mirror of
https://github.com/tag1consulting/d7_to_d10_migration.git
synced 2024-11-10 02:33:25 +00:00
240 lines
8.8 KiB
PHP
240 lines
8.8 KiB
PHP
<?php
|
|
|
|
/**
|
|
* @defgroup themeable Default theme implementations
|
|
* @{
|
|
* Functions and templates for the user interface to be implemented by themes.
|
|
*
|
|
* Drupal's presentation layer is a pluggable system known as the theme
|
|
* layer. Each theme can take control over most of Drupal's output, and
|
|
* has complete control over the CSS.
|
|
*
|
|
* Inside Drupal, the theme layer is utilized by the use of the theme()
|
|
* function, which is passed the name of a component (the theme hook)
|
|
* and an array of variables. For example,
|
|
* theme('table', array('header' => $header, 'rows' => $rows));
|
|
* Additionally, the theme() function can take an array of theme
|
|
* hooks, which can be used to provide 'fallback' implementations to
|
|
* allow for more specific control of output. For example, the function:
|
|
* theme(array('table__foo', 'table'), $variables) would look to see if
|
|
* 'table__foo' is registered anywhere; if it is not, it would 'fall back'
|
|
* to the generic 'table' implementation. This can be used to attach specific
|
|
* theme functions to named objects, allowing the themer more control over
|
|
* specific types of output.
|
|
*
|
|
* As of Drupal 6, every theme hook is required to be registered by the
|
|
* module that owns it, so that Drupal can tell what to do with it and
|
|
* to make it simple for themes to identify and override the behavior
|
|
* for these calls.
|
|
*
|
|
* The theme hooks are registered via hook_theme(), which returns an
|
|
* array of arrays with information about the hook. It describes the
|
|
* arguments the function or template will need, and provides
|
|
* defaults for the template in case they are not filled in. If the default
|
|
* implementation is a function, by convention it is named theme_HOOK().
|
|
*
|
|
* Each module should provide a default implementation for theme_hooks that
|
|
* it registers. This implementation may be either a function or a template;
|
|
* if it is a function it must be specified via hook_theme(). By convention,
|
|
* default implementations of theme hooks are named theme_HOOK. Default
|
|
* template implementations are stored in the module directory.
|
|
*
|
|
* Drupal's default template renderer is a simple PHP parsing engine that
|
|
* includes the template and stores the output. Drupal's theme engines
|
|
* can provide alternate template engines, such as XTemplate, Smarty and
|
|
* PHPTal. The most common template engine is PHPTemplate (included with
|
|
* Drupal and implemented in phptemplate.engine, which uses Drupal's default
|
|
* template renderer.
|
|
*
|
|
* In order to create theme-specific implementations of these hooks, themes can
|
|
* implement their own version of theme hooks, either as functions or templates.
|
|
* These implementations will be used instead of the default implementation. If
|
|
* using a pure .theme without an engine, the .theme is required to implement
|
|
* its own version of hook_theme() to tell Drupal what it is implementing;
|
|
* themes utilizing an engine will have their well-named theming functions
|
|
* automatically registered for them. While this can vary based upon the theme
|
|
* engine, the standard set by phptemplate is that theme functions should be
|
|
* named THEMENAME_HOOK. For example, for Drupal's default theme (Bartik) to
|
|
* implement the 'table' hook, the phptemplate.engine would find
|
|
* bartik_table().
|
|
*
|
|
* The theme system is described and defined in theme.inc.
|
|
*
|
|
* @see theme()
|
|
* @see hook_theme()
|
|
* @see hooks
|
|
* @see callbacks
|
|
*
|
|
* @} End of "defgroup themeable".
|
|
*/
|
|
|
|
/**
|
|
* Allow themes to alter the theme-specific settings form.
|
|
*
|
|
* With this hook, themes can alter the theme-specific settings form in any way
|
|
* allowable by Drupal's Form API, such as adding form elements, changing
|
|
* default values and removing form elements. See the Form API documentation on
|
|
* api.drupal.org for detailed information.
|
|
*
|
|
* Note that the base theme's form alterations will be run before any sub-theme
|
|
* alterations.
|
|
*
|
|
* @param $form
|
|
* Nested array of form elements that comprise the form.
|
|
* @param $form_state
|
|
* A keyed array containing the current state of the form.
|
|
*/
|
|
function hook_form_system_theme_settings_alter(&$form, &$form_state) {
|
|
// Add a checkbox to toggle the breadcrumb trail.
|
|
$form['toggle_breadcrumb'] = array(
|
|
'#type' => 'checkbox',
|
|
'#title' => t('Display the breadcrumb'),
|
|
'#default_value' => theme_get_setting('toggle_breadcrumb'),
|
|
'#description' => t('Show a trail of links from the homepage to the current page.'),
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Preprocess theme variables for templates.
|
|
*
|
|
* This hook allows modules to preprocess theme variables for theme templates.
