mirror of
https://github.com/moparisthebest/xeps
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239 lines
10 KiB
XML
239 lines
10 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>Data Forms - Color Field Types</title>
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<abstract>This specification defines how to publish fields in data forms that take color values. Color values are best edited using a color picker dialog, rather than manual input.</abstract>
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&LEGALNOTICE;
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<number>0331</number>
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<status>Experimental</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0001</spec>
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<spec>XEP-0004</spec>
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<spec>XEP-0030</spec>
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<spec>XEP-0122</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>color-parameter</shortname>
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<author>
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<firstname>Peter</firstname>
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<surname>Waher</surname>
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<email>peter.waher@clayster.com</email>
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<jid>peter.waher@jabber.org</jid>
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<uri>http://www.linkedin.com/in/peterwaher</uri>
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</author>
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<revision>
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<version>0.2</version>
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<date>2014-03-10</date>
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<initials>pw</initials>
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<remark>
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<p>Namespace changed to urn:xmpp:xdata:color.</p>
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</remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2013-06-26</date>
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<initials>psa</initials>
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<remark>
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<p>Initial published version approved by the XMPP Council.</p>
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</remark>
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</revision>
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<revision>
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<version>0.0.2</version>
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<date>2013-06-11</date>
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<initials>pw</initials>
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<remark>
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<p>Added the ColorAlpha data type.</p>
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</remark>
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</revision>
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<revision>
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<version>0.0.1</version>
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<date>2013-05-27</date>
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<initials>pw</initials>
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<remark>
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<p>First draft.</p>
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</remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>
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Some applications require configuration of color values. Examples can be what colors to use for different situations in control applications.
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There's up to this point no good way to publish color values in a &xep0004;.
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</p>
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<p>
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Some applications provide parameters of type list-single enabling the user to choose a color from a list of colors. This only allows the user
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to select from a small amount of colors, and doesn't provide any visual feedback of the actual color chosen.
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</p>
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<p>
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Editing color values as color components or encoded strings is both impractical and unintuitive.
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</p>
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<p>
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This document proposes a method to publish color field parameters in a way that allows clients to show a color picker dialog for the parameter
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instead of forcing the user to enter an encoded color value. For clients not supporting this extensions, the color value will still be editable
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as an encoded color string.
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</p>
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<p>
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This extension also relies on &xep0122; as a fallback mechanism so clients not recognizing the color data types can handle them as
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strings with a regular expressions validating user input.
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</p>
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</section1>
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<section1 topic='Publishing a Color Field in a Data Form'>
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<p>
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The following example shows how to publish a Color Field parameter in a Data Form:
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</p>
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<example caption='Publishing a Color Field in a Data Form'>
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<![CDATA[
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<field var='color' type='text-single' label='Color:'>
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<desc>Choose a color.</desc>
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<xdv:validate xmlns:xdv='http://jabber.org/protocol/xdata-validate'
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xmlns:xdc='urn:xmpp:xdata:color'
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datatype='xdc:Color'>
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<xdv:regex>^[0-9a-fA-F]{6}$</xdv:regex>
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</xdv:validate>
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<value>9400D3</value>
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</field>]]>
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</example>
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<p>
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The color value is represented by a string consisting of six case-insensitive hexadecimal digits. The first two represent the red component,
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the next two the green component and the last two the blue component.
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</p>
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<p>
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If the client does not support XEP-0122 (Data Form Validation), it will interpret the field as a normal <strong>text-single</strong> field. It is
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up to the server to validate user input. But the user can still enter a color.
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</p>
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<p>
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A client that supports XEP-0122 (Data Form Validation), but not this extension, will not understand the data type <strong>xdc:Color</strong>.
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It will thus default to a normal string (xs:string). However, the client still supports the <strong>regex</strong> validation rule,
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making sure the client only allows user input that forms valid color values.
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</p>
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<p>
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A client supporting this specification will recognize the <strong>xdc:Color</strong> data type, and choose to show a color picker dialog instead
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of a string input field. In this case, the regular expression in the validation statement will not be used, as the string is not edited
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directly by the user. However, it is still available implicitly in the xdc:Color data type.
