[richfaces-issues] [JBoss JIRA] (RF-12011) Gradient configuration in ecss

[Dupont Dupont (JIRA)]

    [ https://issues.jboss.org/browse/RF-12011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671592#comment-12671592 ] 

Dupont Dupont commented on RF-12011:
------------------------------------

Please note if we want to use this feature in RF-11994 (to allow automatic xcss to ecss migration for custom grandients), we'll need to allow skin parameters as classname of gradients.

Sample xcss : 

{code:xml}
<u:selector name="body .blocAuthentificationInterieure">
  <u:style name="background-image">
    <f:resource f:key="SampleGradient">
      <f:attribute name="gradientHeight" value="100px"/>
      <f:attribute name="height" value="150px"/>
      <f:attribute name="gradientColor" skin="blocConnexionInterieureBackgroundColor"/>
    </f:resource>
  </u:style>
  <u:style name="background-repeat" value="repeat"/>
  <u:style name="background-position" value="0 50%"/>
</u:selector>
{code}
                
> Gradient configuration in ecss
> ------------------------------
>
>                 Key: RF-12011
>                 URL: https://issues.jboss.org/browse/RF-12011
>             Project: RichFaces
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>            Reporter: Dupont Dupont
>
> For the moment, gradients are :
> # configured in resource-mappings.properties (i.e. https://github.com/richfaces/components/blob/develop/input/ui/src/main/resources/META-INF/richfaces/resource-mappings.properties)
> {noformat} 
> org.richfaces.images\:autocompleteButtonGradient.png=org.richfaces.renderkit.html.images.AutocompleteGradient\
>     {topColorParam=headerGradientColor ,bottomColorParam=headerBackgroundColor}
> {noformat} 
> # and then used in ecss files (i.e. https://github.com/richfaces/components/blob/develop/input/ui/src/main/resources/META-INF/resources/org.richfaces/Autocomplete.ecss).
> {noformat} 
> background-image: "url(#{resource['org.richfaces.images:autocompleteButtonGradient.png']})";
> {noformat} 
> A simpler solution could be allowing gradient configuration directly in the ecss file, e.g. 
> {noformat} 
> background-image:"url(#{resource['org.richfaces.dynamic:org.richfaces.renderkit.html.images.AutocompleteGradient?topColorParam=headerGradientColor&bottomColorParam=headerBackgroundColor']})";
> {noformat} 
> org.richfaces.dynamic being a special library name telling Richfaces to instantiate AutocompleteGradient and configure it on the fly.
> This would enable to get rid of resource-mappings.properties for simple use cases.
> N.B. : a control must be implemented to control which classes can be dynamically instantiated (i.e. only allow classes implementing Java2DUserResource).

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