Decorator Pattern

最新推荐文章于 2025-03-24 15:13:29 发布

hahaliu005

最新推荐文章于 2025-03-24 15:13:29 发布

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分类专栏： php 文章标签： decorator function class input email build

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本文通过一个具体的PHP示例，展示了装饰者模式的应用。该模式允许在不改变对象结构的前提下动态地给对象添加新的职责。

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The code below collate from the book named PHP pattern , this may be useful when study decorator pattern:

<?php class Widget { function paint() { return $this->_asHtml (); } } class TextInput extends Widget { var $name; var $value; function TextInput($name, $value = '') { $this->name = $name; $this->value = $value; } function _asHtml() { return '<input type="text" name="' . $this->name . '" value="' . $this->value . '">'; } } class WidgetDecorator { var $widget; function WidgetDecorator(&$widget) { $this->widget = & $widget; } function paint() { return $this->widget->paint (); } } class Labeled extends WidgetDecorator { var $label; function Labeled($label, &$widget) { $this->label = $label; $this->WidgetDecorator ( $widget ); } function paint() { return '<b>' . $this->label . ':</b> ' . $this->widget->paint (); } } class FormHandler { function build(&$post) { return array (new Labeled ( 'First Name', new TextInput ( 'fname', $post->get ( 'fname' ) ) ), new Labeled ( 'Last Name', new TextInput ( 'lname', $post->get ( 'lname' ) ) ), new Labeled ( 'Email', new TextInput ( 'email', $post->get ( 'email' ) ) ) ); } function validate(&$form, &$post) { $valid = true; // first name required if (! strlen ( $post->get ( 'fname' ) )) { $form [0] = & new Invalid ( $form [0] ); $valid = false; } // last name required if (! strlen ( $post->get ( 'lname' ) )) { $form [1] = & new Invalid ( $form [1] ); $valid = false; } // email has to look real if (! preg_match ( '~/w+@(/w+/.)+/w+~', $post->get ( 'email' ) )) { $form [2] = & new Invalid ( $form [2] ); $valid = false; } return $valid; } } class Post { var $store = array (); function get($key) { if (array_key_exists ( $key, $this->store )) return $this->store [$key]; } function set($key, $val) { $this->store [$key] = $val; } function &autoFill() { $ret = & new Post (); foreach ( $_POST as $key => $value ) { $ret->set ( $key, $value ); } return $ret; } } class Invalid extends WidgetDecorator { function paint() { return '<span class="invalid">'.$this->widget->paint().'</span>'; } } ?> <html> <head> <title>Decorator Example</title> <mce:style type="text/css"></mce:style><style type="text/css" mce_bogus="1">.invalid { color: red; } .invalid input { background-color: red; color: yellow; } #myform input { position: absolute; left: 110px; width: 250px; font-weight: bold; }</style> </head> <body> <form action="<?php echo $_SERVER [PHP_SELF]; ?>" method="post"> <div id="myform"> <?php error_reporting ( E_ALL ); $post = & Post::autoFill (); $form = FormHandler::build ( $post ); if ($_POST) { FormHandler::validate ( $form, $post ); } foreach ( $form as $widget ) { echo $widget->paint (), "<br>/n"; } ?> </div> <input type="submit" value="Submit"></form> </body> </html>