diff options
| -rw-r--r-- | man/widget.texi | 129 |
1 files changed, 78 insertions, 51 deletions
diff --git a/man/widget.texi b/man/widget.texi index e273d253fb..39b62ff343 100644 --- a/man/widget.texi +++ b/man/widget.texi @@ -480,11 +480,11 @@ when not on a button. By default this is @code{global-map}. @comment node-name, next, previous, up @section Basic Types -The syntax of a type specification is given below: +This is the general syntax of a type specification: @example -NAME ::= (NAME [KEYWORD ARGUMENT]... ARGS) - | NAME +@var{name} ::= (@var{name} [@var{keyword} @var{argument}]... @var{args}) + | @var{name} @end example Where, @var{name} is a widget name, @var{keyword} is the name of a @@ -724,7 +724,7 @@ If non-@code{nil}, allow glyphs to appear on displays where they are supported. Syntax: @example -TYPE ::= (link [KEYWORD ARGUMENT]... [ VALUE ]) +@var{type} ::= (link [@var{keyword} @var{argument}]... [ @var{value} ]) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -749,7 +749,7 @@ String to suffix links. Syntax: @example -TYPE ::= (url-link [KEYWORD ARGUMENT]... URL) +@var{type} ::= (url-link [@var{keyword} @var{argument}]... @var{url}) @end example @findex browse-url-browser-function@r{, and @code{url-link} widget} @@ -764,7 +764,7 @@ When this link is invoked, the @acronym{WWW} browser specified by Syntax: @example -TYPE ::= (info-link [KEYWORD ARGUMENT]... ADDRESS) +@var{type} ::= (info-link [@var{keyword} @var{argument}]... @var{address}) @end example When this link is invoked, the built-in Info reader is started on @@ -778,7 +778,7 @@ When this link is invoked, the built-in Info reader is started on Syntax: @example -TYPE ::= (push-button [KEYWORD ARGUMENT]... [ VALUE ]) +@var{type} ::= (push-button [@var{keyword} @var{argument}]... [ @var{value} ]) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -803,7 +803,7 @@ String to suffix push buttons. Syntax: @example -TYPE ::= (editable-field [KEYWORD ARGUMENT]... [ VALUE ]) +@var{type} ::= (editable-field [@var{keyword} @var{argument}]... [ @var{value} ]) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -863,7 +863,7 @@ does not rebind the @key{RET} key. Syntax: @example -TYPE ::= (menu-choice [KEYWORD ARGUMENT]... TYPE ... ) +@var{type} ::= (menu-choice [@var{keyword} @var{argument}]... @var{type} ... ) @end example The @var{type} argument represents each possible choice. The widget's @@ -904,13 +904,13 @@ The list of types. Syntax: @example -TYPE ::= (radio-button-choice [KEYWORD ARGUMENT]... TYPE ... ) +@var{type} ::= (radio-button-choice [@var{keyword} @var{argument}]... @var{type} ... ) @end example -The @var{type} argument represents each possible choice. The widget's -value will be that of the chosen @var{type} argument. This widget will -match any value matching at least one of the specified @var{type} -arguments. +The component types specify the choices, with one radio button for +each. The widget's value will be that of the chosen @var{type} +argument. This widget matches any value that matching at least one of +the specified @var{type} arguments. The following extra properties are recognized. @@ -971,7 +971,7 @@ you call @code{widget-delete}. Syntax: @example -ITEM ::= (item [KEYWORD ARGUMENT]... VALUE) +@var{item} ::= (item [@var{keyword} @var{argument}]... @var{value}) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -986,7 +986,7 @@ buffer. This widget will only match the specified value. Syntax: @example -ITEM ::= (choice-item [KEYWORD ARGUMENT]... VALUE) +@var{item} ::= (choice-item [@var{keyword} @var{argument}]... @var{value}) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -1003,7 +1003,7 @@ the specified value. Syntax: @example -TYPE ::= (toggle [KEYWORD ARGUMENT]...) +@var{type} ::= (toggle [@var{keyword} @var{argument}]...) @end example The widget has two possible states, @samp{on} and @samp{off}, which @@ -1039,7 +1039,7 @@ This widget has two possible states, @samp{selected} and Syntax: @example -TYPE ::= (checkbox [KEYWORD ARGUMENT]...) +@var{type} ::= (checkbox [@var{keyword} @var{argument}]...) @end example @node checklist, editable-list, checkbox, Basic Types @@ -1050,7 +1050,7 @@ TYPE ::= (checkbox [KEYWORD ARGUMENT]...) Syntax: @example -TYPE ::= (checklist [KEYWORD ARGUMENT]... TYPE ... ) +@var{type} ::= (checklist [@var{keyword} @var{argument}]... @var{type} ... ) @end example The @var{type} arguments represent each checklist item. The widget's @@ -1108,7 +1108,7 @@ The list of types. Syntax: @example -TYPE ::= (editable-list [KEYWORD ARGUMENT]... TYPE) +@var{type} ::= (editable-list [@var{keyword} @var{argument}]... @var{type}) @end example The value is a list, where each member represents one widget of type @@ -1168,7 +1168,7 @@ This widget simply group other widgets together. Syntax: @example -TYPE ::= (group [KEYWORD ARGUMENT]... TYPE...) +@var{type} ::= (group [@var{keyword} @var{argument}]... @var{type}...) @end example The value is a list, with one member for each @var{type}. @@ -1201,7 +1201,7 @@ of the composite widgets. The syntax for the @code{const} widget is: @example -TYPE ::= (const [KEYWORD ARGUMENT]... [ VALUE ]) +@var{type} ::= (const [@var{keyword} @var{argument}]... [ @var{value} ]) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -1237,7 +1237,7 @@ user to edit it inline in the buffer. The syntax for the @code{sexp} widget is: @example -TYPE ::= (sexp [KEYWORD ARGUMENT]... [ VALUE ]) +@var{type} ::= (sexp [@var{keyword} @var{argument}]... [ @var{value} ]) @end example @deffn Widget sexp @@ -1261,7 +1261,7 @@ following widgets. The syntax for all the atoms are: @example -TYPE ::= (NAME [KEYWORD ARGUMENT]... [ VALUE ]) +@var{type} ::= (@var{construct} [@var{keyword} @var{argument}]... [ @var{value} ]) @end example The @var{value}, if present, is used to initialize the @code{:value} @@ -1331,10 +1331,10 @@ either @code{nil} meaning false, or non-@code{nil} meaning true. @subsection Composite Sexp Widgets @cindex composite sexp widgets -The syntax for the composite widget is: +The syntax for the composite widget construct is: @example -TYPE ::= (NAME [KEYWORD ARGUMENT]... COMPONENT...) +@var{type} ::= (@var{construct} [@var{keyword} @var{argument}]... @var{component}...) @end example @noindent @@ -1342,19 +1342,43 @@ where each @var{component} must be a widget type. Each component widget will be displayed in the buffer, and will be editable by the user. @deffn Widget cons -The value of a @code{cons} widget is a cons-cell where the @sc{car} is -the value of the first component and the @sc{cdr} is the value of the -second component. There must be exactly two components. +The value of a @code{cons} widget must be a cons-cell whose @sc{car} +and @sc{cdr} have two specified types. It uses this syntax: + +@example +@var{type} ::= (cons [@var{keyword} @var{argument}]... @var{car-type} @var{cdr-type}) +@end example +@end deffn + +@deffn Widget choice +The @code{choice} widget specifies a set of values that match any one +of a fixed set of types. Its syntax is as follows: + +@example +@var{type} ::= (choice [@var{keyword} @var{argument}]... @var{type} ... ) +@end example + +The value of a @code{choice} widget can be anything that matches any of the +@var{types}. @end deffn @deffn Widget list -The value of a @code{list} widget is a list containing the value of -each of its components. +The value of a @code{list} widget must be a list whose element types +match the specified component types: + +@example +@var{type} ::= (list [@var{keyword} @var{argument}]... @var{component-type}...) +@end example + +Thus, @code{(list string number)} matches lists of two elements, +the first being a string and the second being a number. @end deffn @deffn Widget vector -The value of a @code{vector} widget is a vector containing the value of -each of its component. +The @code{vector} widget is like the @code{list} widget but matches +vectors instead of lists. Thus, @code{(vector string number)} matches +vectors of two elements, the first being a string and the second being +a number. @end deffn The above suffice for specifying fixed size lists and vectors. To get @@ -1363,7 +1387,7 @@ variable length lists and vectors, you can use a @code{choice}, keyword. If any component of a composite widget has the @code{:inline} keyword set, its value must be a list which will then be spliced into the composite. For example, to specify a list whose first element must -be a file name, and whose remaining arguments should either be the +be a file name, and whose remaining elements should either be the symbol @code{t} or two files, you can use the following widget specification: @@ -1376,29 +1400,32 @@ specification: @end example The value of a widget of this type will either have the form -@code{(file t)} or @code{(file string string)}. +@code{(file t)} or @code{(file @var{string} @var{string})}. -This concept of inline is probably hard to understand. It was certainly -hard to implement, so instead of confusing you more by trying to explain -it here, I'll just suggest you meditate over it for a while. - -@deffn Widget choice -Allows you to edit a sexp which may have one of a fixed set of types. -It is currently implemented with the @code{choice-menu} basic widget, -and has a similar syntax. -@end deffn +This concept of @code{:inline} may be hard to understand. It was +certainly hard to implement, so instead of confusing you more by +trying to explain it here, I'll just suggest you meditate over it for +a while. @deffn Widget set -Allows you to specify a type which must be a list whose elements all -belong to the given set. The elements of the list are not significant. -This is implemented on top of the @code{checklist} basic widget, and has -a similar syntax. +Specifies a type whose values are the lists whose elements all belong +to a given set. The order of elements of the list is not significant. +Here's the syntax: + +@example +@var{type} ::= (set [@var{keyword} @var{argument}]... @var{permitted-element} ... ) +@end example + +Use @code{const} to specify each permitted element, like this: +@code{(set (const a) (const b))}. @end deffn @deffn Widget repeat -Allows you to specify a variable length list whose members are all of -the same type. Implemented on top of the @code{editable-list} basic -widget, and has a similar syntax. +Specifies a list of any number of elements that fit a certain type. + +@example +@var{type} ::= (repeat [@var{keyword} @var{argument}]... @var{type}) +@end example @end deffn @node Widget Properties, Defining New Widgets, Sexp Types, Top |