How is a layout built?

dmitry_fedyuk · April 6, 2016, 1:27am

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Page/Config.php#L180-L189


/**
 * Build page config from page configurations
 * @return void
 */
protected function build()
{
    if (!empty($this->builder)) {
        $this->builder->build();
    }
}

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Layout/Builder.php#L54-L63


/**
 * Build layout structure
 *
 * @return \Magento\Framework\View\LayoutInterface
 */
public function build()
{
    if (!$this->isBuilt) {
        $this->isBuilt = true;
        $this->loadLayoutUpdates();

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Layout/Builder.php#L85-L86


/* load layout updates by specified handles */
$this->layout->getUpdate()->load();

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Model/Layout/Merge.php#L433-L435


foreach ($this->getHandles() as $handle) {
    $this->_merge($handle);
}

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Model/Layout/Merge.php#L258-L266


/**
 * Get handle names array
 *
 * @return array
 */
public function getHandles()
{
    return array_keys($this->handles);
}

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Model/Layout/Merge.php#L491-L501


/**
 * Merge layout update by handle
 *
 * @param string $handle
 * @return $this
 */
protected function _merge($handle)
{
    if (!isset($this->allHandles[$handle])) {
        $this->allHandles[$handle] = $this->handleProcessing;
        $this->_fetchPackageLayoutUpdates($handle);

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Model/Layout/Merge.php#L512-L522


/**
 * Add updates for the specified handle
 *
 * @param string $handle
 * @return bool
 */
protected function _fetchPackageLayoutUpdates($handle)
{
    $_profilerKey = 'layout_package_update:' . $handle;
    \Magento\Framework\Profiler::start($_profilerKey);
    $layout = $this->getFileLayoutUpdatesXml();

github.com

magento/magento2/blob/1464a2c/lib/internal/Magento/Framework/View/Model/Layout/Merge.php#L613-L628


/**
 * Retrieve already merged layout updates from files for specified area/theme/package/store
 *
 * @return \Magento\Framework\View\Layout\Element
 */
public function getFileLayoutUpdatesXml()
{
    if ($this->layoutUpdatesCache) {
        return $this->layoutUpdatesCache;
    }
    $cacheId = $this->generateCacheId($this->cacheSuffix);
    $result = $this->_loadCache($cacheId);
    if ($result) {
        $result = $this->_loadXmlString($result);
    } else {
        $result = $this->_loadFileLayoutUpdatesXml();

Details: How does \Magento\Framework\View\Model\Layout\Merge::_loadFileLayoutUpdatesXml() work?

dmitry_fedyuk · April 6, 2016, 1:43am