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<?php |
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namespace Amarkal\Settings; |
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/** |
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* Implements a settings page. |
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*/ |
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class SettingsPage |
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{ |
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/** |
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* Configuration array |
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* |
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* @var array |
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*/ |
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private $config; |
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/** |
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* The UI form instance |
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* |
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* @var Amarkal\UI\Form |
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*/ |
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private $form; |
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/** |
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* The list of arguments for each section |
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* |
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* @var array |
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*/ |
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private $sections; |
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/** |
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* The list of fields for the entire settings page |
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* |
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* @var Amarkal\UI\ComponentList |
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*/ |
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private $fields; |
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/** |
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* An instance of the current field values (either the from the database, or the defaults) |
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* |
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* @var array |
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*/ |
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private $values; |
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/** |
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* Set the config, create a form instance and add actions. |
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* |
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* @param array $config |
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*/ |
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public function __construct( array $config = array() ) |
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{ |
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$this->config = array_merge($this->default_args(), $config); |
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$this->fields = new \Amarkal\UI\ComponentList(); |
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$this->sections = array(); |
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$this->form = new \Amarkal\UI\Form($this->fields); |
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\add_action('admin_menu', array($this,'add_submenu_page')); |
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\add_action('admin_enqueue_scripts', array($this,'enqueue_scripts')); |
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} |
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/** |
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* Add a section to this settings page |
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* |
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* @param array $args |
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* @return void |
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*/ |
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public function add_section( array $args ) |
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{ |
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$args = \array_merge($this->default_section_args(), $args); |
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$slug = $args['slug']; |
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if(array_key_exists($slug, $this->sections)) |
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{ |
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throw new \RuntimeException("A section with '$slug' has already been created for this page."); |
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} |
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$this->sections[$slug] = $args; |
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} |
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/** |
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* Add a settings field to this settings page |
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* |
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* @param array $args |
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* @return void |
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*/ |
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public function add_field( array $args ) |
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{ |
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$this->fields->add_component($args); |
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} |
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/** |
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* Get the current values for all fields from the database, or the default values if none exists |
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* |
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* @return array |
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*/ |
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public function get_field_values() |
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{ |
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if(!isset($this->values)) |
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{ |
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$this->values = array_merge($this->form->reset(), $this->get_old_instance()); |
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} |
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return $this->values; |
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} |
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/** |
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* Get the value of the given field from the database, or the default value if none exists |
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* |
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* @param string $name |
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* @return any |
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*/ |
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public function get_field_value( $name ) |
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{ |
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$values = $this->get_field_values(); |
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return $values[$name]; |
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} |
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/** |
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* Internally used to add a submenu page for this settings page |
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*/ |
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public function add_submenu_page() |
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{ |
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\add_submenu_page( |
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$this->config['parent_slug'], |
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$this->config['title'], |
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$this->config['menu_title'], |
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$this->config['capability'], |
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$this->config['slug'], |
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array($this, 'render') |
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); |
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} |
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/** |
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* Conditionally enqueue settings scripts and styles if the calling page is |
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* a settings page. |
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*/ |
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public function enqueue_scripts() |
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{ |
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// Only enqueue styles & scripts if this is a settings page |
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if($this->config['slug'] === filter_input(INPUT_GET, 'page')) |
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{ |
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\wp_enqueue_style('amarkal-settings'); |
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\wp_enqueue_script('amarkal-settings'); |
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} |
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} |
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/** |
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* Render the settings page |
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*/ |
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public function render() |
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{ |
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$this->form->update($this->get_old_instance()); |
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include __DIR__.'/SettingsPage.phtml'; |
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\add_filter('admin_footer_text', array($this, 'footer_credits')); |
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} |
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/** |
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* Ajax callback internally used to update options values for the given |
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* settings page. |
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* |
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* @param array $new_instance |
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* @return array |
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*/ |
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View Code Duplication |
public function update( $new_instance ) |
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{ |
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if($this->can_update()) |
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{ |
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$old_instance = $this->get_old_instance(); |
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$this->values = $this->form->update($new_instance, $old_instance); |
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\update_option($this->config['slug'], $this->values); |
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return $this->results_array( |
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$this->get_errors(), |
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$this->values |
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); |
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} |
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return $this->results_array( |
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array("You don't have permission to manage options on this site") |
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); |
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} |
