New widgetGroup->wrap() method

README.md

@@ -323,8 +323,16 @@ equals
 
 `Widget::group('sidebar')->position(100)->addWidget('files');`
 
-You can also set a separator to display between widgets in a group.
-`Widget::group('sidebar')->setSeparator('<hr>');` 
+You can set a separator that will be display between widgets in a group.
+`Widget::group('sidebar')->setSeparator('<hr>')->...;`
+
+You can also wrap each widget in a group using `wrap` method like that.
+```php
+Widget::group('sidebar')->wrap(function ($content, $index, $total) {
+    // $total is a total number of widgets in a group.
+    return "<div class='widget-{$index}'>{$content}</div>";
+})->...;
+```
 
 ### Checking the state of a widget group
 

src/WidgetGroup.php

@@ -51,6 +51,13 @@ class WidgetGroup
      */
     protected $count = 0;
 
+    /**
+     * A callback that defines extra markup that wraps every widget in the group.
+     *
+     * @var callable
+     */
+    protected $wrapCallback;
+
     /**
      * @param $name
      * @param ApplicationWrapperContract $app
@@ -72,12 +79,12 @@ public function display()
         ksort($this->widgets);
 
         $output = '';
-        $count = 0;
+        $index = 0;
         foreach ($this->widgets as $position => $widgets) {
             foreach ($widgets as $widget) {
-                $count++;
-                $output .= $this->displayWidget($widget);
-                if ($this->count !== $count) {
+                $output .= $this->performWrap($this->displayWidget($widget), $index, $this->count);
+                $index++;
+                if ($this->count !== $index) {
                     $output .= $this->separator;
                 }
             }
@@ -119,7 +126,7 @@ public function addAsyncWidget()
     /**
      * Getter for position.
      *
-     * @return array
+     * @return int
      */
     public function getPosition()
     {
@@ -140,6 +147,20 @@ public function setSeparator($separator)
         return $this;
     }
 
+    /**
+     * Setter for $this->wrapCallback.
+     *
+     * @param callable $callable
+     *
+     * @return $this
+     */
+    public function wrap(callable $callable)
+    {
+        $this->wrapCallback = $callable;
+
+        return $this;
+    }
+
     /**
      * Check if there are any widgets in the group.
      *
@@ -219,4 +240,24 @@ protected function resetPosition()
     {
         $this->position = 100;
     }
+
+    /**
+     * Wraps widget content in a special markup defined by $this->wrap().
+     *
+     * @param string $content
+     * @param int $index
+     * @param int $total
+     *
+     * @return string
+     */
+    protected function performWrap($content, $index, $total)
+    {
+        if (is_null($this->wrapCallback)) {
+            return $content;
+        }
+
+        $callback = $this->wrapCallback;
+
+        return $callback($content, $index, $total);
+    }
 }

tests/WidgetGroupTest.php

@@ -94,6 +94,29 @@ public function testSeparator()
             '</div>', $output);
     }
 
+    public function testWrap()
+    {
+        $this->widgetGroup->addWidget('Slider', ['slides' => 5]);
+        $this->widgetGroup->addAsyncWidget('Slider');
+
+        $output = $this->widgetGroup->wrap(function($content, $index, $count) {
+            return "<div class='widget widget-{$index}-{$count}'>{$content}</div>";
+        })->display();
+
+        $this->assertEquals(
+            '<div class=\'widget widget-0-2\'>Slider was executed with $slides = 5 foo: bar</div>'.
+            '<div class=\'widget widget-1-2\'><div id="arrilot-widget-container-2" style="display:inline" class="arrilot-widget-container">Placeholder here!'.
+                '<script type="text/javascript">'.
+                    'var widgetTimer2 = setInterval(function() {'.
+                        'if (window.$) {'.
+                            "$('#arrilot-widget-container-2').load('".$this->ajaxUrl('Slider', [], 2)."');".
+                            'clearInterval(widgetTimer2);'.
+                        '}'.
+                    '}, 100);'.
+                '</script>'.
+            '</div></div>', $output);
+    }
+
     public function testIsEmpty()
     {
         $this->assertTrue($this->widgetGroup->isEmpty());