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1 \input texinfo.tex
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2
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3 @c %**start of header
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4 @setfilename widget
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5 @settitle The Emacs Widget Library
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6 @iftex
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7 @afourpaper
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8 @headings double
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9 @end iftex
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10 @c %**end of header
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11
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12 @node Top, Introduction, (dir), (dir)
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13 @comment node-name, next, previous, up
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14 @top The Emacs Widget Library
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15
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149
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16 Version: 1.97
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17
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18 @menu
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19 * Introduction::
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20 * User Interface::
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21 * Programming Example::
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22 * Setting Up the Buffer::
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23 * Basic Types::
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24 * Sexp Types::
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25 * Widget Properties::
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26 * Defining New Widgets::
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149
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27 * Widget Browser::
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28 * Widget Minor Mode::
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29 * Utilities::
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30 * Widget Wishlist::
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98
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31 @end menu
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32
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33 @node Introduction, User Interface, Top, Top
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34 @comment node-name, next, previous, up
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35 @section Introduction
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36
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37 Most graphical user interface toolkits, such as Motif and XView, provide
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38 a number of standard user interface controls (sometimes known as
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39 `widgets' or `gadgets'). Emacs doesn't really support anything like
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40 this, except for an incredible powerful text ``widget''. On the other
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41 hand, Emacs does provide the necessary primitives to implement many
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42 other widgets within a text buffer. The @code{widget} package
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43 simplifies this task.
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44
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45 The basic widgets are:
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46
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47 @table @code
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48 @item link
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49 Areas of text with an associated action. Intended for hypertext links
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50 embedded in text.
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51 @item push-button
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52 Like link, but intended for stand-alone buttons.
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53 @item editable-field
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54 An editable text field. It can be either variable or fixed length.
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55 @item menu-choice
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56 Allows the user to choose one of multiple options from a menu, each
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57 option is itself a widget. Only the selected option will be visible in
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58 the buffer.
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59 @item radio-button-choice
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60 Allows the user to choose one of multiple options by pushing radio
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61 buttons. The options are implemented as widgets. All options will be
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62 visible in the buffer.
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63 @item item
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64 A simple constant widget intended to be used in the @code{menu-choice} and
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65 @code{radio-button-choice} widgets.
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66 @item choice-item
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67 An button item only intended for use in choices. When pushed, the user
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68 will be asked to select another option from the choice widget.
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69 @item toggle
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70 A simple @samp{on}/@samp{off} switch.
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71 @item checkbox
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72 A checkbox (@samp{[ ]}/@samp{[X]}).
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73 @item editable-list
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74 Create an editable list. The user can insert or delete items in the
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75 list. Each list item is itself a widget.
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76 @end table
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77
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78 Now of what possible use can support for widgets be in a text editor?
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79 I'm glad you asked. The answer is that widgets are useful for
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80 implementing forms. A @dfn{form} in emacs is a buffer where the user is
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81 supposed to fill out a number of fields, each of which has a specific
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82 meaning. The user is not supposed to change or delete any of the text
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83 between the fields. Examples of forms in Emacs are the @file{forms}
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84 package (of course), the customize buffers, the mail and news compose
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85 modes, and the @sc{html} form support in the @file{w3} browser.
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86
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87 The advantages for a programmer of using the @code{widget} package to
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88 implement forms are:
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89
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90 @enumerate
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91 @item
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92 More complex field than just editable text are supported.
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93 @item
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94 You can give the user immediate feedback if he enters invalid data in a
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95 text field, and sometimes prevent entering invalid data.
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96 @item
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97 You can have fixed sized fields, thus allowing multiple field to be
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98 lined up in columns.
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99 @item
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100 It is simple to query or set the value of a field.
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101 @item
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102 Editing happens in buffer, not in the mini-buffer.
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103 @item
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104 Packages using the library get a uniform look, making them easier for
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105 the user to learn.
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106 @item
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107 As support for embedded graphics improve, the widget library will
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108 extended to support it. This means that your code using the widget
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109 library will also use the new graphic features by automatic.
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110 @end enumerate
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111
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112 In order to minimize the code that is loaded by users who does not
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113 create any widgets, the code has been split in two files:
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114
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115 @table @file
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116 @item widget.el
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117 This will declare the user variables, define the function
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118 @code{widget-define}, and autoload the function @code{widget-create}.
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106
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119 @item wid-edit.el
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120 Everything else is here, there is no reason to load it explicitly, as
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121 it will be autoloaded when needed.
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122 @end table
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123
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124 @node User Interface, Programming Example, Introduction, Top
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125 @comment node-name, next, previous, up
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126 @section User Interface
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127
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128 A form consist of read only text for documentation and some fields,
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129 where each the fields contain two parts, as tag and a value. The tags
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130 are used to identify the fields, so the documentation can refer to the
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131 foo field, meaning the field tagged with @samp{Foo}. Here is an example
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132 form:
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133
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134 @example
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135 Here is some documentation.
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136
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137 Name: @i{My Name} @strong{Choose}: This option
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138 Address: @i{Some Place
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139 In some City
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140 Some country.}
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141
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142 See also @b{_other work_} for more information.
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143
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144 Numbers: count to three below
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145 @b{[INS]} @b{[DEL]} @i{One}
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146 @b{[INS]} @b{[DEL]} @i{Eh, two?}
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147 @b{[INS]} @b{[DEL]} @i{Five!}
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148 @b{[INS]}
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149
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150 Select multiple:
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151
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152 @b{[X]} This
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153 @b{[ ]} That
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154 @b{[X]} Thus
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155
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156 Select one:
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157
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158 @b{(*)} One
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159 @b{( )} Another One.
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160 @b{( )} A Final One.
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161
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162 @b{[Apply Form]} @b{[Reset Form]}
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163 @end example
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164
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165 The top level widgets in is example are tagged @samp{Name},
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166 @samp{Choose}, @samp{Address}, @samp{_other work_}, @samp{Numbers},
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167 @samp{Select multiple}, @samp{Select one}, @samp{[Apply Form]}, and
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168 @samp{[Reset Form]}. There are basically two thing the user can do within
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169 a form, namely editing the editable text fields and activating the
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170 buttons.
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171
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172 @subsection Editable Text Fields
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173
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174 In the example, the value for the @samp{Name} is most likely displayed
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175 in an editable text field, and so are values for each of the members of
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176 the @samp{Numbers} list. All the normal Emacs editing operations are
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177 available for editing these fields. The only restriction is that each
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178 change you make must be contained within a single editable text field.
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179 For example, capitalizing all text from the middle of one field to the
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180 middle of another field is prohibited.
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181
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182 Editing text fields are created by the @code{editable-field} widget.
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183
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184 The editing text fields are highlighted with the
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185 @code{widget-field-face} face, making them easy to find.
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186
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187 @deffn Face widget-field-face
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188 Face used for other editing fields.
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189 @end deffn
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190
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191 @subsection Buttons
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192
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193 Some portions of the buffer have an associated @dfn{action}, which can
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194 be @dfn{activated} by a standard key or mouse command. These portions
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195 are called @dfn{buttons}. The default commands for activating a button
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196 are:
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197
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198 @table @kbd
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199 @item @key{RET}
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200 @deffn Command widget-button-press @var{pos} &optional @var{event}
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201 Activate the button at @var{pos}, defaulting to point.
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202 If point is not located on a button, activate the binding in
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203 @code{widget-global-map} (by default the global map).
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204 @end deffn
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205
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206 @item mouse-2
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207 @deffn Command widget-button-click @var{event}
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208 Activate the button at the location of the mouse pointer. If the mouse
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209 pointer is located in an editable text field, activate the binding in
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210 @code{widget-global-map} (by default the global map).
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211 @end deffn
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212 @end table
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213
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214 There are several different kind of buttons, all of which are present in
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215 the example:
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216
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217 @table @emph
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218 @item The Option Field Tags.
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219 When you activate one of these buttons, you will be asked to choose
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220 between a number of different options. This is how you edit an option
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221 field. Option fields are created by the @code{menu-choice} widget. In
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222 the example, @samp{@b{Choose}} is an option field tag.
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223 @item The @samp{@b{[INS]}} and @samp{@b{[DEL]}} buttons.
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224 Activating these will insert or delete elements from a editable list.
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225 The list is created by the @code{editable-list} widget.
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226 @item Embedded Buttons.
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227 The @samp{@b{_other work_}} is an example of an embedded
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228 button. Embedded buttons are not associated with a fields, but can serve
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229 any purpose, such as implementing hypertext references. They are
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230 usually created by the @code{link} widget.
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231 @item The @samp{@b{[ ]}} and @samp{@b{[X]}} buttons.
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232 Activating one of these will convert it to the other. This is useful
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233 for implementing multiple-choice fields. You can create it wit
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234 @item The @samp{@b{( )}} and @samp{@b{(*)}} buttons.
