<?php /** * TPager class file. * * @author Qiang Xue <qiang.xue@gmail.com> * @link http://www.pradosoft.com/ * @copyright Copyright © 2005 PradoSoft * @license http://www.pradosoft.com/license/ * @version $Id$ * @package System.Web.UI.WebControls */ /** * TPager class. * * TPager creates a pager that provides UI for end-users to interactively * specify which page of data to be rendered in a {@link TDataBoundControl}-derived control, * such as {@link TDataList}, {@link TRepeater}, {@link TCheckBoxList}, etc. * The target data-bound control is specified by {@link setControlToPaginate ControlToPaginate}, * which must be the ID path of the target control reaching from the pager's * naming container. Note, the target control must have its {@link TDataBoundControl::setAllowPaging AllowPaging} * set to true. * * TPager can display three different UIs, specified via {@link setMode Mode}: * - NextPrev: a next page and a previous page button are rendered. * - Numeric: a list of page index buttons are rendered. * - List: a dropdown list of page indices are rendered. * * TPager raises an {@link onPageIndexChanged OnPageIndexChanged} event when * the end-user interacts with it and specifies a new page (e.g. clicking * on a page button that leads to a new page.) The new page index may be obtained * from the event parameter's property {@link TPagerPageChangedEventParameter::getNewPageIndex NewPageIndex}. * Normally, in the event handler, one can set the {@link TDataBoundControl::getCurrentPageIndex CurrentPageIndex} * to this new page index so that the new page of data is rendered. * * Multiple pagers can be associated with the same data-bound control. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Web.UI.WebControls * @since 3.0.2 */ class TPager extends TWebControl implements INamingContainer { /** * Command name that TPager understands. */ const CMD_PAGE='Page'; const CMD_PAGE_NEXT='Next'; const CMD_PAGE_PREV='Previous'; const CMD_PAGE_FIRST='First'; const CMD_PAGE_LAST='Last'; private $_pageCount=0; /** * Restores the pager state. * This method overrides the parent implementation and is invoked when * the control is loading persistent state. */ public function loadState() { parent::loadState(); if($this->getEnableViewState(true)) { $this->getControls()->clear(); $this->buildPager(); } } /** * @return string the ID path of the control whose content would be paginated. */ public function getControlToPaginate() { return $this->getViewState('ControlToPaginate',''); } /** * Sets the ID path of the control whose content would be paginated. * The ID path is the dot-connected IDs of the controls reaching from * the pager's naming container to the target control. * @param string the ID path */ public function setControlToPaginate($value) { $this->setViewState('ControlToPaginate',$value,''); } /** * @return TPagerMode pager mode. Defaults to TPagerMode::NextPrev. */ public function getMode() { return $this->getViewState('Mode',TPagerMode::NextPrev); } /** * @param TPagerMode pager mode. */ public function setMode($value) { $this->setViewState('Mode',TPropertyValue::ensureEnum($value,'TPagerMode'),TPagerMode::NextPrev); } /** * @return TPagerButtonType the type of command button for paging. Defaults to TPagerButtonType::LinkButton. */ public function getButtonType() { return $this->getViewState('ButtonType',TPagerButtonType::LinkButton); } /** * @param TPagerButtonType the type of command button for paging. */ public function setButtonType($value) { $this->setViewState('ButtonType',TPropertyValue::ensureEnum($value,'TPagerButtonType'),TPagerButtonType::LinkButton); } /** * @return string text for the next page button. Defaults to '>'. */ public function getNextPageText() { return $this->getViewState('NextPageText','>'); } /** * @param string text for the next page button. */ public function setNextPageText($value) { $this->setViewState('NextPageText',$value,'>'); } /** * @return string text for the previous page button. Defaults to '<'. */ public function getPrevPageText() { return $this->getViewState('PrevPageText','<'); } /** * @param string text for the next page button. */ public function setPrevPageText($value) { $this->setViewState('PrevPageText',$value,'<'); } /** * @return string text for the first page button. Defaults to '<<'. */ public function getFirstPageText() { return $this->getViewState('FirstPageText','<<'); } /** * @param string text for the first page button. If empty, the first page button will not be rendered. */ public function setFirstPageText($value) { $this->setViewState('FirstPageText',$value,'<<'); } /** * @return string text for the last page button. Defaults to '>>'. */ public function getLastPageText() { return $this->getViewState('LastPageText','>>'); } /** * @param string text for the last page button. If empty, the last page button will not be rendered. */ public function setLastPageText($value) { $this->setViewState('LastPageText',$value,'>>'); } /** * @return integer maximum number of pager buttons to be displayed. Defaults to 10. */ public function getPageButtonCount() { return $this->getViewState('PageButtonCount',10); } /** * @param integer maximum number of pager buttons to be displayed * @throws TInvalidDataValueException if the value is less than 1. */ public function setPageButtonCount($value) { if(($value=TPropertyValue::ensureInteger($value))<1) throw new TInvalidDataValueException('pager_pagebuttoncount_invalid'); $this->setViewState('PageButtonCount',$value,10); } /** * @return integer the zero-based index of the current page. Defaults to 0. */ public function getCurrentPageIndex() { return $this->getViewState('CurrentPageIndex',0); } /** * @param integer the zero-based index of the current page * @throws TInvalidDataValueException if the value is less than 0 */ protected function setCurrentPageIndex($value) { if(($value=TPropertyValue::ensureInteger($value))<0) throw new TInvalidDataValueException('pager_currentpageindex_invalid'); $this->setViewState('CurrentPageIndex',$value,0); } /** * @return integer number of pages of data items available */ public function getPageCount() { return $this->getViewState('PageCount',0); } /** * @param integer number of pages of data items available * @throws TInvalidDataValueException if the value is less than 0 */ protected function setPageCount($value) { if(($value=TPropertyValue::ensureInteger($value))<0) throw new TInvalidDataValueException('pager_pagecount_invalid'); $this->setViewState('PageCount',$value,0); } /** * @return boolean whether the current page is the first page Defaults to false. */ public function getIsFirstPage() { return $this->getCurrentPageIndex()===0; } /** * @return boolean whether the current page is the last page */ public function getIsLastPage() { return $this->getCurrentPageIndex()===$this->getPageCount()-1; } /** * Performs databinding to populate data items from data source. * This method is invoked by {@link dataBind()}. * You may override this function to provide your own way of data population. * @param Traversable the bound data */ public function onPreRender($param) { parent::onPreRender($param); $controlID=$this->getControlToPaginate(); if(($targetControl=$this->getNamingContainer()->findControl($controlID))===null || !($targetControl instanceof TDataBoundControl)) throw new TConfigurationException('pager_controltopaginate_invalid',$controlID); if($targetControl->getAllowPaging()) { $this->_pageCount=$targetControl->getPageCount(); $this->getControls()->clear(); $this->setPageCount($targetControl->getPageCount()); $this->setCurrentPageIndex($targetControl->getCurrentPageIndex()); $this->buildPager(); } else $this->_pageCount=0; } /** * Renders the control. * The method overrides the parent implementation by rendering * the pager only when there are two or more pages. * @param THtmlWriter the writer */ public function render($writer) { if($this->_pageCount>1) parent::render($writer); } /** * Builds the pager content based on the pager mode. * Current implementation includes building 'NextPrev', 'Numeric' and 'DropDownList' pagers. * Derived classes may override this method to provide additional pagers. */ protected function buildPager() { switch($this->getMode()) { case TPagerMode::NextPrev: $this->buildNextPrevPager(); break; case TPagerMode::Numeric: $this->buildNumericPager(); break; case TPagerMode::DropDownList: $this->buildListPager(); break; } } /** * Creates a pager button. * Depending on the button type, a TLinkButton or a TButton may be created. * If it is enabled (clickable), its command name and parameter will also be set. * Derived classes may override this method to create additional types of buttons, such as TImageButton. * @param string button type, either LinkButton or PushButton * @param boolean whether the button should be enabled * @param string caption of the button * @param string CommandName corresponding to the OnCommand event of the button * @param string CommandParameter corresponding to the OnCommand event of the button * @return mixed the button instance */ protected function createPagerButton($buttonType,$enabled,$text,$commandName,$commandParameter) { if($buttonType===TPagerButtonType::LinkButton) { if($enabled) $button=new TLinkButton; else { $button=new TLabel; $button->setText($text); return $button; } } else { $button=new TButton; if(!