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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form;
/**
* Adapter for rendering form templates with a specific templating engine.
*
* @author Bernhard Schussek <[email protected]>
*/
interface FormRendererEngineInterface
{
/**
* Sets the theme(s) to be used for rendering a view and its children.
*
* @param FormView $view The view to assign the theme(s) to
* @param mixed $themes The theme(s). The type of these themes
* is open to the implementation.
*/
public function setTheme(FormView $view, $themes, bool $useDefaultThemes = true);
/**
* Returns the resource for a block name.
*
* The resource is first searched in the themes attached to $view, then
* in the themes of its parent view and so on, until a resource was found.
*
* The type of the resource is decided by the implementation. The resource
* is later passed to {@link renderBlock()} by the rendering algorithm.
*
* @param FormView $view The view for determining the used themes.
* First the themes attached directly to the
* view with {@link setTheme()} are considered,
* then the ones of its parent etc.
*
* @return mixed the renderer resource or false, if none was found
*/
public function getResourceForBlockName(FormView $view, string $blockName);
/**
* Returns the resource for a block hierarchy.
*
* A block hierarchy is an array which starts with the root of the hierarchy
* and continues with the child of that root, the child of that child etc.
* The following is an example for a block hierarchy:
*
* form_widget
* text_widget
* url_widget
*
* In this example, "url_widget" is the most specific block, while the other
* blocks are its ancestors in the hierarchy.
*
* The second parameter $hierarchyLevel determines the level of the hierarchy
* that should be rendered. For example, if $hierarchyLevel is 2 for the
* above hierarchy, the engine will first look for the block "url_widget",
* then, if that does not exist, for the block "text_widget" etc.
*
* The type of the resource is decided by the implementation. The resource
* is later passed to {@link renderBlock()} by the rendering algorithm.
*
* @param FormView $view The view for determining the used themes.
* First the themes attached directly to
* the view with {@link setTheme()} are
* considered, then the ones of its parent etc.
* @param string[] $blockNameHierarchy The block name hierarchy, with the root block
* at the beginning
* @param int $hierarchyLevel The level in the hierarchy at which to start
* looking. Level 0 indicates the root block, i.e.
* the first element of $blockNameHierarchy.
*
* @return mixed The renderer resource or false, if none was found
*/
public function getResourceForBlockNameHierarchy(FormView $view, array $blockNameHierarchy, int $hierarchyLevel);
/**
* Returns the hierarchy level at which a resource can be found.
*
* A block hierarchy is an array which starts with the root of the hierarchy
* and continues with the child of that root, the child of that child etc.
* The following is an example for a block hierarchy:
*
* form_widget
* text_widget
* url_widget
*
* The second parameter $hierarchyLevel determines the level of the hierarchy
* that should be rendered.
*
* If we call this method with the hierarchy level 2, the engine will first
* look for a resource for block "url_widget". If such a resource exists,
* the method returns 2. Otherwise it tries to find a resource for block
* "text_widget" (at level 1) and, again, returns 1 if a resource was found.
* The method continues to look for resources until the root level was
* reached and nothing was found. In this case false is returned.
*
* The type of the resource is decided by the implementation. The resource
* is later passed to {@link renderBlock()} by the rendering algorithm.
*
* @param FormView $view The view for determining the used themes.
* First the themes attached directly to
* the view with {@link setTheme()} are
* considered, then the ones of its parent etc.
* @param string[] $blockNameHierarchy The block name hierarchy, with the root block
* at the beginning
* @param int $hierarchyLevel The level in the hierarchy at which to start
* looking. Level 0 indicates the root block, i.e.
* the first element of $blockNameHierarchy.
*
* @return int|false
*/
public function getResourceHierarchyLevel(FormView $view, array $blockNameHierarchy, int $hierarchyLevel);
/**
* Renders a block in the given renderer resource.
*
* The resource can be obtained by calling {@link getResourceForBlock()}
* or {@link getResourceForBlockHierarchy()}. The type of the resource is
* decided by the implementation.
*
* @param FormView $view The view to render
* @param mixed $resource The renderer resource
* @param array $variables The variables to pass to the template
*
* @return string
*/
public function renderBlock(FormView $view, $resource, string $blockName, array $variables = []);
}