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235 Only one radio button in a @code{radio-button-choice} widget can be
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236 selected at any time. When you push one of the unselected radio
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237 buttons, it will be selected and the previous selected radio button will
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238 become unselected.
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239 @item The @samp{@b{[Apply Form]}} @samp{@b{[Reset Form]}} buttons.
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240 These are explicit buttons made with the @code{push-button} widget. The main
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241 difference from the @code{link} widget is that the buttons are will be
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242 displayed as GUI buttons when possible.
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243 enough.
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244 @end table
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245
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246 To make them easier to locate, buttons are emphasized in the buffer.
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247
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248 @deffn Face widget-button-face
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249 Face used for buttons.
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250 @end deffn
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251
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252 @defopt widget-mouse-face
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253 Face used for buttons when the mouse pointer is above it.
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254 @end defopt
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255
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256 @subsection Navigation
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257
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258 You can use all the normal Emacs commands to move around in a form
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259 buffer, plus you will have these additional commands:
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260
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261 @table @kbd
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262 @item @key{TAB}
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263 @deffn Command widget-forward &optional count
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264 Move point @var{count} buttons or editing fields forward.
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265 @end deffn
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266 @item @key{M-TAB}
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267 @deffn Command widget-backward &optional count
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268 Move point @var{count} buttons or editing fields backward.
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269 @end deffn
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270 @end table
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271
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272 @node Programming Example, Setting Up the Buffer, User Interface, Top
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273 @comment node-name, next, previous, up
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274 @section Programming Example
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275
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276 Here is the code to implement the user interface example (see @ref{User
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277 Interface}).
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278
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279 @lisp
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280 (require 'widget)
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281
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282 (eval-when-compile
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283 (require 'wid-edit))
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284
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285 (defvar widget-example-repeat)
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286
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287 (defun widget-example ()
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288 "Create the widgets from the Widget manual."
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289 (interactive)
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290 (switch-to-buffer "*Widget Example*")
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291 (kill-all-local-variables)
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292 (make-local-variable 'widget-example-repeat)
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293 (let ((inhibit-read-only t))
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294 (erase-buffer))
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295 (widget-insert "Here is some documentation.\n\nName: ")
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296 (widget-create 'editable-field
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297 :size 13
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298 "My Name")
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299 (widget-create 'menu-choice
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300 :tag "Choose"
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301 :value "This"
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302 :help-echo "Choose me, please!"
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303 :notify (lambda (widget &rest ignore)
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304 (message "%s is a good choice!"
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305 (widget-value widget)))
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306 '(item :tag "This option" :value "This")
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307 '(choice-item "That option")
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308 '(editable-field :menu-tag "No option" "Thus option"))
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309 (widget-insert "Address: ")
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310 (widget-create 'editable-field
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311 "Some Place\nIn some City\nSome country.")
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312 (widget-insert "\nSee also ")
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313 (widget-create 'link
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314 :notify (lambda (&rest ignore)
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315 (widget-value-set widget-example-repeat
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316 '("En" "To" "Tre"))
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317 (widget-setup))
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318 "other work")
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319 (widget-insert " for more information.\n\nNumbers: count to three below\n")
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320 (setq widget-example-repeat
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321 (widget-create 'editable-list
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322 :entry-format "%i %d %v"
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323 :notify (lambda (widget &rest ignore)
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324 (let ((old (widget-get widget
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325 ':example-length))
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326 (new (length (widget-value widget))))
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327 (unless (eq old new)
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328 (widget-put widget ':example-length new)
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329 (message "You can count to %d." new))))
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330 :value '("One" "Eh, two?" "Five!")
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331 '(editable-field :value "three")))
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332 (widget-insert "\n\nSelect multiple:\n\n")
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333 (widget-create 'checkbox t)
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334 (widget-insert " This\n")
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335 (widget-create 'checkbox nil)
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336 (widget-insert " That\n")
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337 (widget-create 'checkbox
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338 :notify (lambda (&rest ignore) (message "Tickle"))
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339 t)
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340 (widget-insert " Thus\n\nSelect one:\n\n")
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341 (widget-create 'radio-button-choice
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342 :value "One"
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343 :notify (lambda (widget &rest ignore)
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344 (message "You selected %s"
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345 (widget-value widget)))
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346 '(item "One") '(item "Anthor One.") '(item "A Final One."))
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347 (widget-insert "\n")
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348 (widget-create 'push-button
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349 :notify (lambda (&rest ignore)
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350 (if (= (length (widget-value widget-example-repeat))
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351 3)
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352 (message "Congratulation!")
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353 (error "Three was the count!")))
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354 "Apply Form")
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355 (widget-insert " ")
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356 (widget-create 'push-button
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357 :notify (lambda (&rest ignore)
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358 (widget-example))
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359 "Reset Form")
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360 (widget-insert "\n")
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361 (use-local-map widget-keymap)
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362 (widget-setup))
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363 @end lisp
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364
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365 @node Setting Up the Buffer, Basic Types, Programming Example, Top
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366 @comment node-name, next, previous, up
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367 @section Setting Up the Buffer
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368
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369 Widgets are created with @code{widget-create}, which returns a
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370 @dfn{widget} object. This object can be queried and manipulated by
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371 other widget functions, until it is deleted with @code{widget-delete}.
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372 After the widgets have been created, @code{widget-setup} must be called
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373 to enable them.
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374
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375 @defun widget-create type [ keyword argument ]@dots{}
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376 Create and return a widget of type @var{type}.
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377 The syntax for the @var{type} argument is described in @ref{Basic Types}.
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378
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379 The keyword arguments can be used to overwrite the keyword arguments
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380 that are part of @var{type}.
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381 @end defun
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382
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383 @defun widget-delete widget
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384 Delete @var{widget} and remove it from the buffer.
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385 @end defun
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386
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387 @defun widget-setup
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388 Setup a buffer to support widgets.
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389
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390 This should be called after creating all the widgets and before allowing
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391 the user to edit them.
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392 @refill
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393 @end defun
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394
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395 If you want to insert text outside the widgets in the form, the
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396 recommended way to do that is with @code{widget-insert}.
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397
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398 @defun widget-insert
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399 Insert the arguments, either strings or characters, at point.
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400 The inserted text will be read only.
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401 @end defun
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402
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|
403 There is a standard widget keymap which you might find useful.
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|
|
404
|
|
|
405 @defvr Const widget-keymap
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|
108
|
406 A keymap with the global keymap as its parent.@*
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|
98
|
407 @key{TAB} and @kbd{C-@key{TAB}} are bound to @code{widget-forward} and
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|
|
408 @code{widget-backward}, respectively. @kbd{@key{RET}} and @kbd{mouse-2}
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|
409 are bound to @code{widget-button-press} and
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|
410 @code{widget-button-}.@refill
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|
411 @end defvr
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|
412
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|
413 @defvar widget-global-map
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|
414 Keymap used by @code{widget-button-press} and @code{widget-button-click}
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|
|
415 when not on a button. By default this is @code{global-map}.
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|
416 @end defvar
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417
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|
418 @node Basic Types, Sexp Types, Setting Up the Buffer, Top
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|
|
419 @comment node-name, next, previous, up
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|
420 @section Basic Types
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|
|
421
|
|
|
422 The syntax of a type specification is given below:
|
|
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423
|
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|
424 @example
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|
|
425 NAME ::= (NAME [KEYWORD ARGUMENT]... ARGS)
|
|
|
426 | NAME
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|
|
427 @end example
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428
|
|
|
429 Where, @var{name} is a widget name, @var{keyword} is the name of a
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|
430 property, @var{argument} is the value of the property, and @var{args}
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|
|
431 are interpreted in a widget specific way.
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432
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|
433 There following keyword arguments that apply to all widgets:
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|
434
|
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|
435 @table @code
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436 @item :value
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|
|
437 The initial value for widgets of this type.
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438
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|
|
439 @item :format
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|
440 This string will be inserted in the buffer when you create a widget.
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|
|
441 The following @samp{%} escapes are available:
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442
|
|
|
443 @table @samp
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|
444 @item %[
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|
445 @itemx %]
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|
446 The text inside will be marked as a button.
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447
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448 @item %@{
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|
|
449 @itemx %@}
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|
|
450 The text inside will be displayed with the face specified by
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|
|
451 @code{:sample-face}.
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|
452
|
|
|
453 @item %v
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|
454 This will be replaces with the buffer representation of the widgets
|
|
|
455 value. What this is depends on the widget type.
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|
|
456
|
|
|
457 @item %d
|
|
|
458 Insert the string specified by @code{:doc} here.
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|
|
459
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|
|
460 @item %h
|
|
|
461 Like @samp{%d}, with the following modifications: If the documentation
|
|
|
462 string is more than one line, it will add a button which will toggle
|
|
|
463 between showing only the first line, and showing the full text.
