added TConditional.

2 files changed, 145 insertions, 1 deletions

diff --git a/framework/Exceptions/messages/messages.txt b/framework/Exceptions/messages/messages.txt
index a105f359..086bdb06 100644
--- a/framework/Exceptions/messages/messages.txt
+++ b/framework/Exceptions/messages/messages.txt
@@ -449,4 +449,6 @@ slider_handle_class_invalid				= TSlider.HandleClass '{0}' is not a valid user c
 cachepagestatepersister_cachemoduleid_invalid = TCachePageStatePersister.CacheModuleID '{0}' does not point to a valid cache module.
 cachepagestatepersister_cache_required  = TCachePageStatePersister requires a cache module to be loaded.
 cachepagestatepersister_timeout_invalid = TCachePageStatePersister.Timeout must be an integer no less than zero.
-cachepagestatepersister_pagestate_corrupted = Page state is corrupted.
\ No newline at end of file
+cachepagestatepersister_pagestate_corrupted = Page state is corrupted.
+
+conditional_condition_invalid			= TConditional.Condition '{0}' is not a valid PHP expression: {1}
\ No newline at end of file
diff --git a/framework/Web/UI/WebControls/TConditional.php b/framework/Web/UI/WebControls/TConditional.php
new file mode 100644
index 00000000..70eedf6d
--- /dev/null
+++ b/framework/Web/UI/WebControls/TConditional.php
@@ -0,0 +1,142 @@
+<?php

+/**

+ * TConditional class file.

+ *

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

+ * @link http://www.pradosoft.com/

+ * @copyright Copyright &copy; 2005-2007 PradoSoft

+ * @license http://www.pradosoft.com/license/

+ * @version $Id$

+ * @package System.Web.UI.WebControls

+ */

+

+/**

+ * TConditional class.

+ *

+ * TConditional displays appropriate content based on the evaluation result

+ * of a PHP expression specified via {@link setCondition Condition}.

+ * If the result is true, it instantiates the template {@link getTrueTemplate TrueTemplate};

+ * otherwise, the template {@link getFalseTemplate FalseTemplate} is instantiated.

+ * The PHP expression is evaluated right before {@link onInit} stage of the control lifecycle.

+ *

+ * Since {@link setCondition Condition} is evaluated at a very early stage, it is recommended

+ * you set {@link setCondition Condition} in template and the expression should not refer to

+ * objects that are available on or after {@link onInit} lifecycle.

+ *

+ * A typical usage of TConditional is shown as following:

+ * <code>

+ * <com:TConditional Condition="$this->User->IsGuest">

+ *   <prop:TrueTemplate>

+ *     <a href="path/to/login">Login</a>

+ *   </prop:TrueTemplate>

+ *   <prop:FalseTemplate>

+ *     <a href="path/to/logout">Logout</a>

+ *   </prop:FalseTemplate>

+ * </com:TConditional>

+ * </code>

+ *

+ * TConditional is very light. It instantiates either {@link getTrueTemplate TrueTemplate}

+ * or {@link getFalseTemplate FalseTemplate}, but never both. And the condition is evaluated only once.

+ *

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

+ * @version $Id$

+ * @package System.Web.UI.WebControls

+ * @since 3.1.1

+ */

+class TConditional extends TControl

+{

+	private $_condition='true';

+	private $_trueTemplate;

+	private $_falseTemplate;

+	private $_creatingChildren=false;

+

+	/**

+	 * Processes an object that is created during parsing template.

+	 * This method overrides the parent implementation by removing

+	 * all contents enclosed in the template tag.

+	 * @param string|TComponent text string or component parsed and instantiated in template

+	 * @see createdOnTemplate

+	 */

+	public function addParsedObject($object)

+	{

+		if($this->_creatingChildren)

+			parent::addParsedObject($object);

+	}

+

+	/**

+	 * Creates child controls.

+	 * This method overrides the parent implementation. It evaluates {@link getCondition Condition}

+	 * and instantiate the corresponding template.

+	 */

+	public function createChildControls()

+	{

+		$this->_creatingChildren=true;

+		$result=true;

+		try

+		{

+			$result=$this->evaluateExpression($this->_condition);

+		}

+		catch(Exception $e)

+		{

+			throw new TInvalidDataValueException('conditional_condition_invalid',$this->_condition,$e->getMessage());

+		}

+		if($result)

+		{

+			if($this->_trueTemplate)

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

+		}

+		else if($this->_falseTemplate)

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

+		$this->_creatingChildren=false;

+	}

+

+	/**

+	 * @return string the PHP expression used for determining which template to use. Defaults to 'true', meaning using TrueTemplate.

+	 */

+	public function getCondition()

+	{

+		return $this->_condition;

+	}

+

+	/**

+	 * @param string the PHP expression used for determining which template to use.

+	 */

+	public function setCondition($value)

+	{

+		$this->_condition=TPropertyValue::ensureString($value);

+	}

+

+	/**

+	 * @return ITemplate the template applied when {@link getCondition Condition} is true.

+	 */

+	public function getTrueTemplate()

+	{

+		return $this->_trueTemplate;

+	}

+

+	/**

+	 * @param ITemplate the template applied when {@link getCondition Condition} is true.

+	 */

+	public function setTrueTemplate(ITemplate $value)

+	{

+		$this->_trueTemplate=$value;

+	}

+

+	/**

+	 * @return ITemplate the template applied when {@link getCondition Condition} is false.

+	 */

+	public function getFalseTemplate()

+	{

+		return $this->_falseTemplate;

+	}

+

+	/**

+	 * @param ITemplate the template applied when {@link getCondition Condition} is false.

+	 */

+	public function setFalseTemplate(ITemplate $value)

+	{

+		$this->_falseTemplate=$value;

+	}

+}

+

+?>
\ No newline at end of file