Complex classes like Widget often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Widget, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 14 | abstract class Widget { |
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| 15 | /** |
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| 16 | * Widget admin label |
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| 17 | * @var string |
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| 18 | */ |
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| 19 | protected $widget_label = ''; |
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| 20 | |||
| 21 | /** |
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| 22 | * Widget description, shown on the "+ Add Widget" picker |
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| 23 | * @var string |
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| 24 | */ |
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| 25 | protected $widget_description = ''; |
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| 26 | |||
| 27 | /** |
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| 28 | * Widget details, shown in the widget lightbox |
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| 29 | * @since 1.8 |
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| 30 | * @var string |
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| 31 | */ |
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| 32 | protected $widget_subtitle = ''; |
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| 33 | |||
| 34 | /** |
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| 35 | * Widget admin ID |
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| 36 | * @var string |
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| 37 | */ |
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| 38 | protected $widget_id = ''; |
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| 39 | |||
| 40 | /** |
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| 41 | * Default configuration for header and footer |
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| 42 | * @var array |
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| 43 | */ |
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| 44 | protected $defaults = array(); |
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| 45 | |||
| 46 | /** |
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| 47 | * Widget admin advanced settings |
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| 48 | * @var array |
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| 49 | */ |
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| 50 | protected $settings = array(); |
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| 51 | |||
| 52 | /** |
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| 53 | * Allow class to automatically add widget_text filter for you in shortcode |
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| 54 | * @var string |
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| 55 | */ |
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| 56 | protected $shortcode_name; |
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| 57 | |||
| 58 | /** |
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| 59 | * Hold the widget options. |
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| 60 | * @var array() |
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| 61 | */ |
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| 62 | private $widget_options = array(); |
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| 63 | |||
| 64 | /** |
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| 65 | * The position of the widget. |
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| 66 | * @api |
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| 67 | * @since 2.0 |
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| 68 | * @var string |
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| 69 | */ |
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| 70 | public $position = ''; |
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| 71 | |||
| 72 | /** |
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| 73 | * A unique ID for this widget. |
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| 74 | * @api |
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| 75 | * @since 2.0 |
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| 76 | * @var string |
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| 77 | */ |
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| 78 | public $UID = ''; |
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| 79 | |||
| 80 | /** |
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| 81 | * The actual configuration for this widget instance. |
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| 82 | * |
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| 83 | * @api |
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| 84 | * @since 2.0 |
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| 85 | * @var \GV\Settings |
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| 86 | */ |
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| 87 | public $configuration; |
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| 88 | |||
| 89 | /** |
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| 90 | * Constructor. |
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| 91 | * |
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| 92 | * @param string $label The Widget label as shown in the admin. |
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| 93 | * @param string $id The Widget ID, make this something unique. |
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| 94 | * @param array $defaults Default footer/header Widget configuration. |
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| 95 | * @param array $settings Advanced Widget settings. |
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| 96 | * |
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| 97 | * @return \GV\Widget |
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| 98 | */ |
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| 99 | 36 | public function __construct( $label, $id, $defaults = array(), $settings = array() ) { |
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| 137 | |||
| 138 | /** |
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| 139 | * Define general widget settings |
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| 140 | * @since 1.5.4 |
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| 141 | * @return array $settings Default settings |
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| 142 | */ |
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| 143 | 36 | protected function get_default_settings() { |
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| 165 | |||
| 166 | /** |
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| 167 | * Get the Widget ID. |
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| 168 | * |
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| 169 | * @return string The Widget ID. |
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| 170 | */ |
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| 171 | 38 | public function get_widget_id() { |
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| 174 | |||
| 175 | /** |
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| 176 | * Get the widget settings |
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| 177 | * |
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| 178 | * @return array|null Settings array; NULL if not set for some reason. |
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| 179 | */ |
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| 180 | 1 | public function get_settings() { |
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| 183 | |||
| 184 | /** |
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| 185 | * Get a setting by the setting key. |
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| 186 | * |
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| 187 | * @param string $key Key for the setting |
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| 188 | * |
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| 189 | * @todo Use the \GV\Settings class later. For now subclasses may still expect and array instead. |
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| 190 | * |
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| 191 | * @return mixed|null Value of the setting; NULL if not set |
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| 192 | */ |
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| 193 | 1 | public function get_setting( $key ) { |
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| 196 | |||
| 197 | /** |
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| 198 | * Default widget areas. |
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| 199 | * |
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| 200 | * Usually overridden by the selected template. |
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| 201 | * |
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| 202 | * @return array The default areas where widgets can be rendered. |
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| 203 | */ |
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| 204 | 6 | public static function get_default_widget_areas() { |