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|
|
464 Furthermore, if there is no @code{:doc} property in the widget, it will
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|
|
465 instead examine the @code{:documentation-property} property. If it is a
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|
|
466 lambda expression, it will be called with the widget's value as an
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|
|
467 argument, and the result will be used as the documentation text.
|
|
|
468
|
|
|
469 @item %t
|
|
|
470 Insert the string specified by @code{:tag} here, or the @code{princ}
|
|
|
471 representation of the value if there is no tag.
|
|
|
472
|
|
|
473 @item %%
|
|
|
474 Insert a literal @samp{%}.
|
|
|
475 @end table
|
|
|
476
|
|
|
477 @item :button-face
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|
|
478 Face used to highlight text inside %[ %] in the format.
|
|
|
479
|
|
|
480 @item :doc
|
|
|
481 The string inserted by the @samp{%d} escape in the format
|
|
|
482 string.
|
|
|
483
|
|
|
484 @item :tag
|
|
|
485 The string inserted by the @samp{%t} escape in the format
|
|
|
486 string.
|
|
|
487
|
|
|
488 @item :tag-glyph
|
|
|
489 Name of image to use instead of the string specified by `:tag' on
|
|
|
490 Emacsen that supports it.
|
|
|
491
|
|
|
492 @item :help-echo
|
|
|
493 Message displayed whenever you move to the widget with either
|
|
|
494 @code{widget-forward} or @code{widget-backward}.
|
|
|
495
|
|
|
496 @item :indent
|
|
|
497 An integer indicating the absolute number of spaces to indent children
|
|
|
498 of this widget.
|
|
|
499
|
|
|
500 @item :offset
|
|
|
501 An integer indicating how many extra spaces to add to the widget's
|
|
|
502 grandchildren compared to this widget.
|
|
|
503
|
|
|
504 @item :extra-offset
|
|
|
505 An integer indicating how many extra spaces to add to the widget's
|
|
|
506 children compared to this widget.
|
|
|
507
|
|
|
508 @item :notify
|
|
|
509 A function called each time the widget or a nested widget is changed.
|
|
|
510 The function is called with two or three arguments. The first argument
|
|
|
511 is the widget itself, the second argument is the widget that was
|
|
|
512 changed, and the third argument is the event leading to the change, if
|
|
|
513 any.
|
|
|
514
|
|
|
515 @item :menu-tag
|
|
|
516 Tag used in the menu when the widget is used as an option in a
|
|
|
517 @code{menu-choice} widget.
|
|
|
518
|
|
|
519 @item :menu-tag-get
|
|
|
520 Function used for finding the tag when the widget is used as an option
|
|
|
521 in a @code{menu-choice} widget. By default, the tag used will be either the
|
|
|
522 @code{:menu-tag} or @code{:tag} property if present, or the @code{princ}
|
|
|
523 representation of the @code{:value} property if not.
|
|
|
524
|
|
|
525 @item :match
|
|
|
526 Should be a function called with two arguments, the widget and a value,
|
|
|
527 and returning non-nil if the widget can represent the specified value.
|
|
|
528
|
|
|
529 @item :validate
|
|
|
530 A function which takes a widget as an argument, and return nil if the
|
|
|
531 widgets current value is valid for the widget. Otherwise, it should
|
|
|
532 return the widget containing the invalid data, and set that widgets
|
|
|
533 @code{:error} property to a string explaining the error.
|
|
|
534
|
|
149
|
535 The following predefined function can be used:
|
|
|
536
|
|
|
537 @defun widget-children-validate widget
|
|
|
538 All the @code{:children} of @var{widget} must be valid.
|
|
|
539 @end defun
|
|
|
540
|
|
110
|
541 @item :tab-order
|
|
|
542 Specify the order in which widgets are traversed with
|
|
|
543 @code{widget-forward} or @code{widget-backward}. This is only partially
|
|
|
544 implemented.
|
|
|
545
|
|
|
546 @enumerate a
|
|
|
547 @item
|
|
|
548 Widgets with tabbing order @code{-1} are ignored.
|
|
|
549
|
|
|
550 @item
|
|
|
551 (Unimplemented) When on a widget with tabbing order @var{n}, go to the
|
|
|
552 next widget in the buffer with tabbing order @var{n+1} or @code{nil},
|
|
|
553 whichever comes first.
|
|
|
554
|
|
|
555 @item
|
|
|
556 When on a widget with no tabbing order specified, go to the next widget
|
|
|
557 in the buffer with a positive tabbing order, or @code{nil}
|
|
|
558 @end enumerate
|
|
|
559
|
|
98
|
560 @item :parent
|
|
110
|
561 The parent of a nested widget (e.g. a @code{menu-choice} item or an
|
|
|
562 element of a @code{editable-list} widget).
|
|
108
|
563
|
|
|
564 @item :sibling-args
|
|
|
565 This keyword is only used for members of a @code{radio-button-choice} or
|
|
|
566 @code{checklist}. The value should be a list of extra keyword
|
|
|
567 arguments, which will be used when creating the @code{radio-button} or
|
|
|
568 @code{checkbox} associated with this item.
|
|
|
569
|
|
98
|
570 @end table
|
|
|
571
|
|
|
572 @deffn {User Option} widget-glyph-directory
|
|
|
573 Directory where glyphs are found.
|
|
|
574 Widget will look here for a file with the same name as specified for the
|
|
|
575 image, with either a @samp{.xpm} (if supported) or @samp{.xbm} extension.
|
|
|
576 @end deffn
|
|
|
577
|
|
|
578 @deffn{User Option} widget-glyph-enable
|
|
|
579 If non-nil, allow glyphs to appear on displayes where they are supported.
|
|
|
580 @end deffn
|
|
|
581
|
|
|
582
|
|
|
583 @menu
|
|
|
584 * link::
|
|
|
585 * url-link::
|
|
|
586 * info-link::
|
|
|
587 * push-button::
|
|
|
588 * editable-field::
|
|
|
589 * text::
|
|
|
590 * menu-choice::
|
|
|
591 * radio-button-choice::
|
|
|
592 * item::
|
|
|
593 * choice-item::
|
|
|
594 * toggle::
|
|
|
595 * checkbox::
|
|
|
596 * checklist::
|
|
|
597 * editable-list::
|
|
149
|
598 * group::
|
|
98
|
599 @end menu
|
|
|
600
|
|
|
601 @node link, url-link, Basic Types, Basic Types
|
|
|
602 @comment node-name, next, previous, up
|
|
|
603 @subsection The @code{link} Widget
|
|
|
604
|
|
|
605 Syntax:
|
|
|
606
|
|
|
607 @example
|
|
|
608 TYPE ::= (link [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
609 @end example
|
|
|
610
|
|
|
611 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
612 property. The value should be a string, which will be inserted in the
|
|
|
613 buffer.
|
|
|
614
|
|
|
615 @node url-link, info-link, link, Basic Types
|
|
|
616 @comment node-name, next, previous, up
|
|
|
617 @subsection The @code{url-link} Widget
|
|
|
618
|
|
|
619 Syntax:
|
|
|
620
|
|
|
621 @example
|
|
|
622 TYPE ::= (url-link [KEYWORD ARGUMENT]... URL)
|
|
|
623 @end example
|
|
|
624
|
|
|
625 When this link is activated, the @sc{www} browser specified by
|
|
|
626 @code{browse-url-browser-function} will be called with @var{url}.
|
|
|
627
|
|
|
628 @node info-link, push-button, url-link, Basic Types
|
|
|
629 @comment node-name, next, previous, up
|
|
|
630 @subsection The @code{info-link} Widget
|
|
|
631
|
|
|
632 Syntax:
|
|
|
633
|
|
|
634 @example
|
|
|
635 TYPE ::= (info-link [KEYWORD ARGUMENT]... ADDRESS)
|
|
|
636 @end example
|
|
|
637
|
|
|
638 When this link is activated, the build-in info browser is started on
|
|
|
639 @var{address}.
|
|
|
640
|
|
|
641 @node push-button, editable-field, info-link, Basic Types
|
|
|
642 @comment node-name, next, previous, up
|
|
|
643 @subsection The @code{push-button} Widget
|
|
|
644
|
|
|
645 Syntax:
|
|
|
646
|
|
|
647 @example
|
|
|
648 TYPE ::= (push-button [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
649 @end example
|
|
|
650
|
|
|
651 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
652 property. The value should be a string, which will be inserted in the
|
|
|
653 buffer.
|
|
|
654
|
|
120
|
655 The following extra properties are recognized.
|
|
|
656
|
|
|
657 @table @code
|
|
|
658 @item :text-format
|
|
|
659 The format string used when the push button cannot be displayed
|
|
|
660 graphically. There are two escapes, @code{%s}, which must be present
|
|
|
661 exactly once, will be substituted with the tag, and @code{%%} will be
|
|
|
662 substituted with a singe @samp{%}.