|
|
* It is called for all theme hooks implemented as templates, but not for theme
|
|
* hooks implemented as functions. hook_preprocess_HOOK() can be used to
|
|
* preprocess variables for a specific theme hook, whether implemented as a
|
|
* template or function.
|
|
*
|
|
* For more detailed information, see theme().
|
|
*
|
|
* @param $variables
|
|
* The variables array (modify in place).
|
|
* @param $hook
|
|
* The name of the theme hook.
|
|
*/
|
|
function hook_preprocess(&$variables, $hook) {
|
|
static $hooks;
|
|
|
|
// Add contextual links to the variables, if the user has permission.
|
|
|
|
if (!user_access('access contextual links')) {
|
|
return;
|
|
}
|
|
|
|
if (!isset($hooks)) {
|
|
$hooks = theme_get_registry();
|
|
}
|
|
|
|
// Determine the primary theme function argument.
|
|
if (isset($hooks[$hook]['variables'])) {
|
|
$keys = array_keys($hooks[$hook]['variables']);
|
|
$key = $keys[0];
|
|
}
|
|
else {
|
|
$key = $hooks[$hook]['render element'];
|
|
}
|
|
|
|
if (isset($variables[$key])) {
|
|
$element = $variables[$key];
|
|
}
|
|
|
|
if (isset($element) && is_array($element) && !empty($element['#contextual_links'])) {
|
|
$variables['title_suffix']['contextual_links'] = contextual_links_view($element);
|
|
if (!empty($variables['title_suffix']['contextual_links'])) {
|
|
$variables['classes_array'][] = 'contextual-links-region';
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Preprocess theme variables for a specific theme hook.
|
|
*
|
|
* This hook allows modules to preprocess theme variables for a specific theme
|
|
* hook. It should only be used if a module needs to override or add to the
|
|
* theme preprocessing for a theme hook it didn't define.
|
|
*
|
|
* For more detailed information, see theme().
|
|
*
|
|
* @param $variables
|
|
* The variables array (modify in place).
|
|
*/
|
|
function hook_preprocess_HOOK(&$variables) {
|
|
// This example is from rdf_preprocess_image(). It adds an RDF attribute
|
|
// to the image hook's variables.
|
|
$variables['attributes']['typeof'] = array('foaf:Image');
|
|
}
|
|
|
|
/**
|
|
* Process theme variables for templates.
|
|
*
|
|
* This hook allows modules to process theme variables for theme templates. It
|
|
* is called for all theme hooks implemented as templates, but not for theme
|
|
* hooks implemented as functions. hook_process_HOOK() can be used to process
|
|
* variables for a specific theme hook, whether implemented as a template or
|
|
* function.
|
|
*
|
|
* For more detailed information, see theme().
|
|
*
|
|
* @param $variables
|
|
* The variables array (modify in place).
|
|
* @param $hook
|
|
* The name of the theme hook.
|
|
*/
|
|
function hook_process(&$variables, $hook) {
|
|
// Wraps variables in RDF wrappers.
|
|
if (!empty($variables['rdf_template_variable_attributes_array'])) {
|
|
foreach ($variables['rdf_template_variable_attributes_array'] as $variable_name => $attributes) {
|
|
$context = array(
|
|
'hook' => $hook,
|
|
'variable_name' => $variable_name,
|
|
'variables' => $variables,
|
|
);
|
|
$variables[$variable_name] = theme('rdf_template_variable_wrapper', array('content' => $variables[$variable_name], 'attributes' => $attributes, 'context' => $context));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Process theme variables for a specific theme hook.
|
|
*
|
|
* This hook allows modules to process theme variables for a specific theme
|
|
* hook. It should only be used if a module needs to override or add to the
|
|
* theme processing for a theme hook it didn't define.
|
|
*
|
|
* For more detailed information, see theme().
|
|
*
|
|
* @param $variables
|
|
* The variables array (modify in place).
|
|
*/
|
|
function hook_process_HOOK(&$variables) {
|
|
// @todo There are no use-cases in Drupal core for this hook. Find one from a
|
|
// contributed module, or come up with a good example. Coming up with a good
|
|
// example might be tough, since the intent is for nearly everything to be
|
|
// achievable via preprocess functions, and for process functions to only be
|
|
// used when requiring the later execution time.
|
|
}
|
|
|
|
/**
|
|
* Respond to themes being enabled.
|
|
*
|
|
* @param array $theme_list
|
|
* Array containing the names of the themes being enabled.
|
|
*
|
|
* @see theme_enable()
|
|
*/
|
|
function hook_themes_enabled($theme_list) {
|
|
foreach ($theme_list as $theme) {
|
|
block_theme_initialize($theme);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Respond to themes being disabled.
|
|
*
|
|
* @param array $theme_list
|
|
* Array containing the names of the themes being disabled.
|
|
*
|
|
* @see theme_disable()
|
|
*/
|
|
function hook_themes_disabled($theme_list) {
|
|
// Clear all update module caches.
|
|
_update_cache_clear();
|
|
}
|