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0.0.2

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Peter Saint-Andre 2013-06-12 11:39:40 -06:00
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inbox/color-parameter.xml
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@ -6,7 +6,7 @@
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
<xep>
<header>
<title>Data Forms - Color Field Type</title>
<title>Data Forms - Color Field Types</title>
<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>
<legal>
<copyright>This XMPP Extension Protocol is copyright (c) 1999 - 2013 by the XMPP Standards Foundation (XSF).</copyright>
@ -39,7 +39,15 @@
<jid>peter.waher@jabber.org</jid>
<uri>http://se.linkedin.com/pub/peter-waher/1a/71b/a29/</uri>
</author>
<revision>
<revision>
<version>0.0.2</version>
<date>2013-06-11</date>
<initials>pw</initials>
<remark>
<p>Added the ColorAlpha data type.</p>
</remark>
</revision>
<revision>
<version>0.0.1</version>
<date>2013-05-27</date>
<initials>pw</initials>
@ -66,8 +74,8 @@
as an encoded color string.
</p>
<p>
This extension also relies on &xep0122; as a fall-back mechanism so clients not recognizing the color data type can handle it as a
string with a regular expression validating user input.
This extension also relies on &xep0122; as a fallback mechanism so clients not recognizing the color data types can handle them as
strings with a regular expressions validating user input.
</p>
</section1>
<section1 topic='Publishing a Color Field in a Data Form'>
@ -84,8 +92,7 @@
<xdv:regex>^[0-9a-fA-F]{6}$</xdv:regex>
</xdv:validate>
<value>9400D3</value>
</field>
]]>
</field>]]>
</example>
<p>
The color value is represented by a string consisting of six case-insensitive hexadecimal digits. The first two represent the red component,
@ -106,6 +113,42 @@
directly by the user. However, it is still available implicitly in the xdc:Color data type.
</p>
</section1>
<section1 topic='Publishing a Color Field with Alpha channel in a Data Form'>
<p>
The following example shows how to publish a Color Field parameter including an Alpha channel in a Data Form:
</p>
<example caption='Publishing a Color Field in a Data Form'>
<![CDATA[
<field var='color' type='text-single' label='Color:'>
<desc>Choose a color.</desc>
<xdv:validate xmlns:xdv='http://jabber.org/protocol/xdata-validate'
xmlns:xdc='http://jabber.org/protocol/xdata-color'
datatype='xdc:ColorAlpha'>
<xdv:regex>^[0-9a-fA-F]{8}$</xdv:regex>
</xdv:validate>
<value>9400D3C0</value>
</field>]]>
</example>
<p>
The color value is represented by a string consisting of eight case-insensitive hexadecimal digits. The first two represent the red component,
the next two the green component and the last two the blue component. The last two represents the alpha channel, where 00 means completely
transparent and FF means completely opaque.
</p>
<p>
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
normal <strong>text-single</strong> field. It is up to the server to validate user input. But the user can still enter a color.
</p>
<p>
A client that supports XEP-0122 (Data Form Validation), but not this extension, will not understand the data type <strong>xdc:ColorAlpha</strong>.
It will thus default to a normal string (xs:string). However, the client still supports the <strong>regex</strong> validation rule,
making sure the client only allows user input that forms valid color values.
</p>
<p>
A client supporting this specification will recognize the <strong>xdc:ColorAlpha</strong> data type, and choose to show a color picker dialog instead
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
directly by the user. However, it is still available implicitly in the xdc:ColorAlpha data type.
</p>
</section1>
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
<section2 topic='Color datatype prefix: xdc'>
<p>
@ -116,8 +159,8 @@
<![CDATA[
<datatype-prefix>
<prefix>xdc</prefix>
<desc>Defines the Color data type.</desc>
<doc>xep-0000-ColorParameter.html</doc>
<desc>defines the Color data type</desc>
<doc>color-parameter.html</doc>
</datatype-prefix>]]>
</code>
</section2>
@ -130,7 +173,25 @@
<![CDATA[
<datatype>
<name>xdc:Color</name>
<desc>A color value represented as an RGB value.</desc>
<desc>a color value represented as an RGB value, expressed using 6 hexadecimal digits, with each pair of
the hexadecimal digits representing the values of the Red, Green and Blue channel, respectively</desc>
<methods>basic regex</methods>
<min>N/A</min>
<max>N/A</max>
</datatype>]]>
</code>
</section2>
<section2 topic='ColorAlpha datatype'>
<p>
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
to the XMPP Registrar of a new datatype representing color values with alpha channel for use in data forms:
</p>
<code caption='ColorAlpha datatype'>
<![CDATA[
<datatype>
<name>xdc:ColorAlpha</name>
<desc>a color value represented as an RGBA value, expressed using 8 hexadecimal digits, with each pair of
the hexadecimal digits representing the values of the Red, Green, Blue and Alpha channel, respectively</desc>
<methods>basic regex</methods>
<min>N/A</min>
<max>N/A</max>
@ -154,7 +215,16 @@
</xs:restriction>
</xs:simpleType>
<xs:simpleType name='ColorAlpha'>
<xs:restriction base='xs:string'>
<xs:pattern value='^[0-9a-fA-F]{8}$'/>
</xs:restriction>
</xs:simpleType>
</xs:schema>]]>
</code>
</section1>
<section1 topic='Acknowledgements' anchor='ack'>
<p>Thanks to Karin Forsell for all valuable feedback.</p>
</section1>
</xep>