|
|
|
663 @end table
|
|
|
664
|
|
|
665 By default the tag will be shown in brackets.
|
|
|
666
|
|
98
|
667 @node editable-field, text, push-button, Basic Types
|
|
|
668 @comment node-name, next, previous, up
|
|
|
669 @subsection The @code{editable-field} Widget
|
|
|
670
|
|
|
671 Syntax:
|
|
|
672
|
|
|
673 @example
|
|
|
674 TYPE ::= (editable-field [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
675 @end example
|
|
|
676
|
|
|
677 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
678 property. The value should be a string, which will be inserted in
|
|
|
679 field. This widget will match all string values.
|
|
|
680
|
|
|
681 The following extra properties are recognized.
|
|
|
682
|
|
|
683 @table @code
|
|
|
684 @item :size
|
|
108
|
685 The width of the editable field.@*
|
|
98
|
686 By default the field will reach to the end of the line.
|
|
|
687
|
|
|
688 @item :value-face
|
|
|
689 Face used for highlighting the editable field. Default is
|
|
|
690 @code{widget-field-face}.
|
|
|
691
|
|
|
692 @item :secret
|
|
|
693 Character used to display the value. You can set this to e.g. @code{?*}
|
|
|
694 if the field contains a password or other secret information. By
|
|
|
695 default, the value is not secret.
|
|
|
696
|
|
|
697 @item :valid-regexp
|
|
|
698 By default the @code{:validate} function will match the content of the
|
|
|
699 field with the value of this attribute. The default value is @code{""}
|
|
|
700 which matches everything.
|
|
|
701
|
|
|
702 @item :keymap
|
|
|
703 Keymap used in the editable field. The default value is
|
|
|
704 @code{widget-field-keymap}, which allows you to use all the normal
|
|
|
705 editing commands, even if the buffers major mode supress some of them.
|
|
|
706 Pressing return activates the function specified by @code{:activate}.
|
|
|
707
|
|
|
708 @item :hide-front-space
|
|
|
709 @itemx :hide-rear-space
|
|
|
710 In order to keep track of the editable field, emacs places an invisible
|
|
|
711 space character in front of the field, and for fixed sized fields also
|
|
|
712 in the rear end of the field. For fields that extent to the end of the
|
|
|
713 line, the terminating linefeed serves that purpose instead.
|
|
|
714
|
|
|
715 Emacs will try to make the spaces intangible when it is safe to do so.
|
|
|
716 Intangible means that the cursor motion commands will skip over the
|
|
|
717 character as if it didn't exist. This is safe to do when the text
|
|
|
718 preceding or following the widget cannot possible change during the
|
|
|
719 lifetime of the @code{editable-field} widget. The preferred way to tell
|
|
|
720 Emacs this, is to add text to the @code{:format} property around the
|
|
|
721 value. For example @code{:format "Tag: %v "}.
|
|
|
722
|
|
|
723 You can overwrite the internal safety check by setting the
|
|
|
724 @code{:hide-front-space} or @code{:hide-rear-space} properties to
|
|
|
725 non-nil. This is not recommended. For example, @emph{all} text that
|
|
|
726 belongs to a widget (i.e. is created from its @code{:format} string) will
|
|
|
727 change whenever the widget changes its value.
|
|
|
728
|
|
|
729 @end table
|
|
|
730
|
|
|
731 @node text, menu-choice, editable-field, Basic Types
|
|
|
732 @comment node-name, next, previous, up
|
|
|
733 @subsection The @code{text} Widget
|
|
|
734
|
|
|
735 This is just like @code{editable-field}, but intended for multiline text
|
|
|
736 fields. The default @code{:keymap} is @code{widget-text-keymap}, which
|
|
|
737 does not rebind the return key.
|
|
|
738
|
|
|
739 @node menu-choice, radio-button-choice, text, Basic Types
|
|
|
740 @comment node-name, next, previous, up
|
|
|
741 @subsection The @code{menu-choice} Widget
|
|
|
742
|
|
|
743 Syntax:
|
|
|
744
|
|
|
745 @example
|
|
|
746 TYPE ::= (menu-choice [KEYWORD ARGUMENT]... TYPE ... )
|
|
|
747 @end example
|
|
|
748
|
|
|
749 The @var{type} arguments represents each possible choice. The widgets
|
|
|
750 value of will be the value of the chosen @var{type} argument. This
|
|
|
751 widget will match any value that matches at least one of the specified
|
|
|
752 @var{type} arguments.
|
|
|
753
|
|
|
754 @table @code
|
|
|
755 @item :void
|
|
|
756 Widget type used as a fallback when the value does not match any of the
|
|
|
757 specified @var{type} arguments.
|
|
|
758
|
|
|
759 @item :case-fold
|
|
|
760 Set this to nil if you don't want to ignore case when prompting for a
|
|
|
761 choice through the minibuffer.
|
|
|
762
|
|
|
763 @item :children
|
|
|
764 A list whose car is the widget representing the currently chosen type in
|
|
|
765 the buffer.
|
|
|
766
|
|
|
767 @item :choice
|
|
|
768 The current chosen type
|
|
|
769
|
|
|
770 @item :args
|
|
|
771 The list of types.
|
|
|
772 @end table
|
|
|
773
|
|
|
774 @node radio-button-choice, item, menu-choice, Basic Types
|
|
|
775 @comment node-name, next, previous, up
|
|
|
776 @subsection The @code{radio-button-choice} Widget
|
|
|
777
|
|
|
778 Syntax:
|
|
|
779
|
|
|
780 @example
|
|
|
781 TYPE ::= (radio-button-choice [KEYWORD ARGUMENT]... TYPE ... )
|
|
|
782 @end example
|
|
|
783
|
|
|
784 The @var{type} arguments represents each possible choice. The widgets
|
|
|
785 value of will be the value of the chosen @var{type} argument. This
|
|
|
786 widget will match any value that matches at least one of the specified
|
|
|
787 @var{type} arguments.
|
|
|
788
|
|
|
789 The following extra properties are recognized.
|
|
|
790
|
|
|
791 @table @code
|
|
|
792 @item :entry-format
|
|
|
793 This string will be inserted for each entry in the list.
|
|
|
794 The following @samp{%} escapes are available:
|
|
|
795 @table @samp
|
|
|
796 @item %v
|
|
|
797 Replaced with the buffer representation of the @var{type} widget.
|
|
|
798 @item %b
|
|
|
799 Replace with the radio button.
|
|
|
800 @item %%
|
|
|
801 Insert a literal @samp{%}.
|
|
|
802 @end table
|
|
|
803
|
|
108
|
804 @item button-args
|
|
|
805 A list of keywords to pass to the radio buttons. Useful for setting
|
|
|
806 e.g. the @samp{:help-echo} for each button.
|
|
|
807
|
|
98
|
808 @item :buttons
|
|
|
809 The widgets representing the radio buttons.
|
|
|
810
|
|
|
811 @item :children
|
|
|
812 The widgets representing each type.
|
|
|
813
|
|
|
814 @item :choice
|
|
|
815 The current chosen type
|
|
|
816
|
|
|
817 @item :args
|
|
|
818 The list of types.
|
|
|
819 @end table
|
|
|
820
|
|
|
821 You can add extra radio button items to a @code{radio-button-choice}
|
|
|
822 widget after it has been created with the function
|
|
|
823 @code{widget-radio-add-item}.
|
|
|
824
|
|
|
825 @defun widget-radio-add-item widget type
|
|
|
826 Add to @code{radio-button-choice} widget @var{widget} a new radio button item of type
|
|
|
827 @var{type}.
|
|
|
828 @end defun
|
|
|
829
|
|
|
830 Please note that such items added after the @code{radio-button-choice}
|
|
|
831 widget has been created will @strong{not} be properly destructed when
|
|
|
832 you call @code{widget-delete}.
|
|
|
833
|
|
|
834 @node item, choice-item, radio-button-choice, Basic Types
|
|
|
835 @comment node-name, next, previous, up
|
|
|
836 @subsection The @code{item} Widget
|
|
|
837
|
|
|
838 Syntax:
|
|
|
839
|
|
|
840 @example
|
|
|
841 ITEM ::= (item [KEYWORD ARGUMENT]... VALUE)
|
|
|
842 @end example
|
|
|
843
|
|
|
844 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
845 property. The value should be a string, which will be inserted in the
|
|
|
846 buffer. This widget will only match the specified value.
|
|
|
847
|
|
|
848 @node choice-item, toggle, item, Basic Types
|
|
|
849 @comment node-name, next, previous, up
|
|
|
850 @subsection The @code{choice-item} Widget
|
|
|
851
|
|
|
852 Syntax:
|
|
|
853
|
|
|
854 @example
|
|
|
855 ITEM ::= (choice-item [KEYWORD ARGUMENT]... VALUE)
|
|
|
856 @end example
|
|
|
857
|
|
|
858 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
859 property. The value should be a string, which will be inserted in the
|
|
|
860 buffer as a button. Activating the button of a @code{choice-item} is
|
|
|
861 equivalent to activating the parent widget. This widget will only match
|
|
|
862 the specified value.
