add_panel.php

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<?php
$widgets = elgg_extract('widgets', $vars);
$context = elgg_extract('context', $vars);
$exact = elgg_extract('exact_match', $vars, false);
$container = elgg_extract('container', $vars, elgg_get_page_owner_entity());

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

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

?>
<div class="elgg-widgets-add-panel hidden clearfix" id="widgets-add-panel">
    <p>
        <?php echo elgg_echo('widgets:add:description'); ?>
    </p>
    <ul>
<?php
        foreach ($widget_types as $handler => $widget_type) {
            // check if widget added and only one instance allowed
            if ($widget_type->multiple == false && in_array($handler, $current_handlers)) {
                $class = 'elgg-state-unavailable';
                $tooltip = elgg_echo('widget:unavailable');
            } else {
                $class = 'elgg-state-available';
                $tooltip = $widget_type->description;
            }

            if ($widget_type->multiple) {
                $class .= ' elgg-widget-multiple';
            } else {
                $class .= ' elgg-widget-single';
            }

            echo "<li title=\"$tooltip\" class=\"$class\" data-elgg-widget-type=\"$handler\">$widget_type->name</li>";
        }
?>
    </ul>
<?php
    echo elgg_view('input/hidden', array(
        'name' => 'widget_context',
        'value' => $context
    ));
    echo elgg_view('input/hidden', array(
        'name' => 'show_access',
        'value' => (int)$vars['show_access']
    ));
?>
</div>