From 303edb1dd308d3812102fbe25438e56413cd79a3 Mon Sep 17 00:00:00 2001
From: tof <>
Date: Mon, 13 Oct 2008 13:40:34 +0000
Subject: Added drag and drop components

---
 .gitattributes                                     |   6 +
 .../protected/pages/ActiveControls/DragDrop.page   |  26 ++
 .../protected/pages/ActiveControls/Home.page       |  22 +-
 .../ActiveControls/Samples/DragDrop/Home.page      |  90 +++++++
 .../pages/ActiveControls/Samples/DragDrop/Home.php | 112 +++++++++
 .../Samples/DragDrop/assets/product1.png           | Bin 0 -> 10711 bytes
 .../Samples/DragDrop/assets/product2.png           | Bin 0 -> 9550 bytes
 .../Samples/DragDrop/assets/trash.png              | Bin 0 -> 783 bytes
 .../pages/GettingStarted/NewFeatures.page          |   8 +-
 framework/Web/Javascripts/source/packages.php      |   5 +-
 .../source/prado/activecontrols/dragdrop.js        |  24 ++
 framework/Web/UI/ActiveControls/TDraggable.php     | 152 ++++++++++++
 framework/Web/UI/ActiveControls/TDropContainer.php | 275 +++++++++++++++++++++
 13 files changed, 716 insertions(+), 4 deletions(-)
 create mode 100755 demos/quickstart/protected/pages/ActiveControls/DragDrop.page
 create mode 100755 demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.page
 create mode 100755 demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.php
 create mode 100755 demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product1.png
 create mode 100755 demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product2.png
 create mode 100755 demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/trash.png
 create mode 100755 framework/Web/Javascripts/source/prado/activecontrols/dragdrop.js
 create mode 100755 framework/Web/UI/ActiveControls/TDraggable.php
 create mode 100755 framework/Web/UI/ActiveControls/TDropContainer.php

diff --git a/.gitattributes b/.gitattributes
index 8389fd93..8777ae33 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1277,8 +1277,13 @@ demos/quickstart/protected/pages/ActiveControls/ActiveCustomValidator.page -text
 demos/quickstart/protected/pages/ActiveControls/ActiveHyperLink.page -text
 demos/quickstart/protected/pages/ActiveControls/ActivePager.page -text
 demos/quickstart/protected/pages/ActiveControls/AutoComplete.page -text
+demos/quickstart/protected/pages/ActiveControls/DragDrop.page -text
 demos/quickstart/protected/pages/ActiveControls/Home.page -text
 demos/quickstart/protected/pages/ActiveControls/Introduction.page -text
+demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.page -text
+demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product1.png -text svneol=unset#image/png
+demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product2.png -text svneol=unset#image/png
+demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/trash.png -text svneol=unset#image/png
 demos/quickstart/protected/pages/ActiveControls/Samples/TActiveButton/Home.page -text
 demos/quickstart/protected/pages/ActiveControls/Samples/TActiveButton/Home.php -text
 demos/quickstart/protected/pages/ActiveControls/Samples/TActiveCheckBox/Home.page -text
@@ -2519,6 +2524,7 @@ framework/Web/Javascripts/source/packages.php -text
 framework/Web/Javascripts/source/prado/activecontrols/activecontrols3.js -text
 framework/Web/Javascripts/source/prado/activecontrols/activedatepicker.js -text
 framework/Web/Javascripts/source/prado/activecontrols/ajax3.js -text
+framework/Web/Javascripts/source/prado/activecontrols/dragdrop.js -text
 framework/Web/Javascripts/source/prado/activecontrols/inlineeditor.js -text
 framework/Web/Javascripts/source/prado/activecontrols/json.js -text
 framework/Web/Javascripts/source/prado/activeratings/blocks.css -text
diff --git a/demos/quickstart/protected/pages/ActiveControls/DragDrop.page b/demos/quickstart/protected/pages/ActiveControls/DragDrop.page
new file mode 100755
index 00000000..0969ddd0
--- /dev/null
+++ b/demos/quickstart/protected/pages/ActiveControls/DragDrop.page
@@ -0,0 +1,26 @@
+<com:TContent ID="body">
+<!-- $Id$ -->
+<h1>TDropContainer</h1>
+<com:DocLink ClassPath="System.Web.UI.ActiveControls.TDropContainer" />
+
+<p class="block-content"><tt>TDropContainer</tt> represent an area where 
+<tt>TDraggable</tt> controls can be dropped.
