__construct(array $defaultThemes, Environment $environment)

Creates a new renderer engine.

Parameters

array	$defaultThemes	The default themes. The type of these themes is open to the implementation.
Environment	$environment

setTheme(FormView $view, mixed $themes, bool $useDefaultThemes = true)

Sets the theme(s) to be used for rendering a view and its children.

Parameters

FormView	$view	The view to assign the theme(s) to
mixed	$themes	The theme(s). The type of these themes is open to the implementation.
bool	$useDefaultThemes	If true, will use default themes specified in the engine

mixed getResourceForBlockName(FormView $view, string $blockName)

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.

Parameters

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
string	$blockName	The name of the block to render

Return Value

mixed

the renderer resource or false, if none was found

mixed getResourceForBlockNameHierarchy(FormView $view, array $blockNameHierarchy, int $hierarchyLevel)

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.

Parameters

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
array	$blockNameHierarchy	The block name hierarchy, with the root block at the beginning
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 Value

mixed

The renderer resource or false, if none was found

int|bool getResourceHierarchyLevel(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.

Parameters

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
array	$blockNameHierarchy	The block name hierarchy, with the root block at the beginning
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 Value

int|bool

The hierarchy level or false, if no resource was found

protected bool loadResourceForBlockName(string $cacheKey, FormView $view, string $blockName)

Loads the cache with the resource for a given block name.

This implementation eagerly loads all blocks of the themes assigned to the given view and all of its ancestors views. This is necessary, because Twig receives the list of blocks later. At that point, all blocks must already be loaded, for the case that the function "block()" is used in the Twig template.

Parameters

string	$cacheKey	The cache key of the form view
FormView	$view	The form view for finding the applying themes
string	$blockName	The name of the block to load

Return Value

bool	True if the resource could be loaded, false otherwise

See also

getResourceForBlock()

string renderBlock(FormView $view, mixed $resource, string $blockName, array $variables = array())

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.

Parameters

FormView	$view	The view to render
mixed	$resource	The renderer resource
string	$blockName	The name of the block to render
array	$variables	The variables to pass to the template

Return Value

string

The HTML markup

protected loadResourcesFromTheme(string $cacheKey, mixed $theme)

Loads the resources for all blocks in a theme.

Parameters

string	$cacheKey	The cache key for storing the resource
mixed	$theme	The theme to load the block from. This parameter is passed by reference, because it might be necessary to initialize the theme first. Any changes made to this variable will be kept and be available upon further calls to this method using the same theme.