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1 ;;; $Id: internal-drag-and-drop.el,v 1.1.1.1 1996/12/18 03:46:48 steve Exp $
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2 ;;;
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3 ;;; Copyright (C) 1996 Heiko Muenkel
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4 ;;; email: muenkel@tnt.uni-hannover.de
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5 ;;;
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6 ;;; This program is free software; you can redistribute it and/or modify
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7 ;;; it under the terms of the GNU General Public License as published by
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8 ;;; the Free Software Foundation; either version 1, or (at your option)
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9 ;;; any later version.
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10 ;;;
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11 ;;; This program is distributed in the hope that it will be useful,
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12 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 ;;; GNU 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 this program; if not, write to the Free Software
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18 ;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 ;;;
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20 ;;;
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21 ;;; Description:
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22 ;;;
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23 ;;; This package provides functions to define and call internal
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24 ;;; drag and drop actions in the emacs. One could start such an
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25 ;;; action by clicking with the mouse in the source buffer and
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26 ;;; then in the destination buffer. The action could depend on
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27 ;;; the points where youve clicked with the mouse, on the state
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28 ;;; of the region, the point, the mark and any other properties
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29 ;;; of the source and the destination buffers. The actions are
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30 ;;; defined by the variable `idd-actions', which is a buffer local
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31 ;;; variable. The following is an example for the html-mode:
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32 ;;; (defvar html-idd-actions
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33 ;;; '((nil (((idd-major-mode-p . dired-mode)
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34 ;;; (idd-dired-file-on-line-p . ".*\\.\\(gif\\)\\|\\(jpq\\)"))
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35 ;;; hm--html-idd-add-include-image-from-dired-line)
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36 ;;; (((idd-major-mode-p . dired-mode)
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37 ;;; (idd-dired-no-file-on-line-p . nil))
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38 ;;; hm--html-idd-add-file-link-to-file-on-dired-line)
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39 ;;; (((idd-major-mode-p . dired-mode)
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40 ;;; (idd-dired-no-file-on-line-p . t))
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41 ;;; hm--html-idd-add-file-link-to-directory-of-buffer)
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42 ;;; (((idd-major-mode-p . w3-mode)
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43 ;;; (idd-url-at-point-p . t))
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44 ;;; hm--html-idd-add-html-link-from-w3-buffer-point)
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45 ;;; (((idd-major-mode-p . w3-mode))
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46 ;;; hm--html-idd-add-html-link-to-w3-buffer)
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47 ;;; (((idd-local-file-p . t))
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48 ;;; hm--html-idd-add-file-link-to-buffer)))
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49 ;;; Look at the variable `idd-actions' for further descriptions.
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50 ;;;
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51 ;;;
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52 ;;;
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53 ;;; Installation:
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54 ;;;
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55 ;;; Put this file in one of your load path directories.
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56 ;;;
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57 ;;; Put the following in your .emacs:
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58 ;;; (autoload 'idd-mouse-drag-and-drop "internal-drag-and-drop"
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59 ;;; "Performs a drag and drop action.
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60 ;;; At first you must click on the source and
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61 ;;; after that on the destination."
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62 ;;; t)
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63 ;;; (define-key global-map [(meta button1)] 'idd-mouse-drag-and-drop)
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64 ;;;
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65 ;;; Define actions in the variable `idd-actions'.
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66 ;;;
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67
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68 (defvar idd-actions nil
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69 "The list with actions, depending on the source and the destination.
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70 The list looks like:
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71 '((<source-specification-1> (<destination-specification-1> <action-1-1>)
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72 (<destination-specification-2> <action-1-2>)
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73 :
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74 )
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75 (<source-specification-2> (<destination-specification-1> <action-2-1>)
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76 (<destination-specification-2> <action-2-2>)
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77 :
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78 )
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79 :
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80 )
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81 The <source-specification> looks like the following:
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82 '([(<specification-type> <value>)])
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83 with <specification-type> :== idd-minor-mode-p | idd-buffer-name-p
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84 | idd-region-active-p ...
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85
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86 The <destination-specification> looks like <source-specification>, except
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87 that a valid <specification-type> is also idd-major-mode-p.
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88
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89 If <source-specification-1> or <destination-specification-1> is set to
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90 nil, then every source or destination matches. `idd-actions' is a
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91 buffer local variable, which should be at least mode depended. So if
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92 the <source-specification-1> is set to nil it says, that the source
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93 buffer must only have a specific mode. But however, it's also possible
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94 to define a general `idd-actions' list, where the source mode is
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95 specified by idd-major-mode-p.
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96
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97 <action> ist a function, which has two arguments, the specifies the
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98 source and the second the destination.")
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99
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100 (make-variable-buffer-local 'idd-actions)
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101
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102 (defun idd-compare-a-specification (source-or-destination
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103 specification)
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104 "Tests if SOURCE-OR-DESTINATION matches the SPECIFICATION.
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105 It returns a value (1 in general) if both are matching or nil."