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| 224 | |||
| 225 | /** |
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| 226 | * Register widget to become available in admin. And for lookup. |
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| 227 | * |
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| 228 | * @param array $widgets Usually just empty. Used to gather them all up. |
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| 229 | * |
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| 230 | * @return array $widgets |
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| 231 | */ |
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| 232 | 36 | public function register_widget( $widgets ) { |
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| 246 | |||
| 247 | /** |
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| 248 | * Assign template specific widget options |
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| 249 | * |
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| 250 | * @access protected |
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| 251 | * |
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| 252 | * @param array $options (default: array()) |
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| 253 | * @param string $template (default: '') |
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| 254 | * |
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| 255 | * @return array |
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| 256 | */ |
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| 257 | 1 | public function assign_widget_options( $options = array(), $template = '', $widget = '' ) { |
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| 265 | |||
| 266 | /** |
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| 267 | * Do shortcode if the Widget's shortcode exists. |
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| 268 | * |
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| 269 | * @param string $text Widget text to check |
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| 270 | * @param null|\WP_Widget Empty if not called by WP_Widget, or a WP_Widget instance |
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| 271 | * |
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| 272 | * @return string Widget text |
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| 273 | */ |
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| 274 | 1 | public function maybe_do_shortcode( $text, $widget = null ) { |
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| 280 | |||
| 281 | /** |
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| 282 | * Add $this->shortcode_name shortcode to output self::render_frontend() |
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| 283 | * |
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| 284 | * @return void |
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| 285 | */ |
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| 286 | 2 | public function add_shortcode() { |
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| 316 | |||
| 317 | /** |
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| 318 | * Frontend logic. |
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| 319 | * |
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| 320 | * Override in child class. |
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| 321 | * |
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| 322 | * @param array $widget_args The Widget shortcode args. |
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| 323 | * @param string $content The content. |
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| 324 | * @param string|\GV\Template_Context $context The context, if available. |
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| 325 | * |
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| 326 | * @return void |
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| 327 | */ |
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| 328 | public function render_frontend( $widget_args, $content = '', $context = '' ) { |
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| 330 | |||
| 331 | /** |
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| 332 | * General validations when rendering the widget |
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| 333 | * |
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| 334 | 4 | * Always call this from your `render_frontend()` override! |
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| 335 | * |
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| 336 | * @return boolean True: render frontend; False: don't render frontend |
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| 337 | */ |
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| 338 | public function pre_render_frontend() { |
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| 372 | |||
| 373 | /** |
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| 374 | * Shortcode. |
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| 375 | * |
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| 376 | * @param array $atts The Widget shortcode args. |
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| 377 | * @param string $content The content. |
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| 378 | 1 | * @param string $context The context, if available. |
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| 379 | 1 | * |
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| 380 | 1 | * @return string Whatever the widget echoed. |
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| 381 | 1 | */ |
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| 382 | public function render_shortcode( $atts, $content = '', $context = '' ) { |
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| 387 | |||
| 388 | /** |
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| 389 | * Create the needed widget from a configuration array. |
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| 390 | * |
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| 391 | * @param array $configuration The configuration array. |
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| 392 | * @see \GV\Widget::as_configuration() |
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| 393 | * @internal |
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| 394 | 35 | * @since 2.0 |
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| 395 | 35 | * |
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| 396 | * @return \GV\Widget|null The widget implementation from configuration or none. |
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| 397 | 35 | */ |
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| 398 | public static function from_configuration( $configuration ) { |
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| 418 | |||
| 419 | /** |
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| 420 | * Return an array of the old format. |
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| 421 | * |
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| 422 | * 'id' => string |
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| 423 | * + whatever else specific fields may have |
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| 424 | * |
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| 425 | * @internal |
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| 426 | 6 | * @since 2.0 |
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| 427 | 6 | * |
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| 428 | 6 | * @return array |
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| 429 | 6 | */ |
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| 430 | public function as_configuration() { |
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| 435 | |||
| 436 | /** |
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| 437 | * Return all registered widgets. |
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| 438 | * |
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| 439 | * @api |
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| 440 | 36 | * @since 2.0 |
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| 441 | * |
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| 442 | * @return array |
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| 443 | */ |
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| 444 | public static function registered() { |
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| 458 | |||
| 459 | /** |
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| 460 | * Whether this Widget's been registered already or not. |
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| 461 | * |
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| 462 | * @api |
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| 463 | 36 | * @since 2.0 |
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| 464 | 36 | * |
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| 465 | * @return bool |
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| 466 | */ |
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| 467 | public function is_registered() { |
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| 474 | } |
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| 475 |
Adding a
@returnannotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.