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</p>
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</section1>
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<section1 topic='Publishing a Color Field with Alpha channel in a Data Form'>
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<p>
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The following example shows how to publish a Color Field parameter including an Alpha channel in a Data Form:
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</p>
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<example caption='Publishing a Color Field in a Data Form'>
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<![CDATA[
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<field var='color' type='text-single' label='Color:'>
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<desc>Choose a color.</desc>
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<xdv:validate xmlns:xdv='http://jabber.org/protocol/xdata-validate'
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xmlns:xdc='urn:xmpp:xdata:color'
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datatype='xdc:ColorAlpha'>
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<xdv:regex>^[0-9a-fA-F]{8}$</xdv:regex>
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</xdv:validate>
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<value>9400D3C0</value>
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</field>]]>
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</example>
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<p>
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The color value is represented by a string consisting of eight case-insensitive hexadecimal digits. The first two represent the red component,
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the next two the green component and the last two the blue component. The last two represents the alpha channel, where 00 means completely
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transparent and FF means completely opaque.
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</p>
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<p>
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As with the xdc:Color type defined above, if the client does not support XEP-0122 (Data Form Validation), it will interpret the field as a
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normal <strong>text-single</strong> field. It is up to the server to validate user input. But the user can still enter a color.
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</p>
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<p>
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A client that supports XEP-0122 (Data Form Validation), but not this extension, will not understand the data type <strong>xdc:ColorAlpha</strong>.
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It will thus default to a normal string (xs:string). However, the client still supports the <strong>regex</strong> validation rule,
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making sure the client only allows user input that forms valid color values.
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</p>
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<p>
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A client supporting this specification will recognize the <strong>xdc:ColorAlpha</strong> data type, and choose to show a color picker dialog instead
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of a string input field. In this case, the regular expression in the validation statement will not be used, as the string is not edited
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directly by the user. However, it is still available implicitly in the xdc:ColorAlpha data type.
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</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<section2 topic='Color datatype prefix: xdc'>
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<p>
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As defined in <link url='http://xmpp.org/extensions/xep-0122.html#registar-reg-prefixes'>XEP-0122 §7.2.1</link>, following is the submission
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to the XMPP Registrar of a new datatype prefix for use in data forms:
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</p>
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<code caption='Color datatype prefix: xdc'>
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<![CDATA[
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<datatype-prefix>
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<prefix>xdc</prefix>
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<desc>defines the Color data type</desc>
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<doc>http://xmpp.org/extensions/xep-0331.html</doc>
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</datatype-prefix>]]>
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</code>
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</section2>
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<section2 topic='Color datatype'>
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<p>
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As defined in <link url='http://xmpp.org/extensions/xep-0122.html#registar-reg-datatypes'>XEP-0122 §7.2.2</link>, following is the submission
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to the XMPP Registrar of a new datatype representing color values for use in data forms:
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</p>
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<code caption='Color datatype'>
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<![CDATA[
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<datatype>
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<name>xdc:Color</name>
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<desc>a color value represented as an RGB value, expressed using 6 hexadecimal digits, with each pair of
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the hexadecimal digits representing the values of the Red, Green and Blue channel, respectively</desc>
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<methods>basic regex</methods>
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<min>N/A</min>
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<max>N/A</max>
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</datatype>]]>
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</code>
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</section2>
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<section2 topic='ColorAlpha datatype'>
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<p>
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As defined in <link url='http://xmpp.org/extensions/xep-0122.html#registar-reg-datatypes'>XEP-0122 §7.2.2</link>, following is the submission
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to the XMPP Registrar of a new datatype representing color values with alpha channel for use in data forms:
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</p>
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<code caption='ColorAlpha datatype'>
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<![CDATA[
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<datatype>
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<name>xdc:ColorAlpha</name>
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<desc>a color value represented as an RGBA value, expressed using 8 hexadecimal digits, with each pair of
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the hexadecimal digits representing the values of the Red, Green, Blue and Alpha channel, respectively</desc>
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<methods>basic regex</methods>
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<min>N/A</min>
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<max>N/A</max>
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</datatype>]]>
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</code>
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</section2>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<code>
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<![CDATA[
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<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='urn:xmpp:xdata:color'
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xmlns='urn:xmpp:xdata:color'
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elementFormDefault='qualified'>
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<xs:simpleType name='Color'>
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<xs:restriction base='xs:string'>
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<xs:pattern value='^[0-9a-fA-F]{6}$'/>
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</xs:restriction>
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</xs:simpleType>
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<xs:simpleType name='ColorAlpha'>
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<xs:restriction base='xs:string'>
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<xs:pattern value='^[0-9a-fA-F]{8}$'/>
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</xs:restriction>
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</xs:simpleType>
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</xs:schema>]]>
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</code>
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</section1>
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<section1 topic='Acknowledgements' anchor='ack'>
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<p>Thanks to Karin Forsell for all valuable feedback.</p>
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</section1>
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</xep>
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