+When a <tt>TDraggable</tt> is dropped,  a
+callback request is initiated. The <tt>OnCallback</tt> event is raised
+during a callback request and it is raised <strong>after</strong>
+the <tt>OnDropk</tt> event.
+</p>
+
+
+<h1>TDraggable</h1>
+<com:DocLink ClassPath="System.Web.UI.ActiveControls.TDraggable" />
+
+<p class="block-content"><tt>TDraggable</tt> will make its child controls 'draggable'.
+When a <tt>TDraggable</tt> is dropped,  a
+callback request is initiated. The <tt>OnCallback</tt> event is raised
+during a callback request and it is raised <strong>after</strong>
+the <tt>OnDropk</tt> event.
+</p>
+<com:RunBar PagePath="ActiveControls.Samples.DragDrop.Home" />
+
+<div class="last-modified">$Id$</div></com:TContent>
\ No newline at end of file
diff --git a/demos/quickstart/protected/pages/ActiveControls/Home.page b/demos/quickstart/protected/pages/ActiveControls/Home.page
index 5cf4ab17..3cd9b0aa 100644
--- a/demos/quickstart/protected/pages/ActiveControls/Home.page
+++ b/demos/quickstart/protected/pages/ActiveControls/Home.page
@@ -160,6 +160,12 @@ TActiveButton</a> control. See also the later part of the <a href="?page=Tutoria
 	* <a href="?page=ActiveControls.ValueTriggeredCallback">TValueTriggeredCallback</a>
 	monitors (using a timer) an attribute of an HTML element and triggers a callback request
 	when the attribute value changes.
+	</li>
+	
+	<li>
+	<a href="?page=ActiveControls.DrapDrop">TDropContainer & TDraggable</a> represents drag and drop containers. 
+		The former will make its child controls "draggable" while the latter will raise a callback when a draggable
+		control is dropped on it.
 	</li>
 
 </ul>
@@ -310,7 +316,21 @@ if Javascript was disabled on the client's browser.</p>
 	<a href="?page=ActiveControls.ValueTriggeredCallback">TValueTriggeredCallback</a>
 	</td>
 	<td>Yes</td><td>No</td>
-  </tr>
+  </tr>
+  
+  <tr><td>
+  	<a href="?page=ActiveControls.DragDrop">TDropContainer</a>
+  	</td>
+  	<td>Yes</td><td>No</td>
+  </tr>
+
+  <tr><td>
+  	<a href="?page=ActiveControls.DragDrop">TDraggable</a>
+  	</td>
+  	<td>No</td><td>No</td>
+  </tr>
+
+  
 </table>
 
 <h2 id="128036">Active Control Infrastructure Classes</h2>
diff --git a/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.page b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.page
new file mode 100755
index 00000000..89d64110
--- /dev/null
+++ b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.page
@@ -0,0 +1,90 @@
+<com:TContent id="body">
+<style>
+.cart {
+	border: 1px solid #E8A400;
+	background-color: white;
+	padding: 8px;
+	width: 500px;
+	height: 150px;
+}
+
+.cart-hover {
+	background-color: #E8A400;
+}
+
+.cart-items {
+	width: 30px;
+	height: 30px;
+}
+
+.products {
+	float: left;
+	width: 100px;
+	height: 100px;
+	margin-right: 10px;
+}
+
+.draggable {
+	cursor: move
+}
+
+.removable {
+}
+
+.trash {
+	width: 50px;
+	height: 50px;
+	border: 1px solid black;
+}
+
+.trash-hover {
+	background-image: url(<%~ assets/trash.png%>);
