修饰器模式

骑猪看日落 2021-12-16 15:19 188阅读 0赞

// 装饰器接口
    interface Decorator
    {
        function beforeDecorator();
        function afterDecorator();
    }
    
    // 改变颜色的装饰器
    class ColorDecorator implements Decorator
    {
        function __construct( $color="red" )
        {
            $this->color = $color;
        }
        function beforeDecorator()
        {
            echo "<div style='color:{
        $this->color}'>";
        }
        function afterDecorator()
        {
            echo '<div>';
        }
    }
    
    // 改变字体大小的装饰器
    class SizeDecorator implements Decorator
    {
        function __construct( $size="12px" )
        {
            $this->size = $size;
        }
        // 代码之前插入
        function beforeDecorator()
        {
            echo "<div style='font-size:{
        $this->size}'>";
        }
        // 代码之后插入
        function afterDecorator()
        {
            echo '<div>';
        }
    }
    
    class Test
    {
        protected $decorators = array();
    
        function index()
        {
            $this->befor();
                echo '这是一个装饰器模式的小栗子';
            $this->after();
        }
    
        function befor()
        {
            foreach ($this->decorators as $key => $decorator) {
                $decorator->beforeDecorator();
            }
        }
    
        function after()
        {
            $this->decorators = array_reverse($this->decorators);
            foreach ($this->decorators as $key => $decorator) {
                $decorator->afterDecorator();
            }
        }
    
        function addDecorator( $decorator )
        {
            $this->decorators[] = $decorator;
        }
    }
    
    $test = new Test();
    $test->addDecorator( new ColorDecorator('blue') );
    $test->addDecorator( new SizeDecorator('24px') );
    $test->index();

转载于:https://www.cnblogs.com/JiangBigShrimp/p/11123071.html