Posted over 4 years ago. Visible to the public.

Layout Loading and Misc Notes

Layout XML files are loaded here via this stack - here we are loading the layout update for the rwd/default design package, for the CMS home page. I've put a dashed line on the demarcation between layout code and other code:

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Mage_Core_Model_App->run(Array) Mage_Core_Controller_Varien_Front->dispatch() Mage_Core_Controller_Varien_Router_Standard->match(Mage_Core_Controller_Request_Http) Mage_Core_Controller_Varien_Action->dispatch('index') Mage_Cms_IndexController->indexAction() Mage_Cms_Helper_Page->renderPage(Mage_Cms_IndexController, 'home') Mage_Cms_Helper_Page->_renderPage(Mage_Cms_IndexController, 'home') --------------------------------------------------------------------------------------- Mage_Core_Controller_Varien_Action->loadLayoutUpdates() Mage_Core_Model_Layout_Update->load() Mage_Core_Model_Layout_Update->merge('default') Mage_Core_Model_Layout_Update->fetchPackageLayoutUpdates('default') Mage_Core_Model_Layout_Update->fetchFileLayoutUpdates() Mage_Core_Model_Layout_Update->getFileLayoutUpdatesXml('frontend', 'rwd', 'default', 1)

The loading of XML files relies on the design package, which is set during Mage_Core_Controller_Varien_Action::preDispatch().

Here are some important layout classes and what they do:

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Mage_Core_Model_Layout - Holds all instantiated blocks, handles block instantiation, via XML or otherwise Mage_Core_Model_Layout_Update - Loads and merges layout update XML files Mage_Core_Model_Design_Package - Handles loading of design phtml and xml, and skin files, including fallback loading. Merges JS & CSS Mage_Core_Model_Design_Fallback - Handles the fallback scheme, i.e. where to look first, then second, etc etc

Owner of this card:

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Mike Whitby
Last edit:
about 4 years ago
by Mike Whitby
Posted by Mike Whitby to Magento
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