diff options
| author | xue <> | 2006-02-24 03:52:00 +0000 |
|---|---|---|
| committer | xue <> | 2006-02-24 03:52:00 +0000 |
| commit | 8151f972d074b699ce502317e93386b453f5c8ee (patch) | |
| tree | 0f7e8abc91fa10df487da00f17898b649c6fd3e6 /framework/Collections/TPagedList.php | |
| parent | 7b49888da521d113dc5a45cb8429efcf245c03cf (diff) | |
added TPagedList.
Diffstat (limited to 'framework/Collections/TPagedList.php')
| -rw-r--r-- | framework/Collections/TPagedList.php | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/framework/Collections/TPagedList.php b/framework/Collections/TPagedList.php new file mode 100644 index 00000000..354d5343 --- /dev/null +++ b/framework/Collections/TPagedList.php @@ -0,0 +1,415 @@ +<?php
+/**
+ * TPagedList, TPagedListFetchDataEventParameter, TPagedListPageChangedEventParameter 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 $Revision: $ $Date: $
+ * @package System.Collections
+ */
+
+/**
+ * Includes TPagedListIterator class
+ */
+Prado::using('System.Collections.TPagedDataSource');
+
+/**
+ * TPagedList class
+ *
+ * TPagedList implements a list with paging functionality.
+ *
+ * TPagedList works in one of two modes, managed paging or customized paging,
+ * specified by {@link setCustomPaging CustomPaging}.
+ * - Managed paging ({@link setCustomPaging CustomPaging}=false) :
+ * the list is assumed to contain all data and it will manage which page
+ * of data are available to user.
+ * - Customized paging ({@link setCustomPaging CustomPaging}=true) :
+ * the list is assumed to contain only one page of data. An {@link onFetchData OnFetchData}
+ * event will be raised if the list changes to a different page.
+ * Developers can attach a handler to the event and supply the needed data.
+ * The event handler can be written as follows,
+ * <code>
+ * public function fetchData($sender,$param)
+ * {
+ * $offset=$param->Offset; // beginning index of the data needed
+ * $limit=$param->Limit; // maximum number of data items needed
+ * // get data according to the above two parameters
+ * $param->Data=$data;
+ * }
+ * </code>
+ *
+ * Data in TPagedList can be accessed like an integer-indexed array and can
+ * be traversed using foreach. For example,
+ * <code>
+ * $count=$list->Count;
+ * for($index=0;$index<$count;++$index)
+ * echo $list[$index];
+ * foreach($list as $index=>$item) // traverse each item in the list
+ * </code>
+ *
+ * The {@link setPageSize PageSize} property specifies the number of items in each page.
+ * To access different page of data in the list, set {@link setCurrentPageIndex CurrentPageIndex}
+ * or call {@link nextPage()}, {@link previousPage()}, or {@link gotoPage()}.
+ * The total number of pages can be obtained by {@link getPageCount() PageCount}.
+ *
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Revision: $ $Date: $
+ * @package System.Collections
+ * @since 3.0
+ */
+class TPagedList extends TList
+{
+ /**
+ * @var boolean whether to allow custom paging
+ */
+ private $_customPaging=false;
+ /**
+ * @var integer number of items in each page
+ */
+ private $_pageSize=10;
+ /**
+ * @var integer current page index
+ */
+ private $_currentPageIndex=0;
+ /**
+ * @var integer user-assigned number of items in data source
+ */
+ private $_virtualCount=-1;
+
+ /**
+ * Constructor.
+ * @param array|Iterator the intial data. Default is null, meaning no initialization.
+ * @param boolean whether the list is read-only. Always true for paged list.
+ */
+ public function __construct($data=null,$readOnly=false)
+ {
+ parent::__construct($data,true);
+ }
+
+ /**
+ * @return boolean whether to use custom paging. Defaults to false.
+ */
+ public function getCustomPaging()
+ {
+ return $this->_customPaging;
+ }
+
+ /**
+ * @param boolean whether to allow custom paging
+ */
+ public function setCustomPaging($value)
+ {
+ $this->_customPaging=TPropertyValue::ensureBoolean($value);
+ }
+
+ /**
+ * @return integer number of items in each page. Defaults to 10.
