Added paging support to all data-bound controls.

Updated TPager accordingly.

5 files changed, 320 insertions, 466 deletions

diff --git a/HISTORY b/HISTORY
index c0eb33fe..6650d07f 100644
--- a/HISTORY
+++ b/HISTORY
@@ -16,6 +16,7 @@ ENH: Ticket#232 - Allow <%# %> and <%= %> embedded within property values (Qiang
 ENH: TRepeater, TDataList and TDataGrid will store data indices in DataKeys if DataKeyField is not set. (Qiang)

 ENH: Added TPageService.BasePageClass property (Qiang)

 ENH: Added TDataGrid.EmptyTemplate property (Qiang)

+ENH: Added paging feature to all TDataBoundControl-derived controls (Qiang)

 NEW: Added TPager (Qiang)

 

 Version 3.0.1 June 4, 2006

diff --git a/framework/Exceptions/messages.txt b/framework/Exceptions/messages.txt
index b5db3613..8bc1cd6f 100644
--- a/framework/Exceptions/messages.txt
+++ b/framework/Exceptions/messages.txt
@@ -300,4 +300,17 @@ stack_data_not_iterable					= TStack can only fetch data from an array or a trav
 stack_empty								= TStack is empty.

 

 queue_data_not_iterable					= TQueue can only fetch data from an array or a traversable object.

-queue_empty								= TQueue is empty.
\ No newline at end of file
+queue_empty								= TQueue is empty.

+

+pager_pagebuttoncount_invalid			= TPager.PageButtonCount must be an integer no less than 1.

+pager_currentpageindex_invalid			= TPager.CurrentPageIndex is out of range.

+pager_pagecount_invalid					= TPager.PageCount cannot be smaller than 0.

+pager_controltopaginate_invalid			= TPager.ControlToPaginate {0} must be a valid ID path pointing to a TDataBoundControl-derived control.

+

+databoundcontrol_pagesize_invalid		= {0}.PageSize must be an integer no smaller than 1.

+databoundcontrol_virtualitemcount_invalid = {0}.VirtualItemCount must be an integer no smaller than 0.

+databoundcontrol_currentpageindex_invalid = {0}.CurrentPageIndex is out of range.

+databoundcontrol_datasource_invalid		= {0}.DataSource is not valid.

+databoundcontrol_datasourceid_inexistent = databoundcontrol_datasourceid_inexistent.

+databoundcontrol_datasourceid_invalid	= databoundcontrol_datasourceid_invalid

+databoundcontrol_datamember_invalid		= databoundcontrol_datamember_invalid
\ No newline at end of file
diff --git a/framework/Web/UI/WebControls/TDataBoundControl.php b/framework/Web/UI/WebControls/TDataBoundControl.php
index 09023b66..798f9155 100644
--- a/framework/Web/UI/WebControls/TDataBoundControl.php
+++ b/framework/Web/UI/WebControls/TDataBoundControl.php
@@ -12,6 +12,7 @@
 

 Prado::using('System.Web.UI.WebControls.TDataSourceControl');

 Prado::using('System.Web.UI.WebControls.TDataSourceView');

+Prado::using('System.Collections.TPagedDataSource');

 

 /**

  * TDataBoundControl class.

@@ -20,7 +21,22 @@ Prado::using('System.Web.UI.WebControls.TDataSourceView');
  * data from data sources. It provides basic properties and methods that allow

  * the derived controls to associate with data sources and retrieve data from them.

  *

- * TBC...

+ * TBC....

+ *

+ * TDataBoundControl is equipped with paging capabilities. By setting

+ * {@link setAllowPaging AllowPaging} to true, the input data will be paged

+ * and only one page of data is actually populated into the data-bound control.

+ * This saves a lot of memory when dealing with larget datasets.

+ *

+ * To specify the number of data items displayed on each page, set

+ * the {@link setPageSize PageSize} property, and to specify which

+ * page of data to be displayed, set {@link setCurrentPageIndex CurrentPageIndex}.

+ *

+ * When the size of the original data is too big to be loaded all in the memory,

+ * one can enable custom paging. In custom paging, the total number of data items

+ * is specified manually via {@link setVirtualItemCount VirtualItemCount},

+ * and the data source only needs to contain the current page of data. To enable

+ * custom paging, set {@link setAllowCustomPaging AllowCustomPaging} to true.

  *

  * @author Qiang Xue <qiang.xue@gmail.com>

  * @version $Revision: $  $Date: $

@@ -152,6 +168,109 @@ abstract class TDataBoundControl extends TWebControl
 	}

 

 	/**

+	 * @return boolean whether paging is enabled. Defaults to false.

+	 */

+	public function getAllowPaging()

+	{

+		return $this->getViewState('AllowPaging',false);

+	}

+

+	/**

+	 * @param boolean whether paging is enabled

+	 */

+	public function setAllowPaging($value)

+	{

+		$this->setViewState('AllowPaging',TPropertyValue::ensureBoolean($value),false);

+	}

+

+	/**

+	 * @return boolean whether the custom paging is enabled. Defaults to false.

+	 */

+	public function getAllowCustomPaging()

+	{

+		return $this->getViewState('AllowCustomPaging',false);

+	}

+

+	/**

+	 * Sets a value indicating whether the custom paging should be enabled.

+	 * When the pager is in custom paging mode, the {@link setVirtualItemCount VirtualItemCount}

+	 * property is used to determine the paging, and the data items in the

+	 * {@link setDataSource DataSource} are considered to be in the current page.

