save.php

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<?php
$widget = elgg_extract('widget', $vars);
if (!$widget instanceof ElggWidget) {
    return;
}

$custom_form_section = '';
if (elgg_view_exists("widgets/{$widget->handler}/edit")) {
    $custom_form_section = elgg_view("widgets/{$widget->handler}/edit", ['entity' => $widget]);
}

$access = '';
if (elgg_extract('show_access', $vars, true)) {
    $access = elgg_view_field([
        '#type' => 'access',
        '#label' => elgg_echo('access'),
        'name' => 'params[access_id]',
        'value' => $widget->access_id,
        'entity' => $widget,
    ]);
}

if (!$custom_form_section && !$access) {
    return;
}

echo $custom_form_section;
echo $access;

echo elgg_view_field([
    '#type' => 'hidden',
    'name' => 'guid',
    'value' => $widget->guid,
]);

if (elgg_in_context('default_widgets')) {
    echo elgg_view_field([
        '#type' => 'hidden',
        'name' => 'default_widgets',
        'value' => 1,
    ]);
}

$footer = elgg_view_field([
    '#type' => 'submit',
    'value' => elgg_echo('save'),
]);

elgg_set_form_footer($footer);