dnadesign / silverstripe-elemental

src/Forms/ElementalAreaField.php

<?php

namespace DNADesign\Elemental\Forms;

use BlocksPage;
use DNADesign\Elemental\Controllers\ElementalAreaController;
use DNADesign\Elemental\Models\BaseElement;
use DNADesign\Elemental\Models\ElementalArea;
use DNADesign\Elemental\Services\ElementTabProvider;
use SilverStripe\Control\Controller;
use SilverStripe\Core\Config\Config;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Forms\CompositeField;
use SilverStripe\Forms\FieldGroup;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\FormField;
use SilverStripe\Forms\GridField\GridField;
use SilverStripe\Forms\TabSet;
use SilverStripe\ORM\DataObjectInterface;
use Symbiote\GridFieldExtensions\GridFieldAddNewMultiClass;

class ElementalAreaField extends GridField
{
    /**
     * @var ElementalArea $area
     */
    protected $area;

    /**
     * @var array $type
     */
    protected $types = [];

    /**
     * @var null
     */
    protected $inputType = null;

    protected $modelClassName = BaseElement::class;

    /**
     * @param string $name
     * @param ElementalArea $area
     * @param string[] $blockTypes
     */
    public function __construct($name, ElementalArea $area, array $blockTypes)
    {
        $this->setTypes($blockTypes);

        $config = new ElementalAreaConfig();

        if (!empty($blockTypes)) {
            /** @var GridFieldAddNewMultiClass $adder */
            $adder = Injector::inst()->create(GridFieldAddNewMultiClass::class);
            $adder->setClasses($blockTypes);
            $config->addComponent($adder);
        }

        // By default, no need for a title on the editor. If there is more than one area then use `setTitle` to describe
        parent::__construct($name, '', $area->Elements(), $config);

It seems like $area->Elements() can also be of type DNADesign\Elemental\Models\BaseElement[]; however, parameter $dataList of SilverStripe\Forms\GridField\GridField::__construct() does only seem to accept SilverStripe\ORM\SS_List|null, maybe add an additional type check?

        $this->area = $area;

        $this->addExtraClass('element-editor__container no-change-track');
    }

    /**
     * @param array $types
     *
     * @return $this
     */
    public function setTypes($types)
    {
        $this->types = $types;

        return $this;
    }

    /**
     * @return array
     */
    public function getTypes()
    {
        $types = $this->types;

        $this->extend('updateGetTypes', $types);

        return $types;
    }

    /**
     * @return ElementalArea
     */
    public function getArea()
    {
        return $this->area;
    }

    /**
     * Overloaded to skip GridField implementation - this is copied from FormField.
     *
     * @param array $properties
     * @return \SilverStripe\ORM\FieldType\DBHTMLText|string
     */
    public function FieldHolder($properties = array())
    {
        $context = $this;

        if (count($properties)) {
            $context = $this->customise($properties);
        }

        return $context->renderWith($this->getFieldHolderTemplates());
    }

    public function getSchemaDataDefaults()
    {
        $schemaData = parent::getSchemaDataDefaults();

        $area = $this->getArea();
        $pageId = ($area && ($page = $area->getOwnerPage())) ? $page->ID : null;
        $schemaData['page-id'] = $pageId;
        $schemaData['elemental-area-id'] = $area ? (int) $area->ID : null;

        $allowedTypes = $this->getTypes();
        $schemaData['allowed-elements'] = array_keys($allowedTypes);

        return $schemaData;
    }

    /**
     * A getter method that seems redundant in that it is a function that returns a function,
     * however the returned closure is used in an array map function to return a complete FieldList
     * representing a read only view of the element passed in (to the closure).
     *
     * @return callable
     */
    protected function getReadOnlyBlockReducer()
    {
        return function (BaseElement $element) {
            $parentName = 'Element' . $element->ID;
            $elementFields = $element->getCMSFields();

            // Obtain highest impact fields for a summary (e.g. Title & Content)
            foreach ($elementFields as $field) {
                if (is_object($field) && $field instanceof TabSet) {
                    // Assign the fields of the first Tab in the TabSet - most regularly 'Root.Main'
                    $elementFields = $field->FieldList()->first()->FieldList();
                    break;
                }
            }

            // Set values (before names don't match anymore)
            $elementFields->setValues($element->getQueriedDatabaseFields());

            // Combine into an appropriately named group
            $elementGroup = FieldGroup::create($elementFields);
            $elementGroup->setForm($this->getForm());
            $elementGroup->setName($parentName);
            $elementGroup->addExtraClass('elemental-area__element--historic');

            // Also set the important data for the rendering Component
            $elementGroup->setSchemaData([
                'data' => [
                    'ElementID' => $element->ID,
                    'ElementType' => $element->getType(),
                    'ElementIcon' => $element->config()->get('icon'),
                    'ElementTitle' => $element->Title,
                    // @todo: Change this to block history permalink when that functionality becomes available.
                    'ElementEditLink' => Controller::join_links(
                        // Always get the edit link for the block directly, not the in-line edit form if supported
                        $element->CMSEditLink(true),
                        // @todo make this auto-permalinking work somehow
                        '#Root_History'
                    ),
                ],
            ]);

            return $elementGroup;
        };
    }

    /**
     * Provides a readonly representation of the GridField (superclass) Uses a reducer
     * {@see ElementalAreaField::getReadOnlyBlockReducer()} to fetch a read only representation of the listed class
     * {@see GridField::getModelClass()}
     *
     * @return CompositeField
     */
    public function performReadonlyTransformation()
    {
        /** @var CompositeField $readOnlyField */
        $readOnlyField = $this->castedCopy(CompositeField::class);
        $blockReducer = $this->getReadOnlyBlockReducer();
        $readOnlyField->setChildren(
            FieldList::create(array_map($blockReducer, $this->getArea()->Elements()->toArray()))
        );

        $readOnlyField = $readOnlyField->performReadonlyTransformation();

        // Ensure field names are unique between elements on parent form but only after transformations have been
        // performed
        /** @var FieldGroup $elementForm */
        foreach ($readOnlyField->getChildren() as $elementForm) {
            $parentName = $elementForm->getName();
            $elementForm->getChildren()->recursiveWalk(function (FormField $field) use ($parentName) {
                $field->setName($parentName . '_' . $field->getName());
            });
        }

        return $readOnlyField
            ->setReadOnly(true)
            ->setName($this->getName())
            ->addExtraClass('elemental-area--read-only');
    }

    public function setSubmittedValue($value, $data = null)
    {
        // Content comes through as a JSON encoded list through a hidden field.
        return $this->setValue(json_decode($value, true));
    }

    public function saveInto(DataObjectInterface $dataObject)
    {
        /** @var BlocksPage $dataObject */
        parent::saveInto($dataObject);

        $elementData = $this->Value();
        $idPrefixLength = strlen(sprintf(ElementalAreaController::FORM_NAME_TEMPLATE, ''));

        if (!$elementData) {
            return;
        }

        foreach ($elementData as $form => $data) {
            // Extract the ID
            $elementId = (int) substr($form, $idPrefixLength);

            /** @var BaseElement $element */
            $element = $this->getArea()->Elements()->byID($elementId);

            if (!$element) {
                // Ignore invalid elements
                continue;
            }

            $data = ElementalAreaController::removeNamespacesFromFields($data, $element->ID);

            $element->updateFromFormData($data);
            $element->write();
        }
    }
}