+	 * @param boolean whether the custom paging is enabled

+	 */

+	public function setAllowCustomPaging($value)

+	{

+		$this->setViewState('AllowCustomPaging',TPropertyValue::ensureBoolean($value),false);

+	}

+

+	/**

+	 * @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

+	 */

+	public function setCurrentPageIndex($value)

+	{

+		if(($value=TPropertyValue::ensureInteger($value))<0)

+			throw new TInvalidDataValueException('databoundcontrol_currentpageindex_invalid',get_class($this));

+		$this->setViewState('CurrentPageIndex',$value,0);

+	}

+

+	/**

+	 * @return integer the number of data items on each page. Defaults to 10.

+	 */

+	public function getPageSize()

+	{

+		return $this->getViewState('PageSize',10);

+	}

+

+	/**

+	 * @param integer the number of data items on each page.

+	 * @throws TInvalidDataValueException if the value is less than 1

+	 */

+	public function setPageSize($value)

+	{

+		if(($value=TPropertyValue::ensureInteger($value))<1)

+			throw new TInvalidDataValueException('databoundcontrol_pagesize_invalid',get_class($this));

+		$this->setViewState('PageSize',TPropertyValue::ensureInteger($value),10);

+	}

+

+	/**

+	 * @return integer number of pages of data items available

+	 */

+	public function getPageCount()

+	{

+		return $this->getViewState('PageCount',1);

+	}

+

+	/**

+	 * @return integer virtual number of data items in the data source. Defaults to 0.

+	 * @see setAllowCustomPaging

+	 */

+	public function getVirtualItemCount()

+	{

+		return $this->getViewState('VirtualItemCount',0);

+	}

+

+	/**

+	 * @param integer virtual number of data items in the data source.

+	 * @throws TInvalidDataValueException if the value is less than 0

+	 * @see setAllowCustomPaging

+	 */

+	public function setVirtualItemCount($value)

+	{

+		if(($value=TPropertyValue::ensureInteger($value))<0)

+			throw new TInvalidDataValueException('databoundcontrol_virtualitemcount_invalid',get_class($this));

+		$this->setViewState('VirtualItemCount',$value,0);

+	}

+

+	/**

 	 * Sets a value indicating whether a databind call is required by the data bound control.

 	 * If true and the control has been prerendered while it uses the data source

 	 * specified by {@link setDataSourceID}, a databind call will be called by this method.

@@ -185,6 +304,20 @@ abstract class TDataBoundControl extends TWebControl
 	}

 

 	/**

+	 * @return TPagedDataSource creates a paged data source

+	 */

+	protected function createPagedDataSource()

+	{

+		$ds=new TPagedDataSource;

+		$ds->setCurrentPageIndex($this->getCurrentPageIndex());

+		$ds->setPageSize($this->getPageSize());

+		$ds->setAllowPaging($this->getAllowPaging());

+		$ds->setAllowCustomPaging($this->getAllowCustomPaging());

+		$ds->setVirtualItemCount($this->getVirtualItemCount());

+		return $ds;

+	}

+

+	/**

 	 * Performs databinding.

 	 * This method overrides the parent implementation by calling

 	 * {@link performSelect} which fetches data from data source and does

@@ -197,7 +330,22 @@ abstract class TDataBoundControl extends TWebControl
 		$this->onDataBinding(null);

 		$data=$this->getData();

 		if($data instanceof Traversable)

-			$this->performDataBinding($data);

+		{

+			if($this->getAllowPaging())

+			{

+				$ds=$this->createPagedDataSource();

+				$ds->setDataSource($data);

+				$this->setViewState('PageCount',$ds->getPageCount());

+				if($ds->getCurrentPageIndex()>=$ds->getPageCount())

+					throw new TInvalidDataValueException('databoundcontrol_currentpageindex_invalid',get_class($this));

+				$this->performDataBinding($ds);

+			}

+			else

+			{

+				$this->clearViewState('PageCount');

+				$this->performDataBinding($data);

+			}

+		}

 		$this->setIsDataBound(true);

 		$this->onDataBound(null);

 	}

@@ -336,7 +484,7 @@ abstract class TDataBoundControl extends TWebControl
 		else if(($value instanceof Traversable) || $value===null)

 			return $value;

 		else

-			throw new TInvalidDataTypeException('databoundcontrol_datasource_invalid');

+			throw new TInvalidDataTypeException('databoundcontrol_datasource_invalid',get_class($this));

 	}

 

 	public function getDataMember()

diff --git a/framework/Web/UI/WebControls/TDataGrid.php b/framework/Web/UI/WebControls/TDataGrid.php
index 4fe63f52..342a39ac 100644
--- a/framework/Web/UI/WebControls/TDataGrid.php
+++ b/framework/Web/UI/WebControls/TDataGrid.php
@@ -529,30 +529,6 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 	}

 

 	/**

-	 * @return boolean whether the custom paging is enabled. Defaults to false.

-	 */

-	public function getAllowCustomPaging()

-	{

-		return $this->getViewState('AllowCustomPaging',false);

-	}

-

-	/**

-	 * @param boolean whether the custom paging is enabled

-	 */

-	public function setAllowCustomPaging($value)

-	{

-		$this->setViewState('AllowCustomPaging',TPropertyValue::ensureBoolean($value),false);

-	}

-

-	/**

-	 * @return boolean whether paging is enabled. Defaults to false.

