SpriteBuildingHandler.php

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

use TYPO3\CMS\Core\Utility\GeneralUtility;

class SpriteBuildingHandler extends AbstractSpriteHandler {

    protected $generatorInstance = NULL;

    public function generate() {
        $this->generatorInstance = GeneralUtility::makeInstance('TYPO3\\CMS\\Backend\\Sprite\\SpriteGenerator', 'GeneratorHandler');
        $this->generatorInstance
            ->setOmitSpriteNameInIconName(TRUE)
            ->setIncludeTimestampInCSS(TRUE)
            ->setSpriteFolder(SpriteManager::$tempPath)
            ->setCSSFolder(SpriteManager::$tempPath);
        $iconsToProcess = array_merge((array) $GLOBALS['TBE_STYLES']['spritemanager']['singleIcons'], $this->collectTcaSpriteIcons());
        foreach ($iconsToProcess as $iconName => $iconFile) {
            $iconsToProcess[$iconName] = GeneralUtility::resolveBackPath('typo3/' . $iconFile);
        }
        $generatorResponse = $this->generatorInstance->generateSpriteFromArray($iconsToProcess);
        $this->iconNames = array_merge($this->iconNames, $generatorResponse['iconNames']);
        parent::generate();
    }

}