is of type %s (%d %s)\n"
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213 (cond ((eq (car object) 'dragdrop-URL) "URL")
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214 ((eq (car object) 'dragdrop-MIME) "MIME")
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215 (t "UNKNOWN"))
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216 (length (cdr object))
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217 (if (= (length (cdr object)) 1) "element" "elements")))
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218 (let ((i 1)
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219 (data (cdr object)))
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220 (while (not (eq data ()))
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221 (insert (format " Element %d: %S\n"
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222 i (car data)))
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223 (setq i (1+ i))
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224 (setq data (cdr data))))
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225 (insert "----------\n"))
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226 nil)
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227
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228 (defun experimental-dragdrop-drop-url-default (event object)
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229 "*{EXPERIMENTAL} Default handler for dropped URL data.
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230 Finds files and URLs. Returns nil if object does not contain URL data."
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231 (cond ((eq (car object) 'dragdrop-URL)
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232 (let ((data (cdr object))
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233 (frame (event-channel event))
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234 (x pop-up-windows)
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235 (window (event-window event)))
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236 (setq pop-up-windows nil)
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237 (while (not (eq data ()))
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238 (cond ((dragdrop-is-some-url "file" (car data))
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239 ;; if it is some file, pop it to a buffer
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240 (cond (window
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241 (select-window window)))
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242 (switch-to-buffer (find-file-noselect
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243 (substring (car data) 5))))
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244 ;; to-do: open ftp URLs with efs...
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245 (t
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246 ;; some other URL, try to fire up some browser for it
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442
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247 (if (fboundp 'browse-url)
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248 (browse-url (car data))
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428
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249 (display-message 'error
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250 "Can't show URL, no browser selected"))))
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251 (undo-boundary)
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252 (setq data (cdr data)))
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253 (make-frame-visible frame)
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254 (setq pop-up-windows x)
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255 t))
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256 (t nil)))
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257
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258 (defun experimental-dragdrop-drop-mime-default (event object)
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259 "*{EXPERIMENTAL} Default handler for dropped MIME data.
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260 Inserts text into buffer, creates MIME buffers for other types.
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261 Returns nil if object does not contain MIME data."
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262 (cond ((eq (car object) 'dragdrop-MIME)
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263 (let ((ldata (cdr object))
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264 (frame (event-channel event))
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265 (x pop-up-windows)
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266 (data nil))
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267 ;; how should this be handled???
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268 ;; insert drops of text/* into buffer
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269 ;; create new buffer if pointer is outside buffer...
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270 ;; but there are many other ways...
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271 ;;
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272 ;; first thing: check if it's only text/plain and if the
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273 ;; drop happened inside some buffer. if yes insert it into
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274 ;; this buffer (hope it is not encoded in some MIME way)
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275 ;;
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276 ;; Remember: ("text/plain" "dosnotmatter" "somedata")
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277 ;; drops are inserted at mouse-point, if inside a buffer
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278 (while (not (eq ldata ()))
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279 (setq data (car ldata))
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280 (if (and (listp data)
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281 (= (length data) 3)
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282 (listp (car data))
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283 (stringp (caar data))
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284 (string= (caar data) "text/plain")
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285 (event-over-text-area-p event))
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286 (let ((window (event-window event)))
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287 (and window
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288 (select-window window))
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289 (and (not dragdrop-drop-at-point)
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290 (mouse-set-point event))
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291 (insert (caddr data)))
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292 (let ((buf (get-buffer-create "*MIME-Drop data*")))
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293 (set-buffer buf)
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294 (pop-to-buffer buf nil frame)
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295 (or (featurep 'tm-view)
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296 (and dragdrop-autoload-tm-view
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297 (require 'tm-view)))
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298 (cond ((stringp data)
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299 ;; this is some raw MIME stuff
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300 ;; create some buffer and let tm do the job
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301 ;;
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302 ;; this is always the same buffer!!!
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303 ;; change?
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304 (erase-buffer)
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305 (insert data)
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306 (and (featurep 'tm-view)
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307 (mime/viewer-mode buf)))
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308 ((and (listp data)
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309 (= (length data) 3))
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310 ;; change the internal content-type representation to the
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311 ;; way tm does it ("content/type" (key . value)*)
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312 ;; but for now list will do the job
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313 ;;
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314 ;; this is always the same buffer!!!
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315 ;; change?
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316 (erase-buffer)
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317 (insert (caddr data))
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318 (and (featurep 'tm-view)
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319 ;; this list of (car data) should be done before
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320 ;; enqueing the event
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321 (mime/viewer-mode buf (car data) (cadr data))))
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322 (t
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323 (display-message 'error "Wrong drop data")))))
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324 (undo-boundary)
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325 (setq ldata (cdr ldata)))
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326 (make-frame-visible frame)
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327 (setq pop-up-windows x))
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328 t)
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329 (t nil)))
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330
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331 (defun dragdrop-is-some-url (method url)
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332 "Returns true if method equals the start of url.
