silverstripe-gridfieldexten.../code/GridFieldConfigurablePaginator.php

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<?php
/**
* GridFieldConfigurablePaginator paginates the {@link GridField} list and adds controls to the bottom of
* the {@link GridField}. The page sizes are configurable.
*/
class GridFieldConfigurablePaginator extends GridFieldPaginator
{
/**
* Specifies default page sizes
*
* @config
* @var int
*/
private static $default_page_sizes = array(15, 30, 60);
/**
* Which template to use for rendering
*
* @var string
*/
protected $itemClass = 'GridFieldConfigurablePaginator';
/**
* @var GridField
*/
protected $gridField;
/**
* @var GridState_Data
*/
protected $gridFieldState;
/**
* @var int[]
*/
protected $pageSizes = array();
/**
* @param int $itemsPerPage How many items should be displayed per page
* @param int $pageSizes The page sizes to show in the dropdown
*/
public function __construct($itemsPerPage = null, $pageSizes = null)
{
$this->setPageSizes($pageSizes ?: Config::inst()->get('GridFieldConfigurablePaginator', 'default_page_sizes'));
if (!$itemsPerPage) {
$itemsPerPage = $this->pageSizes[0];
}
parent::__construct($itemsPerPage);
}
/**
* Get the total number of records in the list
*
* @return int
*/
public function getTotalRecords()
{
return (int) $this->getGridField()->getList()->count();
}
/**
* Get the first shown record number
*
* @return int
*/
public function getFirstShown()
{
$firstShown = $this->getGridPagerState()->firstShown ?: 1;
// Prevent visiting a page with an offset higher than the total number of items
if ($firstShown > $this->getTotalRecords()) {
$this->getGridPagerState()->firstShown = $firstShown = 1;
}
return $firstShown;
}
/**
* Set the first shown record number. Will be stored in the state.
*
* @param int $firstShown
* @return $this
*/
public function setFirstShown($firstShown = 1)
{
$this->getGridPagerState()->firstShown = (int) $firstShown;
return $this;
}
/**
* Get the last shown record number
*
* @return int
*/
public function getLastShown()
{
return min($this->getTotalRecords(), $this->getFirstShown() + $this->getItemsPerPage() - 1);
}
/**
* Get the total number of pages, given the current number of items per page. The total
* pages might be higher than <totalitems> / <itemsperpage> if the first shown record
* is half way through a standard page break point.
*
* @return int
*/
public function getTotalPages()
{
// Pages before
$pages = ceil(($this->getFirstShown() - 1) / $this->getItemsPerPage());
// Current page
$pages++;
// Pages after
$pages += ceil(($this->getTotalRecords() - $this->getLastShown()) / $this->getItemsPerPage());
return (int) $pages;
}
/**
* Get the page currently active. This is calculated by adding one to the previous number
* of pages calculated via the "first shown record" position.
*
* @return int
*/
public function getCurrentPage()
{
return (int) ceil(($this->getFirstShown() - 1) / $this->getItemsPerPage()) + 1;
}
/**
* Get the next page number
*
* @return int
*/
public function getNextPage()
{
return min($this->getTotalPages(), $this->getCurrentPage() + 1);
}
/**
* Get the previous page number
*
* @return int
*/
public function getPreviousPage()
{
return max(1, $this->getCurrentPage() - 1);
}
/**
* Set the page sizes to use in the "Show x" dropdown
*
* @param array $pageSizes
* @return $this
*/
public function setPageSizes(array $pageSizes)
{
$this->pageSizes = $pageSizes;
return $this;
}
/**
* Get the sizes for the "Show x" dropdown
*
* @return array
*/
public function getPageSizes()
{
return $this->pageSizes;
}
/**
* Gets a list of page sizes for use in templates as a dropdown
*
* @return ArrayList
*/
public function getPageSizesAsList()
{
$pageSizes = ArrayList::create();
$perPage = $this->getItemsPerPage();
foreach ($this->getPageSizes() as $pageSize) {
$pageSizes->push(array(
'Size' => $pageSize,
'Selected' => $pageSize == $perPage
));
}
return $pageSizes;
}
/**
* Get the GridField used in this request
*
* @return GridField
* @throws Exception If the GridField has not been previously set
*/
public function getGridField()
{
if ($this->gridField) {
return $this->gridField;
}
throw new Exception('No GridField available yet for this request!');
}
/**
* Set the GridField so it can be used in other parts of the component during this request
*
* @param GridField $gridField
* @return $this
*/
public function setGridField(GridField $gridField)
{
$this->gridField = $gridField;
return $this;
}
public function handleAction(GridField $gridField, $actionName, $arguments, $data)
{
$this->setGridField($gridField);
if ($actionName !== 'paginate') {
return;
}
$state = $this->getGridPagerState();
$state->firstShown = (int) $arguments['first-shown'];
$state->pageSize = $data[$gridField->getName()]['page-sizes'];
$this->setItemsPerPage($state->pageSize);
}
public function getManipulatedData(GridField $gridField, SS_List $dataList)
{
// Assign the GridField to the class so it can be used later in the request
$this->setGridField($gridField);
// Retain page sizes during actions provided by other components
$state = $this->getGridPagerState();
if (is_numeric($state->pageSize)) {
$this->setItemsPerPage($state->pageSize);
}