+}
+
+</style>
+<h1>Drag &amp; Drop demo !</h1>
+
+<h2>Product List :</h2>
+
+<div style="margin-bottom: 20px; height: 120px">
+
+<com:TRepeater Id="ProductList" DataKeyField="ProductId">
+	<prop:ItemTemplate>
+		<com:TDraggable CssClass="products draggable" >
+		<com:TImage ImageUrl=<%#$this->Data['ProductImageUrl']%> />
+		</com:TDraggable>
+	</prop:ItemTemplate>
+</com:TRepeater>
+</div>
+<h2>Your shopping cart :</h2>
+<com:TDropContainer CssClass="cart" Id="cart"
+	AcceptCssClass="draggable" 
+	HoverCssClass="cart-hover"
+	OnDrop="addItemToCart"
+	OnCallback="redrawCart"
+	>
+	<com:TRepeater id="ShoppingList" DataKeyField="ProductId">
+		<prop:EmptyTemplate>
+			Your shopping cart is empty, please add some items !
+		</prop:EmptyTemplate>
+		<prop:ItemTemplate>
+			<com:TDraggable CssClass="removable" 
+				Revert="true" 
+				Handle="<%=$this->itemImage->ClientId%>" 
+				Ghosting=<%#($this->Data['ProductCount'] > 1)%> 
+				>
+			<com:TImage id="itemImage" CssClass="cart-items" Style="cursor:move" ImageUrl=<%#$this->Data['ProductImageUrl']%>/>
+			<com:TLabel id="itemTitle" Text=<%#$this->Data['ProductTitle']%>/>
+			<com:TLabel id="itemCount" Text="(<%#$this->Data['ProductCount']%>)" />
+			</com:TDraggable>
+		</prop:ItemTemplate>
+	</com:TRepeater>
+</com:TDropContainer>
+<h2>Remove Items from cart by dropping them here</h2>
+<com:TDropContainer CssClass="trash" id="trash"
+	AcceptCssClass="removable"
+	OnDrop="removeItemFromCart"
+	OnCallback="redrawCart"
+	HoverCssClass="trash-hover"
+/>
+</com:TContent>
diff --git a/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.php b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.php
new file mode 100755
index 00000000..276ee6a4
--- /dev/null
+++ b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/Home.php
@@ -0,0 +1,112 @@
+<?php
+
+prado::using ('System.Web.UI.ActiveControls.*');
+
+class Home extends TPage
+{
+	public function onInit ($param)
+	{
+		parent::onInit($param);
+		if (!$this->getIsPostBack() && !$this->getIsCallBack())
+		{
+			
+			$this->populateProductList();
+			$this->populateShoppingList();
+		}
+	}
+	
+	private function getProductData ()
+	{
+		return array (
+			array (
+				'ProductId' => 'Product1',
+				'ProductImageUrl' => $this->publishAsset('assets/product1.png'),
+				'ProductTitle' => 'Cup'
+			),
+			array (
+				'ProductId' => 'Product2',
+				'ProductImageUrl' => $this->publishAsset('assets/product2.png'),
+				'ProductTitle' => 'T-Shirt'
+			)
+		);
+	}
+	
+	private function getProduct ($key)
+	{
+		foreach ($this->getProductData() as $product)
+			if ($product['ProductId']==$key) return $product;
+		return null;	
+	}
+	
+	protected function populateProductList ()
+	{
+		$this->ProductList->DataSource=$this->getProductData();
+		$this->ProductList->Databind();
+	}
+	
+	protected function populateShoppingList ()
+	{
+		$this->ShoppingList->DataSource=$this->getShoppingListData();
+		$this->ShoppingList->Databind();