+ */
+ public function getPageSize()
+ {
+ return $this->_pageSize;
+ }
+
+ /**
+ * @param integer number of items in each page
+ */
+ public function setPageSize($value)
+ {
+ if(($value=TPropertyValue::ensureInteger($value))>0)
+ $this->_pageSize=$value;
+ else
+ throw new TInvalidDataValueException('pagedlist_pagesize_invalid');
+ }
+
+ /**
+ * @return integer current page index. Defaults to 0.
+ */
+ public function getCurrentPageIndex()
+ {
+ return $this->_currentPageIndex;
+ }
+
+ /**
+ * @param integer current page index
+ * @throws TInvalidDataValueException if the page index is out of range
+ */
+ public function setCurrentPageIndex($value)
+ {
+ if($this->gotoPage($value=TPropertyValue::ensureInteger($value))===false)
+ throw new TInvalidDataValueException('pagedlist_currentpageindex_invalid');
+ }
+
+ /**
+ * Raises <b>OnPageIndexChanged</b> event.
+ * This event is raised each time when the list changes to a different page.
+ * @param TPagedListPageChangedEventParameter event parameter
+ */
+ public function onPageIndexChanged($param)
+ {
+ $this->raiseEvent('OnPageIndexChanged',$this,$param);
+ }
+
+ /**
+ * Raises <b>OnFetchData</b> event.
+ * This event is raised each time when the list changes to a different page
+ * and needs the new page of data. This event can only be raised when
+ * {@link setCustomPaging CustomPaging} is true.
+ * @param TPagedListFetchDataEventParameter event parameter
+ */
+ public function onFetchData($param)
+ {
+ $this->raiseEvent('OnFetchData',$this,$param);
+ }
+
+ /**
+ * Changes to a page with the specified page index.
+ * @param integer page index
+ * @return integer|boolean the new page index, false if page index is out of range.
+ */
+ public function gotoPage($pageIndex)
+ {
+ if($pageIndex===$this->_currentPageIndex)
+ return $pageIndex;
+ if($this->_customPaging)
+ {
+ if($pageIndex>=0 && ($this->_virtualCount<0 || $pageIndex<$this->getPageCount())
+ {
+ $param=new TPagedListFetchDataEventParameter($this->_pageSize*$pageIndex,$this->_pageSize);
+ $this->onFetchData($param);
+ if(($data=$param->getData())!==null)
+ {
+ $this->setReadOnly(false);
+ $this->copyFrom($data);
+ $this->setReadOnly(true);
+ $oldPage=$this->_currentPageIndex;
+ $this->_currentPageIndex=$pageIndex;
+ $this->onPageIndexChangedEvent(new TPagedListPageChangedEventParameter($oldPage));
+ return $pageIndex;
+ }
+ else
+ return false;
+ }
+ else
+ return false;
+ }
+ else
+ {
+ if($pageIndex>=0 && $pageIndex<$this->getPageCount())
+ {
+ $this->_currentPageIndex=$pageIndex;
+ $this->onPageIndexChangedEvent(null);
+ return $pageIndex;
+ }
+ else
+ return false;
+ }
+ }
+
+ /**
+ * Switches to the next page.
+ * @return integer|boolean the new page index, false if next page is not availabe.
+ */
+ public function nextPage()
+ {
+ return $this->gotoPage($this->_currentPageIndex+1);
+ }
+
+ /**
+ * Switches to the previous page.
+ * @return integer|boolean the new page index, false if previous page is not availabe.
+ */
+ public function previousPage()
+ {
+ return $this->gotoPage($this->_currentPageIndex-1);
+ }
+
+ /**
+ * @return integer user-assigned number of items in data source. Defaults to 0.
+ */
+ public function getVirtualCount()
+ {
+ return $this->_virtualCount;
+ }
+
+ /**
+ * @param integer user-assigned number of items in data source
+ */
+ public function setVirtualCount($value)
+ {
+ if(($value=TPropertyValue::ensureInteger($value))<0)
+ $value=-1;
+ $this->_virtualCount=$value;
+ }
+
+ /**
+ * @return integer number of pages, -1 if under custom paging mode and {@link setVirtualCount VirtualCount} is not set.
