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<?php
class Custom_Background
{
public $admin_header_callback;
public $admin_image_div_callback;
private $updated;
public function __construct($admin_header_callback = '', $admin_image_div_callback = '')
{
$this->admin_header_callback = $admin_header_callback;
$this->admin_image_div_callback = $admin_image_div_callback;
add_action('admin_menu', array($this, 'init'));
add_action('wp_ajax_custom-background-add', array($this, 'ajax_background_add'));
add_action('wp_ajax_set-background-image', array($this, 'wp_set_background_image'));
}
public function init()
{
$page = add_theme_page(__('Background'), __('Background'), 'edit_theme_options', 'custom-background', array($this, 'admin_page'));
if (!$page) {
return;
}
add_action("load-{$page}", array($this, 'admin_load'));
add_action("load-{$page}", array($this, 'take_action'), 49);
add_action("load-{$page}", array($this, 'handle_upload'), 49);
if ($this->admin_header_callback) {
add_action("admin_head-{$page}", $this->admin_header_callback, 51);
}
}
public function admin_load()
{
get_current_screen()->add_help_tab(array('id' => 'overview', 'title' => __('Overview'), 'content' => '<p>' . __('You can customize the look of your site without touching any of your theme’s code by using a custom background. Your background can be an image or a color.') . '</p>' . '<p>' . __('To use a background image, simply upload it or choose an image that has already been uploaded to your Media Library by clicking the “Choose Image” button. You can display a single instance of your image, or tile it to fill the screen. You can have your background fixed in place, so your site content moves on top of it, or you can have it scroll with your site.') . '</p>' . '<p>' . __('You can also choose a background color by clicking the Select Color button and either typing in a legitimate HTML hex value, e.g. “#ff0000” for red, or by choosing a color using the color picker.') . '</p>' . '<p>' . __('Don’t forget to click on the Save Changes button when you are finished.') . '</p>'));
get_current_screen()->set_help_sidebar('<p><strong>' . __('For more information:') . '</strong></p>' . '<p>' . __('<a href="https://codex.wordpress.org/Appearance_Background_Screen">Documentation on Custom Background</a>') . '</p>' . '<p>' . __('<a href="https://wordpress.org/support/">Support</a>') . '</p>');
wp_enqueue_media();
wp_enqueue_script('custom-background');
wp_enqueue_style('wp-color-picker');
}
public function take_action()
{
if (empty($_POST)) {
return;
}
if (isset($_POST['reset-background'])) {
check_admin_referer('custom-background-reset', '_wpnonce-custom-background-reset');
remove_theme_mod('background_image');
remove_theme_mod('background_image_thumb');
$this->updated = true;
return;
}
if (isset($_POST['remove-background'])) {
check_admin_referer('custom-background-remove', '_wpnonce-custom-background-remove');
set_theme_mod('background_image', '');
set_theme_mod('background_image_thumb', '');
$this->updated = true;
wp_safe_redirect($_POST['_wp_http_referer']);
return;
}
if (isset($_POST['background-preset'])) {
check_admin_referer('custom-background');
if (in_array($_POST['background-preset'], array('default', 'fill', 'fit', 'repeat', 'custom'), true)) {
$preset = $_POST['background-preset'];
} else {
$preset = 'default';
}
set_theme_mod('background_preset', $preset);
}
if (isset($_POST['background-position'])) {
check_admin_referer('custom-background');
$position = explode(' ', $_POST['background-position']);
if (in_array($position[0], array('left', 'center', 'right'), true)) {
$position_x = $position[0];
} else {
$position_x = 'left';
}
if (in_array($position[1], array('top', 'center', 'bottom'), true)) {
$position_y = $position[1];
} else {
$position_y = 'top';
}
set_theme_mod('background_position_x', $position_x);
set_theme_mod('background_position_y', $position_y);
}
if (isset($_POST['background-size'])) {
check_admin_referer('custom-background');
if (in_array($_POST['background-size'], array('auto', 'contain', 'cover'), true)) {
$size = $_POST['background-size'];
} else {
$size = 'auto';
}
set_theme_mod('background_size', $size);
}
if (isset($_POST['background-repeat'])) {
