PHP design mode decorator mode, PHP design mode _php Tutorial

PHP design mode decorator mode, PHP design mode

Decorator mode, you can dynamically add the ability to modify the class.

A class provides a feature that, if you want to modify and add additional functionality, the traditional programming pattern requires writing a subclass to inherit it and re-implement the method of the class. With adorner mode, you only need to add an adorner object at run time for maximum flexibility.

drawdecorator. php

 
  Phpnamespace Baobab; /*  */interface  drawdecorator{    function  beforedraw ()    ; function Afterdraw ();}

Canvas. php

 Phpnamespace Baobab;
/**
*canvas class, drawing graphics
**/
classcanvas{ Public $data;  protected $decorators = array(); //Decorator    functionInit$width= 20,$height= 10)    {        $data=Array();  for($i= 0;$i<$height;$i++)        {             for($j= 0;$j<$width;$j++)            {                $data[$i][$j] = '*'; }        }        $this->data =$data; }     function adddecorator (drawdecorator $decorator) {  $this->decorators[] = c5> $decorator; }  function  beforedraw () {  foreach($this->decorators  as c12> $decorator) {  $decorator, Beforedraw (); }}  function  afterdraw () {  $decorators = array_reverse(  $this, decorators);  foreach($decorators  as $decorator) {  $decorato R--Afterdraw (); } } functionDraw () { $this-Beforedraw (); foreach($this->data as $line)        {            foreach($line  as $char)            {                Echo $char; }            Echo"
\ n "; }         $this Afterdraw (); }    functionRect$a 1,$a 2,$b 1,$b 2)    {        foreach($this->data as $k 1=$line)        {            if($k 1<$a 1Or$k 1>$a 2)Continue; foreach($line  as $k 2=$char)            {                if($k 2<$b 1Or$k 2>$b 2)Continue; $this->data[$k 1][$k 2] = ' '; }        }    }}

colordrawdecorator. php

 
  Phpnamespace Baobab; /**
* Decorator to modify the color of the graphic
*/ class Implements \baobab\drawdecorator{    protected$color;     function __construct ($color = ' Black ') {        $this$color ;    }     function Beforedraw () {        echo ' $this->color}; ' > ";    }
    function Afterdraw () {        echo "";    }}

sizedrawdecorator. php

 
  Phpnamespace Baobab; /**
* Decorator to modify the size of the graphic
*/ class Implements \baobab\drawdecorator{    protected$size;     function __construct ($size = ' 12px ') {        $this$size  ;    }     function Beforedraw ()    {        echo ' $this->size}; ' > ";    }
    function Afterdraw ()    {        echo "";    }}

index.php

$canvas New Baobab\canvas (); $canvas, init (); $canvas->rect (3, 6,4,12); $canvas->adddecorator (new \baobab\colordrawdecorator (' Blue ')); $canvas->adddecorator (new \baobab\sizedrawdecorator (' 10px '));
......
Additional adorners can be added
$canvas->draw ();

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