-	 */

-	public function getAllowPaging()

-	{

-		return $this->getViewState('AllowPaging',false);

-	}

-

-	/**

 	 * @return boolean whether sorting is enabled. Defaults to false.

 	 */

 	public function getAllowSorting()

@@ -561,14 +537,6 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 	}

 

 	/**

-	 * @param boolean whether paging is enabled

-	 */

-	public function setAllowPaging($value)

-	{

-		$this->setViewState('AllowPaging',TPropertyValue::ensureBoolean($value),false);

-	}

-

-	/**

 	 * @param boolean whether sorting is enabled

 	 */

 	public function setAllowSorting($value)

@@ -593,74 +561,6 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 	}

 

 	/**

-	 * @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

-	 */

-	public function setCurrentPageIndex($value)

-	{

-		if(($value=TPropertyValue::ensureInteger($value))<0)

-			throw new TInvalidDataValueException('datagrid_currentpageindex_invalid');

-		$this->setViewState('CurrentPageIndex',$value,0);

-	}

-

-	/**

-	 * @return integer the number of rows displayed each page. Defaults to 10.

-	 */

-	public function getPageSize()

-	{

-		return $this->getViewState('PageSize',10);

-	}

-

-	/**

-	 * @param integer the number of rows displayed within a page

-	 * @throws TInvalidDataValueException if the value is less than 1

-	 */

-	public function setPageSize($value)

-	{

-		if(($value=TPropertyValue::ensureInteger($value))<1)

-			throw new TInvalidDataValueException('datagrid_pagesize_invalid');

-		$this->setViewState('PageSize',TPropertyValue::ensureInteger($value),10);

-	}

-

-	/**

-	 * @return integer number of pages of items available

-	 */

-	public function getPageCount()

-	{

-		if($this->_pagedDataSource)

-			return $this->_pagedDataSource->getPageCount();

-		else

-			return $this->getViewState('PageCount',0);

-	}

-

-	/**

-	 * @return integer virtual number of items in the grid. Defaults to 0, meaning not set.

-	 */

-	public function getVirtualItemCount()

-	{

-		return $this->getViewState('VirtualItemCount',0);

-	}

-

-	/**

-	 * @param integer virtual number of items in the grid

-	 * @throws TInvalidDataValueException if the value is less than 0

-	 */

-	public function setVirtualItemCount($value)

-	{

-		if(($value=TPropertyValue::ensureInteger($value))<0)

-			throw new TInvalidDataValueException('datagrid_virtualitemcount_invalid');

-		$this->setViewState('VirtualItemCount',$value,0);

-	}

-

-	/**

 	 * @return boolean whether the header should be displayed. Defaults to true.

 	 */

 	public function getShowHeader()

@@ -955,21 +855,6 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 			}

 			$this->restoreGridFromViewState();

 		}

-		$this->clearViewState('ItemCount');

-	}

-

-	/**

-	 * @return TPagedDataSource creates a paged data source

-	 */

-	private function createPagedDataSource()

-	{

-		$ds=new TPagedDataSource;

-		$ds->setCurrentPageIndex($this->getCurrentPageIndex());

-		$ds->setPageSize($this->getPageSize());

-		$ds->setAllowPaging($this->getAllowPaging());

-		$ds->setAllowCustomPaging($this->getAllowCustomPaging());

-		$ds->setVirtualItemCount($this->getVirtualItemCount());

-		return $ds;

 	}

 

 	/**

@@ -992,42 +877,27 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 	protected function restoreGridFromViewState()

 	{

 		$this->reset();

-		$itemCount=$this->getViewState('ItemCount',0);

-		$this->_pagedDataSource=$ds=$this->createPagedDataSource();

-		$allowPaging=$ds->getAllowPaging();

-		if($allowPaging && $ds->getAllowCustomPaging())

-			$ds->setDataSource(new TDummyDataSource($itemCount));

-		else

-			$ds->setDataSource(new TDummyDataSource($this->getViewState('DataSourceCount',0)));

 

-		if($ds->getCount()===0 && $ds->getCurrentPageIndex()===0 && $this->_emptyTemplate!==null)

-		{

-			$this->_emptyTemplate->instantiateIn($this);

-			$this->_useEmptyTemplate=true;

-			$this->clearViewState('ItemCount');

-			$this->clearViewState('PageCount');

-			$this->clearViewState('DataSourceCount');

-			return;

-		}

+		$allowPaging=$this->getAllowPaging();

+

+		$itemCount=$this->getViewState('ItemCount',0);

+		$dsIndex=$this->getViewState('DataSourceIndex',0);

 

 		$columns=new TList($this->getColumns());

 		$columns->mergeWith($this->_autoColumns);

 

 		$items=$this->getItems();

-		$items->clear();

 

 		if($columns->getCount())

 		{

 			foreach($columns as $column)

 				$column->initialize();

 			if($allowPaging)

-				$this->_topPager=$this->createPager($ds);

+				$this->_topPager=$this->createPager();

 			$this->_header=$this->createItemInternal(-1,-1,self::IT_HEADER,false,null,$columns);

 			$selectedIndex=$this->getSelectedItemIndex();

 			$editIndex=$this->getEditItemIndex();

-			$index=0;

-			$dsIndex=$ds->getAllowPaging()?$ds->getFirstIndexInPage():0;

-			foreach($ds as $data)

+			for($index=0;$index<$itemCount;++$index)

 			{

 				if($index===$editIndex)