$enabled) $button->setEnabled(false); } $button->setText($text); $button->setCommandName($commandName); $button->setCommandParameter($commandParameter); $button->setCausesValidation(false); return $button; } /** * Builds a next-prev pager */ protected function buildNextPrevPager() { $buttonType=$this->getButtonType(); $controls=$this->getControls(); if($this->getIsFirstPage()) { if(($text=$this->getFirstPageText())!=='') { $label=$this->createPagerButton($buttonType,false,$text,'',''); $controls->add($label); $controls->add("\n"); } $label=$this->createPagerButton($buttonType,false,$this->getPrevPageText(),'',''); $controls->add($label); } else { if(($text=$this->getFirstPageText())!=='') { $button=$this->createPagerButton($buttonType,true,$text,self::CMD_PAGE_FIRST,''); $controls->add($button); $controls->add("\n"); } $button=$this->createPagerButton($buttonType,true,$this->getPrevPageText(),self::CMD_PAGE_PREV,''); $controls->add($button); } $controls->add("\n"); if($this->getIsLastPage()) { $label=$this->createPagerButton($buttonType,false,$this->getNextPageText(),'',''); $controls->add($label); if(($text=$this->getLastPageText())!=='') { $controls->add("\n"); $label=$this->createPagerButton($buttonType,false,$text,'',''); $controls->add($label); } } else { $button=$this->createPagerButton($buttonType,true,$this->getNextPageText(),self::CMD_PAGE_NEXT,''); $controls->add($button); if(($text=$this->getLastPageText())!=='') { $controls->add("\n"); $button=$this->createPagerButton($buttonType,true,$text,self::CMD_PAGE_LAST,''); $controls->add($button); } } } /** * Builds a numeric pager */ protected function buildNumericPager() { $buttonType=$this->getButtonType(); $controls=$this->getControls(); $pageCount=$this->getPageCount(); $pageIndex=$this->getCurrentPageIndex()+1; $maxButtonCount=$this->getPageButtonCount(); $buttonCount=$maxButtonCount>$pageCount?$pageCount:$maxButtonCount; $startPageIndex=1; $endPageIndex=$buttonCount; if($pageIndex>$endPageIndex) { $startPageIndex=((int)(($pageIndex-1)/$maxButtonCount))*$maxButtonCount+1; if(($endPageIndex=$startPageIndex+$maxButtonCount-1)>$pageCount) $endPageIndex=$pageCount; if($endPageIndex-$startPageIndex+1<$maxButtonCount) { if(($startPageIndex=$endPageIndex-$maxButtonCount+1)<1) $startPageIndex=1; } } if($startPageIndex>1) { if(($text=$this->getFirstPageText())!=='') { $button=$this->createPagerButton($buttonType,true,$text,self::CMD_PAGE_FIRST,''); $controls->add($button); $controls->add("\n"); } $prevPageIndex=$startPageIndex-1; $button=$this->createPagerButton($buttonType,true,$this->getPrevPageText(),self::CMD_PAGE,"$prevPageIndex"); $controls->add($button); $controls->add("\n"); } for($i=$startPageIndex;$i<=$endPageIndex;++$i) { if($i===$pageIndex) { $label=$this->createPagerButton($buttonType,false,"$i",'',''); $controls->add($label); } else { $button=$this->createPagerButton($buttonType,true,"$i",self::CMD_PAGE,"$i"); $controls->add($button); } if($i<$endPageIndex) $controls->add("\n"); } if($pageCount>$endPageIndex) { $controls->add("\n"); $nextPageIndex=$endPageIndex+1; $button=$this->createPagerButton($buttonType,true,$this->getNextPageText(),self::CMD_PAGE,"$nextPageIndex"); $controls->add($button); if(($text=$this->getLastPageText())!