265 lines
8.1 KiB
PHP
Executable File
265 lines
8.1 KiB
PHP
Executable File
<?php
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/**
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* GridFieldPaginator paginates the {@link GridField} list and adds controls
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* to the bottom of the {@link GridField}.
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*
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* @package framework
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* @subpackage fields-gridfield
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*/
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class GridFieldPaginator implements GridField_HTMLProvider, GridField_DataManipulator, GridField_ActionProvider {
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/**
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* @var int
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*/
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protected $itemsPerPage = 15;
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/**
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* Which template to use for rendering
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*
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* @var string
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*/
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protected $itemClass = 'GridFieldPaginator_Row';
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/**
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* See {@link setThrowExceptionOnBadDataType()}
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*/
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protected $throwExceptionOnBadDataType = true;
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/**
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*
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* @param int $itemsPerPage - How many items should be displayed per page
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*/
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public function __construct($itemsPerPage=null) {
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if($itemsPerPage) $this->itemsPerPage = $itemsPerPage;
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}
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/**
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* Determine what happens when this component is used with a list that isn't {@link SS_Filterable}.
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*
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* - true: An exception is thrown
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* - false: This component will be ignored - it won't make any changes to the GridField.
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*
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* By default, this is set to true so that it's clearer what's happening, but the predefined
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* {@link GridFieldConfig} subclasses set this to false for flexibility.
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*/
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public function setThrowExceptionOnBadDataType($throwExceptionOnBadDataType) {
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$this->throwExceptionOnBadDataType = $throwExceptionOnBadDataType;
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}
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/**
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* See {@link setThrowExceptionOnBadDataType()}
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*/
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public function getThrowExceptionOnBadDataType() {
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return $this->throwExceptionOnBadDataType;
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}
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/**
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* Check that this dataList is of the right data type.
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* Returns false if it's a bad data type, and if appropriate, throws an exception.
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*/
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protected function checkDataType($dataList) {
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if($dataList instanceof SS_Limitable) {
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return true;
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} else {
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if($this->throwExceptionOnBadDataType) {
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throw new LogicException(
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get_class($this) . " expects an SS_Limitable list to be passed to the GridField.");
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}
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return false;
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}
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}
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/**
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*
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* @param GridField $gridField
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* @return array
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*/
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public function getActions($gridField) {
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if(!$this->checkDataType($gridField->getList())) return;
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return array('paginate');
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}
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/**
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*
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* @param GridField $gridField
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* @param string $actionName
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* @param string $arguments
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* @param array $data
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* @return void
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*/
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public function handleAction(GridField $gridField, $actionName, $arguments, $data) {
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if(!$this->checkDataType($gridField->getList())) return;
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if($actionName !== 'paginate') {
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return;
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}
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$state = $this->getGridPagerState($gridField);
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$state->currentPage = (int)$arguments;
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}
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protected $totalItems = 0;
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/**
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* Retrieves/Sets up the state object used to store and retrieve information
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* about the current paging details of this GridField
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* @param GridField $gridField
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* @return GridState_Data
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*/
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protected function getGridPagerState(GridField $gridField) {
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$state = $gridField->State->GridFieldPaginator;
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// Force the state to the initial page if none is set
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if(empty($state->currentPage)) $state->currentPage = 1;
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return $state;
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}
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/**
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*
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* @param GridField $gridField
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* @param SS_List $dataList
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* @return SS_List
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*/
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public function getManipulatedData(GridField $gridField, SS_List $dataList) {
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if(!$this->checkDataType($dataList)) return $dataList;
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$state = $this->getGridPagerState($gridField);
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// Update item count prior to filter. GridFieldPageCount will rely on this value
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$this->totalItems = $dataList->count();
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if(!($dataList instanceof SS_Limitable) || ($dataList instanceof UnsavedRelationList)) {
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return $dataList;
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}
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$startRow = $this->itemsPerPage * ($state->currentPage - 1);
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return $dataList->limit((int)$this->itemsPerPage, (int)$startRow);
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}
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/**
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* Determines arguments to be passed to the template for building this field