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/** |
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* Ajax callback internally used to reset all component values to their |
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* defaults for the given settings page. |
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* |
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* @return type |
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*/ |
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public function reset() |
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{ |
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if($this->can_update()) |
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{ |
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\delete_option($this->config['slug']); |
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$this->values = $this->form->reset(); |
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return $this->results_array( |
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array(), |
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$this->values |
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); |
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} |
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return $this->results_array( |
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array("You don't have permission to manage options on this site") |
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); |
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} |
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/** |
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* Ajax callback internally used to reset all component values to their |
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* defaults for the given settings section. |
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* |
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* @param string $slug |
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* @return void |
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*/ |
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View Code Duplication |
public function reset_section( $slug ) |
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{ |
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if($this->can_update()) |
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{ |
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$old_instance = $this->get_old_instance(); |
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$final_instance = $this->form->reset_components($this->get_section_fields($slug)); |
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// Array merge is needed in order not to delete fields from other sections |
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// since the $final_instance only contains the fields that were reset |
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$this->values = array_merge($old_instance, $final_instance); |
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\update_option($this->config['slug'], $this->values); |
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return $this->results_array( |
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array(), |
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$this->values |
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); |
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} |
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return $this->results_array( |
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array("You don't have permission to manage options on this site") |
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); |
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} |
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/** |
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* Renders Amarkal's credits on the page's footer. |
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*/ |
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public function footer_credits() |
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{ |
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echo '<span id="footer-thankyou">Created with <a href="https://github.com/askupasoftware/amarkal-settings">amarkal-settings</a>, a module within the <a href="https://github.com/askupasoftware/amarkal">Amarkal Framework</a></span>'; |
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} |
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/** |
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* Get the component corresponding to the given name |
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* |
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* @param [string] $name |
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* @throws RuntimeException when the component cannot be found |
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* @return void |
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*/ |
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public function get_component($name) |
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{ |
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return $this->form->get_component_list()->get_by_name($name); |
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} |
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/** |
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* Get all the fields for the given section |
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* |
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* @param string $slug |
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* @return array |
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*/ |
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private function get_section_fields($slug) |
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{ |
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$fields = array(); |
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foreach($this->fields->get_all() as $c) |
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{ |
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if($c->section === $slug) |
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{ |
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$fields[] = $c; |
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} |
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} |
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return $fields; |
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} |
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/** |
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* Get all errors from the form instance. |
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* |
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* @return array |
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*/ |
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private function get_errors() |
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{ |
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$errors = array(); |
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foreach($this->form->get_errors() as $name => $error) |
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{ |
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$errors[$name] = $error; |
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} |
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return $errors; |
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} |
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/** |
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* Generates a results array to be returned when an Ajax request is made. |
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* |
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* @param array $errors The list of errors |
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* @param array $values The list of values |
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* @return array |
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*/ |
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private function results_array( $errors = array(), $values = '' ) |
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{ |
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return array( |
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'values' => $values, |
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'errors' => $errors |
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); |
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} |
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/** |
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* Check if the current user has the required privileges to update the |
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* settings values. |
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* |
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* @return boolean |
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*/ |
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private function can_update() |
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{ |
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return \current_user_can($this->config['capability']); |
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} |
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/** |
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* Get the old instance from the database. |
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* |
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* @return array |
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*/ |
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private function get_old_instance() |
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{ |
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return \get_option($this->config['slug'], array()); |
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} |
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/** |
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* The default config arguments array for a page. |
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* |
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* @return array |
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*/ |
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private function default_args() |
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{ |
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return array( |
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'parent_slug' => '', |
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'slug' => '', |
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'title' => '', |
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'subtitle' => '', |
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'menu_title' => '', |
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'capability' => 'manage_options', |
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'footer_html' => '', |
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'subfooter_html' => '' |
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); |
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} |
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/** |
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* The default config arguments array for a section. |
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* |
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* @return void |
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*/ |
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private function default_section_args() |
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{ |
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return array( |
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'slug' => '', |
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'title' => '', |
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'subtitle' => '' |
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); |
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} |
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} |