+		
+	}
+	
+	
+	public function getShoppingListData ()
+	{
+		return $this->getViewState('ShoppingList', array ());
+	}
+	
+	public function setShoppingListData ($value)
+	{
+		$this->setViewState('ShoppingList', TPropertyValue::ensureArray($value), array ());
+	}
+	
+	public function addItemToCart ($sender, $param)
+	{
+		$control=$param->getDroppedControl();
+		// Get the Key from the repeater item
+		$item=$control->getNamingContainer();
+		$key=$this->ProductList->getDataKeys()->itemAt($item->getItemIndex());
+		$product=$this->getProduct($key);
+		$shoppingList=$this->getShoppingListData();
+		if (isset ($shoppingList[$key]))
+		{
+			// Already an item of this type, increment counter
+			$shoppingList[$key]['ProductCount']++;
+		}
+		else
+		{
+			// Add an item to the shopping list
+			$shoppingList[$key]=$product;
+			$shoppingList[$key]['ProductCount']=1;
+		}
+		$this->setShoppingListData($shoppingList);
+		
+	}
+	
+	public function removeItemFromCart ($sender, $param)
+	{
+		$control=$param->getDroppedControl();
+		$item=$control->getNamingContainer();
+		$key=$this->ShoppingList->getDataKeys()->itemAt($item->getItemIndex());
+		$shoppingList=$this->getShoppingListData();
+		if (isset($shoppingList[$key]))
+		{
+			if ($shoppingList[$key]['ProductCount'] > 1)
+				$shoppingList[$key]['ProductCount'] --;
+			else
+				unset($shoppingList[$key]);
+		}
+		$this->setShoppingListData($shoppingList);
+		
+	}
+	
+	public function redrawCart ($sender, $param)
+	{
+		$this->populateShoppingList();
+		$this->cart->render($param->NewWriter);
+		
+	}
+}
+?>
\ No newline at end of file
diff --git a/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product1.png b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product1.png
new file mode 100755
index 00000000..ae03d551
Binary files /dev/null and b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product1.png differ
diff --git a/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product2.png b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product2.png
new file mode 100755
index 00000000..25e81ad7
Binary files /dev/null and b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/product2.png differ
diff --git a/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/trash.png b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/trash.png
new file mode 100755
index 00000000..184f7628
Binary files /dev/null and b/demos/quickstart/protected/pages/ActiveControls/Samples/DragDrop/assets/trash.png differ
diff --git a/demos/quickstart/protected/pages/GettingStarted/NewFeatures.page b/demos/quickstart/protected/pages/GettingStarted/NewFeatures.page
index 66e3111d..51dbb981 100644
--- a/demos/quickstart/protected/pages/GettingStarted/NewFeatures.page
+++ b/demos/quickstart/protected/pages/GettingStarted/NewFeatures.page
@@ -4,7 +4,13 @@
 
 <p id="40005" class="block-content">
 This page summarizes the main new features that are introduced in each PRADO release.