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333 If method does not end into ':' this is appended before the
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334 compare."
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335 (cond ((and (stringp url)
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336 (stringp method)
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337 (> (length url) (length method)))
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338 ;; is this ?: check efficient enough?
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339 (if (not (string= (substring method -1) ":"))
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340 (setq method (concat method ":")))
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341 (string= method (substring url 0 (length method))))
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342 (t nil)))
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343
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344 ;;
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345 ;; Drag API
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346 ;;
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347 (defun experimental-dragdrop-drag (event object)
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348 "*{EXPERIMENTAL} The generic drag function.
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349 Tries to do the best with object in the selected protocol.
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350 Object must comply to the standart drag'n'drop object
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351 format."
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352 (error "Not implemented"))
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353
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354 (defun experimental-dragdrop-drag-region (event begin end)
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355 "*{EXPERIMENTAL} Drag a region.
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356 This function uses special data types if the low-level
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357 protocol requires it. It does so by calling
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358 dragdrop-drag-pure-text."
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359 (experimental-dragdrop-drag-pure-text event
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360 (buffer-substring-no-properties begin end)))
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361
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362 (defun experimental-dragdrop-drag-pure-text (event text)
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363 "*{EXPERIMENTAL} Drag text-only data.
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364 Takes care of special low-level protocol data types.
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365 Text must be a list of strings."
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366 (error "Not implemented"))
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367
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368 (defun experimental-dragdrop-drag-pure-file (event file)
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369 "*{EXPERIMENTAL} Drag filepath-only data.
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370 Takes care of special low-level protocol data types.
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371 file must be a list of strings."
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372 (error "Not implemented"))
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373
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374 ;;
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375 ;; The following ones come from frame.el but the better belong here
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376 ;; until changed
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377 ;;
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378 (defun cde-start-drag (event type data)
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379 "Implement the CDE drag operation.
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380 Calls the internal function cde-start-drag-internal to do the actual work."
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381 (interactive "_eXX")
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382 (if (featurep 'cde)
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383 ;; Avoid build-time doc string warning by calling the function
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384 ;; in the following roundabout way:
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385 (funcall (intern "cde-start-drag-internal")
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386 event type data)
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387 (error "CDE functionality not compiled in.")))
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388
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389 (defun cde-start-drag-region (event begin end)
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390 "Implement the CDE drag operation for a region.
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391 Calls the internal function CDE-start-drag-internal to do the actual work.
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392 This always does buffer transfers."
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393 ;; Oliver Graf <ograf@fga.de>
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394 (interactive "_er")
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395 (if (featurep 'cde)
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396 (funcall (intern "cde-start-drag-internal")
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397 event nil (list (buffer-substring-no-properties begin end)))
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398 (error "CDE functionality not compiled in.")))
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399
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400 ;; the OffiX drag stuff will soon move also (perhaps mouse.el)
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401 ;; if the drag event is done
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402 (defun offix-start-drag (event data &optional type)
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403 "Implement the OffiX drag operation.
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404 Calls the internal function offix-start-drag-internal to do the actual work.
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405 If type is not given, DndText is assumed."
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406 ;; Oliver Graf <ograf@fga.de>
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407 (interactive "esi")
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408 (if (featurep 'offix)
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409 (funcall (intern "offix-start-drag-internal") event data type)
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410 (error "OffiX functionality not compiled in.")))
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411
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412 (defun offix-start-drag-region (event begin end)
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413 "Implement the OffiX drag operation for a region.
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414 Calls the internal function offix-start-drag-internal to do the actual work.
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415 This always assumes DndText as type."
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416 ;; Oliver Graf <ograf@fga.de>
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417 (interactive "_er")
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418 (if (featurep 'offix)
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419 (funcall (intern "offix-start-drag-internal")
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420 event (buffer-substring-no-properties begin end))
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421 (error "OffiX functionality not compiled in.")))
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422
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462
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423 (defun gtk-start-drag (event data &optional type)
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424 (interactive "esi")
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425 (if (featurep 'gtk)
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426 (gtk-start-drag-internal event data type)
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427 (error "GTK functionality not compiled in.")))
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428
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429 (defun gtk-start-drag-region (event begin end)
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430 (interactive "_er")
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431 (if (featurep 'gtk)
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432 (gtk-start-drag-internal event (buffer-substring-no-properties begin end) "text/plain")
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433 (error "GTK functionality not compiled in.")))
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428
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434
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435 ;;; dragdrop.el ends here
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