How does \Magento\Framework\View\Layout::getBlockSingleton() work?

dmitry_fedyuk · November 17, 2015, 5:41am

magento/magento2/blob/2335247d4ae2dc1e0728ee73022b0a244ccd7f4c/app/code/Magento/Config/Block/System/Config/Form.php#L319


if (array_key_exists($path, $this->_configData)) {
    $data = $this->_configData[$path];
    $inherit = false;
} elseif ($field->getConfigPath() !== null) {
    $data = $this->getConfigValue($field->getConfigPath());
} else {
    $data = $this->getConfigValue($path);
}
$fieldRendererClass = $field->getFrontendModel();
if ($fieldRendererClass) {
    $fieldRenderer = $this->_layout->getBlockSingleton($fieldRendererClass);
} else {
    $fieldRenderer = $this->_fieldRenderer;
}


$fieldRenderer->setForm($this);
$fieldRenderer->setConfigData($this->_configData);


$elementName = $this->_generateElementName($field->getPath(), $fieldPrefix);
$elementId = $this->_generateElementId($field->getPath($fieldPrefix));

github.com

magento/magento2/blob/2335247d4ae2dc1e0728ee73022b0a244ccd7f4c/lib/internal/Magento/Framework/View/Layout.php#L973


 * @throws \Magento\Framework\Exception\LocalizedException
 */
public function getBlockSingleton($type)
{
    if (empty($type)) {
        throw new \Magento\Framework\Exception\LocalizedException(
            new \Magento\Framework\Phrase('Invalid block type')
        );
    }
    if (!isset($this->sharedBlocks[$type])) {
        $this->sharedBlocks[$type] = $this->createBlock($type);
    }
    return $this->sharedBlocks[$type];
}


/**
 * @param string $namespace
 * @param string $staticType
 * @param string $dynamicType
 * @param string $type
 * @param string $template

github.com

magento/magento2/blob/2335247d4ae2dc1e0728ee73022b0a244ccd7f4c/lib/internal/Magento/Framework/View/Layout.php#L743


 *
 * @param string $type
 * @param string $name
 * @param array $arguments
 * @return \Magento\Framework\View\Element\AbstractBlock
 */
public function createBlock($type, $name = '', array $arguments = [])
{
    $this->build();
    $name = $this->structure->createStructuralElement($name, Element::TYPE_BLOCK, $type);
    $block = $this->_createBlock($type, $name, $arguments);
    $block->setLayout($this);
    return $block;
}


/**
 * Create block and add to layout
 *
 * @param string $type
 * @param string $name
 * @param array $arguments

See How does \Magento\Framework\View\Layout::createBlock() work?