check_admin_referer('custom-background');
$repeat = $_POST['background-repeat'];
if ('no-repeat' !== $repeat) {
$repeat = 'repeat';
}
set_theme_mod('background_repeat', $repeat);
}
if (isset($_POST['background-attachment'])) {
check_admin_referer('custom-background');
$attachment = $_POST['background-attachment'];
if ('fixed' !== $attachment) {
$attachment = 'scroll';
}
set_theme_mod('background_attachment', $attachment);
}
if (isset($_POST['background-color'])) {
check_admin_referer('custom-background');
$color = preg_replace('/[^0-9a-fA-F]/', '', $_POST['background-color']);
if (strlen($color) == 6 || strlen($color) == 3) {
set_theme_mod('background_color', $color);
} else {
set_theme_mod('background_color', '');
}
}
$this->updated = true;
}
public function admin_page()
{
?>
<div class="wrap" id="custom-background">
<h1><?php
_e('Custom Background');
?></h1>
<?php
if (current_user_can('customize')) {
?>
<div class="notice notice-info hide-if-no-customize">
<p>
<?php
printf(__('You can now manage and live-preview Custom Backgrounds in the <a href="%s">Customizer</a>.'), admin_url('customize.php?autofocus[control]=background_image'));
?>
</p>
</div>
<?php
}
?>
<?php
if (!empty($this->updated)) {
?>
<div id="message" class="updated">
<p>
<?php
printf(__('Background updated. <a href="%s">Visit your site</a> to see how it looks.'), home_url('/'));
?>
</p>
</div>
<?php
}
?>
<h2><?php
_e('Background Image');
?></h2>
<table class="form-table" role="presentation">
<tbody>
<tr>
<th scope="row"><?php
_e('Preview');
?></th>
<td>
<?php
if ($this->admin_image_div_callback) {
call_user_func($this->admin_image_div_callback);
} else {
$background_styles = '';
$bgcolor = get_background_color();
if ($bgcolor) {
$background_styles .= 'background-color: #' . $bgcolor . ';';
}
$background_image_thumb = get_background_image();
if ($background_image_thumb) {
$background_image_thumb = esc_url(set_url_scheme(get_theme_mod('background_image_thumb', str_replace('%', '%%', $background_image_thumb))));
$background_position_x = get_theme_mod('background_position_x', get_theme_support('custom-background', 'default-position-x'));
$background_position_y = get_theme_mod('background_position_y', get_theme_support('custom-background', 'default-position-y'));
$background_size = get_theme_mod('background_size', get_theme_support('custom-background', 'default-size'));
$background_repeat = get_theme_mod('background_repeat', get_theme_support('custom-background', 'default-repeat'));
$background_attachment = get_theme_mod('background_attachment', get_theme_support('custom-background', 'default-attachment'));
$background_styles .= " background-image: url('{$background_image_thumb}');" . " background-size: {$background_size};" . " background-position: {$background_position_x} {$background_position_y};" . " background-repeat: {$background_repeat};" . " background-attachment: {$background_attachment};";
}
?>
<div id="custom-background-image" style="<?php
echo $background_styles;
?>"><?php
?>
<?php
if ($background_image_thumb) {
?>
<img class="custom-background-image" src="<?php
echo $background_image_thumb;
?>" style="visibility:hidden;" alt="" /><br />
<img class="custom-background-image" src="<?php
echo $background_image_thumb;
?>" style="visibility:hidden;" alt="" />
<?php
}
?>
</div>
<?php
}
?>
</td>
</tr>
<?php
if (get_background_image()) {
?>
<tr>
<th scope="row"><?php
_e('Remove Image');
?></th>
<td>
<form method="post">
<?php
wp_nonce_field('custom-background-remove', '_wpnonce-custom-background-remove');
?>
<?php
submit_button(__('Remove Background Image'), '', 'remove-background', false);
?><br/>
<?php
_e('This will remove the background image. You will not be able to restore any customizations.');
?>
</form>
</td>
</tr>
<?php
}
?>
<?php
$default_image = get_theme_support('custom-background', 'default-image');
?>
<?php
if ($default_image && get_background_image() != $default_image) {
?>
<tr>
<th scope="row"><?php
_e('Restore Original Image');
?></th>
<td>
<form method="post">
<?php
wp_nonce_field('custom-background-reset', '_wpnonce-custom-background-reset');
?>
<?php
submit_button(__('Restore Original Image'), '', 'reset-background', false);
?><br/>
<?php
