first version

kirby/src/Cms/Form.php

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+<?php
+
+namespace Kirby\Cms;
+
+use Kirby\Form\Form as BaseForm;
+
+/**
+ * Extension of `Kirby\Form\Form` that introduces
+ * a Form::for method that creates a proper form
+ * definition for any Cms Model.
+ */
+class Form extends BaseForm
+{
+    protected $errors;
+    protected $fields;
+    protected $values = [];
+
+    public function __construct(array $props)
+    {
+        $kirby = App::instance();
+
+        if ($kirby->multilang() === true) {
+            $fields            = $props['fields'] ?? [];
+            $isDefaultLanguage = $kirby->language()->isDefault();
+
+            foreach ($fields as $fieldName => $fieldProps) {
+                // switch untranslatable fields to readonly
+                if (($fieldProps['translate'] ?? true) === false && $isDefaultLanguage === false) {
+                    $fields[$fieldName]['unset']    = true;
+                    $fields[$fieldName]['disabled'] = true;
+                }
+            }
+
+            $props['fields'] = $fields;
+        }
+
+        parent::__construct($props);
+    }
+
+    public static function for(Model $model, array $props = [])
+    {
+        // get the original model data
+        $original = $model->content()->toArray();
+
+        // set a few defaults
+        $props['values'] = array_merge($original, $props['values'] ?? []);
+        $props['fields'] = $props['fields'] ?? [];
+        $props['model']  = $model;
+
+        // search for the blueprint
+        if (method_exists($model, 'blueprint') === true && $blueprint = $model->blueprint()) {
+            $props['fields'] = $blueprint->fields();
+        }
+
+        $ignoreDisabled = $props['ignoreDisabled'] ?? false;
+
+        // REFACTOR: this could be more elegant
+        if ($ignoreDisabled === true) {
+            $props['fields'] = array_map(function ($field) {
+                $field['disabled'] = false;
+                return $field;
+            }, $props['fields']);
+        }
+
+        return new static($props);
+    }
+}