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* @return ArrayData|null If paging is available this will be an ArrayData
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* object of paging details with these parameters:
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* <ul>
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* <li>OnlyOnePage: boolean - Is there only one page?</li>
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* <li>FirstShownRecord: integer - Number of the first record displayed</li>
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* <li>LastShownRecord: integer - Number of the last record displayed</li>
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* <li>NumRecords: integer - Total number of records</li>
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* <li>NumPages: integer - The number of pages</li>
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* <li>CurrentPageNum (optional): integer - If OnlyOnePage is false, the number of the current page</li>
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* <li>FirstPage (optional): GridField_FormAction - Button to go to the first page</li>
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* <li>PreviousPage (optional): GridField_FormAction - Button to go to the previous page</li>
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* <li>NextPage (optional): GridField_FormAction - Button to go to the next page</li>
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* <li>LastPage (optional): GridField_FormAction - Button to go to last page</li>
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* </ul>
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*/
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public function getTemplateParameters(GridField $gridField) {
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if(!$this->checkDataType($gridField->getList())) return null;
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$state = $this->getGridPagerState($gridField);
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// Figure out which page and record range we're on
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$totalRows = $this->totalItems;
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if(!$totalRows) return null;
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$totalPages = (int)ceil($totalRows/$this->itemsPerPage);
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if($totalPages == 0)
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$totalPages = 1;
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$firstShownRecord = ($state->currentPage - 1) * $this->itemsPerPage + 1;
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if($firstShownRecord > $totalRows)
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$firstShownRecord = $totalRows;
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$lastShownRecord = $state->currentPage * $this->itemsPerPage;
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if($lastShownRecord > $totalRows)
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$lastShownRecord = $totalRows;
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// If there is only 1 page for all the records in list, we don't need to go further
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// to sort out those first page, last page, pre and next pages, etc
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// we are not render those in to the paginator.
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if($totalPages === 1){
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return new ArrayData(array(
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'OnlyOnePage' => true,
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'FirstShownRecord' => $firstShownRecord,
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'LastShownRecord' => $lastShownRecord,
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'NumRecords' => $totalRows,
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'NumPages' => $totalPages
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));
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} else {
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// First page button
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$firstPage = new GridField_FormAction($gridField, 'pagination_first', 'First', 'paginate', 1);
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$firstPage->addExtraClass('ss-gridfield-firstpage');
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if($state->currentPage == 1)
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$firstPage = $firstPage->performDisabledTransformation();
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// Previous page button
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$previousPageNum = $state->currentPage <= 1 ? 1 : $state->currentPage - 1;
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$previousPage = new GridField_FormAction($gridField, 'pagination_prev', 'Previous',
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'paginate', $previousPageNum);
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$previousPage->addExtraClass('ss-gridfield-previouspage');
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if($state->currentPage == 1)
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$previousPage = $previousPage->performDisabledTransformation();
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// Next page button
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$nextPageNum = $state->currentPage >= $totalPages ? $totalPages : $state->currentPage + 1;
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$nextPage = new GridField_FormAction($gridField, 'pagination_next', 'Next',
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'paginate', $nextPageNum);
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$nextPage->addExtraClass('ss-gridfield-nextpage');
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if($state->currentPage == $totalPages)
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$nextPage = $nextPage->performDisabledTransformation();
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// Last page button
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$lastPage = new GridField_FormAction($gridField, 'pagination_last', 'Last', 'paginate', $totalPages);
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$lastPage->addExtraClass('ss-gridfield-lastpage');
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if($state->currentPage == $totalPages)
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$lastPage = $lastPage->performDisabledTransformation();
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// Render in template
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return new ArrayData(array(
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'OnlyOnePage' => false,
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'FirstPage' => $firstPage,
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'PreviousPage' => $previousPage,
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'CurrentPageNum' => $state->currentPage,
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'NumPages' => $totalPages,
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'NextPage' => $nextPage,
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'LastPage' => $lastPage,
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'FirstShownRecord' => $firstShownRecord,
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'LastShownRecord' => $lastShownRecord,
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'NumRecords' => $totalRows
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));
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}
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}
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/**
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*
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* @param GridField $gridField
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* @return array
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*/
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public function getHTMLFragments($gridField) {
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$forTemplate = $this->getTemplateParameters($gridField);
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if($forTemplate) {
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return array(
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'footer' => $forTemplate->renderWith($this->itemClass,
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array('Colspan'=>count($gridField->getColumns())))
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);
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}
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}
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/**
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* @param Int
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*/
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public function setItemsPerPage($num) {
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$this->itemsPerPage = $num;
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return $this;
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}
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/**
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* @return Int
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*/
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public function getItemsPerPage() {
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return $this->itemsPerPage;
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}
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}
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