<?php
           
       namespace Modules\WidgetNameHere;
           
       use Zabbix\Core\CWidget;
           
       class Widget extends CWidget {
           
           public const MY_CONSTANT = 0;
           
           public function getTranslationStrings(): array {
               return [
                   'class.widget.js' => [
                       'No data' => _('No data')
                   ]
               ];
           }
       }

<?php
       
       namespace Modules\MyCustomWidget\Includes;
       
       use Modules\MyCustomWidget\Widget;
       
       use Zabbix\Widgets\{
           CWidgetField,
           CWidgetForm
       };
       
       use Zabbix\Widgets\Fields\{
           CWidgetFieldMultiSelectItem,
           CWidgetFieldTextBox,
           CWidgetFieldColor
       };
       
       
       class WidgetForm extends CWidgetForm {
       
           public const DEFAULT_COLOR_PALETTE = [
               'FF465C', 'B0AF07', '0EC9AC', '524BBC', 'ED1248', 'D1E754', '2AB5FF', '385CC7', 'EC1594', 'BAE37D',
               '6AC8FF', 'EE2B29', '3CA20D', '6F4BBC', '00A1FF', 'F3601B', '1CAE59', '45CFDB', '894BBC', '6D6D6D'
           ];
       
           public function addFields(): self {
               return $this
                   ->addField(
                       (new CWidgetFieldMultiSelectItem('itemid', _('Item')))
                           ->setFlags(CWidgetField::FLAG_NOT_EMPTY | CWidgetField::FLAG_LABEL_ASTERISK)
                           ->setMultiple(false)
                   )
                   ->addField(
                       new CWidgetFieldTextBox('description', _('Description'))
                   )
                   ->addField(
                       (new CWidgetFieldColor('chart_color', _('Color')))->setDefault('FF0000')
                   );
           }
       }

<?php
           
       /**
        * La meva vista de formulari de giny personalitzada.
        *
        * @var CView $this
        * @var array $data
        */
       
       use Modules\MyCustomWidget\Includes\WidgetForm;
       
       (new CWidgetFormView($data))
           ->addField(
           (new CWidgetFieldMultiSelectItemView($data['fields']['itemid']))->setPopupParameter('numeric', true)
           )
           ->addFieldset(
           (new CWidgetFormFieldsetCollapsibleView(_('Advanced configuration')))
           ->addField(   
           new CWidgetFieldTextBoxView($data['fields']['description'])
           )
           ->addField(
           new CWidgetFieldColorView($data['fields']['chart_color'])   
           )
           )
           ->includeJsFile('widget.edit.js.php')
           ->addJavaScript('my_custom_widget_form.init('.json_encode([
           'color_palette' => WidgetForm::DEFAULT_COLOR_PALETTE
           ]).');')
           ->show();   

<?php
       
       use Modules\MyCustomWidget\Widget;
       
       ?>
       
       window.my_custom_widget_form = new class {
       
           init({color_palette}) {
               colorPalette.setThemeColors(color_palette);
       
               for (const colorpicker of jQuery('.<?= ZBX_STYLE_COLOR_PICKER ?> input')) {
                   jQuery(colorpicker).colorpicker();
               }
       
               const overlay = overlays_stack.getById('widget_properties');
       
               for (const event of ['overlay.reload', 'overlay.close']) {
                   overlay.$dialogue[0].addEventListener(event, () => { jQuery.colorpicker('hide'); });
               }
           }
       };