-</p>
+</p>
+
+<h2>Version 3.1.3</h2>
+<ul>
+<li>Added <a href="?page=ActiveControls.DragDrop">Drag and drop controls</a></li>
+<li>Added TActiveDatePicker control</li>
+</ul>
 
 <h2>Version 3.1.2</h2>
 <ul>
diff --git a/framework/Web/Javascripts/source/packages.php b/framework/Web/Javascripts/source/packages.php
index 7c0a1674..b19a5d18 100644
--- a/framework/Web/Javascripts/source/packages.php
+++ b/framework/Web/Javascripts/source/packages.php
@@ -47,7 +47,8 @@ $packages = array(
 	),
 
 	'dragdrop'=>array(
-		SCRIPTACULOUS_DIR.'/dragdrop.js'
+		SCRIPTACULOUS_DIR.'/dragdrop.js',
+		'prado/activecontrols/dragdrop.js'
 	),
 
 	'slider'=>array(
@@ -78,7 +79,7 @@ $dependencies = array(
 		'datepicker'	=> array('prado', 'datepicker'),
 		'colorpicker'	=> array('prado', 'colorpicker'),
 		'ajax'			=> array('prado', 'effects', 'ajax'),
-		'dragdrop'		=> array('prado', 'effects', 'dragdrop'),
+		'dragdrop'		=> array('prado', 'effects', 'ajax', 'dragdrop'),
 		'slider'		=> array('prado', 'slider'),
 		'keyboard'		=> array('prado', 'keyboard'),
 		'tabpanel'		=> array('prado', 'tabpanel'),
diff --git a/framework/Web/Javascripts/source/prado/activecontrols/dragdrop.js b/framework/Web/Javascripts/source/prado/activecontrols/dragdrop.js
new file mode 100755
index 00000000..0b42afd5
--- /dev/null
+++ b/framework/Web/Javascripts/source/prado/activecontrols/dragdrop.js
@@ -0,0 +1,24 @@
+/**
+ * DropContainer control
+ */
+ 
+Prado.WebUI.DropContainer = Class.extend(Prado.WebUI.CallbackControl);
+
+Object.extend(Prado.WebUI.DropContainer.prototype,
+{
+	initialize: function(options)
+	{
+		this.options = options;
+		Object.extend (this.options, 
+		{
+			onDrop: this.onDrop.bind(this)
+		});
+		
+		Droppables.add (options.ID, this.options);
+	},
+	
+	onDrop: function(dragElement, dropElement)
+	{
+		Prado.Callback(this.options.EventTarget, dragElement.id, null, this.options);
+	}
+});
diff --git a/framework/Web/UI/ActiveControls/TDraggable.php b/framework/Web/UI/ActiveControls/TDraggable.php
new file mode 100755
index 00000000..e4e4c4c4
--- /dev/null
+++ b/framework/Web/UI/ActiveControls/TDraggable.php
@@ -0,0 +1,152 @@
+<?php
+/**
+ * TDraggable class file
+ * 
+ * @author Christophe BOULAIN (Christophe.Boulain@gmail.com)
+ * @copyright Copyright &copy; 2008, PradoSoft
+ * @license http://www.pradosoft.com/license
+ * @version $Id$
+ */
+
+/**
+ * TDraggable is a control which can be dragged
+ * 
+ * This control will make "draggable" control.  
+ * 
+ * @author Christophe BOULAIN (Christophe.Boulain@gmail.com)
+ * @copyright Copyright &copy; 2008, PradoSoft
+ * @license http://www.pradosoft.com/license
+ * @version $Id$
+ */
+class TDraggable extends TPanel 
+{
+	/**
+	 * Set the handle id or css class
+	 * @param string
+	 */
+	public function setHandle ($value)
+	{
+		$this->setViewState('DragHandle', TPropertyValue::ensureString($value), null);
+	}
+	
+	/**
+	 * Get the handle id or css class
+	 * @return string
+	 */
+	public function getHandle ()
+	{
+		return $this->getViewState('DragHandle', null);
+	}
+	
+	/**
+	 * Determine if draggable element should revert to it orginal position
+	 * upon release in an non-droppable container.
+	 * @return boolean true to revert
+	 */
+	public function getRevert()
+	{
+		return $this->getViewState('Revert', true);
+	}
+	
+	/**
+	 * Sets whether the draggable element should revert to it orginal position
+	 * upon release in an non-droppable container.
+	 * @param boolean true to revert
+	 */
+	public function setRevert($value)
+	{
+		$this->setViewState('Revert', TPropertyValue::ensureBoolean($value), true);
+	}
+	
+	/**
+	 * Determine if the element should be cloned when dragged
+	 * If true, Clones the element and drags the clone, leaving the original in place until the clone is dropped.
