Wie füge ich der Seite mit den Hintergrundoptionen Einstellungen hinzu?

Ich entwickle ein Thema und wollte der integrierten Seite mit Hintergrundoptionen zusätzlichen Inhalt hinzufügen. Ich weiß, wie man die Einstellungs-API verwendet, um neue Designoptionen und -einstellungen zu erstellen, aber ich kann anscheinend nicht herausfinden, wo die Hintergrundseite tatsächlich aufgerufen wird. Ich habe gesucht wp-includes/theme.phpund immer noch nicht viel da, außer um die Hintergrundfunktionen aufzurufen und nichts, was die Seite tatsächlich rendert.

Könnte dies nicht mit einer Aktion geschehen?

Der Seiteninhalt für benutzerdefinierte Hintergründe wird in erstellt wp-admin/custom-background.php. Es ist keine Aktion verfügbar, bei der die Felder gedruckt werden.

Um neue Felder hinzuzufügen , müssen wir JavaScript in die Seitenfußzeile drucken. Die Aktion ist 'admin_footer-appearance_page_custom-background'.

Um diese Feldwerte zu speichern , müssen wir uns einhaken 'load-appearance_page_custom-background'.

Im folgenden Beispiel wird eine neue Option für background-origin- nützlich hinzugefügt, wenn Sie bodyin Ihrem Stylesheet einen Rahmen festgelegt haben.

add_action(
    'load-appearance_page_custom-background',
    array ( 'T5_Background_Origin', 'get_instance' )
);

/**
 * Add a new row to the background options table for 'background-origin'.
 *
 * @author  Thomas Scholz http://toscho.de
 * @version 2012.09.10
 */
class T5_Background_Origin
{
    /**
     * Main instance.
     * @type object|NULL
     */
    protected static $instance = NULL;

    /**
     * The name for the option. Will be saved as theme option.
     *
     * @link http://www.w3.org/TR/css3-background/#the-background-origin
     * @type string
     */
    protected $option = 'background_origin';

    /**
     * Label on the left side of our new option.
     *
     * @type string
     */
    protected $table_header = 'Background Origin';

    /**
     * Return an instance.
     *
     * @wp-hook load-appearance_page_custom-background
     * @return object
     */
    public static function get_instance()
    {
        NULL === self::$instance and self::$instance = new self;
        return self::$instance;
    }

    /**
     * Save our option and register the form.
     *
     * @wp-hook load-appearance_page_custom-background
     */
    public function __construct()
    {
        add_action(
            'admin_footer-appearance_page_custom-background',
            array ( $this, 'form' )
        );

        if ( empty ( $_POST[ $this->option ] ) )
        {
            return;
        }

        check_admin_referer( $this->option, "_t5nonce-$this->option" );
        set_theme_mod( $this->option, $_POST[ $this->option ] );
    }

    /**
     * Create the form elements.
     *
     * @wp-hook admin_footer-appearance_page_custom-background
     * @return void
     */
    public function form()
    {
        $nonce = wp_nonce_field(
            $this->option,
            "_t5nonce-$this->option",
            TRUE, // check referer
            FALSE // do not echo
            );
        $html = $nonce . $this->get_radio_fields();
        $this->print_script( $html );
    }

    /**
     * Create the jQuery function that inserts our form fields.
     *
     * @param  string $html Radio buttons
     * @return void
     */
    protected function print_script( $html )
    {
        $row = "'<tr><th>$this->table_header</th><td>$html</td></tr>'";
        ?>
<script>jQuery( function <?php echo $this->option; ?>($) {
    $('.form-table:last').append(<?php echo $row; ?>);
});</script>
<?php
    }

    /**
     * Helper for form(). Create radio input fields
     *
     * @return string
     */
    protected function get_radio_fields()
    {
        $value  = get_theme_mod( $this->option, 'padding-box' );
        $radios = array ( 'padding-box', 'border-box', 'content-box' );
        $html   = "<p>";

        foreach ( $radios as $radio )
        {
            $html .= sprintf(
                ' <input type="radio" name="%1$s" value="%2$s" id="%3$s"%4$s>'
                . ' <label for="%3$s">%2$s</label> ',
                $this->option,
                $radio,
                "$this->option-$radio",
                // returns ' as value delimiters and has to be escaped
                addslashes( checked( $value, $radio, FALSE ) )
            );
        }

        return "$html</p>";
    }
}

Ich fand die Antwort von @toscho sehr nützlich, aber da ich mehr als eine Option zum Hinzufügen hatte, habe ich den Code ein wenig geändert, sodass ich nur eine einfache erweiterte Klasse mit einigen Optionen erstellen muss.

