silverstripe-cms/code/Controllers/LeftAndMainPageIconsExtension.php

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<?php
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namespace SilverStripe\CMS\Controllers;
use SilverStripe\View\Requirements;
use SilverStripe\Core\ClassInfo;
use SilverStripe\Control\Director;
use SilverStripe\Core\Extension;
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/**
* Extension to include custom page icons
*/
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class LeftAndMainPageIconsExtension extends Extension
{
public function init()
{
Requirements::customCSS($this->generatePageIconsCss());
}
/**
* Include CSS for page icons. We're not using the JSTree 'types' option
* because it causes too much performance overhead just to add some icons.
*
* @return string CSS
*/
public function generatePageIconsCss()
{
$css = '';
$classes = ClassInfo::subclassesFor('SilverStripe\\CMS\\Model\\SiteTree');
foreach ($classes as $class) {
$obj = singleton($class);
$iconSpec = $obj->config()->get('icon');
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if (!$iconSpec) {
continue;
}
// Legacy support: We no longer need separate icon definitions for folders etc.
$iconFile = (is_array($iconSpec)) ? $iconSpec[0] : $iconSpec;
// Legacy support: Add file extension if none exists
if (!pathinfo($iconFile, PATHINFO_EXTENSION)) {
$iconFile .= '-file.gif';
}
$selector = ".page-icon.class-$class, li.class-$class > a .jstree-pageicon";
if (Director::fileExists($iconFile)) {
$css .= "$selector { background: transparent url('$iconFile') 0 0 no-repeat; }\n";
} else {
// Support for more sophisticated rules, e.g. sprited icons
$css .= "$selector { $iconFile }\n";
}
}
return $css;
}
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}