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<?php |
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|
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/** |
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* The preview class |
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* |
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* This is a clever technique to preview a form without having to set any placeholder page by |
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* setting the page templates to singular pages (page.php, single.php and index.php). Setting |
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* the posts per page to 1 and changing the page title and contents dynamiclly allows us to |
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* preview the form without any placeholder page. |
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* |
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* This technique requires the theme to have at least the above mentioned templates in the theme |
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* and requires to have the WordPress Loop, otherwise we wouldn't be able to set the title and |
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* the page content dynamically. |
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* |
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* The technique is borrowed from Ninja Forms (thanks guys!) |
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*/ |
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class WeForms_Form_Preview { |
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|
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/** |
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* Form id |
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* |
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* @var integer |
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*/ |
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private $form_id; |
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|
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function __construct() { |
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|
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if ( ! isset( $_GET['weforms_preview'] ) ) { |
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return; |
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} |
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|
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$this->form_id = isset( $_GET['form_id'] ) ? intval( $_GET['form_id'] ) : 0; |
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|
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add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ) ); |
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add_filter( 'template_include', array( $this, 'template_include' ) ); |
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|
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add_filter( 'the_title', array( $this, 'the_title' ) ); |
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add_filter( 'the_content', array( $this, 'the_content' ) ); |
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add_filter( 'get_the_excerpt', array( $this, 'the_content' ) ); |
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add_filter( 'post_thumbnail_html', '__return_empty_string' ); |
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} |
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|
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/** |
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* Set the page title |
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* |
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* @param string $title |
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* |
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* @return string |
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*/ |
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public function the_title( $title ) { |
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if ( ! in_the_loop() ) { |
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return $title; |
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} |
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|
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$form = weform_get_form( $this->form_id ); |
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|
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if ( ! $form ) { |
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return $title; |
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} |
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|
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return $form->post_title . ' ' . __( 'Preview', 'weforms' ); |
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} |
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|
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/** |
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* Set the content of the page |
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* |
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* @param string $content |
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* |
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* @return string |
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*/ |
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public function the_content( $content ) { |
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|
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if ( ! is_user_logged_in() ) { |
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return __( 'You must be logged in to preview this form.', 'weforms' ); |
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} |
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|
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$viewing_capability = apply_filters( 'weforms_preview_form_cap', 'edit_posts' ); // at least has to be contributor |
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|
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if ( ! current_user_can( $viewing_capability ) ) { |
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return __( 'Sorry, you are not eligible to preview this form.', 'weforms' ); |
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} |
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|
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return do_shortcode( sprintf( '[weforms id="%d"]', $this->form_id ) ); |
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} |
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|
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/** |
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* Set the posts to one |
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* |
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* @param WP_Query $query |
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* |
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* @return void |
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*/ |
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public function pre_get_posts( $query ) { |
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if ( $query->is_main_query() ) { |
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$query->set( 'posts_per_page', 1 ); |
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} |
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} |
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|
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/** |
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* Limit the page templates to singular pages only |
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* |
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* @return string |
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*/ |
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function template_include() { |
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return locate_template( array( 'page.php', 'single.php', 'index.php' ) ); |
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} |
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} |
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|