+	 * Defaults to false
+	 * @return boolean true to clone the element
+	 */
+	public function getGhosting ()
+	{
+		return $this->getViewState('Ghosting', false);
+	}
+	
+	/**
+	 * Sets wether the element should be cloned when dragged
+	 * If true, Clones the element and drags the clone, leaving the original in place until the clone is dropped.
+	 * Defaults to false
+	 * @return boolean true to clone the element
+	 */
+	public function setGhosting ($value)
+	{
+		$this->setViewState('Ghosting', TPropertyValue::ensureBoolean($value), false);
+	}
+	
+	/**
+	 * Determine if the element should be constrainted in one direction or not
+	 * @return CDraggableConstraint
+	 */
+	public function getConstraint()
+	{
+		return $this->getViewState('Constraint', TDraggableConstraint::None);
+	}
+	
+	/**
+	 * Set wether the element should be constrainted in one direction
+	 * @param CDraggableConstraint
+	 */
+	public function setConstraint($value)
+	{
+		$this->setViewState('Constraint', TPropertyValue::ensureEnum($value, 'TDraggableConstraint'), TDraggableConstraint::None);
+	}
+	
+
+	/**
+	 * Ensure that the ID attribute is rendered and registers the javascript code
+	 * for initializing the active control.
+	 */
+	protected function addAttributesToRender($writer)
+	{
+		parent::addAttributesToRender($writer);
+		$writer->addAttribute('id',$this->getClientID());
+		$cs=$this->getPage()->getClientScript();
+		$cs->registerPradoScript('dragdrop');
+		$options=TJavascript::encode($this->getPostBackOptions());
+		$class=$this->getClientClassName();
+		$code="new {$class}('{$this->getClientId()}', {$options}) ";
+		$cs->registerEndScript(sprintf('%08X', crc32($code)), $code);
+	}
+		
+	/**
+	 * Gets the name of the javascript class responsible for performing postback for this control.
+	 * This method overrides the parent implementation.
+	 * @return string the javascript class name
+	 */
+	protected function getClientClassName ()
+	{
+		return 'Draggable';
+	}
+	
+	/**
+	 * Gets the post back options for this textbox.
+	 * @return array
+	 */
+	protected function getPostBackOptions()
+	{
+		$options['ID'] = $this->getClientID();
+
+		if (($handle=$this->getHandle())!== null) $options['handle']=$handle;
+		$options['revert']=$this->getRevert();
+		if (($constraint=$this->getConstraint())!==TDraggableConstraint::None) $options['constraint']=strtolower($constraint);
+		$options['ghosting']=$this->getGhosting();
+
+		return $options;
+	}
+	
+}
+
+class TDraggableConstraint extends TEnumerable
+{
+	const None='None';
+	const Horizontal='Horizontal';
+	const Vertical='Vertical';
+}
+?>
\ No newline at end of file
diff --git a/framework/Web/UI/ActiveControls/TDropContainer.php b/framework/Web/UI/ActiveControls/TDropContainer.php
new file mode 100755
index 00000000..5d090d95
--- /dev/null
+++ b/framework/Web/UI/ActiveControls/TDropContainer.php
@@ -0,0 +1,275 @@
+<?php
+/**
+ * TDropContainer class file
+ * 
+ * @author Christophe BOULAIN (Christophe.Boulain@gmail.com)
+ * @copyright Copyright &copy; 2008, PradoSoft
+ * @license http://www.pradosoft.com/license
+ * @version $Id$
+ */
+
+/**
+ * Load active control adapter.
+ */
+Prado::using('System.Web.UI.ActiveControls.TActiveControlAdapter');
+/**
+ * Load active panel.
+ */
+Prado::using('System.Web.UI.ActiveControls.TActivePanel');
+
+
+/**
+ * TDropContainer is a panel where TDraggable controls can be dropped.
+ * When a TDraggable component is dropped into a TDropContainer, the {@link OnDrop OnDrop} event is raised.
+ * The {@link TDropContainerEventParameter} param will contain the dropped control. 