 					$itemType=self::IT_EDITITEM;

@@ -1038,14 +908,17 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 				else

 					$itemType=self::IT_ITEM;

 				$items->add($this->createItemInternal($index,$dsIndex,$itemType,false,null,$columns));

-				$index++;

 				$dsIndex++;

 			}

 			$this->_footer=$this->createItemInternal(-1,-1,self::IT_FOOTER,false,null,$columns);

 			if($allowPaging)

-				$this->_bottomPager=$this->createPager($ds);

+				$this->_bottomPager=$this->createPager();

+		}

+		if(!$dsIndex && $this->_emptyTemplate!==null)

+		{

+			$this->_useEmptyTemplate=true;

+			$this->_emptyTemplate->instantiateIn($this);

 		}

-		$this->_pagedDataSource=null;

 	}

 

 	/**

@@ -1060,29 +933,12 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 		$keys=$this->getDataKeys();

 		$keys->clear();

 		$keyField=$this->getDataKeyField();

-		$this->_pagedDataSource=$ds=$this->createPagedDataSource();

-		$ds->setDataSource($data);

-

-		$allowPaging=$ds->getAllowPaging();

-		if($allowPaging && $ds->getCurrentPageIndex()>=$ds->getPageCount())

-			throw new TInvalidDataValueException('datagrid_currentpageindex_invalid');

-

-		if($ds->getCount()===0 && $ds->getCurrentPageIndex()===0 && $this->_emptyTemplate!==null)

-		{

-			$this->_useEmptyTemplate=true;

-			$this->_emptyTemplate->instantiateIn($this);

-			$this->dataBindChildren();

-			$this->clearViewState('ItemCount');

-			$this->clearViewState('PageCount');

-			$this->clearViewState('DataSourceCount');

-			return;

-		}

 

 		// get all columns

 		if($this->getAutoGenerateColumns())

 		{

 			$columns=new TList($this->getColumns());

-			$autoColumns=$this->createAutoColumns($ds);

+			$autoColumns=$this->createAutoColumns($data);

 			$columns->mergeWith($autoColumns);

 		}

 		else

@@ -1090,22 +946,23 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 

 		$items=$this->getItems();

 

+		$index=0;

+		$allowPaging=$this->getAllowPaging() && ($data instanceof TPagedDataSource);

+		$dsIndex=$allowPaging?$data->getFirstIndexInPage():0;

+		$this->setViewState('DataSourceIndex',$dsIndex,0);

 		if($columns->getCount())

 		{

 			foreach($columns as $column)

 				$column->initialize();

-			$allowPaging=$ds->getAllowPaging();

 			if($allowPaging)

-				$this->_topPager=$this->createPager($ds);

+				$this->_topPager=$this->createPager();

 			$this->_header=$this->createItemInternal(-1,-1,self::IT_HEADER,true,null,$columns);

 			$selectedIndex=$this->getSelectedItemIndex();

 			$editIndex=$this->getEditItemIndex();

-			$index=0;

-			$dsIndex=$allowPaging?$ds->getFirstIndexInPage():0;

-			foreach($ds as $key=>$data)

+			foreach($data as $key=>$row)

 			{

 				if($keyField!=='')

-					$keys->add($this->getDataFieldValue($data,$keyField));

+					$keys->add($this->getDataFieldValue($row,$keyField));

 				else

 					$keys->add($key);

 				if($index===$editIndex)

@@ -1116,24 +973,21 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 					$itemType=self::IT_ALTERNATINGITEM;

 				else

 					$itemType=self::IT_ITEM;

-				$items->add($this->createItemInternal($index,$dsIndex,$itemType,true,$data,$columns));

+				$items->add($this->createItemInternal($index,$dsIndex,$itemType,true,$row,$columns));

 				$index++;

 				$dsIndex++;

 			}

 			$this->_footer=$this->createItemInternal(-1,-1,self::IT_FOOTER,true,null,$columns);

 			if($allowPaging)

-				$this->_bottomPager=$this->createPager($ds);

-			$this->setViewState('ItemCount',$index,0);

-			$this->setViewState('PageCount',$ds->getPageCount(),0);

-			$this->setViewState('DataSourceCount',$ds->getDataSourceCount(),0);

+				$this->_bottomPager=$this->createPager();

 		}

-		else

+		$this->setViewState('ItemCount',$index,0);

+		if(!$dsIndex && $this->_emptyTemplate!==null)

 		{

-			$this->clearViewState('ItemCount');

-			$this->clearViewState('PageCount');

-			$this->clearViewState('DataSourceCount');

+			$this->_useEmptyTemplate=true;

+			$this->_emptyTemplate->instantiateIn($this);

+			$this->dataBindChildren();

 		}

-		$this->_pagedDataSource=null;

 	}

 

 	/**

@@ -1191,10 +1045,10 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 		}

 	}

 

-	private function createPager($pagedDataSource)

+	private function createPager()

 	{

 		$pager=new TDataGridPager($this);

-		$this->buildPager($pager,$pagedDataSource);

+		$this->buildPager($pager);

 		$this->onPagerCreated(new TDataGridPagerEventParameter($pager));

 		$this->getControls()->add($pager);

 		return $pager;

@@ -1203,81 +1057,87 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 	/**

 	 * Builds the pager content based on pager style.