=='') { $controls->add("\n"); $button=$this->createPagerButton($buttonType,true,$text,self::CMD_PAGE_LAST,''); $controls->add($button); } } } /** * Builds a dropdown list pager */ protected function buildListPager() { $list=new TDropDownList; $this->getControls()->add($list); $list->setDataSource(range(1,$this->getPageCount())); $list->dataBind(); $list->setSelectedIndex($this->getCurrentPageIndex()); $list->setAutoPostBack(true); $list->attachEventHandler('OnSelectedIndexChanged',array($this,'listIndexChanged')); } /** * Event handler to the OnSelectedIndexChanged event of the dropdown list. * This handler will raise {@link onPageIndexChanged OnPageIndexChanged} event. * @param TDropDownList the dropdown list control raising the event * @param TEventParameter event parameter */ public function listIndexChanged($sender,$param) { $pageIndex=$sender->getSelectedIndex(); $this->onPageIndexChanged(new TPagerPageChangedEventParameter($sender,$pageIndex)); } /** * This event is raised when page index is changed due to a page button click. * @param TPagerPageChangedEventParameter event parameter */ public function onPageIndexChanged($param) { $this->raiseEvent('OnPageIndexChanged',$this,$param); } /** * Processes a bubbled event. * This method overrides parent's implementation by wrapping event parameter * for <b>OnCommand</b> event with item information. * @param TControl the sender of the event * @param TEventParameter event parameter * @return boolean whether the event bubbling should stop here. */ public function bubbleEvent($sender,$param) { if($param instanceof TCommandEventParameter) { $command=$param->getCommandName(); if(strcasecmp($command,self::CMD_PAGE)===0) { $pageIndex=TPropertyValue::ensureInteger($param->getCommandParameter())-1; $this->onPageIndexChanged(new TPagerPageChangedEventParameter($sender,$pageIndex)); return true; } else if(strcasecmp($command,self::CMD_PAGE_NEXT)===0) { $pageIndex=$this->getCurrentPageIndex()+1; $this->onPageIndexChanged(new TPagerPageChangedEventParameter($sender,$pageIndex)); return true; } else if(strcasecmp($command,self::CMD_PAGE_PREV)===0) { $pageIndex=$this->getCurrentPageIndex()-1; $this->onPageIndexChanged(new TPagerPageChangedEventParameter($sender,$pageIndex)); return true; } else if(strcasecmp($command,self::CMD_PAGE_FIRST)===0) { $this->onPageIndexChanged(new TPagerPageChangedEventParameter($sender,0)); return true; } else if(strcasecmp($command,self::CMD_PAGE_LAST)===0) { $this->onPageIndexChanged(new TPagerPageChangedEventParameter($sender,$this->getPageCount()-1)); return true; } return false; } else return false; } } /** * TPagerPageChangedEventParameter class * * TPagerPageChangedEventParameter encapsulates the parameter data for * {@link TPager::onPageIndexChanged PageIndexChanged} event of {@link TPager} controls. * * The {@link getCommandSource CommandSource} property refers to the control * that originally raises the OnCommand event, while {@link getNewPageIndex NewPageIndex} * returns the new page index carried with the page command. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Web.UI.WebControls * @since 3.0.2 */ class TPagerPageChangedEventParameter extends TEventParameter { /** * @var integer new page index */ private $_newIndex; /** * @var TControl original event sender */ private $_source=null; /** * Constructor. * @param TControl the control originally raises the <b>OnCommand</b> event. * @param integer new page index */ public function __construct($source,$newPageIndex) { $this->_source=$source; $this->_newIndex=$newPageIndex; } /** * @return TControl the control originally raises the <b>OnCommand</b> event. */ public function getCommandSource() { return $this->_source; } /** * @return integer new page index */ public function getNewPageIndex() { return $this->_newIndex; } } /** * TPagerMode class. * TPagerMode defines the enumerable type for the possible modes that a {@link TPager} control can take. * * The following enumerable values are defined: * - NextPrev: pager buttons are displayed as next and previous pages * - Numeric: pager buttons are displayed as numeric page numbers * - DropDownList: a dropdown list is used to select pages * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Web.UI.WebControls * @since 3.0.4 */ class TPagerMode extends TEnumerable { const NextPrev='NextPrev'; const Numeric='Numeric'; const DropDownList='DropDownList'; } /** * TPagerButtonType class. * TPagerButtonType defines the enumerable type for the possible types of pager buttons. * * The following enumerable values are defined: * - LinkButton: link buttons * - PushButton: form submit buttons * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Web.UI.WebControls * @since 3.0.4 */ class TPagerButtonType extends TEnumerable { const LinkButton='LinkButton'; const PushButton='PushButton'; } ?>