remove.php

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<?php
if (elgg_extract('show_remove', $vars, true) === false) {
    return;
}

$entity = elgg_extract('entity', $vars);
if (!$entity instanceof ElggEntity) {
    // no way to check for icon
    return;
}

$icon_type = elgg_extract('icon_type', $vars, 'icon');
$size = elgg_extract('thumb_size', $vars, 'medium');

if (!$entity->hasIcon($size, $icon_type)) {
    // no icon uploaded
    return;
}

$name = elgg_extract('remove_name', $vars);
if (elgg_is_empty($name)) {
    // make name based on file name
    $name = elgg_extract('name', $vars, 'icon') . '_remove';
}

echo elgg_view_field([
    '#type' => 'checkbox',
    '#label' => elgg_echo('entity:edit:icon:remove:label'),
    '#class' => 'elgg-entity-edit-icon-remove',
    'name' => $name,
    'value' => 1,
    'switch' => true,
]);