 	 * @param TDataGridPager the container for the pager

-	 * @param TPagedDataSource data source bound to the datagrid

 	 */

-	protected function buildPager($pager,$dataSource)

+	protected function buildPager($pager)

 	{

 		switch($this->getPagerStyle()->getMode())

 		{

 			case 'NextPrev':

-				$this->buildNextPrevPager($pager,$dataSource);

+				$this->buildNextPrevPager($pager);

 				break;

 			case 'Numeric':

-				$this->buildNumericPager($pager,$dataSource);

+				$this->buildNumericPager($pager);

 				break;

 		}

 	}

 

 	/**

 	 * Creates a pager button.

-	 * @param string button type, LinkButton or PushButton

+	 * 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)

+	protected function createPagerButton($buttonType,$enabled,$text,$commandName,$commandParameter)

 	{

 		if($buttonType==='LinkButton')

 		{

-			return $enabled?new TLinkButton:new TLabel;

+			if($enabled)

+				$button=new TLinkButton;

+			else

+			{

+				$button=new TLabel;

+				$button->setText($text);

+				return $button;

+			}

 		}

 		else

 		{

 			$button=new TButton;

 			if(!$enabled)

 				$button->setEnabled(false);

-			return $button;

 		}

+		$button->setText($text);

+		$button->setCommandName($commandName);

+		$button->setCommandParameter($commandParameter);

+		$button->setCausesValidation(false);

+		return $button;

 	}

 

 	/**

 	 * Builds a next-prev pager

 	 * @param TDataGridPager the container for the pager

-	 * @param TPagedDataSource data source bound to the datagrid

 	 */

-	protected function buildNextPrevPager($pager,$dataSource)

+	protected function buildNextPrevPager($pager)

 	{

 		$style=$this->getPagerStyle();

 		$buttonType=$style->getButtonType();

 		$controls=$pager->getControls();

-		if($dataSource->getIsFirstPage())

+		$currentPageIndex=$this->getCurrentPageIndex();

+		if($currentPageIndex===0)

 		{

-			$label=$this->createPagerButton($buttonType,false);

-			$label->setText($style->getPrevPageText());

+			$label=$this->createPagerButton($buttonType,false,$style->getPrevPageText(),'','');

 			$controls->add($label);

 		}

 		else

 		{

-			$button=$this->createPagerButton($buttonType,true);

-			$button->setText($style->getPrevPageText());

-			$button->setCommandName(self::CMD_PAGE);

-			$button->setCommandParameter(self::CMD_PAGE_PREV);

-			$button->setCausesValidation(false);

+			$button=$this->createPagerButton($buttonType,true,$style->getPrevPageText(),self::CMD_PAGE,self::CMD_PAGE_PREV);

 			$controls->add($button);

 		}

-		$controls->add('&nbsp;');

-		if($dataSource->getIsLastPage())

+		$controls->add("\n");

+		if($currentPageIndex===$this->getPageCount()-1)

 		{

-			$label=$this->createPagerButton($buttonType,false);

-			$label->setText($style->getNextPageText());

+			$label=$this->createPagerButton($buttonType,false,$style->getNextPageText(),'','');

 			$controls->add($label);

 		}

 		else

 		{

-			$button=$this->createPagerButton($buttonType,true);

-			$button->setText($style->getNextPageText());

-			$button->setCommandName(self::CMD_PAGE);

-			$button->setCommandParameter(self::CMD_PAGE_NEXT);

-			$button->setCausesValidation(false);

+			$button=$this->createPagerButton($buttonType,true,$style->getNextPageText(),self::CMD_PAGE,self::CMD_PAGE_NEXT);

 			$controls->add($button);

 		}

 	}

@@ -1285,15 +1145,14 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 	/**

 	 * Builds a numeric pager

 	 * @param TDataGridPager the container for the pager

-	 * @param TPagedDataSource data source bound to the datagrid

 	 */

-	protected function buildNumericPager($pager,$dataSource)

+	protected function buildNumericPager($pager)

 	{

 		$style=$this->getPagerStyle();

 		$buttonType=$style->getButtonType();

 		$controls=$pager->getControls();

-		$pageCount=$dataSource->getPageCount();

-		$pageIndex=$dataSource->getCurrentPageIndex()+1;

+		$pageCount=$this->getPageCount();

+		$pageIndex=$this->getCurrentPageIndex()+1;

 		$maxButtonCount=$style->getPageButtonCount();

 		$buttonCount=$maxButtonCount>$pageCount?$pageCount:$maxButtonCount;

 		$startPageIndex=1;

@@ -1312,51 +1171,40 @@ class TDataGrid extends TBaseDataList implements INamingContainer
 

 		if($startPageIndex>1)

 		{

-			$button=$this->createPagerButton($buttonType,true);

-			$button->setText($style->getPrevPageText());

-			$button->setCommandName(self::CMD_PAGE);

-			$button->setCommandParameter($startPageIndex-1);

-			$button->setCausesValidation(false);

+			$prevPageIndex=$startPageIndex-1;

+			$button=$this->createPagerButton($buttonType,true,$style->getPrevPageText(),self::CMD_PAGE,"$prevPageIndex");

 			$controls->add($button);

-			$controls->add('&nbsp;');

+			$controls->add("\n");

 		}

 

 		for($i=$startPageIndex;$i<=$endPageIndex;++$i)

 		{

 			if($i===$pageIndex)

 			{

-				$label=$this->createPagerButton($buttonType,false);

-				$label->setText("$i");

+				$label=$this->createPagerButton($buttonType,false,"$i",'','');

 				$controls->add($label);

