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feat: sliding window pagination #18

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feat: sliding window pagination #18

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2 changes: 1 addition & 1 deletion src/Component/DataGridPaginator.latte
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@

{var $link = [$control->getParent(), link]}

<div n:if="$paginator->pageCount > 1">
<div>
{if $paginator->isFirst()}
<a class="first btn btn-sm btn-default disabled bg-white" style="padding-top: 7px!important;">
{else}
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22 changes: 9 additions & 13 deletions src/Component/DataGridPaginator.php
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@
*/
class DataGridPaginator extends \Contributte\Datagrid\Components\DatagridPaginator\DatagridPaginator
{
private const int WINDOW_SIZE = 6;
private const int SURROUNDING_PAGES = 2;

public function getTemplateFile(): string
{
Expand All @@ -21,29 +21,25 @@ public function getTemplateFile(): string

public function render(): void
{
$this->getTemplate()->steps = $this->computeWindowSteps($this->getPaginator());
$this->getTemplate()->steps = $this->computeSlidingWindowSteps($this->getPaginator());
parent::render();
}

/**
* @return int[]
*/
private function computeWindowSteps(Paginator $paginator): array
private function computeSlidingWindowSteps(Paginator $paginator): array
{
if ($paginator->pageCount < 2) {
return [$paginator->page];
}

$first = $paginator->firstPage;
$last = $paginator->lastPage;

$blockIndex = intdiv($paginator->page - $first, self::WINDOW_SIZE);
$start = $first + $blockIndex * self::WINDOW_SIZE;
$end = min($last, $start + self::WINDOW_SIZE - 1);

$steps = range($start, $end);
$steps[] = $first;
$steps[] = $last;
$steps = range(
max($paginator->firstPage, $paginator->page - self::SURROUNDING_PAGES),
(int) min($paginator->lastPage, $paginator->page + self::SURROUNDING_PAGES)
);
$steps[] = $paginator->firstPage;
$steps[] = $paginator->lastPage;

$steps = array_values(array_unique($steps));
sort($steps);
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