|
|
|
863
|
|
|
864 @node toggle, checkbox, choice-item, Basic Types
|
|
|
865 @comment node-name, next, previous, up
|
|
|
866 @subsection The @code{toggle} Widget
|
|
|
867
|
|
|
868 Syntax:
|
|
|
869
|
|
|
870 @example
|
|
|
871 TYPE ::= (toggle [KEYWORD ARGUMENT]...)
|
|
|
872 @end example
|
|
|
873
|
|
|
874 The widget has two possible states, `on' and `off', which corresponds to
|
|
|
875 a @code{t} or @code{nil} value.
|
|
|
876
|
|
|
877 The following extra properties are recognized.
|
|
|
878
|
|
|
879 @table @code
|
|
|
880 @item :on
|
|
|
881 String representing the `on' state. By default the string @samp{on}.
|
|
|
882 @item :off
|
|
|
883 String representing the `off' state. By default the string @samp{off}.
|
|
|
884 @item :on-glyph
|
|
|
885 Name of a glyph to be used instead of the `:on' text string, on emacsen
|
|
|
886 that supports it.
|
|
|
887 @item :off-glyph
|
|
|
888 Name of a glyph to be used instead of the `:off' text string, on emacsen
|
|
|
889 that supports it.
|
|
|
890 @end table
|
|
|
891
|
|
|
892 @node checkbox, checklist, toggle, Basic Types
|
|
|
893 @comment node-name, next, previous, up
|
|
|
894 @subsection The @code{checkbox} Widget
|
|
|
895
|
|
|
896 The widget has two possible states, `selected' and `unselected', which
|
|
|
897 corresponds to a @code{t} or @code{nil} value.
|
|
|
898
|
|
|
899 Syntax:
|
|
|
900
|
|
|
901 @example
|
|
|
902 TYPE ::= (checkbox [KEYWORD ARGUMENT]...)
|
|
|
903 @end example
|
|
|
904
|
|
|
905 @node checklist, editable-list, checkbox, Basic Types
|
|
|
906 @comment node-name, next, previous, up
|
|
|
907 @subsection The @code{checklist} Widget
|
|
|
908
|
|
|
909 Syntax:
|
|
|
910
|
|
|
911 @example
|
|
|
912 TYPE ::= (checklist [KEYWORD ARGUMENT]... TYPE ... )
|
|
|
913 @end example
|
|
|
914
|
|
|
915 The @var{type} arguments represents each checklist item. The widgets
|
|
|
916 value of will be a list containing the value of each ticked @var{type}
|
|
|
917 argument. The checklist widget will match a list whose elements all
|
|
|
918 matches at least one of the specified @var{type} arguments.
|
|
|
919
|
|
|
920 The following extra properties are recognized.
|
|
|
921
|
|
|
922 @table @code
|
|
|
923 @item :entry-format
|
|
|
924 This string will be inserted for each entry in the list.
|
|
|
925 The following @samp{%} escapes are available:
|
|
|
926 @table @samp
|
|
|
927 @item %v
|
|
|
928 Replaced with the buffer representation of the @var{type} widget.
|
|
|
929 @item %b
|
|
|
930 Replace with the checkbox.
|
|
|
931 @item %%
|
|
|
932 Insert a literal @samp{%}.
|
|
|
933 @end table
|
|
|
934
|
|
149
|
935 @item :greedy
|
|
|
936 Usually, a checklist will only match if the items are in the exact
|
|
|
937 sequence given in the specification. By setting @code{:greedy} to
|
|
|
938 non-nil, it will allow the items to come in any sequence. However, if
|
|
|
939 you extract the value they will be in the sequence given in the
|
|
|
940 checklist. I.e. the original sequence is forgotten.
|
|
|
941
|
|
108
|
942 @item button-args
|
|
|
943 A list of keywords to pass to the checkboxes. Useful for setting
|
|
|
944 e.g. the @samp{:help-echo} for each checkbox.
|
|
|
945
|
|
98
|
946 @item :buttons
|
|
|
947 The widgets representing the checkboxes.
|
|
|
948
|
|
|
949 @item :children
|
|
|
950 The widgets representing each type.
|
|
|
951
|
|
|
952 @item :args
|
|
|
953 The list of types.
|
|
|
954 @end table
|
|
|
955
|
|
149
|
956 @node editable-list, group, checklist, Basic Types
|
|
98
|
957 @comment node-name, next, previous, up
|
|
|
958 @subsection The @code{editable-list} Widget
|
|
|
959
|
|
|
960 Syntax:
|
|
|
961
|
|
|
962 @example
|
|
|
963 TYPE ::= (editable-list [KEYWORD ARGUMENT]... TYPE)
|
|
|
964 @end example
|
|
|
965
|
|
149
|
966 The value is a list, where each member represents one widget of type
|
|
98
|
967 @var{type}.
|
|
|
968
|
|
|
969 The following extra properties are recognized.
|
|
|
970
|
|
|
971 @table @code
|
|
|
972 @item :entry-format
|
|
|
973 This string will be inserted for each entry in the list.
|
|
|
974 The following @samp{%} escapes are available:
|
|
|
975 @table @samp
|
|
|
976 @item %v
|
|
|
977 This will be replaced with the buffer representation of the @var{type}
|
|
|
978 widget.
|
|
|
979 @item %i
|
|
|
980 Insert the @b{[INS]} button.
|
|
|
981 @item %d
|
|
|
982 Insert the @b{[DEL]} button.
|
|
|
983 @item %%
|
|
|
984 Insert a literal @samp{%}.
|
|
|
985 @end table
|
|
|
986
|
|
108
|
987 @item :insert-button-args
|
|
|
988 A list of keyword arguments to pass to the insert buttons.
|
|
|
989
|
|
|
990 @item :delete-button-args
|
|
|
991 A list of keyword arguments to pass to the delete buttons.
|
|
|
992
|
|
|
993 @item :append-button-args
|
|
|
994 A list of keyword arguments to pass to the trailing insert button.
|
|
|
995
|
|
|
996
|
|
98
|
997 @item :buttons
|
|
|
998 The widgets representing the insert and delete buttons.
|
|
|
999
|
|
|
1000 @item :children
|
|
|
1001 The widgets representing the elements of the list.
|
|
|
1002
|
|
|
1003 @item :args
|
|
|
1004 List whose car is the type of the list elements.
|
|
|
1005
|
|
|
1006 @end table
|
|
|
1007
|
|
149
|
1008 @node group, , editable-list, Basic Types
|
|
|
1009 @comment node-name, next, previous, up
|
|
|
1010 @subsection The @code{group} Widget
|
|
|
1011
|
|
|
1012 This widget simply group other widget together.
|
|
|
1013
|
|
|
1014 Syntax:
|
|
|
1015
|
|
|
1016 @example
|
|
|
1017 TYPE ::= (group [KEYWORD ARGUMENT]... TYPE...)
|
|
|
1018 @end example
|
|
|
1019
|
|
|
1020 The value is a list, with one member for each @var{type}.
|
|
|
1021
|
|
98
|
1022 @node Sexp Types, Widget Properties, Basic Types, Top
|
|
|
1023 @comment
|
|
|
1024 @section Sexp Types
|
|
|
1025
|
|
|
1026 A number of widgets for editing s-expressions (lisp types) are also
|
|
149
|
1027 available. These basically fall in the following categories.
|
|
98
|
1028
|
|
|
1029 @menu
|
|
149
|
1030 * constants::
|
|
98
|
1031 * generic::
|
|
|
1032 * atoms::
|
|
|
1033 * composite::
|
|
|
1034 @end menu
|
|
|
1035
|
|
149
|
1036 @node constants, generic, Sexp Types, Sexp Types
|
|
98
|
1037 @comment node-name, next, previous, up
|
|
149
|
1038 @subsection The Constant Widgets.
|
|
98
|
1039
|
|
149
|
1040 The @code{const} widget can contain any lisp expression, but the user is
|
|
98
|
1041 prohibited from editing edit it, which is mainly useful as a component
|
|
|
1042 of one of the composite widgets.
|
|
|
1043
|
|
149
|
1044 The syntax for the @code{const} widget is
|
|
98
|
1045
|
|
|
1046 @example
|
|
|
1047 TYPE ::= (const [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
1048 @end example
|
|
|
1049
|
|
|
1050 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
1051 property and can be any s-expression.
|
|
|
1052
|
|
|
1053 @deffn Widget const
|
|
|
1054 This will display any valid s-expression in an immutable part of the
|
|
|
1055 buffer.
|
|
|
1056 @end deffn
|
|
|
1057
|
|
149
|
1058 There are two variations of the @code{const} widget, namely
|
|
|
1059 @code{variable-item} and @code{function-item}. These should contain a
|
|
|
1060 symbol with a variable or function binding. The major difference from
|
|
|
1061 the @code{const} widget is that they will allow the user to see the
|
|
|
1062 variable or function documentation for the symbol.
