FYI, I actually do what Marius suggested me.
eg:
.skin-flamingo .suggest {
  /* Properties specific to Flamingo */
}"
Thanks,
Louis-Marie
2014-03-19 11:11 GMT+01:00 Marius Dumitru Florea <
mariusdumitru.florea(a)xwiki.com>gt;:
  If an UI component wants to be displayed differently
based on the
 current skin then I suggest doing this:
 * Each skin can set a specific CSS class name (e.g. the skin name) on
 the BODY element to let the others know what is the current skin:
 <body id="body" class="wiki-playground space-Main viewbody hideleft
 colibri">
 * UI components can then have specific CSS rules for each skin:
 .suggest {
   /* Properties common for all skins */
 }
 .colibri .suggest {
   /* Properties specific to Colibri */
 }
 .flamingo .suggest {
   /* Properties specific to Flamingo */
 }
 * If there are not that many skin dependant rules then they can be put
 in the same CSS file
 /resources/uicomponents/suggest/suggest.css
 * Otherwise, if there are many skin dependant rules (which shouldn't
 happen very often) then the UI component can have 3 stylesheets
 /resources/uicomponents/suggest/suggest.css
 /resources/uicomponents/suggest/suggest-colibri.css
 /resources/uicomponents/suggest/suggest-flamingo.css
 In this case, each skin must load the right stylesheets. javascript.vm
 and stylesheets.vm could load common resources and also include a
 Velocity template that is skin dependent and that loads skin dependant
 resources. suggest.css would be loaded by javascript.vm /
 stylesheets.vm while suggest-colibri.css and suggest-flamingo.css
 would be loaded by the skin dependant vm.
 In any case, all resources (JavaScript, CSS, images, fonts, etc.)
 related to an UI components should be grouped together.
 Hope this helps,
 Marius
 On Tue, Mar 18, 2014 at 7:57 PM, Guillaume "Louis-Marie" Delhumeau
 <gdelhumeau(a)xwiki.com> wrote:
  Hi guys,
 When a user create a new skin, she might have to change the CSS classes
 provided by some UI components. But she cannot simply override the class 
 in
  her own style.css because uicomponents css are
currently called after the
 skin in the HTML page.
 To fix it, in Flamingo, I currently copy the uicomponents css code into 
 my
  style.css, and then modify it. Thanks to LESS, I
am able to split my big
 CSS file into several LESS files, so the code still looks good. Then, I
 remove every calls to $xwiki.ssfx.use('uicomponents/...') in my 
 templates.
 But it might not be a good solution to have uicomponents splitted in
 different locations like this.
 What is your opinion about this?
 Thanks,
 Louis-Marie
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