+ * 
+ * Properties :
+ * 
+ * <b>{@link setAcceptCssClass AcceptCssClass}</b> : a coma delimited classname of elements that the drop container can accept.
+ * <b>{@link setHoverCssClass HoverCssClass}</b>: CSS classname of the container when a draggable element hovers over the container.
+ * 
+ * Events:
+ * 
+ * <b>{@link OnDrop OnDrop} : raised when a TDraggable control is dropped. The dropped control is encapsulated in the event parameter
+ * 
+ * @author Christophe BOULAIN (Christophe.Boulain@gmail.com)
+ * @copyright Copyright &copy; 2008, PradoSoft
+ * @license http://www.pradosoft.com/license
+ * @version $Id$
+ */
+class TDropContainer extends TPanel implements IActiveControl, ICallbackEventHandler 
+{	
+	private $_container=null;
+	
+	/**
+	 * Creates a new callback control, sets the adapter to
+	 * TActiveControlAdapter. If you override this class, be sure to set the
+	 * adapter appropriately by, for example, by calling this constructor.
+	 */
+	public function __construct()
+	{
+		parent::__construct();
+		$this->setAdapter(new TActiveControlAdapter($this));
+	}
+
+	/**
+	 * @return TBaseActiveControl standard active control options.
+	 */
+	public function getActiveControl()
+	{
+		return $this->getAdapter()->getBaseActiveControl();
+	}
+
+
+	/**
+	 * Gets the Css class name that this container can accept.
+	 * @return string
+	 */
+	public function getAcceptCssClass()
+	{
+		return $this->getViewState('Accepts', '');
+	}
+
+	/**
+	 * Sets the Css class name that this container can accept.
+	 * @param string comma delimited css class names.
+	 */
+	public function setAcceptCssClass($value)
+	{
+		$this->setViewState('Accepts', TPropertyValue::ensureArray($value), '');
+	}
+	
+	/**
+	 * Sets the Css class name used when a draggble element is hovering
+	 * over this container.
+	 * @param string css class name during draggable hover.
+	 */
+	public function setHoverCssClass($value)
+	{
+		$this->setViewState('HoverClass', $value, '');
+	}
+
+	/**
+	 * Gets the Css class name used when a draggble element is hovering
+	 * over this container.
+	 * @return string css class name during draggable hover.
+	 */
+	public function getHoverCssClass()
+	{
+		return $this->getViewState('HoverClass', '');
+	}
+	
+	
+	/**
+	 * Raises callback event. This method is required bu {@link ICallbackEventHandler}
+	 * interface.
+	 * It raises the {@link onDrop OnDrop} event, then, the {@link onCallback OnCallback} event
+	 * This method is mainly used by framework and control developers.
+	 * @param TCallbackEventParameter the parameter associated with the callback event
+	 */
+	public function raiseCallbackEvent($param)
+	{
+		$this->onDrop($param->getCallbackParameter());
+		$this->onCallback($param);
+	}
+	
+	/**
+	 * Raises the onDrop event. 
+	 * The dropped control is encapsulated into a {@link TDropContainerEventParameter}
+	 * 
+	 * @param string $dropControlId
+	 */
+	public function onDrop ($dropControlId)
+	{
+		// Find the control
+		// Warning, this will not work if you have a '_' in your control Id !
+		$control=$this->getPage();
+		$namingContainers=explode(TControl::CLIENT_ID_SEPARATOR, $dropControlId);
+		foreach ($namingContainers as $nc)
+		{
+			$control=$control->findControl($nc);
+		}
+		$this->raiseEvent('OnDrop', $this, new TDropContainerEventParameter ($control));
+		
+	}
+	
+	/**
+	 * This method is invoked when a callback is requested. The method raises
+	 * 'OnCallback' event to fire up the event handlers. If you override this
+	 * method, be sure to call the parent implementation so that the event
+	 * handler can be invoked.
