weforms / includes / class-form-preview.php

class-form-preview.php in weForms – Easy Drag & Drop Contact Form Builder For WordPress 1.2.0, at includes/class-form-preview.php

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1	<?php
2
3	/**
4	* The preview class
5	*
6	* This is a clever technique to preview a form without having to set any placeholder page by
7	* setting the page templates to singular pages (page.php, single.php and index.php). Setting
8	* the posts per page to 1 and changing the page title and contents dynamiclly allows us to
9	* preview the form without any placeholder page.
10	*
11	* This technique requires the theme to have at least the above mentioned templates in the theme
12	* and requires to have the WordPress Loop, otherwise we wouldn't be able to set the title and
13	* the page content dynamically.
14	*
15	* The technique is borrowed from Ninja Forms (thanks guys!)
16	*/
17	class WeForms_Form_Preview {
18
19	/**
20	* Form id
21	*
22	* @var integer
23	*/
24	private $form_id;
25
26	/**
27	* is_preview
28	*
29	* @var string
30	*/
31	private $is_preview = true;
32
33	function __construct() {
34
35	if ( ! isset( $_GET['weforms_preview'] ) && empty( $_GET['weforms'] ) ) {
36	return;
37	}
38
39	if ( ! empty( $_GET['weforms'] ) ) {
40
41	$hash = explode("_", base64_decode( $_GET['weforms'] ));
42	$_hash = $hash[0];
43	$this->form_id = intval( end($hash) );
44	$form = weforms()->form->get( $this->form_id );
45
46	if ( ! $form ) {
47	return;
48	}
49
50	$form_settings = $form->get_settings();
51
52	if ( ! isset($form_settings['sharing_on']) \|\| $form_settings['sharing_on'] !== 'on' ) {
53	return;
54	}
55
56	if ( ! isset($form_settings['sharing_hash']) \|\| $form_settings['sharing_hash'] !== $_hash ) {
57	return;
58	}
59
60	$this->is_preview = false;
61
62	} else {
63
64	$this->form_id = isset( $_GET['form_id'] ) ? intval( $_GET['form_id'] ) : 0;
65	}
66
67	add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ) );
68	add_filter( 'template_include', array( $this, 'template_include' ) );
69
70	add_filter( 'the_title', array( $this, 'the_title' ) );
71	add_filter( 'the_content', array( $this, 'the_content' ) );
72	add_filter( 'get_the_excerpt', array( $this, 'the_content' ) );
73	add_filter( 'post_thumbnail_html', '__return_empty_string' );
74	}
75
76	/**
77	* Set the page title
78	*
79	* @param string $title
80	*
81	* @return string
82	*/
83	public function the_title( $title ) {
84	if ( ! in_the_loop() ) {
85	return $title;
86	}
87
88	$form = weform_get_form( $this->form_id );
89
90	if ( ! $form ) {
91	return $title;
92	}
93
94	$preview = $this->is_preview ? 'Preview' : '';
95
96	return $form->get_name() . ' ' . $preview;
97	}
98
99	/**
100	* Set the content of the page
101	*
102	* @param string $content
103	*
104	* @return string
105	*/
106	public function the_content( $content ) {
107
108	if ( $this->is_preview ) {
109
110	if ( ! is_user_logged_in() ) {
111	return __( 'You must be logged in to preview this form.', 'weforms' );
112	}
113
114	$viewing_capability = apply_filters( 'weforms_preview_form_cap', 'edit_posts' ); // at least has to be contributor
115
116	if ( ! current_user_can( $viewing_capability ) ) {
117	return __( 'Sorry, you are not eligible to preview this form.', 'weforms' );
118	}
119	}
120
121	return do_shortcode( sprintf( '[weforms id="%d"]', $this->form_id ) );
122	}
123
124	/**
125	* Set the posts to one
126	*
127	* @param WP_Query $query
128	*
129	* @return void
130	*/
131	public function pre_get_posts( $query ) {
132	if ( $query->is_main_query() ) {
133	$query->set( 'posts_per_page', 1 );
134	}
135	}
136
137	/**
138	* Limit the page templates to singular pages only
139	*
140	* @return string
141	*/
142	function template_include() {
143	return locate_template( array( 'page.php', 'single.php', 'index.php' ) );
144	}
145	}
146