 			}

 			else

 			{

-				$button=$this->createPagerButton($buttonType,true);

-				$button->setText("$i");

-				$button->setCommandName(self::CMD_PAGE);

-				$button->setCommandParameter($i);

-				$button->setCausesValidation(false);

+				$button=$this->createPagerButton($buttonType,true,"$i",self::CMD_PAGE,"$i");

 				$controls->add($button);

 			}

 			if($i<$endPageIndex)

-				$controls->add('&nbsp;');

+				$controls->add("\n");

 		}

 

 		if($pageCount>$endPageIndex)

 		{

-			$controls->add('&nbsp;');

-			$button=$this->createPagerButton($buttonType,true);

-			$button->setText($style->getNextPageText());

-			$button->setCommandName(self::CMD_PAGE);

-			$button->setCommandParameter($endPageIndex+1);

-			$button->setCausesValidation(false);

+			$controls->add("\n");

+			$nextPageIndex=$endPageIndex+1;

+			$button=$this->createPagerButton($buttonType,true,$style->getNextPageText(),self::CMD_PAGE,"$nextPageIndex");

 			$controls->add($button);

 		}

 	}

 

 	/**

 	 * Automatically generates datagrid columns based on datasource schema

-	 * @param TPagedDataSource data source bound to the datagrid

+	 * @param Traversable data source bound to the datagrid

 	 * @return TDataGridColumnCollection

 	 */

 	protected function createAutoColumns($dataSource)

diff --git a/framework/Web/UI/WebControls/TPager.php b/framework/Web/UI/WebControls/TPager.php
index f802e8d7..0401c4f2 100644
--- a/framework/Web/UI/WebControls/TPager.php
+++ b/framework/Web/UI/WebControls/TPager.php
@@ -10,27 +10,18 @@
  * @package System.Web.UI.WebControls

  */

 

-Prado::using('System.Web.UI.WebControls.TDataBoundControl');

-Prado::using('System.Web.UI.WebControls.TPanelStyle');

-Prado::using('System.Collections.TPagedDataSource');

-Prado::using('System.Collections.TDummyDataSource');

-

 /**

  * TPager class.

  *

- * TPager creates a pager that controls the paging of the data populated

- * to a data-bound control specified by {@link setControlToPaginate ControlToPaginate}.

- * To specify the number of data items displayed on each page, set

- * the {@link setPageSize PageSize} property, and to specify which

- * page of data to be displayed, set {@link setCurrentPageIndex CurrentPageIndex}.

- *

- * When the size of the original data is too big to be loaded all in the memory,

- * one can enable custom paging. In custom paging, the total number of data items

- * is specified manually via {@link setVirtualItemCount VirtualItemCount}, and the data source

- * only needs to contain the current page of data. To enable custom paging,

- * set {@link setAllowCustomPaging AllowCustomPaging} to true.

+ * 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 be in one of three {@link setMode Mode}:

+ * 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.

@@ -39,27 +30,17 @@ Prado::using('System.Collections.TDummyDataSource');
  * 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.

  *

- * When multiple pagers are associated with the same data-bound control,

- * these pagers will do synchronization among each other so that the interaction

- * with one pager will automatically update the UI of the other relevant pagers.

- *

- * The following example shows a typical usage of TPager:

- * <code>

- * $pager->ControlToPaginate="Path.To.Control";

- * $pager->DataSource=$data;

- * $pager->dataBind();

- * </code>

- * Note, the data is assigned to the pager and dataBind() is invoked against the pager.

- * Without the pager, one has to set datasource for the target control and call

- * its dataBind() directly.

+ * Multiple pagers can be associated with the same data-bound control.

  *

  * @author Qiang Xue <qiang.xue@gmail.com>

  * @version $Revision: $  $Date: $

  * @package System.Web.UI.WebControls

  * @since 3.0.2

  */

-class TPager extends TDataBoundControl implements INamingContainer

+class TPager extends TWebControl implements INamingContainer

 {

 	/**

 	 * Command name that TPager understands.

@@ -71,36 +52,6 @@ class TPager extends TDataBoundControl implements INamingContainer
 	const CMD_PAGE_LAST='Last';

 

 	/**

-	 * @var array list of all pagers, used to synchronize their appearance

-	 */

-	static private $_pagers=array();

-

-	/**

-	 * Registers the pager itself to a global list.

-	 * This method overrides the parent implementation and is invoked during

-	 * OnInit control lifecycle.

-	 * @param mixed event parameter

-	 */

-	public function onInit($param)

-	{

-		parent::onInit($param);

-		self::$_pagers[]=$this;

-	}

-

-	/**

-	 * Unregisters the pager from a global list.

-	 * This method overrides the parent implementation and is invoked during

-	 * OnUnload control lifecycle.

-	 * @param mixed event parameter

-	 */

-	public function onUnload($param)

-	{

-		parent::onUnload($param);

-		if(($index=array_search($this,self::$_pagers,true))!==false)

-			unset(self::$_pagers[$index]);

-	}

-

-	/**

 	 * Restores the pager state.

 	 * This method overrides the parent implementation and is invoked when

 	 * the control is loading persistent state.