_e('This will restore the original background image. You will not be able to restore any customizations.');
?>
</form>
</td>
</tr>
<?php
}
?>
<?php
if (current_user_can('upload_files')) {
?>
<tr>
<th scope="row"><?php
_e('Select Image');
?></th>
<td><form enctype="multipart/form-data" id="upload-form" class="wp-upload-form" method="post">
<p>
<label for="upload"><?php
_e('Choose an image from your computer:');
?></label><br />
<input type="file" id="upload" name="import" />
<input type="hidden" name="action" value="save" />
<?php
wp_nonce_field('custom-background-upload', '_wpnonce-custom-background-upload');
?>
<?php
submit_button(__('Upload'), '', 'submit', false);
?>
</p>
<p>
<label for="choose-from-library-link"><?php
_e('Or choose an image from your media library:');
?></label><br />
<button id="choose-from-library-link" class="button"
data-choose="<?php
esc_attr_e('Choose a Background Image');
?>"
data-update="<?php
esc_attr_e('Set as background');
?>"><?php
_e('Choose Image');
?></button>
</p>
</form>
</td>
</tr>
<?php
}
?>
</tbody>
</table>
<h2><?php
_e('Display Options');
?></h2>
<form method="post">
<table class="form-table" role="presentation">
<tbody>
<?php
if (get_background_image()) {
?>
<input name="background-preset" type="hidden" value="custom">
<?php
$background_position = sprintf('%s %s', get_theme_mod('background_position_x', get_theme_support('custom-background', 'default-position-x')), get_theme_mod('background_position_y', get_theme_support('custom-background', 'default-position-y')));
$background_position_options = array(array('left top' => array('label' => __('Top Left'), 'icon' => 'dashicons dashicons-arrow-left-alt'), 'center top' => array('label' => __('Top'), 'icon' => 'dashicons dashicons-arrow-up-alt'), 'right top' => array('label' => __('Top Right'), 'icon' => 'dashicons dashicons-arrow-right-alt')), array('left center' => array('label' => __('Left'), 'icon' => 'dashicons dashicons-arrow-left-alt'), 'center center' => array('label' => __('Center'), 'icon' => 'background-position-center-icon'), 'right center' => array('label' => __('Right'), 'icon' => 'dashicons dashicons-arrow-right-alt')), array('left bottom' => array('label' => __('Bottom Left'), 'icon' => 'dashicons dashicons-arrow-left-alt'), 'center bottom' => array('label' => __('Bottom'), 'icon' => 'dashicons dashicons-arrow-down-alt'), 'right bottom' => array('label' => __('Bottom Right'), 'icon' => 'dashicons dashicons-arrow-right-alt')));
?>
<tr>
<th scope="row"><?php
_e('Image Position');
?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php
_e('Image Position');
?></span></legend>
<div class="background-position-control">
<?php
foreach ($background_position_options as $group) {
?>
<div class="button-group">
<?php
foreach ($group as $value => $input) {
?>
<label>
<input class="screen-reader-text" name="background-position" type="radio" value="<?php
echo esc_attr($value);
?>"<?php
checked($value, $background_position);
?>>
<span class="button display-options position"><span class="<?php
echo esc_attr($input['icon']);
?>" aria-hidden="true"></span></span>
<span class="screen-reader-text"><?php
echo $input['label'];
?></span>
</label>
<?php
}
?>
</div>
<?php
}
?>
</div>
</fieldset></td>
</tr>
<tr>
<th scope="row"><label for="background-size"><?php
_e('Image Size');
?></label></th>
<td><fieldset><legend class="screen-reader-text"><span><?php
_e('Image Size');
?></span></legend>
<select id="background-size" name="background-size">
<option value="auto"<?php
selected('auto', get_theme_mod('background_size', get_theme_support('custom-background', 'default-size')));
?>><?php
_ex('Original', 'Original Size');
?></option>
<option value="contain"<?php
selected('contain', get_theme_mod('background_size', get_theme_support('custom-background', 'default-size')));
?>><?php
_e('Fit to Screen');
?></option>
<option value="cover"<?php
selected('cover', get_theme_mod('background_size', get_theme_support('custom-background', 'default-size')));
?>><?php
_e('Fill Screen');
?></option>
</select>
</fieldset></td>
</tr>
<tr>
<th scope="row"><?php
_ex('Repeat', 'Background Repeat');
?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php
_ex('Repeat', 'Background Repeat');
?></span></legend>
