/**
* Return the ID of the current filter.
*
* @return int|null
*/
public function currentFilterID()
{
if ($filterTag = $this->constraint(static::FilterVar)) {
if ($filter = GridListFilter::get()->filter(ModelTag::SingleFieldName, $filterTag)->first()) {
return $filter->ID;
}
}
}
/**
* Make sure only the custom filters are provided. This needs to go after other filter providers.
*
* @param $filters
*/
public function constrainGridListFilters(&$filters, &$parameters = [])
{
$page = \Director::get_current_page();
if ($page instanceof \CMSMain) {
$page = $page->currentPage();
}
if ($customFilters = $page->config()->get('gridlist_custom_filters') ?: []) {
$filters = new \ArrayList();
foreach ($customFilters as $tag => $title) {
if (!($filter = GridListFilter::get()->filter(['ModelTag' => $tag])->first())) {
$filter = new GridListFilter([Title::SingleFieldName => $title, GridListFilter::TagFieldName => $tag]);
}
$filters->push($filter);
}
}
}
/**
* @param \DataList|\ArrayList $items
* @param $filters
* @param array $parameters
*/
public function sequenceGridListItems(&$items, $filters, &$parameters = [])
{
$limit = isset($parameters['PageLength']) ? $parameters['PageLength'] : null;
// filter items for each filter to current page length
if ($limit) {
$start = GridList::service()->Filters()->start() ?: 0;
$out = new \ArrayList();
$currentFilter = GridList::service()->constraint(Constraints::FilterVar);
if ($currentFilter && $currentFilter != 'all') {
if ($filter = GridListFilter::get()->filter(['ModelTag' => $currentFilter])->first()) {
$out->merge($items->limit($limit, $start));
}
} else {
foreach ($filters as $filter) {
$filtered = new \ArrayList();
foreach ($items as $item) {
if ($item instanceof Block) {
// only push blocks first page
if ($start == 0) {
$filtered->push($item);
}
} else {
if ($currentFilter == 'all') {
$filtered->push($item);
} else {
if ($item->GridListFilters()->find('ID', $filter->ID)) {
$filtered->push($item);
}
}
}
}
// merge limited filtered items back in
$out->merge($filtered->limit($limit, $start));
}
}
$items = $out;
}
}
public function provideGridListFilters()
{
return GridListFilter::get()->sort('Sort');
}