@@ -108,10 +59,11 @@ class TPager extends TDataBoundControl implements INamingContainer
 	public function loadState()

 	{

 		parent::loadState();

-		if(!$this->getEnableViewState(true))

-			return;

-		if(!$this->getIsDataBound())

-			$this->restoreFromViewState();

+		if($this->getEnableViewState(true))

+		{

+			$this->getControls()->clear();

+			$this->buildPager();

+		}

 	}

 

 	/**

@@ -134,107 +86,6 @@ class TPager extends TDataBoundControl implements INamingContainer
 	}

 

 	/**

-	 * @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

-	 */

-	public function setCurrentPageIndex($value)

-	{

-		if(($value=TPropertyValue::ensureInteger($value))<0)

-			throw new TInvalidDataValueException('pager_currentpageindex_invalid');

-		$this->setViewState('CurrentPageIndex',$value,0);

-	}

-

-	/**

-	 * @return integer the number of data items on each page. Defaults to 10.

-	 */

-	public function getPageSize()

-	{

-		return $this->getViewState('PageSize',10);

-	}

-

-	/**

-	 * @param integer the number of data items on each page.

-	 * @throws TInvalidDataValueException if the value is less than 1

-	 */

-	public function setPageSize($value)

-	{

-		if(($value=TPropertyValue::ensureInteger($value))<1)

-			throw new TInvalidDataValueException('pager_pagesize_invalid');

-		$this->setViewState('PageSize',TPropertyValue::ensureInteger($value),10);

-	}

-

-	/**

-	 * @return integer number of pages

-	 */

-	public function getPageCount()

-	{

-		if(($count=$this->getItemCount())<1)

-			return 1;

-		else

-		{

-			$pageSize=$this->getPageSize();

-			return (int)(($count+$pageSize-1)/$pageSize);

-		}

-	}

-

-	/**

-	 * @return boolean whether the custom paging is enabled. Defaults to false.

-	 */

-	public function getAllowCustomPaging()

-	{

-		return $this->getViewState('AllowCustomPaging',false);

-	}

-

-	/**

-	 * Sets a value indicating whether the custom paging should be enabled.

-	 * When the pager is in custom paging mode, the {@link setVirtualItemCount VirtualItemCount}

-	 * property is used to determine the paging, and the data items in the

-	 * {@link setDataSource DataSource} are considered to be in the current page.

-	 * @param boolean whether the custom paging is enabled

-	 */

-	public function setAllowCustomPaging($value)

-	{

-		$this->setViewState('AllowCustomPaging',TPropertyValue::ensureBoolean($value),false);

-	}

-

-	/**

-	 * @return integer virtual number of data items in the data source. Defaults to 0.

-	 * @see setAllowCustomPaging

-	 */

-	public function getVirtualItemCount()

-	{

-		return $this->getViewState('VirtualItemCount',0);

-	}

-

-	/**

-	 * @param integer virtual number of data items in the data source.

-	 * @throws TInvalidDataValueException if the value is less than 0

-	 * @see setAllowCustomPaging

-	 */

-	public function setVirtualItemCount($value)

-	{

-		if(($value=TPropertyValue::ensureInteger($value))<0)

-			throw new TInvalidDataValueException('pager_virtualitemcount_invalid');

-		$this->setViewState('VirtualItemCount',$value,0);

-	}

-

-	/**

-	 * @return integer total number of items in the datasource.

-	 */

-	public function getItemCount()

-	{

-		return $this->getViewState('ItemCount',0);

-	}

-

-	/**

 	 * @return string pager mode. Defaults to 'NextPrev'.

 	 */

 	public function getMode()

@@ -350,38 +201,57 @@ class TPager extends TDataBoundControl implements INamingContainer
 	}

 

 	/**

-	 * @return TPagedDataSource creates a paged data source

+	 * @return integer the zero-based index of the current page. Defaults to 0.

 	 */

-	private function createPagedDataSource()

+	public function getCurrentPageIndex()

 	{

-		$ds=new TPagedDataSource;

-		$ds->setAllowPaging(true);

-		$customPaging=$this->getAllowCustomPaging();

-		$ds->setAllowCustomPaging($customPaging);

-		$ds->setCurrentPageIndex($this->getCurrentPageIndex());

-		$ds->setPageSize($this->getPageSize());

-		if($customPaging)

-			$ds->setVirtualItemCount($this->getVirtualItemCount());

-		return $ds;

+		return $this->getViewState('CurrentPageIndex',0);

 	}

 

 	/**

-	 * Removes the existing child controls.

+	 * @param integer the zero-based index of the current page

+	 * @throws TInvalidDataValueException if the value is less than 0

 	 */

-	protected function reset()

+	protected function setCurrentPageIndex($value)

 	{

-		$this->getControls()->clear();

+		if(($value=TPropertyValue::ensureInteger($value))<0)

+			throw new TInvalidDataValueException('pager_currentpageindex_invalid');

+		$this->setViewState('CurrentPageIndex',$value,0);

 	}

 

 	/**

-	 * Restores the pager from viewstate.

+	 * @return integer number of pages of data items available

 	 */

-	protected function restoreFromViewState()

+	public function getPageCount()

 	{

-		$this->reset();

-		$ds=$this->createPagedDataSource();

-		$ds->setDataSource(new TDummyDataSource($this->getItemCount()));

-		$this->buildPager($ds);

+		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;

 	}

 

 	/**

@@ -390,66 +260,43 @@ class TPager extends TDataBoundControl implements INamingContainer
 	 * You may override this function to provide your own way of data population.