Ich fand es auch unpraktisch, die Optionen einfach am Ende der Liste hinzuzufügen, daher habe ich ein 'Position'-Argument hinzugefügt, mit dem Sie eine dieser Optionen auswählen können -

• 'first' - Vor der ersten Einstellung (aktuell Position)
• 'last'- Nach der letzten Einstellung (aktuelle Hintergrundfarbe)
• Integer position - Die Zeilennummer, vor der die Einstellung eingefügt werden soll (muss eine Ganzzahl sein).

Hier ist der Code -

add_action('load-appearance_page_custom-background', array('PS_Background_Setting_Random', 'get_instance'));
add_action('load-appearance_page_custom-background', array('PS_Background_Setting_Position_Y', 'get_instance'));
add_action('load-appearance_page_custom-background', array('PS_Background_Setting_Size', 'get_instance'));

/**
 * Add a new 'Random Background' setting to the Customise Background admin page
 */
final class PS_Background_Setting_Random extends PS_Background_Setting{

    /**
     * The main instance
     *
     * @var object|null
     */
    protected static $instance = null;

    /**
     * Return an instance of this class
     *
     * @return object   An instance of this class
     */
    public static function get_instance(){

        NULL === self::$instance and self::$instance = new self;
        return self::$instance;

    }

    /**
     * Constructor
     */
    public function __construct(){

        $args = array(
            'mod'       => 'ps_background_random',
            'default'   => 'yes',
            'label'     => __('Random Background', 'djg_photo_show'),
            'position'  => 'first',
            'options'   => array(
                'yes'   => __('Yes', 'djg_photo_show'),
                'no'    => __('No', 'djg_photo_show')
            )
        );

        parent::__construct($args);

    }

}

/**
 * Add a new 'Background Position (Y)' setting to the Customise Background admin page
 */
final class PS_Background_Setting_Position_Y extends PS_Background_Setting{

    /**
     * The main instance
     *
     * @var object|null
     */
    protected static $instance = null;

    /**
     * Return an instance of this class
     *
     * @return object   An instance of this class
     */
    public static function get_instance(){

        NULL === self::$instance and self::$instance = new self;
        return self::$instance;

    }

    /**
     * Constructor
     */
    public function __construct(){

        $args = array(
            'mod'       => 'ps_background_position_y',
            'default'   => 'cover',
            'label'     => __('Position (Y)', 'djg_photo_show'),
            'position'  => 3,
            'options'   => array(
                'top'       => __('Top', 'djg_photo_show'),
                'center'    => __('Centre', 'djg_photo_show'),
                'bottom'    => __('Bottom', 'djg_photo_show')
            )
        );

        parent::__construct($args);

    }

}

/**
 * Add a new 'Background Size' setting to the Customise Background admin page
 */
final class PS_Background_Setting_Size extends PS_Background_Setting{

    /**
     * The main instance
     *
     * @var object|null
     */
    protected static $instance = null;

    /**
     * Return an instance of this class
     *
     * @return object   An instance of this class
     */
    public static function get_instance(){

        NULL === self::$instance and self::$instance = new self;
        return self::$instance;

    }

    /**
     * Constructor
     */
    public function __construct(){

        $args = array(
            'mod'       => 'ps_background_size',
            'default'   => 'cover',
            'label'     => __('Size', 'djg_photo_show'),
            'position'  => 6,
            'options'   => array(
                'auto'      => __('Auto', 'djg_photo_show'),
                'contain'   => __('Contain', 'djg_photo_show'),
                'cover'     => __('Cover', 'djg_photo_show')
            )
        );

        parent::__construct($args);

    }

}

/**
 * Add a new setting to the Customise Background admin page
 */
class PS_Background_Setting{

    /**
     * The name for the theme modification option
     *
     * @var string
     */
    private $mod = '';

    /**
     * The default value to return if $mod is not yet set
     *
     * @var mixed
     */
    private $default = false;