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106 (eval (list (car specification)
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107 'source-or-destination
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108 '(cdr specification))))
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109
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110 (defun idd-compare-specifications-1 (source-or-destination
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111 specifications
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112 value)
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113 "Internal function of `idd-compare-specifications'.
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114 VALUE is the value of the last matches."
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115 (cond ((not specifications) value)
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116 (t (let ((match (idd-compare-a-specification source-or-destination
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117 (car specifications))))
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118 (cond ((not match) 0)
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119 (t (idd-compare-specifications-1 source-or-destination
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120 (cdr specifications)
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121 (+ value match))))))))
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122
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123 (defun idd-compare-specifications (source-or-destination
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124 specifications)
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125 "Determines how good SOURCE-OR-DESTINATION and SPECIFICATIONS are matching.
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126 A return value of zero means, that they don't match. The higher the
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127 return value the better is the matching."
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128 (cond ((not specifications) 1)
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129 (t (idd-compare-specifications-1 source-or-destination
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130 specifications
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131 0))))
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132
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133 (defun idd-get-action-depending-on-destination (destination
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134 actions-depending-on-dest
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135 source-value
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136 value-action-pair)
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137 "Internal function of `idd-get-action-depending-on-source-and-destination'."
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138 (let ((destination-value (idd-compare-specifications
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139 destination
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140 (car (car actions-depending-on-dest)))))
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141 (cond ((not actions-depending-on-dest) value-action-pair)
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142 ((or (= destination-value 0)
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143 (<= (+ source-value destination-value) (car value-action-pair)))
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144 (idd-get-action-depending-on-destination
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145 destination
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146 (cdr actions-depending-on-dest)
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147 source-value
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148 value-action-pair))
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149 (t (idd-get-action-depending-on-destination
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150 destination
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151 (cdr actions-depending-on-dest)
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152 source-value
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153 (cons (+ source-value destination-value)
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154 (second (car actions-depending-on-dest))))))))
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155
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156 (defun idd-get-action-depending-on-source-and-destination (source
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157 destination
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158 actions
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159 value-action-pair)
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160 "Internal function of `idd-get-action'.
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161 VALUE-ACTION-PAIR is a list like (<value> <action>).
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162 It returns VALUE-ACTION-PAIR, if no other action is found, which has a
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163 value higher than (car VALUE-ACTION-PAIR)."
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164 (let ((source-value (idd-compare-specifications source (car (car actions)))))
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165 (cond ((not actions) value-action-pair)
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166 ((= source-value 0)
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167 (idd-get-action-depending-on-source-and-destination
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168 source
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169 destination
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170 (cdr actions)
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171 value-action-pair))
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172 (t (idd-get-action-depending-on-source-and-destination
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173 source
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174 destination
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175 (cdr actions)
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176 (idd-get-action-depending-on-destination
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177 destination
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178 (cdr (car actions))
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179 source-value
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180 value-action-pair))))))
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181
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182 (defun idd-get-action (source destination actions)
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183 "Returns the action, which depends on the SOURCE and the DESTINATION.
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184 The list ACTIONS contains all possible actions. Look at the variable
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185 `idd-actions' for a description of the format of this list."
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186 (idd-get-action-depending-on-source-and-destination source
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187 destination
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188 actions
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189 '(0 . nil)))
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190
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191 (defun idd-get-buffer-url (source-or-destination)
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192 "Returns the URL of the buffer specified by SOURCE-OR-DESTINATION."
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193 (save-excursion
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194 (idd-set-point source-or-destination)
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195 (url-view-url t)))
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196
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197 (defun idd-get-url-at-point (source-or-destination)
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198 "Returns the URL at the point specified by SOURCE-OR-DESTINATION.
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199 It returns nil, if there is no URL."
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200 (save-excursion
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201 (idd-set-point source-or-destination)
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202 (w3-view-this-url t)))
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203
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204 (defun idd-url-at-point-p (source-or-destination value)
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205 "Checks if there is an URL at the point of SOURCE-OR-DESTINATION.
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206 If that is t and VALUE is t, or that is nil and VALUE is nil, then 1
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207 is returned. Otherwise nil is returned."
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208 (if value
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209 (if (idd-get-url-at-point source-or-destination)
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210 1
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211 nil)
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212 (if (idd-get-url-at-point source-or-destination)
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213 nil
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214 1)))
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215
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216 (defun idd-major-mode-p (source-or-destination mode)
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217 "Checks, if the major mode of SOURCE-OR-DESTINATION is MODE.
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218 It returns 1, if that is t and nil otherwise."
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219 (save-excursion
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220 (set-buffer (cdr (assoc ':buffer source-or-destination)))
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221 (if (eq major-mode mode)
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222 1
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223 nil)))
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224
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225 (defun idd-set-point (source-or-destination)
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226 "Sets the point and buffer to SOURCE-OR-DESTINATION."
