WIP: nullable colour input field

src/Forms/NullableColorField.php

@@ -0,0 +1,240 @@
+<?php
+
+namespace Codem\Utilities\HTML5;
+
+use Silverstripe\Forms\CheckboxField;
+use Silverstripe\Forms\CompositeField;
+use Silverstripe\Forms\ReadonlyField;
+use Silverstripe\Forms\FieldList;
+use SilverStripe\ORM\DataObjectInterface;
+
+/**
+ * Provides a composite field that adds a colour field
+ * and a checkbox to set an option for "no colour provided"
+ *
+ * Use this field if you allow a "no colour selection" option
+ */
+class NullableColorField extends CompositeField
+{
+
+
+    /**
+     * @var ColorField|null
+     */
+    protected $colourField = null;
+
+    /**
+     * @var ColorField|null
+     */
+    protected $checkboxField = null;
+
+    /**
+     * @var string
+     */
+    protected $checkboxLabel = '';
+
+    /**
+     * @var array
+     */
+    protected $colourValue = [];
+
+    /**
+     * @var bool
+     */
+    protected $isSubmittingValue = false;
+
+    /**
+     * Nullable Colour Field creation
+     *
+     * @param string $name
+     * @param string $title
+     * @param string $value
+     */
+    public function __construct($name, $title = null, $value = null)
+    {
+
+        // Base setup before buildFields is called
+        $this->setName($name);
+        $this->setTitle($title);
+        $this->setValue($value);
+
+        $this->children = $this->buildFields();
+        parent::__construct($this->children);
+
+        // Ensure name/title set after main field created
+        $this->setName($name);
+        $this->setTitle($title);
+    }
+
+    /**
+     * Return a prefixed field name
+     */
+    public function getPrefixedFieldName(string $suffix) : string {
+        $fieldName = $this->getName() . "[{$suffix}]";
+        return $fieldName;
+    }
+
+    /**
+     * Get the checkbox field
+     */
+    public function getCheckboxField() : CheckboxField {
+        return $this->checkboxField;
+    }
+
+    /**
+     * Get the colour field
+     */
+    public function getColourField() : ColorField {
+        return $this->colourField;
+    }
+
+    /**
+     * This field has data
+     */
+    public function hasData()
+    {
+        return true;
+    }
+
+    /**
+     * @inheritdoc
+     * @param array $value
+     */
+    public function setSubmittedValue($value, $data = null)
+    {
+        $this->isSubmittingValue = true;
+        return parent::setSubmittedValue($value, $data);
+    }
+
+    /**
+     * @inheritdoc
+     * When Form::loadDataFrom() is called, the value is set, child fields need to be set
+     * when this occurs
+     */
+    public function setValue($value, $data = null)
+    {
+        $noValue = true;
+        $colourValue = '';
+        if(is_array($value)) {
+            // value is being submitted
+            $this->isSubmittingValue = true;
+            $colourValue = isset($value['colour']) && is_string($value['colour']) ? $value['colour'] : '';
+            $noValue = isset($value['none']) && $value['none'] == 1;
+        } else if(is_string($value)) {
+            $colourValue = $value;
+            $noValue = ($colourValue == '');
+        }
+
+        // Determine setting of value
+        if($noValue) {
+            $colourValue = '';
+        }
+
+        $this->colourValue = [
+            'colour' => $colourValue,
+            'none' => $noValue ? 1 : 0
+        ];
+
+        // Create fields with the values found
+        $this->buildFields();
+
+        return parent::setValue($value, $data);
+    }
+
+    /**
+     * Create fields and return them
+     * Note that setValue sets colourValue
+     */
+    protected function buildFields() : FieldList {
+
+        // set up colour field
+        $this->colourField = ColourField::create(
+            $this->getPrefixedFieldName('colour'),
+            '', // title is set on the main field not the colour field
+             $this->colourValue['colour']
+        );
+
+        // set up checkbox field
+        $this->checkboxField = CheckboxField::create(
+            $this->getPrefixedFieldName('none'),
+            _t(
+                'Codem\\Utilities\\HTML5\\NullableColorField.NO_COLOUR_LABEL',
+                'None'
+            ),
+            $this->colourValue['none']
+        );
+
+        $fields = FieldList::create(
+            $this->colourField,
+            $this->checkboxField
+        );
+
+        return $fields;
+    }
+
+    /**
+     * Save the data value into the record
+     * @inheritdoc
+     */
+    public function saveInto(DataObjectInterface $record)
+    {
+        $dataValue = $this->dataValue();
+        return parent::saveInto($record);
+    }
+
+    /**
+     * Get the data value, which will either be null, if no string is
+     */
+    public function dataValue() {
+        $noValue = $this->checkboxField->dataValue();
+        $colourValue = $this->colourField->dataValue();
+        if($noValue == 1) {
+            $this->value = "";
+        } else {
+            $this->value = $colourValue;
+        }
+        return $this->value;
+    }
+
+    /**
+     * @inheritdoc
+     * Set child fields to be disabled as well
+     */
+    public function setDisabled($disabled)
+    {
+        foreach($this->children as $child) {
+            $child->setDisabled($disabled);
+        }
+        return parent::setDisabled($disabled);
+    }
+
+    /**
+     * @inheritdoc
+     * Set child fields to be readonly as well
+     */
+    public function setReadonly($readonly)
+    {
+        foreach($this->children as $child) {
+            $child->setReadonly($readonly);
+        }
+        return parent::setReadonly($readonly);
+    }
+
+    /**
+     * The readonly version of this field
+     */
+    public function performReadonlyTransformation()
+    {
+        $value = $this->Value();
+        $field = ReadonlyField::create(
+            $this->getName(),
+            $this->Title(),
+            $value
+        );
+        $field->setDescription( $this->getDescription() );
+        $field->setRightTitle( $this->RightTitle() );
+        return $field;
+    }
+
+
+}