|
|
|
1063
|
|
|
1064 @deffn Widget variable-item
|
|
|
1065 An immutable symbol that is bound as a variable.
|
|
|
1066 @end deffn
|
|
|
1067
|
|
|
1068 @deffn Widget function-item
|
|
|
1069 An immutable symbol that is bound as a function.
|
|
|
1070 @end deffn
|
|
|
1071
|
|
|
1072 @node generic, atoms, constants, Sexp Types
|
|
|
1073 @comment node-name, next, previous, up
|
|
|
1074 @subsection Generic Sexp Widget.
|
|
|
1075
|
|
|
1076 The @code{sexp} widget can contain any lisp expression, and allows the
|
|
|
1077 user to edit it inline in the buffer.
|
|
|
1078
|
|
|
1079 The syntax for the @code{sexp} widget is
|
|
|
1080
|
|
|
1081 @example
|
|
|
1082 TYPE ::= (sexp [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
1083 @end example
|
|
|
1084
|
|
98
|
1085 @deffn Widget sexp
|
|
|
1086 This will allow you to edit any valid s-expression in an editable buffer
|
|
|
1087 field.
|
|
|
1088
|
|
|
1089 The @code{sexp} widget takes the same keyword arguments as the
|
|
|
1090 @code{editable-field} widget.
|
|
|
1091 @end deffn
|
|
|
1092
|
|
|
1093 @node atoms, composite, generic, Sexp Types
|
|
|
1094 @comment node-name, next, previous, up
|
|
|
1095 @subsection Atomic Sexp Widgets.
|
|
|
1096
|
|
|
1097 The atoms are s-expressions that does not consist of other
|
|
|
1098 s-expressions. A string is an atom, while a list is a composite type.
|
|
|
1099 You can edit the value of an atom with the following widgets.
|
|
|
1100
|
|
|
1101 The syntax for all the atoms are
|
|
|
1102
|
|
|
1103 @example
|
|
|
1104 TYPE ::= (NAME [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
1105 @end example
|
|
|
1106
|
|
|
1107 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
1108 property and must be an expression of the same type as the widget.
|
|
|
1109 I.e. the string widget can only be initialized with a string.
|
|
|
1110
|
|
124
|
1111 All the atom widgets take the same keyword arguments as the
|
|
|
1112 @code{editable-field} widget.
|
|
98
|
1113
|
|
|
1114 @deffn Widget string
|
|
|
1115 Allows you to edit a string in an editable field.
|
|
|
1116 @end deffn
|
|
|
1117
|
|
149
|
1118 @deffn Widget regexp
|
|
|
1119 Allows you to edit a regular expression in an editable field.
|
|
|
1120 @end deffn
|
|
|
1121
|
|
124
|
1122 @deffn Widget character
|
|
|
1123 Allows you to enter a character in an editable field.
|
|
|
1124 @end deffn
|
|
|
1125
|
|
98
|
1126 @deffn Widget file
|
|
|
1127 Allows you to edit a file name in an editable field. You you activate
|
|
|
1128 the tag button, you can edit the file name in the mini-buffer with
|
|
|
1129 completion.
|
|
|
1130
|
|
|
1131 Keywords:
|
|
|
1132 @table @code
|
|
|
1133 @item :must-match
|
|
|
1134 If this is set to non-nil, only existing file names will be allowed in
|
|
|
1135 the minibuffer.
|
|
|
1136 @end table
|
|
|
1137 @end deffn
|
|
|
1138
|
|
|
1139 @deffn Widget directory
|
|
|
1140 Allows you to edit a directory name in an editable field.
|
|
|
1141 Similar to the @code{file} widget.
|
|
|
1142 @end deffn
|
|
|
1143
|
|
|
1144 @deffn Widget symbol
|
|
|
1145 Allows you to edit a lisp symbol in an editable field.
|
|
|
1146 @end deffn
|
|
|
1147
|
|
149
|
1148 @deffn Widget function
|
|
|
1149 Allows you to edit a lambda expression, or a function name with completion.
|
|
|
1150 @end deffn
|
|
|
1151
|
|
|
1152 @deffn Widget variable
|
|
|
1153 Allows you to edit a variable name, with completion.
|
|
|
1154 @end deffn
|
|
|
1155
|
|
98
|
1156 @deffn Widget integer
|
|
|
1157 Allows you to edit an integer in an editable field.
|
|
|
1158 @end deffn
|
|
|
1159
|
|
|
1160 @deffn Widget number
|
|
|
1161 Allows you to edit a number in an editable field.
|
|
|
1162 @end deffn
|
|
|
1163
|
|
|
1164 @deffn Widget boolean
|
|
|
1165 Allows you to edit a boolean. In lisp this means a variable which is
|
|
|
1166 either nil meaning false, or non-nil meaning true.
|
|
|
1167 @end deffn
|
|
|
1168
|
|
|
1169
|
|
|
1170 @node composite, , atoms, Sexp Types
|
|
|
1171 @comment node-name, next, previous, up
|
|
|
1172 @subsection Composite Sexp Widgets.
|
|
|
1173
|
|
|
1174 The syntax for the composite are
|
|
|
1175
|
|
|
1176 @example
|
|
|
1177 TYPE ::= (NAME [KEYWORD ARGUMENT]... COMPONENT...)
|
|
|
1178 @end example
|
|
|
1179
|
|
|
1180 Where each @var{component} must be a widget type. Each component widget
|
|
|
1181 will be displayed in the buffer, and be editable to the user.
|
|
|
1182
|
|
|
1183 @deffn Widget cons
|
|
|
1184 The value of a @code{cons} widget is a cons-cell where the car is the
|
|
|
1185 value of the first component and the cdr is the value of the second
|
|
|
1186 component. There must be exactly two components.
|
|
|
1187 @end deffn
|
|
|
1188
|
|
149
|
1189 @deffn Widget list
|
|
|
1190 The value of a @code{list} widget is a list containing the value of
|
|
98
|
1191 each of its component.
|
|
|
1192 @end deffn
|
|
|
1193
|
|
|
1194 @deffn Widget vector
|
|
|
1195 The value of a @code{vector} widget is a vector containing the value of
|
|
|
1196 each of its component.
|
|
|
1197 @end deffn
|
|
|
1198
|
|
|
1199 The above suffice for specifying fixed size lists and vectors. To get
|
|
|
1200 variable length lists and vectors, you can use a @code{choice},
|
|
|
1201 @code{set} or @code{repeat} widgets together with the @code{:inline}
|
|
|
1202 keywords. If any component of a composite widget has the @code{:inline}
|
|
|
1203 keyword set, its value must be a list which will then be spliced into
|
|
|
1204 the composite. For example, to specify a list whose first element must
|
|
|
1205 be a file name, and whose remaining arguments should either by the
|
|
|
1206 symbol @code{t} or two files, you can use the following widget
|
|
|
1207 specification:
|
|
|
1208
|
|
|
1209 @example
|
|
|
1210 (list file
|
|
|
1211 (choice (const t)
|
|
|
1212 (list :inline t
|
|
|
1213 :value ("foo" "bar")
|
|
|
1214 string string)))
|
|
|
1215 @end example
|
|
|
1216
|
|
|
1217 The value of a widget of this type will either have the form
|
|
|
1218 @samp{(file t)} or @code{(file string string)}.
|
|
|
1219
|
|
|
1220 This concept of inline is probably hard to understand. It was certainly
|
|
|
1221 hard to implement so instead of confuse you more by trying to explain it
|
|
|
1222 here, I'll just suggest you meditate over it for a while.
|
|
|
1223
|
|
|
1224 @deffn Widget choice
|
|
|
1225 Allows you to edit a sexp which may have one of fixed set of types. It
|
|
|
1226 is currently implemented with the @code{choice-menu} basic widget, and
|
|
|
1227 has a similar syntax.
|
|
|
1228 @end deffn
|
|
|
1229
|
|
|
1230 @deffn Widget set
|
|
|
1231 Allows you to specify a type which must be a list whose elements all
|
|
|
1232 belong to given set. The elements of the list is not significant. This
|
|
|
1233 is implemented on top of the @code{checklist} basic widget, and has a
|
|
|
1234 similar syntax.
|
|
|
1235 @end deffn
|
|
|
1236
|
|
|
1237 @deffn Widget repeat
|
|
|
1238 Allows you to specify a variable length list whose members are all of
|
|
|
1239 the same type. Implemented on top of the `editable-list' basic widget,
|
|
|
1240 and has a similar syntax.
|
|
|
1241 @end deffn
|
|
|
1242
|
|
|
1243 @node Widget Properties, Defining New Widgets, Sexp Types, Top
|
|
|
1244 @comment node-name, next, previous, up
|
|
|
1245 @section Properties
|
|
|
1246
|
|
|
1247 You can examine or set the value of a widget by using the widget object
|
|
|
1248 that was returned by @code{widget-create}.