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227 (set-buffer (cdr (assoc ':buffer source-or-destination)))
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228 (goto-char (cdr (assoc ':drag-or-drop-point source-or-destination))))
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229
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230 (defun idd-set-region (source-or-destination)
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231 "Sets the point, mark and buffer to SOURCE-OR-DESTINATION.
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232 The region is active after this function is called."
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233 (set-buffer (cdr (assoc ':buffer source-or-destination)))
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234 (goto-char (car (cdr (assoc ':region-active source-or-destination))))
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235 (set-mark (cdr (cdr (assoc ':region-active source-or-destination))))
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236 (activate-region))
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237
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238 (defun idd-get-dired-filename-from-line (source-or-destination)
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239 "Returns the filename form the line in a dired buffer.
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240 The position and the buffer is specified by SOURCE-OR-DESTINATION."
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241 (save-excursion
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242 (idd-set-point source-or-destination)
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243 (dired-get-filename nil t)))
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244
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245 (defun idd-dired-file-on-line-p (source-or-destination filename-regexp)
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246 "Checks, if the filename on the line match FILENAME-REGEXP.
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247 The function `dired-get-filename' is used, to get the filename from
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248 the SOURCE-OR-DESTINATION. It returns 1, if it matchs or nil."
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249 (let ((case-fold-search t))
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250 (if (and (idd-get-dired-filename-from-line source-or-destination)
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251 (string-match filename-regexp
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252 (idd-get-dired-filename-from-line
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253 source-or-destination)))
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254 1
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255 nil)))
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256
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257 (defun idd-dired-no-file-on-line-p (source-or-destination value)
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258 "Checks, if a filename is in the dired buffer of SOURCE-OR-DESTINATION.
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259 It returns 1, if a filename is on the line and if VALUE is t, or if
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260 no filename is on the line and VALUE is nil, otherwise it returns
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261 nil. For the test the function `dired-get-filename' is used."
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262 (if (idd-get-dired-filename-from-line source-or-destination)
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263 (if value nil 1)
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264 (if value 1 nil)))
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265
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266 (autoload 'ange-ftp-ftp-path "ange-ftp"
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267 "Parse PATH according to ange-ftp-path-format (which see).
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268 Returns a list (HOST USER PATH), or nil if PATH does not match the format.")
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269
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270 (defun idd-get-local-filename (source-or-destination)
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271 "Returns the filename of a local file specified by SOURCE-OR-DESTINATION."
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272 (buffer-file-name (cdr (assoc ':buffer source-or-destination))))
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273
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274 (defun idd-get-directory-of-buffer (source-or-destination)
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275 "Returns the directory name assigned to the SOURCE-OR-DESTINATION buffer."
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276 (save-excursion
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277 (idd-set-point source-or-destination)
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278 default-directory))
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279
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280 (defun idd-local-file-p (source-or-destination value)
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281 "Checks, if SOURCE-OR-DESTINATION has a file on the local filesystem.
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282 If that is t and VALUE is t, or that is nil and VALUE is nil, then 1
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283 is returned. Otherwise nil is returned."
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284 (let ((filename (idd-get-local-filename source-or-destination)))
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285 (if (and filename
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286 (not (ange-ftp-ftp-path filename)))
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287 (if value 1 nil)
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288 (if value nil 1))))
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289
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290 (defun idd-call-action (action source destination)
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291 "Calls the drag and drop ACTION with its arguments SOURCE and DESTINATION."
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292 (if (> (car action) 0)
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293 (if (symbol-function (cdr action))
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294 (eval (list (cdr action) 'source 'destination))
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295 (error "Error: Action %s isn't a valid function!" (cdr action)))
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296 (message "No valid action defined for this source and this destination!")))
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297
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298 (defun idd-mouse-drag-and-drop (source-event)
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299 "Performs a drag and drop action.
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300 At first you must click on the source and after that on the destination."
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301 (interactive "@e")
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302 (let ((source (list (cons ':buffer (current-buffer))
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303 (cons ':drag-or-drop-point
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304 (event-closest-point source-event))
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305 (cons ':region-active (if (region-active-p)
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306 (cons (point)
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307 (mark))))))
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308 (destination nil)
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309 (destination-event))
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310 (if (adapt-xemacsp)
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311 (dispatch-event (next-command-event)))
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312 (setq destination-event
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313 (next-command-event nil "Drag&Drop: Click on the destination!"))
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314 (cond ((button-press-event-p destination-event)
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315 (setq destination (list (cons ':buffer
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316 (event-buffer destination-event))
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317 (cons ':drag-or-drop-point
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318 (event-closest-point
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319 destination-event))
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320 (cons ':region-active nil)))
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321 (if (adapt-emacs19p)
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322 (while (not (button-release-event-p (next-command-event)))))
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323 (idd-call-action (idd-get-action source destination idd-actions)
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324 source
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325 destination))
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326 (t (setq action "Wrong event") nil))))
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327
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328
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329 (provide 'internal-drag-and-drop)
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