    /**
     * The label for the additional setting
     *
     * @var string
     */
    private $label = '';

    /**
     * The options to use for creating the fields for the additional setting
     *
     * @var array
     */
    private $options = array();

    /**
     * The nonce for the additional setting
     *
     * @var string
     */
    private $nonce;

    /**
     * The HTML fields for all of the options for the additional setting
     *
     * @var string
     */
    private $fields;

    /**
     * The position in which to insert the option
     *
     * @var string
     */
    private $position = 'last';

    /**
     * Constructor
     */
    public function __construct($args = array()){

        /** Map the args to this object */
        foreach($args as $key => $value) :
            $this->$key = $value;
        endforeach;

        /** Ensure that all of the required $args are valid */
        if(!$this->is_valid_args()) :
            return;
        endif;

        add_action('admin_footer-appearance_page_custom-background', array($this, 'output_additional_setting'));

        /** Check to see if there is an option to save */
        if(!empty($_POST[$this->mod])):

            /** Check the nonce is valid and save the updated setting */
            check_admin_referer($this->mod, "_ps_nonce-$this->mod");
            set_theme_mod($this->mod, $_POST[$this->mod]);

        endif;

    }

    /**
     * Ensure that all of the required $args are valid
     */
    private function is_valid_args(){

        return (empty($this->mod) || empty($this->label) || empty($this->options)) ? false : true;

    }

    /**
     * Output the additional custom fields to the custom backgrounds page
     */
    public function output_additional_setting(){

        $this->nonce = wp_nonce_field(  // Create a nonce for each settings so that it can be checked when the user saves
            $this->mod,             // The nonce $action
            "_ps_nonce-$this->mod", // The nonce $name
            true,                   // Also create a referer nonce
            false                   // Do not echo
        );
        $this->set_fields();    // Set up the fields for this setting
        $this->print_script();  // Print the jQuery that will insert the setting into the DOM

    }

    /**
     * Create the HTML fileds for all of the options required for the additional setting
     *
     * @return string   The fields for the additional setting
     */
    private function set_fields(){

        $saved_value = get_theme_mod($this->mod, $this->default);

        foreach($this->options as $value => $description) :

            $checked = ($value === $saved_value) ? 'checked="true"' : false;

            $fields[] = sprintf(
                '<label>'.
                '<input type="radio" id="%1$s" name="%2$s" value="%3$s" %4$s>'.
                '%5$s</label> ',
                "$this->mod-$key",  /** %1$s - The option ID */
                $this->mod,         /** %2$s - The option name */
                $value,             /** %3$s - The option vale */
                $checked,           /** %4$s - Whether or not the option should be checked */
                $description        /** %5$s - The option description */
            );

        endforeach;

        $this->fields = join('', $fields);

    }

    /**
     * Create the $row to insert in to the DOM and the jQuery function to carry out the insertion
     */
    private function print_script(){

        $row = sprintf(
            '<tr>'.
            '<th scope="row">%1$s</th>'.
            '<td><fieldset>'.
            '<legend class="screen-reader-text"><span>Background %1$s</span></legend>'.
            '%2$s%3$s</fieldset></td></tr>',            
            $this->label,   /** %1$s - The setting label */
            $this->nonce,   /** %2$s - The nonce field for this setting */
            $this->fields   /** %3$s - The setting fields */
        );

        if(!is_int($this->position)) :
            $this->position = (in_array($this->position, array('first', 'last'))) ? $this->position : 'last';
        endif;
?>
<script id="custom-background-mod-<?php echo $this->mod; ?>">jQuery(function <?php echo $this->mod; ?>($){

    /** Insert the '<?php echo $this->mod; ?>' setting option in to the Custom Background admin page */
    var row = '<?php echo $row; ?>';
    var rows = $('.form-table:last tr');
<?php if(is_int($this->position)) : ?>
    var position = parseInt('<?php echo $this->position; ?>');
    if(position < 0){
        rows.first().before(row);
    }
    else if(position > rows.length){
        rows.last().after(row);
    }
    else{
        rows.eq(position - 1).before(row);
    }
<?php elseif($this->position === 'first') : ?>
    $('.form-table:last tr:first').before(row);
<?php else : ?>
    $('.form-table:last tr:last').after(row);
<?php endif; ?>

});</script>
<?php
    }

}