<input name="background-repeat" type="hidden" value="no-repeat">
<label><input type="checkbox" name="background-repeat" value="repeat"<?php
checked('repeat', get_theme_mod('background_repeat', get_theme_support('custom-background', 'default-repeat')));
?>> <?php
_e('Repeat Background Image');
?></label>
</fieldset></td>
</tr>
<tr>
<th scope="row"><?php
_ex('Scroll', 'Background Scroll');
?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php
_ex('Scroll', 'Background Scroll');
?></span></legend>
<input name="background-attachment" type="hidden" value="fixed">
<label><input name="background-attachment" type="checkbox" value="scroll" <?php
checked('scroll', get_theme_mod('background_attachment', get_theme_support('custom-background', 'default-attachment')));
?>> <?php
_e('Scroll with Page');
?></label>
</fieldset></td>
</tr>
<?php
}
?>
<tr>
<th scope="row"><?php
_e('Background Color');
?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php
_e('Background Color');
?></span></legend>
<?php
$default_color = '';
if (current_theme_supports('custom-background', 'default-color')) {
$default_color = ' data-default-color="#' . esc_attr(get_theme_support('custom-background', 'default-color')) . '"';
}
?>
<input type="text" name="background-color" id="background-color" value="#<?php
echo esc_attr(get_background_color());
?>"<?php
echo $default_color;
?>>
</fieldset></td>
</tr>
</tbody>
</table>
<?php
wp_nonce_field('custom-background');
?>
<?php
submit_button(null, 'primary', 'save-background-options');
?>
</form>
</div>
<?php
}
public function handle_upload()
{
if (empty($_FILES)) {
return;
}
check_admin_referer('custom-background-upload', '_wpnonce-custom-background-upload');
$overrides = array('test_form' => false);
$uploaded_file = $_FILES['import'];
$wp_filetype = wp_check_filetype_and_ext($uploaded_file['tmp_name'], $uploaded_file['name']);
if (!wp_match_mime_types('image', $wp_filetype['type'])) {
wp_die(__('The uploaded file is not a valid image. Please try again.'));
}
$file = wp_handle_upload($uploaded_file, $overrides);
if (isset($file['error'])) {
wp_die($file['error']);
}
$url = $file['url'];
$type = $file['type'];
$file = $file['file'];
$filename = wp_basename($file);
$object = array('post_title' => $filename, 'post_content' => $url, 'post_mime_type' => $type, 'guid' => $url, 'context' => 'custom-background');
$id = wp_insert_attachment($object, $file);
wp_update_attachment_metadata($id, wp_generate_attachment_metadata($id, $file));
update_post_meta($id, '_wp_attachment_is_custom_background', get_option('stylesheet'));
set_theme_mod('background_image', esc_url_raw($url));
$thumbnail = wp_get_attachment_image_src($id, 'thumbnail');
set_theme_mod('background_image_thumb', esc_url_raw($thumbnail[0]));
do_action('wp_create_file_in_uploads', $file, $id);
$this->updated = true;
}
public function ajax_background_add()
{
check_ajax_referer('background-add', 'nonce');
if (!current_user_can('edit_theme_options')) {
wp_send_json_error();
}
$attachment_id = absint($_POST['attachment_id']);
if ($attachment_id < 1) {
wp_send_json_error();
}
update_post_meta($attachment_id, '_wp_attachment_is_custom_background', get_stylesheet());
wp_send_json_success();
}
public function attachment_fields_to_edit($form_fields)
{
return $form_fields;
}
public function filter_upload_tabs($tabs)
{
return $tabs;
}
public function wp_set_background_image()
{
check_ajax_referer('custom-background');
if (!current_user_can('edit_theme_options') || !isset($_POST['attachment_id'])) {
exit;
}
$attachment_id = absint($_POST['attachment_id']);
$sizes = array_keys(apply_filters('image_size_names_choose', array('thumbnail' => __('Thumbnail'), 'medium' => __('Medium'), 'large' => __('Large'), 'full' => __('Full Size'))));
$size = 'thumbnail';
if (in_array($_POST['size'], $sizes, true)) {
$size = esc_attr($_POST['size']);
}
update_post_meta($attachment_id, '_wp_attachment_is_custom_background', get_option('stylesheet'));
$url = wp_get_attachment_image_src($attachment_id, $size);
$thumbnail = wp_get_attachment_image_src($attachment_id, 'thumbnail');
set_theme_mod('background_image', esc_url_raw($url[0]));
set_theme_mod('background_image_thumb', esc_url_raw($thumbnail[0]));
exit;
}
}