add_panel.php

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<?php
elgg_ajax_gatekeeper();

// restoring context stack
$context_stack = get_input('context_stack');
if (!empty($context_stack) && is_array($context_stack)) {
    elgg_set_context_stack($context_stack);
}

elgg_require_js('resources/widgets/add_panel');

$context = elgg_extract('context', $vars, get_input('context'));
$owner_guid = (int) elgg_extract('owner_guid', $vars, (int) get_input('owner_guid'));
elgg_entity_gatekeeper($owner_guid);

$owner = get_entity($owner_guid);

elgg_set_page_owner_guid($owner->guid);

$widgets = elgg_get_widgets($owner->guid, $context);
$widget_types = elgg_get_widget_types([
    'context' => $context,
    'container' => $owner,
]);
uasort($widget_types, function ($a, $b) {
    return strcmp($a->name, $b->name);
});

$current_handlers = [];
foreach ($widgets as $column_widgets) {
    foreach ($column_widgets as $widget) {
        $current_handlers[] = $widget->handler;
    }
}

$result = elgg_format_element('p', [
    'class' => 'elgg-text-help',
], elgg_echo('widgets:add:description'));

$list_items = '';
foreach ($widget_types as $handler => $widget_type) {
    $class = [];
    // check if widget added and only one instance allowed
    if (!$widget_type->multiple && in_array($handler, $current_handlers)) {
        $class[] = 'elgg-state-unavailable';
    } else {
        $class[] = 'elgg-state-available';
    }

    $class[] = $widget_type->multiple ? 'elgg-widget-multiple' : 'elgg-widget-single';

    $action = '<div class="elgg-widgets-add-actions elgg-level">';
    if (!$widget_type->multiple) {
        $action .= elgg_format_element('span', ['class' => 'elgg-quiet'], elgg_echo('widget:unavailable'));
    }
    
    $action .= elgg_view('output/url', [
        'class' => 'elgg-button elgg-button-submit elgg-size-small',
        'text' => elgg_echo('add'),
        'href' => elgg_generate_action_url('widgets/add', [
            'handler' => $handler,
            'page_owner_guid' => $owner_guid,
            'context' => $context,
            'show_access' => elgg_extract('show_access', $vars),
            'default_widgets' => elgg_in_context('default_widgets'),
        ]),
    ]);
    $action .= '</div>';

    $description = "<h4>{$widget_type->name}</h4>";

    if ($widget_type->description) {
        $description .= elgg_format_element('div', ['class' => 'elgg-quiet'], $widget_type->description);
    }

    $description = elgg_format_element('div', [
        'class' => 'elgg-widgets-add-description',
    ], $description);

    $item_content = elgg_format_element('div', [
        'class' => 'elgg-level',
    ], $description . $action);

    $list_items .= elgg_format_element('li', [
        'class' => $class,
        'data-elgg-widget-type' => $handler,
    ], $item_content);
}

$result .= "<ul>$list_items</ul>";

echo elgg_view_module('aside', elgg_echo('widgets:add'), $result, ['class' => 'elgg-widgets-add-panel']);