bug #10591 [Form] Buttons are now disabled if their containing form is disabled (webmozart)

This PR was merged into the 2.3 branch.

Discussion
----------

[Form] Buttons are now disabled if their containing form is disabled

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10109
| License       | MIT
| Doc PR        | -

Commits
-------

ebfee72 [Form] Added test for disabling buttons
6bb355e [Form] Added check for parent disabled status in Button form elements

src/Symfony/Component/Form/Button.php

@@ -321,7 +321,11 @@ class Button implements \IteratorAggregate, FormInterface
      */
     public function isDisabled()
     {
-        return $this->config->getDisabled();
+        if (null === $this->parent || !$this->parent->isDisabled()) {
+            return $this->config->getDisabled();
+        }
+
+        return true;
     }
 
     /**

src/Symfony/Component/Form/ButtonBuilder.php

@@ -252,6 +252,8 @@ class ButtonBuilder implements \IteratorAggregate, FormBuilderInterface
     public function setAttribute($name, $value)
     {
         $this->attributes[$name] = $value;
+
+        return $this;
     }
 
     /**
@@ -260,6 +262,8 @@ class ButtonBuilder implements \IteratorAggregate, FormBuilderInterface
     public function setAttributes(array $attributes)
     {
         $this->attributes = $attributes;
+
+        return $this;
     }
 
     /**
@@ -286,6 +290,8 @@ class ButtonBuilder implements \IteratorAggregate, FormBuilderInterface
     public function setDisabled($disabled)
     {
         $this->disabled = $disabled;
+
+        return $this;
     }
 
     /**
@@ -410,6 +416,8 @@ class ButtonBuilder implements \IteratorAggregate, FormBuilderInterface
     public function setType(ResolvedFormTypeInterface $type)
     {
         $this->type = $type;
+
+        return $this;
     }
 
     /**

src/Symfony/Component/Form/Tests/ButtonTest.php

@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Tests;
+
+use Symfony\Component\Form\ButtonBuilder;
+use Symfony\Component\Form\FormBuilder;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class ButtonTest extends \PHPUnit_Framework_TestCase
+{
+    private $dispatcher;
+
+    private $factory;
+
+    protected function setUp()
+    {
+        $this->dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+        $this->factory = $this->getMock('Symfony\Component\Form\FormFactoryInterface');
+    }
+
+    /**
+     * @dataProvider getDisabledStates
+     */
+    public function testDisabledIfParentIsDisabled($parentDisabled, $buttonDisabled, $result)
+    {
+        $form = $this->getFormBuilder('form')
+            ->setDisabled($parentDisabled)
+            ->getForm();
+
+        $button = $this->getButtonBuilder('button')
+            ->setDisabled($buttonDisabled)
+            ->getForm();
+
+        $button->setParent($form);
+
+        $this->assertSame($result, $button->isDisabled());
+    }
+
+    public function getDisabledStates()
+    {
+        return array(
+            // parent, button, result
+            array(true, true, true),
+            array(true, false, true),
+            array(false, true, true),
+            array(false, false, false),
+        );
+    }
+
+    private function getButtonBuilder($name)
+    {
+        return new ButtonBuilder($name);
+    }
+
+    private function getFormBuilder($name)
+    {
+        return new FormBuilder($name, null, $this->dispatcher, $this->factory);
+    }
+}

src/Symfony/Component/Form/Tests/SimpleFormTest.php

@@ -170,34 +170,28 @@ class SimpleFormTest extends AbstractFormTest
         $this->assertFalse($child->isRequired());
     }
 
-    public function testAlwaysDisabledIfParentDisabled()
+    /**
+     * @dataProvider getDisabledStates
+     */
+    public function testAlwaysDisabledIfParentDisabled($parentDisabled, $disabled, $result)
     {
-        $parent = $this->getBuilder()->setDisabled(true)->getForm();
-        $child = $this->getBuilder()->setDisabled(false)->getForm();
+        $parent = $this->getBuilder()->setDisabled($parentDisabled)->getForm();
+        $child = $this->getBuilder()->setDisabled($disabled)->getForm();
 
         $child->setParent($parent);
 
-        $this->assertTrue($child->isDisabled());
+        $this->assertSame($result, $child->isDisabled());
     }
 
-    public function testDisabled()
+    public function getDisabledStates()
     {
-        $parent = $this->getBuilder()->setDisabled(false)->getForm();
-        $child = $this->getBuilder()->setDisabled(true)->getForm();
-
-        $child->setParent($parent);
-
-        $this->assertTrue($child->isDisabled());
-    }
-
-    public function testNotDisabled()
-    {
-        $parent = $this->getBuilder()->setDisabled(false)->getForm();
-        $child = $this->getBuilder()->setDisabled(false)->getForm();
-
-        $child->setParent($parent);
-
-        $this->assertFalse($child->isDisabled());
+        return array(
+            // parent, button, result
+            array(true, true, true),
+            array(true, false, true),
+            array(false, true, true),
+            array(false, false, false),
+        );
     }
 
     public function testGetRootReturnsRootOfParent()