NEW Extensions for elemental

code/elemental/ElementContentExtension.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Elemental\Extension;
+
+use SilverStripe\Core\Extension;
+use SilverStripe\Forms\FieldList;
+use SilverStripe\ORM\ValidationResult;
+use SilverStripe\Forms\CompositeValidator;
+use SilverStripe\Forms\NumericField;
+use SilverStripe\Forms\RequiredFields;
+use SilverStripe\Forms\TextField;
+
+/**
+ * @extends Extension<ElementContent>
+ */
+class ElementContentExtension extends Extension
+{
+    private static $db = [
+        'MyField' => 'Varchar',
+        'MyInt' => 'Int',
+    ];
+
+    public function validate(ValidationResult $result)
+    {
+        if ($this->owner->Title == 'x') {
+            $result->addFieldError('Title', 'Title cannot be x');
+        }
+        if ($this->owner->MyField == 'x') {
+            $result->addFieldError('MyField', 'MyField cannot be x');
+        }
+        if ($this->owner->Title == 'z' && $this->owner->MyField == 'z') {
+            $result->addError('This is a general error message');
+        }
+    }
+
+    public function updateCMSCompositeValidator(CompositeValidator $compositeValidator)
+    {
+        $compositeValidator->addValidator(new RequiredFields(['Title']));
+    }
+
+    public function updateCMSFields(FieldList $fields)
+    {
+        $fields->removeByName('HTML');
+        $fields->addFieldToTab('Root.Main', TextField::create('MyField', 'My Field'));
+        $fields->addFieldToTab('Root.Main', NumericField::create('MyInt', 'My Int'));
+    }
+}

code/elemental/NumericFieldExtension.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Elemental\Extension;
+
+use SilverStripe\Forms\NumericField;
+use SilverStripe\Core\Extension;
+
+/**
+ * @extends Extension<NumericField>
+ */
+class NumericFieldExtension extends Extension
+{
+    public function updateValidationResult($result, $validator)
+    {
+        if ($this->owner->Value() == 1) {
+            $validator->validationError($this->owner->getName(), 'This field cannot be 1');
+        }
+    }
+}