SimpleSpriteHandler.php

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<?php
namespace TYPO3\CMS\Backend\Sprite;

class SimpleSpriteHandler extends \TYPO3\CMS\Backend\Sprite\AbstractSpriteHandler {

    protected $styleSheetTemplateExtIcons = '
.t3-icon-###NAME### {
    background-position: 0px 0px !important;
    background-image: url(\'###IMAGE###\') !important;
    background-size: contain;
}
    ';

    public function generate() {
        // Generate IconData for single Icons registered
        $this->buildCssAndRegisterIcons();
        parent::generate();
    }

    protected function buildCssAndRegisterIcons() {
        // Backpath from the stylesheet file ($cssTcaFile) to PATH_site dir
        // in order to set the background-image URL paths correct
        $iconPath = '../../' . TYPO3_mainDir;
        $iconsToProcess = array_merge((array) $GLOBALS['TBE_STYLES']['spritemanager']['singleIcons'], $this->collectTcaSpriteIcons());
        foreach ($iconsToProcess as $iconName => $iconFile) {
            $css = str_replace('###NAME###', str_replace(array('extensions-', 'tcarecords-'), array('', ''), $iconName), $this->styleSheetTemplateExtIcons);
            $css = str_replace('###IMAGE###', \TYPO3\CMS\Core\Utility\GeneralUtility::resolveBackPath($iconPath . $iconFile), $css);
            $this->iconNames[] = $iconName;
            $this->styleSheetData .= $css;
        }
    }

}