|
|
|
1249
|
|
|
1250 @defun widget-value widget
|
|
|
1251 Return the current value contained in @var{widget}.
|
|
|
1252 It is an error to call this function on an uninitialized widget.
|
|
|
1253 @end defun
|
|
|
1254
|
|
|
1255 @defun widget-value-set widget value
|
|
|
1256 Set the value contained in @var{widget} to @var{value}.
|
|
|
1257 It is an error to call this function with an invalid @var{value}.
|
|
|
1258 @end defun
|
|
|
1259
|
|
|
1260 @strong{Important:} You @emph{must} call @code{widget-setup} after
|
|
|
1261 modifying the value of a widget before the user is allowed to edit the
|
|
|
1262 widget again. It is enough to call @code{widget-setup} once if you
|
|
|
1263 modify multiple widgets. This is currently only necessary if the widget
|
|
|
1264 contains an editing field, but may be necessary for other widgets in the
|
|
|
1265 future.
|
|
|
1266
|
|
|
1267 If your application needs to associate some information with the widget
|
|
|
1268 objects, for example a reference to the item being edited, it can be
|
|
|
1269 done with @code{widget-put} and @code{widget-get}. The property names
|
|
|
1270 must begin with a @samp{:}.
|
|
|
1271
|
|
|
1272 @defun widget-put widget property value
|
|
|
1273 In @var{widget} set @var{property} to @var{value}.
|
|
|
1274 @var{property} should be a symbol, while @var{value} can be anything.
|
|
|
1275 @end defun
|
|
|
1276
|
|
|
1277 @defun widget-get widget property
|
|
|
1278 In @var{widget} return the value for @var{property}.
|
|
|
1279 @var{property} should be a symbol, the value is what was last set by
|
|
|
1280 @code{widget-put} for @var{property}.
|
|
|
1281 @end defun
|
|
|
1282
|
|
|
1283 @defun widget-member widget property
|
|
|
1284 Non-nil if @var{widget} has a value (even nil) for property @var{property}.
|
|
|
1285 @end defun
|
|
|
1286
|
|
|
1287 Occasionally it can be useful to know which kind of widget you have,
|
|
|
1288 i.e. the name of the widget type you gave when the widget was created.
|
|
|
1289
|
|
|
1290 @defun widget-type widget
|
|
|
1291 Return the name of @var{widget}, a symbol.
|
|
|
1292 @end defun
|
|
|
1293
|
|
116
|
1294 Widgets can be in two states: active, which means they are modifiable by
|
|
|
1295 the user, or inactive, which means they cannot be modified by the user.
|
|
|
1296 You can query or set the state with the following code:
|
|
|
1297
|
|
|
1298 @lisp
|
|
|
1299 ;; Examine if @var{widget} is active or not.
|
|
|
1300 (if (widget-apply @var{widget} :active)
|
|
|
1301 (message "Widget is active.")
|
|
|
1302 (message "Widget is inactive.")
|
|
|
1303
|
|
|
1304 ;; Make @var{widget} inactive.
|
|
|
1305 (widget-apply @var{widget} :deactivate)
|
|
|
1306
|
|
|
1307 ;; Make @var{widget} active.
|
|
|
1308 (widget-apply @var{widget} :activate)
|
|
|
1309 @end lisp
|
|
|
1310
|
|
|
1311 A widget is inactive if itself, or any of its ancestors (found by
|
|
|
1312 following the @code{:parent} link) have been deactivated. To make sure
|
|
|
1313 a widget is really active, you must therefore activate both itself, and
|
|
|
1314 all its ancestors.
|
|
|
1315
|
|
|
1316 @lisp
|
|
|
1317 (while widget
|
|
|
1318 (widget-apply widget :activate)
|
|
|
1319 (setq widget (widget-get widget :parent)))
|
|
|
1320 @end lisp
|
|
|
1321
|
|
|
1322 You can check if a widget has been made inactive by examining the value
|
|
|
1323 of @code{:inactive} keyword. If this is non-nil, the widget itself has
|
|
|
1324 been deactivated. This is different from using the @code{:active}
|
|
|
1325 keyword, in that the later tell you if the widget @strong{or} any of its
|
|
|
1326 ancestors have been deactivated. Do not attempt to set the
|
|
|
1327 @code{:inactive} keyword directly. Use the @code{:activate}
|
|
|
1328 @code{:deactivated} keywords instead.
|
|
|
1329
|
|
|
1330
|
|
149
|
1331 @node Defining New Widgets, Widget Browser, Widget Properties, Top
|
|
98
|
1332 @comment node-name, next, previous, up
|
|
|
1333 @section Defining New Widgets
|
|
|
1334
|
|
|
1335 You can define specialized widgets with @code{define-widget}. It allows
|
|
|
1336 you to create a shorthand for more complex widgets, including specifying
|
|
|
1337 component widgets and default new default values for the keyword
|
|
|
1338 arguments.
|
|
|
1339
|
|
|
1340 @defun widget-define name class doc &rest args
|
|
|
1341 Define a new widget type named @var{name} from @code{class}.
|
|
|
1342
|
|
|
1343 @var{name} and class should both be symbols, @code{class} should be one
|
|
|
1344 of the existing widget types.
|
|
|
1345
|
|
|
1346 The third argument @var{DOC} is a documentation string for the widget.
|
|
|
1347
|
|
|
1348 After the new widget has been defined, the following two calls will
|
|
|
1349 create identical widgets:
|
|
|
1350
|
|
|
1351 @itemize @bullet
|
|
|
1352 @item
|
|
|
1353 @lisp
|
|
|
1354 (widget-create @var{name})
|
|
|
1355 @end lisp
|
|
|
1356
|
|
|
1357 @item
|
|
|
1358 @lisp
|
|
|
1359 (apply widget-create @var{class} @var{args})
|
|
|
1360 @end lisp
|
|
|
1361 @end itemize
|
|
|
1362
|
|
|
1363 @end defun
|
|
|
1364
|
|
|
1365 Using @code{widget-define} does just store the definition of the widget
|
|
|
1366 type in the @code{widget-type} property of @var{name}, which is what
|
|
|
1367 @code{widget-create} uses.
|
|
|
1368
|
|
|
1369 If you just want to specify defaults for keywords with no complex
|
|
|
1370 conversions, you can use @code{identity} as your conversion function.
|
|
|
1371
|
|
|
1372 The following additional keyword arguments are useful when defining new
|
|
|
1373 widgets:
|
|
|
1374 @table @code
|
|
|
1375 @item :convert-widget
|
|
|
1376 Function to convert a widget type before creating a widget of that
|
|
|
1377 type. It takes a widget type as an argument, and returns the converted
|
|
|
1378 widget type. When a widget is created, this function is called for the
|
|
|
1379 widget type and all the widgets parent types, most derived first.
|
|
|
1380
|
|
149
|
1381 The following predefined functions can be used here:
|
|
|
1382
|
|
|
1383 @defun widget-types-convert-widget widget
|
|
|
1384 Convert @code{:args} as widget types in @var{widget}.
|
|
|
1385 @end defun
|
|
|
1386
|
|
|
1387 @defun widget-value-convert-widget widget
|
|
|
1388 Initialize @code{:value} from @code{:args} in @var{widget}.
|
|
|
1389 @end defun
|
|
|
1390
|
|
98
|
1391 @item :value-to-internal
|
|
|
1392 Function to convert the value to the internal format. The function
|
|
|
1393 takes two arguments, a widget and an external value, and returns the
|
|
|
1394 internal value. The function is called on the present @code{:value}
|
|
|
1395 when the widget is created, and on any value set later with
|
|
|
1396 @code{widget-value-set}.
|
|
|
1397
|
|
|
1398 @item :value-to-external
|
|
|
1399 Function to convert the value to the external format. The function
|
|
|
1400 takes two arguments, a widget and an internal value, and returns the
|
|
|
1401 internal value. The function is called on the present @code{:value}
|
|
|
1402 when the widget is created, and on any value set later with
|
|
|
1403 @code{widget-value-set}.
|
|
|
1404
|
|
|
1405 @item :create
|
|
|
1406 Function to create a widget from scratch. The function takes one
|
|
|
1407 argument, a widget type, and create a widget of that type, insert it in
|
|
|
1408 the buffer, and return a widget object.
|
|
|
1409
|
|
|
1410 @item :delete
|
|
|
1411 Function to delete a widget. The function takes one argument, a widget,
|
|
|
1412 and should remove all traces of the widget from the buffer.
|
|
|
1413
|
|
|
1414 @item :value-create
|
|
|
1415 Function to expand the @samp{%v} escape in the format string. It will
|
|
|
1416 be called with the widget as its argument. Should
|
|
|
1417 insert a representation of the widgets value in the buffer.