+	 * @param TCallbackEventParameter event parameter to be passed to the event handlers
+	 */
+	public function onCallback($param)
+	{
+		$this->raiseEvent('OnCallback', $this, $param);
+	}
+	
+	/**
+	 * Gets the post back options for this textbox.
+	 * @return array
+	 */
+	protected function getPostBackOptions()
+	{
+		$options['ID'] = $this->getClientID();
+		$options['EventTarget'] = $this->getUniqueID();
+
+		$options['accept'] = TJavascript::encode($this->getAcceptCssClass());
+		$options['hoverclass'] = $this->getHoverCssClass();
+		return $options;
+	}
+	
+	/**
+	 * Gets the name of the javascript class responsible for performing postback for this control.
+	 * This method overrides the parent implementation.
+	 * @return string the javascript class name
+	 */
+	protected function getClientClassName()
+	{
+		return 'Prado.WebUI.DropContainer';
+	}	
+
+
+	/**
+	 * Ensure that the ID attribute is rendered and registers the javascript code
+	 * for initializing the active control.
+	 */
+	protected function addAttributesToRender($writer)
+	{
+		parent::addAttributesToRender($writer);
+		$writer->addAttribute('id',$this->getClientID());
+
+		$this->getPage()->getClientScript()->registerPradoScript('dragdrop');
+
+		$this->getActiveControl()->registerCallbackClientScript(
+			$this->getClientClassName(), $this->getPostBackOptions());
+	}
+	
+	/**
+	 * Creates child control
+	 * Override parent implementation to create a container which will contain all
+	 * child controls. This container will be a TActivePanel, in order to allow user
+	 * to update its content on callback.
+	 */
+	public function createChildControls ()
+	{
+		if ($this->_container===null)
+		{
+			$this->_container=Prado::CreateComponent('System.Web.UI.ActiveControls.TActivePanel');
+			$this->_container->setId($this->getId().'_content');
+			parent::getControls()->add($this->_container);
+		}
+	}
+	
+	/**
+	 * Override parent implementation to return the container control collection.
+	 *
+	 * @return TControlCollection
+	 */
+	public function getControls()
+	{
+		$this->ensureChildControls();
+		return $this->_container->getControls();
+	}
+	
+	/**
+	 * Renders and replaces the panel's content on the client-side.
+	 * When render() is called before the OnPreRender event, such as when render()
+	 * is called during a callback event handler, the rendering
+	 * is defered until OnPreRender event is raised.
+	 * @param THtmlWriter html writer
+	 */
+	public function render ($writer)
+	{
+		if($this->getHasPreRendered())
+		{
+			parent::render($writer);
+			if($this->getActiveControl()->canUpdateClientSide())
+				$this->getPage()->getCallbackClient()->replaceContent($this->_container,$writer);
+		}
+		else
+		{
+			$this->getPage()->getAdapter()->registerControlToRender($this->_container,$writer);
+		}
+	}
+			
+}
+
+/**
+ * TDropContainerEventParameter class
+ * 
+ * TDropContainerEventParameter encapsulate the parameter
+ * data for <b>OnDrop</b> event of TDropContainer components
+ * 
+ * @author Christophe BOULAIN (Christophe.Boulain@ceram.fr)
+ * @copyright Copyright &copy; 2008, PradoSoft
+ * @license http://www.pradosoft.com/license
+ * @version $Id$
+ */
+class TDropContainerEventParameter extends TEventParameter
+{
+	/*
+	 * the id of control which has been dropped
+	 * @var string
+	 */
+	private $_droppedControl;
+	
+	/**
+	 * constructor
+	 *
+	 * @param string the id of control which been dropped
+	 */
+	public function __construct ($control)
+	{
+		$this->_droppedControl=$control;
+	}
+	
+	/**
+	 * @return TDraggable 
+	 */
+	public function getDroppedControl ()
+	{
+		return $this->_droppedControl;
+	}
+}
+?>
\ No newline at end of file
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