if (!($dataList instanceof SS_Limitable) || ($dataList instanceof UnsavedRelationList)) {
return $dataList;
}
return $dataList->limit($this->getItemsPerPage(), $this->getFirstShown() - 1);
}
/**
* Add the configurable page size options to the template data
*
* {@inheritDoc}
*
* @param GridField $gridField
* @return ArrayList|null
*/
public function getTemplateParameters(GridField $gridField)
{
$state = $this->getGridPagerState();
if (is_numeric($state->pageSize)) {
$this->setItemsPerPage($state->pageSize);
}
$arguments = $this->getPagerArguments();
// Figure out which page and record range we're on
if (!$arguments['total-rows']) {
return;
}
// Define a list of the FormActions that should be generated for pager controls (see getPagerActions())
$controls = array(
'first' => array(
'title' => 'First',
'args' => array('first-shown' => 1),
'extra-class' => 'ss-gridfield-firstpage',
'disable-previous' => ($this->getCurrentPage() == 1)
),
'prev' => array(
'title' => 'Previous',
'args' => array('first-shown' => $arguments['first-shown'] - $this->getItemsPerPage()),
'extra-class' => 'ss-gridfield-previouspage',
'disable-previous' => ($this->getCurrentPage() == 1)
),
'next' => array(
'title' => 'Next',
'args' => array('first-shown' => $arguments['first-shown'] + $this->getItemsPerPage()),
'extra-class' => 'ss-gridfield-nextpage',
'disable-next' => ($this->getCurrentPage() == $arguments['total-pages'])
),
'last' => array(
'title' => 'Last',
'args' => array('first-shown' => ($this->getTotalPages() - 1) * $this->getItemsPerPage() + 1),
'extra-class' => 'ss-gridfield-lastpage',
'disable-next' => ($this->getCurrentPage() == $arguments['total-pages'])
),
'pagesize' => array(
'title' => 'Page Size',
'args' => array('first-shown' => $arguments['first-shown']),
'extra-class' => 'ss-gridfield-pagesize-submit'
),
);
if ($controls['prev']['args']['first-shown'] < 1) {
$controls['prev']['args']['first-shown'] = 1;
}
$actions = $this->getPagerActions($controls, $gridField);
// Render in template
return ArrayData::create(array(
'OnlyOnePage' => ($arguments['total-pages'] == 1),
'FirstPage' => $actions['first'],
'PreviousPage' => $actions['prev'],
'NextPage' => $actions['next'],
'LastPage' => $actions['last'],
'PageSizesSubmit' => $actions['pagesize'],
'CurrentPageNum' => $this->getCurrentPage(),
'NumPages' => $arguments['total-pages'],
'FirstShownRecord' => $arguments['first-shown'],
'LastShownRecord' => $arguments['last-shown'],
'NumRecords' => $arguments['total-rows'],
'PageSizes' => $this->getPageSizesAsList(),
'PageSizesName' => $gridField->getName() . '[page-sizes]',
));
}
public function getHTMLFragments($gridField)
{
GridFieldExtensions::include_requirements();
$gridField->addExtraClass('ss-gridfield-configurable-paginator');
$forTemplate = $this->getTemplateParameters($gridField);
if ($forTemplate) {
return array(
'footer' => $forTemplate->renderWith(
$this->itemClass,
array('Colspan' => count($gridField->getColumns()))
)
);
}
}
/**
* Returns an array containing the arguments for the pagination: total rows, pages, first record etc
*
* @return array
*/
protected function getPagerArguments()
{
return array(
'total-rows' => $this->getTotalRecords(),
'total-pages' => $this->getTotalPages(),
'items-per-page' => $this->getItemsPerPage(),
'first-shown' => $this->getFirstShown(),
'last-shown' => $this->getLastShown(),
);
}
/**
* Returns FormActions for each of the pagination actions, in an array
*
* @param array $controls
* @param GridField $gridField
* @return GridField_FormAction[]
*/
public function getPagerActions(array $controls, GridField $gridField)
{
$actions = array();
foreach ($controls as $key => $arguments) {
$action = GridField_FormAction::create(
$gridField,
'pagination_' . $key,
$arguments['title'],
'paginate',
$arguments['args']
);
if (isset($arguments['extra-class'])) {
$action->addExtraClass($arguments['extra-class']);
}
if (isset($arguments['disable-previous']) && $arguments['disable-previous']) {
$action = $action->performDisabledTransformation();
} elseif (isset($arguments['disable-next']) && $arguments['disable-next']) {
$action = $action->performDisabledTransformation();
}
$actions[$key] = $action;
}
return $actions;
}
public function getActions($gridField)
{
return array('paginate');
}
/**
* Gets the state from the current request's GridField and sets some default values on it
*
* @param GridField $gridField Not used, but present for parent method compatibility
* @return GridState_Data
*/
protected function getGridPagerState(GridField $gridField = null)
{
if (!$this->gridFieldState) {
$state = $this->getGridField()->State->GridFieldConfigurablePaginator;
// SS 3.1 compatibility (missing __call)
if (is_object($state->firstShown)) {
$state->firstShown = 1;
}
if (is_object($state->pageSize)) {
$state->pageSize = $this->getItemsPerPage();
}
// Handle free input in the page number field
$parentState = $this->getGridField()->State->GridFieldPaginator;
if (is_object($parentState->currentPage)) {
$parentState->currentPage = 0;
}
if ($parentState->currentPage >= 1) {
$state->firstShown = ($parentState->currentPage - 1) * $this->getItemsPerPage() + 1;
$parentState->currentPage = null;
}
$this->gridFieldState = $state;
}
return $this->gridFieldState;
}
}