+ */
+ public function getPageCount()
+ {
+ if($this->_customPaging)
+ {
+ if($this->_virtualCount>=0)
+ return (int)(($this->_virtualCount+$this->_pageSize-1)/$this->_pageSize);
+ else
+ return -1;
+ }
+ else
+ return (int)(($this->getCount()+$this->_pageSize-1)/$this->_pageSize);
+ }
+
+ /**
+ * @return boolean whether the current page is the first page
+ */
+ public function getIsFirstPage()
+ {
+ return $this->_currentPageIndex===0;
+ }
+
+ /**
+ * @return boolean whether the current page is the last page
+ */
+ public function getIsLastPage()
+ {
+ return $this->_currentPageIndex===$this->getPageCount()-1;
+ }
+
+ /**
+ * @return integer the number of items in current page
+ */
+ public function getCount()
+ {
+ if($this->_customPaging)
+ return parent::getCount();
+ else
+ {
+ if($this->_currentPageIndex===$this->getPageCount()-1)
+ return parent::getCount()-$this->_pageSize*$this->_currentPageIndex;
+ else
+ return $this->_pageSize;
+ }
+ }
+
+ /**
+ * @return Iterator iterator
+ */
+ public function getIterator()
+ {
+ if($this->_customPaging)
+ return parent::getIterator();
+ else
+ return new TPagedListIterator($this,$this->_pageSize*$this->_currentPageIndex,$this->getCount());
+ }
+
+ /**
+ * Returns the item at the specified offset.
+ * This method is exactly the same as {@link offsetGet}.
+ * @param integer the index of the item
+ * @return mixed the item at the index
+ * @throws TInvalidDataValueException if the index is out of the range
+ */
+ public function itemAt($index)
+ {
+ return parent::itemAt($this->_pageSize*$this->_currentPageIndex+$index);
+ }
+
+ /**
+ * @param mixed the item
+ * @return integer the index of the item in the list (0 based), -1 if not found.
+ */
+ public function indexOf($item)
+ {
+ $c=$this->getCount();
+ for($i=0;$i<$c;++$i)
+ if($this->itemAt($i)===$item)
+ return $i;
+ return -1;
+ }
+
+ /**
+ * Returns whether there is an item at the specified offset.
+ * This method is required by the interface ArrayAccess.
+ * @param integer the offset to check on
+ * @return boolean
+ */
+ public function offsetExists($offset)
+ {
+ return ($offset>=0 && $offset<$this->getCount());
+ }
+
+ /**
+ * Returns the item at the specified offset.
+ * This method is required by the interface ArrayAccess.
+ * @param integer the offset to retrieve item.
+ * @return mixed the item at the offset
+ * @throws TInvalidDataValueException if the offset is invalid
+ */
+ public function offsetGet($offset)
+ {
+ return $this->itemAt($offset);
+ }
+
+ /**
+ * @return array the list of items in array
+ */
+ public function toArray()
+ {
+ $c=$this->getCount();
+ $array=array();
+ for($i=0;$i<$c;++$i)
+ $array[$i]=$this->itemAt($i);
+ return $array;
+ }
+}
+
+class TPagedListPageChangedEventParameter extends TEventParameter
+{
+ private $_oldPage;
+
+ public function __construct($oldPage)
+ {
+ $this->_oldPage=$oldPage;
+ }
+
+ public function getOldPage()
+ {
+ return $this->_oldPage;
+ }
+}
+
+class TPagedListFetchDataEventParameter extends TEventParameter
+{
+ private $_offset;
+ private $_limit;
+ private $_data=null;
+
+ public function __construct($offset,$limit)
+ {
+ $this->_offset=$offset;
+ $this->_limit=$limit;
+ }
+
+ public function getOffset()
+ {
+ return $this->_offset;
+ }
+
+ public function getLimit()
+ {
+ return $this->_limit;
+ }
+
+ public function getData()
+ {
+ return $this->_data;
+ }
+
+ public function setData($value)
+ {
+ $this->_data=$value;
+ }
+}
+
+?>
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