|
|
|
1418
|
|
|
1419 @item :value-delete
|
|
|
1420 Should remove the representation of the widgets value from the buffer.
|
|
|
1421 It will be called with the widget as its argument. It doesn't have to
|
|
|
1422 remove the text, but it should release markers and delete nested widgets
|
|
|
1423 if such has been used.
|
|
|
1424
|
|
149
|
1425 The following predefined function can be used here:
|
|
|
1426
|
|
|
1427 @defun widget-children-value-delete widget
|
|
|
1428 Delete all @code{:children} and @code{:buttons} in @var{widget}.
|
|
|
1429 @end defun
|
|
|
1430
|
|
|
1431 @item :value-get
|
|
|
1432 Function to extract the value of a widget, as it is displayed in the
|
|
|
1433 buffer.
|
|
|
1434
|
|
|
1435 The following predefined function can be used here:
|
|
|
1436
|
|
|
1437 @defun widget-value-value-get widget
|
|
|
1438 Return the @code{:value} property of @var{widget}.
|
|
|
1439 @end defun
|
|
|
1440
|
|
98
|
1441 @item :format-handler
|
|
|
1442 Function to handle unknown @samp{%} escapes in the format string. It
|
|
|
1443 will be called with the widget and the escape character as arguments.
|
|
|
1444 You can set this to allow your widget to handle non-standard escapes.
|
|
|
1445
|
|
|
1446 You should end up calling @code{widget-default-format-handler} to handle
|
|
|
1447 unknown escape sequences, which will handle the @samp{%h} and any future
|
|
|
1448 escape sequences, as well as give an error for unknown escapes.
|
|
149
|
1449
|
|
|
1450 @item :action
|
|
|
1451 Function to handle user initiated events. By default, @code{:notify}
|
|
|
1452 the parent.
|
|
|
1453
|
|
|
1454 The following predefined function can be used here:
|
|
|
1455
|
|
|
1456 @defun widget-parent-action widget &optional event
|
|
|
1457 Tell @code{:parent} of @var{widget} to handle the @code{:action}.@br
|
|
|
1458 Optional @var{event} is the event that triggered the action.
|
|
|
1459 @end defun
|
|
|
1460
|
|
|
1461 @item :prompt-value
|
|
|
1462 Function to prompt for a value in the minibuffer. The function should
|
|
|
1463 take four arguments, @var{widget}, @var{prompt}, @var{value}, and
|
|
|
1464 @var{unbound} and should return a value for widget entered by the user.
|
|
|
1465 @var{prompt} is the prompt to use. @var{value} is the default value to
|
|
|
1466 use, unless @var{unbound} is non-nil in which case there are no default
|
|
|
1467 value. The function should read the value using the method most natural
|
|
|
1468 for this widget, and does not have to check that it matches.
|
|
98
|
1469 @end table
|
|
|
1470
|
|
|
1471 If you want to define a new widget from scratch, use the @code{default}
|
|
|
1472 widget as its base.
|
|
|
1473
|
|
149
|
1474 @deffn Widget default
|
|
98
|
1475 Widget used as a base for other widgets.
|
|
|
1476
|
|
|
1477 It provides most of the functionality that is referred to as ``by
|
|
|
1478 default'' in this text.
|
|
|
1479 @end deffn
|
|
|
1480
|
|
149
|
1481 @node Widget Browser, Widget Minor Mode, Defining New Widgets, Top
|
|
|
1482 @comment node-name, next, previous, up
|
|
|
1483 @section Widget Browser
|
|
|
1484
|
|
|
1485 There is a separate package to browse widgets. This is intended to help
|
|
|
1486 programmers who want to examine the content of a widget. The browser
|
|
|
1487 shows the value of each keyword, but uses links for certain keywords
|
|
|
1488 such as `:parent', which avoids printing cyclic structures.
|
|
|
1489
|
|
|
1490 @deffn Command widget-browse WIDGET
|
|
|
1491 Create a widget browser for WIDGET.
|
|
|
1492 When called interactively, prompt for WIDGET.
|
|
|
1493 @end deffn
|
|
|
1494
|
|
|
1495 @deffn Command widget-browse-other-window WIDGET
|
|
|
1496 Create a widget browser for WIDGET and show it in another window.
|
|
|
1497 When called interactively, prompt for WIDGET.
|
|
|
1498 @end deffn
|
|
|
1499
|
|
|
1500 @deffn Command widget-browse-at POS
|
|
|
1501 Create a widget browser for the widget at POS.
|
|
|
1502 When called interactively, use the position of point.
|
|
|
1503 @end deffn
|
|
|
1504
|
|
|
1505 @node Widget Minor Mode, Utilities, Widget Browser, Top
|
|
98
|
1506 @comment node-name, next, previous, up
|
|
149
|
1507 @section Widget Minor Mode
|
|
|
1508
|
|
|
1509 There is a minor mode for manipulating widgets in major modes that
|
|
|
1510 doesn't provide any support for widgets themselves. This is mostly
|
|
|
1511 intended to be useful for programmers doing experiments.
|
|
|
1512
|
|
|
1513 @deffn Command widget-minor-mode
|
|
|
1514 Togle minor mode for traversing widgets.
|
|
|
1515 With arg, turn widget mode on if and only if arg is positive.
|
|
|
1516 @end deffn
|
|
|
1517
|
|
|
1518 @defvar widget-minor-mode-keymap
|
|
|
1519 Keymap used in @code{widget-minor-mode}.
|
|
|
1520 @end defvar
|
|
|
1521
|
|
|
1522 @node Utilities, Widget Wishlist, Widget Minor Mode, Top
|
|
|
1523 @comment node-name, next, previous, up
|
|
|
1524 @section Utilities.
|
|
|
1525
|
|
|
1526 @defun widget-prompt-value widget prompt [ value unbound ]
|
|
|
1527 Prompt for a value matching @var{widget}, using @var{prompt}.@br
|
|
|
1528 The current value is assumed to be @var{value}, unless @var{unbound} is
|
|
|
1529 non-nil.@refill
|
|
|
1530 @end defun
|
|
|
1531
|
|
|
1532 @defun widget-get-sibling widget
|
|
|
1533 Get the item @var{widget} is assumed to toggle.@br
|
|
|
1534 This is only meaningful for radio buttons or checkboxes in a list.
|
|
|
1535 @end defun
|
|
|
1536
|
|
|
1537 @node Widget Wishlist, , Utilities, Top
|
|
|
1538 @comment node-name, next, previous, up
|
|
|
1539 @section Wishlist
|
|
98
|
1540
|
|
|
1541 @itemize @bullet
|
|
|
1542 @item
|
|
|
1543 It should be possible to add or remove items from a list with @kbd{C-k}
|
|
|
1544 and @kbd{C-o} (suggested by @sc{rms}).
|
|
|
1545
|
|
|
1546 @item
|
|
|
1547 The @samp{[INS]} and @samp{[DEL]} buttons should be replaced by a single
|
|
|
1548 dash (@samp{-}). The dash should be a button that, when activated, ask
|
|
|
1549 whether you want to add or delete an item (@sc{rms} wanted to git rid of
|
|
|
1550 the ugly buttons, the dash is my idea).
|
|
|
1551
|
|
|
1552 @item
|
|
|
1553 The @code{menu-choice} tag should be prettier, something like the abbreviated
|
|
|
1554 menus in Open Look.
|
|
|
1555
|
|
|
1556 @item
|
|
149
|
1557 Finish @code{:tab-order}.
|
|
136
|
1558
|
|
|
1559 @item
|
|
98
|
1560 Make indentation work with glyphs and propertional fonts.
|
|
|
1561
|
|
|
1562 @item
|
|
149
|
1563 Add commands to show overview of object and class hierarchies to the
|
|
|
1564 browser.
|
|
|
1565
|
|
|
1566 @item
|
|
|
1567 Find a way to disable mouse highlight for inactive widgets.
|
|
|
1568
|
|
|
1569 @item
|
|
|
1570 Find a way to make glyphs look inactive.
|
|
|
1571
|
|
|
1572 @item
|
|
|
1573 Add @code{property-list} widget.
|
|
|
1574
|
|
|
1575 @item
|
|
|
1576 Add @code{association-list} widget.
|
|
|
1577
|
|
|
1578 @item
|
|
|
1579 Add @code{key-binding} widget.
|
|
|
1580
|
|
|
1581 @item
|
|
|
1582 Add @code{widget} widget for editing widget specifications.
|
|
|
1583
|
|
|
1584 @item
|
|
|
1585 Find clean way to implement variable length list.
|
|
|
1586 See @code{TeX-printer-list} for an explanation.
|
|
|
1587
|
|
|
1588 @item
|
|
|
1589 @kbd{C-h} in @code{widget-prompt-value} should give type specific help.
|
|
98
|
1590
|
|
|
1591 @end itemize
|
|
|
1592
|
|
|
1593 @contents
|
|
|
1594 @bye
|