 	 * @param Traversable the bound data

 	 */

-	protected function performDataBinding($data)

+	public function onPreRender($param)

 	{

-		$this->reset();

+		parent::onPreRender($param);

 

 		$controlID=$this->getControlToPaginate();

 		if(($targetControl=$this->getNamingContainer()->findControl($controlID))===null || !($targetControl instanceof TDataBoundControl))

 			throw new TConfigurationException('pager_controltopaginate_invalid',$controlID);

 

-		$ds=$this->createPagedDataSource();

-		$ds->setDataSource($this->getDataSource());

-		$this->setViewState('ItemCount',$ds->getDataSourceCount());

-

-		$this->buildPager($ds);

-		$this->synchronizePagers($targetControl,$ds);

-

-		$targetControl->setDataSource($ds);

-		$targetControl->dataBind();

-	}

-

-	/**

-	 * Synchronizes the state of all pagers who have the same {@link getControlToPaginate ControlToPaginate}.

-	 * @param TDataBoundControl the control whose content is to be paginated

-	 * @param TPagedDataSource the paged data source associated with the pager

-	 */

-	protected function synchronizePagers($targetControl,$dataSource)

-	{

-		foreach(self::$_pagers as $pager)

+		if($targetControl->getAllowPaging() && $targetControl->getPageCount()>1)

 		{

-			if($pager!==$this && $pager->getNamingContainer()->findControl($pager->getControlToPaginate())===$targetControl)

-			{

-				$pager->reset();

-				$pager->setCurrentPageIndex($dataSource->getCurrentPageIndex());

-				$customPaging=$dataSource->getAllowCustomPaging();

-				$pager->setAllowCustomPaging($customPaging);

-				$pager->setViewState('ItemCount',$dataSource->getDataSourceCount());

-				if($customPaging)

-					$pager->setVirtualItemCount($dataSource->getVirtualItemCount());

-				$pager->buildPager($dataSource);

-			}

+			$this->setVisible(true);

+			$this->getControls()->clear();

+			$this->setPageCount($targetControl->getPageCount());

+			$this->setCurrentPageIndex($targetControl->getCurrentPageIndex());

+			$this->buildPager();

 		}

+		else

+			$this->setVisible(false);

 	}

 

 	/**

 	 * Builds the pager content based on the pager mode.

 	 * Current implementation includes building 'NextPrev', 'Numeric' and 'List' pagers.

 	 * Derived classes may override this method to provide additional pagers.

-	 * @param TPagedDataSource data source bound to the target control

 	 */

-	protected function buildPager($dataSource)

+	protected function buildPager()

 	{

 		switch($this->getMode())

 		{

 			case 'NextPrev':

-				$this->buildNextPrevPager($dataSource);

+				$this->buildNextPrevPager();

 				break;

 			case 'Numeric':

-				$this->buildNumericPager($dataSource);

+				$this->buildNumericPager();

 				break;

 			case 'List':

-				$this->buildListPager($dataSource);

+				$this->buildListPager();

 				break;

 		}

 	}

@@ -494,13 +341,12 @@ class TPager extends TDataBoundControl implements INamingContainer
 

 	/**

 	 * Builds a next-prev pager

-	 * @param TPagedDataSource data source bound to the pager

 	 */

-	protected function buildNextPrevPager($dataSource)

+	protected function buildNextPrevPager()

 	{

 		$buttonType=$this->getButtonType();

 		$controls=$this->getControls();

-		if($dataSource->getIsFirstPage())

+		if($this->getIsFirstPage())

 		{

 			if(($text=$this->getFirstPageText())!=='')

 			{

@@ -523,7 +369,7 @@ class TPager extends TDataBoundControl implements INamingContainer
 			$controls->add($button);

 		}

 		$controls->add("\n");

-		if($dataSource->getIsLastPage())

+		if($this->getIsLastPage())

 		{

 			$label=$this->createPagerButton($buttonType,false,$this->getNextPageText(),'','');

 			$controls->add($label);

@@ -549,14 +395,13 @@ class TPager extends TDataBoundControl implements INamingContainer
 

 	/**

 	 * Builds a numeric pager

-	 * @param TPagedDataSource data source bound to the pager

 	 */

-	protected function buildNumericPager($dataSource)

+	protected function buildNumericPager()

 	{

 		$buttonType=$this->getButtonType();

 		$controls=$this->getControls();

-		$pageCount=$dataSource->getPageCount();

-		$pageIndex=$dataSource->getCurrentPageIndex()+1;

+		$pageCount=$this->getPageCount();

+		$pageIndex=$this->getCurrentPageIndex()+1;

 		$maxButtonCount=$this->getPageButtonCount();

 		$buttonCount=$maxButtonCount>$pageCount?$pageCount:$maxButtonCount;

 		$startPageIndex=1;

@@ -620,15 +465,14 @@ class TPager extends TDataBoundControl implements INamingContainer
 

 	/**

 	 * Builds a dropdown list pager

-	 * @param TPagedDataSource data source bound to the pager

 	 */

-	protected function buildListPager($dataSource)

+	protected function buildListPager()

 	{

 		$list=new TDropDownList;

 		$this->getControls()->add($list);

-		$list->setDataSource(range(1,$dataSource->getPageCount()));

+		$list->setDataSource(range(1,$this->getPageCount()));

 		$list->dataBind();

-		$list->setSelectedIndex($dataSource->getCurrentPageIndex());

+		$list->setSelectedIndex($this->getCurrentPageIndex());

 		$list->setAutoPostBack(true);

 		$list->attachEventHandler('OnSelectedIndexChanged',array($this,'listIndexChanged'));

 	}