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doc/devel/scheme/utils/utils-preferences.en.tm

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<TeXmacs|1.0.7.17>
<style|tmdoc>
<\body>
<tmdoc-title|User preferences>
Preferences are used to store any information you need to keep across
different runs of <TeXmacs>, like window position and size, active menu
bars, etc. Internally they are stored in the users home directory as a
<scheme> list of items like <scm|("name" value)> which therefore has in
principle no structure. However, a good practice to avoid conflicts is to
prefix your options by the name of the plugin or module you are creating,
like in <scm|"gui:help-window-position">.
The first step in defining a new preference is adding it with
<scm|define-preferences> and assigning a call-back function to handle
changes in the preference. This is important for instance in menus, where a
click on an item simply sets some preference to some value and it's up to
the call-back to actually take the necessary actions.
\;
<\explain>
<scm|(define-preferences <scm-arg|list>)><explain-synopsis|define new
preferences with defaults and call-backs>
<|explain>
Each element of <scm-arg|list> is of the form <scm|("somename" value
notify-procedure)> where <scm|notify-procedure> is a procedure taking two
arguments like this:
<scm|(define (notify-procedure property-name value) (do-things))>
<\folded-documentation>
Example
<|folded-documentation>
<\session|scheme|default>
<\input|Scheme] >
(define (notify-test pref value)
\ \ (display* "Hey! " pref " changed to " value)(newline))
</input>
<\input|Scheme] >
(define-preferences ("test:pref" #f notify-test))
</input>
<\unfolded-io|Scheme] >
(get-preference "test:pref")
<|unfolded-io>
#f
</unfolded-io>
<\input|Scheme] >
(set-preference "test:pref" #t)
</input>
<\input|Scheme] >
\;
</input>
</session>
</folded-documentation>
</explain>
<\explain>
<scm|(set-preference <scm-arg|name> <scm-arg|value>)><explain-synopsis|set
user preference>
<|explain>
Save preference <scm|name> with value <scm|value>. Then call the
call-back associated to this preference, as defined in
<scm|define-preferences>.
</explain>
<\explain>
<scm|(append-preference <scm-arg|name>
<scm-arg|value>)><explain-synopsis|appends a value to the list for a
preference>
<|explain>
This convenience function appends <scm|value> to the list of values of
preference <scm|name>, or creates a list with one element in case the
preference didn't exist. The call-back associated to this preference, as
defined in <scm|define-preferences> is called once the modification is
done.
</explain>
<\explain>
<scm|(reset-preference <scm-arg|name>)><explain-synopsis|delete user
preference>
<|explain>
Deletes preference <scm|name> from the user preferences.
</explain>
<\explain>
<scm|(get-preference <scm-arg|name>)><explain-synopsis|get user
preference>
<|explain>
Returns the value of preference <scm|name>. If the preference is not
defined the string <scm|"default"> is returned.
</explain>
<tmdoc-copyright|2012|>
<tmdoc-license|Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.1
or any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section entitled "GNU Free
Documentation License".>
</body>
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<associate|language|english>
</collection>
</initial>