silverstripe-cms/code/Controllers/LeftAndMainPageIconsExtension.php

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<?php
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namespace SilverStripe\CMS\Controllers;
use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\Core\ClassInfo;
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use SilverStripe\Core\Config\Config;
use SilverStripe\Core\Convert;
use SilverStripe\Core\Extension;
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use SilverStripe\View\Requirements;
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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(), CMSMain::PAGE_ICONS_ID);
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}
/**
* 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 = '';
$classes = ClassInfo::subclassesFor(SiteTree::class);
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foreach ($classes as $class) {
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$iconURL = SiteTree::singleton($class)->getPageIconURL();
if ($iconURL) {
$cssClass = Convert::raw2htmlid($class);
$selector = sprintf('.page-icon.class-%1$s, li.class-%1$s > a .jstree-pageicon', $cssClass);
$css .= sprintf('%s { background: transparent url(\'%s\') 0 0 no-repeat; }', $selector, $iconURL);
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}
}
return $css;
}
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}