edit.php

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<?php
use Elgg\Exceptions\Http\EntityPermissionsException;

$widget = elgg_extract('entity', $vars);
if (!$widget instanceof \ElggWidget) {
    return;
}

if (!$widget->canEdit()) {
    throw new EntityPermissionsException();
}

$form = elgg_view_form('widgets/save', [
    'class' => [
        preg_replace('/[^a-z0-9-]/i', '-', "elgg-form-widgets-save-{$widget->handler}"),
    ],
    'prevent_double_submit' => false,
], $vars);

if (empty($form)) {
    return;
}

echo elgg_format_element('div', [
    'class' => 'elgg-widget-edit',
    'id' => "widget-edit-{$widget->guid}",
], $form);