changing interface to improve rendering

Composite/Form.php

@@ -28,7 +28,7 @@ class Form extends FormElement
      *
      * @return string
      */
-    public function render()
+    public function render($indent = 0)
     {
         $formCode = '';
         foreach ($this->_elements as $element) {

Composite/FormElement.php

@@ -4,5 +4,5 @@ namespace DesignPatterns\Composite;
 
 abstract class FormElement
 {
-    abstract public function render();
+    abstract public function render($indent = 0);
 }

Composite/InputElement.php

@@ -4,7 +4,7 @@ namespace DesignPatterns\Composite;
 
 class InputElement extends FormElement
 {
-    public function render()
+    public function render($indent = 0)
     {
         return '<input type="text" />';
     }

Composite/TextElement.php

@@ -4,7 +4,7 @@ namespace DesignPatterns\Composite;
 
 class TextElement extends FormElement
 {
-    public function render()
+    public function render($indent = 0)
     {
         return 'this is a text element';
     }