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-rw-r--r--framework/Web/UI/ActiveControls/TActiveControl.php125
-rw-r--r--framework/Web/UI/ActiveControls/TActivePageAdapter.php33
-rw-r--r--framework/Web/UI/ActiveControls/TCallback.php165
-rw-r--r--framework/Web/UI/ActiveControls/TCallbackClientScript.php109
-rw-r--r--framework/Web/UI/ActiveControls/TCallbackClientSideOptions.php68
-rw-r--r--framework/Web/UI/ActiveControls/TCallbackResponse.php45
6 files changed, 465 insertions, 80 deletions
diff --git a/framework/Web/UI/ActiveControls/TActiveControl.php b/framework/Web/UI/ActiveControls/TActiveControl.php
index e61682d3..62470a18 100644
--- a/framework/Web/UI/ActiveControls/TActiveControl.php
+++ b/framework/Web/UI/ActiveControls/TActiveControl.php
@@ -6,14 +6,65 @@
class TActiveControl extends TControl implements ICallbackEventHandler, IActiveControl
{
+ /**
+ * @var TCallbackClientSideOptions client-side options.
+ */
private $_clientSide;
+ /**
+ * 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, call this constructor.
+ */
public function __construct()
{
parent::__construct();
$this->setAdapter(new TActiveControlAdapter($this));
}
+ /**
+ * @return boolean whether callback event trigger by this button will cause
+ * input validation, default is true
+ */
+ public function getCausesValidation()
+ {
+ return $this->getViewState('CausesValidation',true);
+ }
+
+ /**
+ * @param boolean whether callback event trigger by this button will cause
+ * input validation
+ */
+ public function setCausesValidation($value)
+ {
+ $this->setViewState('CausesValidation',TPropertyValue::ensureBoolean($value),true);
+ }
+
+ /**
+ * @return string the group of validators which the button causes validation
+ * upon callback
+ */
+ public function getValidationGroup()
+ {
+ return $this->getViewState('ValidationGroup','');
+ }
+
+ /**
+ * @param string the group of validators which the button causes validation
+ * upon callback
+ */
+ public function setValidationGroup($value)
+ {
+ $this->setViewState('ValidationGroup',$value,'');
+ }
+
+ /**
+ * Callback client-side options can be set by setting the properties of
+ * the ClientSide property. E.g. <com:TCallback ClientSide.OnSuccess="..." />
+ * See {@link TCallbackClientSideOptions} for details on the properties of
+ * ClientSide.
+ * @return TCallbackClientSideOptions client-side callback options.
+ */
public function getClientSide()
{
if(is_null($this->_clientSide))
@@ -21,28 +72,78 @@ class TActiveControl extends TControl implements ICallbackEventHandler, IActiveC
return $this->_clientSide;
}
+ /**
+ * @return TCallbackClientSideOptions callback client-side options.
+ */
protected function createClientSideOptions()
{
- $client = new TCallbackClientSideOptions;
- return $client;
+ return new TCallbackClientSideOptions;
}
+
+ /**
+ * @return boolean whether to perform validation if the callback is
+ * requested.
+ */
+ protected function canCauseValidation()
+ {
+ if($this->getCausesValidation())
+ {
+ $group=$this->getValidationGroup();
+ return $this->getPage()->getValidators($group)->getCount()>0;
+ }
+ else
+ return false;
+ }
+ /**
+ * Raises the callback event. This method is required by {@link
+ * ICallbackEventHandler} interface. If {@link getCausesValidation
+ * CausesValidation} is true, it will invoke the page's {@link TPage::
+ * validate validate} method first. It will raise {@link onCallback
+ * OnCallback} event. This method is mainly used by framework and control
+ * developers.
+ * @param TCallbackEventParameter the event parameter
+ */
public function raiseCallbackEvent($param)
{
- var_dump($param->getParameter());
- $param->Output->write($param->Parameter);
- $client = $this->getPage()->getCallbackClient();
- $client->hide($this);
- $client->toggle($this);
- $client->update($this, 1);
- $param->setData(array("asdasdad",1));
+ if($this->getCausesValidation())
+ $this->getPage()->validate($this->getValidationGroup());
+ $this->onCallback($param);
+ }
+
+ /**
+ * 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);
}
+ /**
+ * @return array list of callback javascript options.
+ */
+ protected function getCallbackOptions()
+ {
+ $validate = $this->getCausesValidation();
+ $options['CausesValidation']= $validate ? '' : false;
+ $options['ValidationGroup']=$this->getValidationGroup();
+ return $options;
+ }
+
+ /**
+ * Returns the javascript statement to invoke a callback request for this
+ * control. Additional options for callback can be set via subproperties of
+ * {@link getClientSide ClientSide} property. E.g. ClientSide.OnSuccess="..."
+ * @return string javascript statement to invoke a callback.
+ */
public function getCallbackReference()
{
- // $formID = $this->getPage()->getForm()->getClientID();
- // $this->getClientSide()->setValidationForm($formID);
- return $this->getPage()->getClientScript()->getCallbackReference($this);
+ $client = $this->getPage()->getClientScript();
+ return $client->getCallbackReference($this, $this->getCallbackOptions());
}
}
diff --git a/framework/Web/UI/ActiveControls/TActivePageAdapter.php b/framework/Web/UI/ActiveControls/TActivePageAdapter.php
index 2607fec2..4cb785dd 100644
--- a/framework/Web/UI/ActiveControls/TActivePageAdapter.php
+++ b/framework/Web/UI/ActiveControls/TActivePageAdapter.php
@@ -50,7 +50,7 @@ class TActivePageAdapter extends TControlAdapter
public function __construct(TPage $control)
{
parent::__construct($control);
- //$this->getApplication()->setResponse($this->getCallbackResponseHandler());
+ $this->getApplication()->setResponse($this->createCallbackResponseHandler());
$this->trapCallbackErrorsExceptions();
}
@@ -75,6 +75,7 @@ class TActivePageAdapter extends TControlAdapter
{
Prado::trace("ActivePage renderCallbackResponse()",'System.Web.UI.ActiveControls.TActivePageAdapter');
$this->renderResponse($writer);
+ //$this->getResponse()->flush();
}
/**
@@ -87,9 +88,11 @@ class TActivePageAdapter extends TControlAdapter
$executeJavascript = $this->getCallbackClientHandler()->getClientFunctionsToExecute()->toArray();
$actions = TJavascript::jsonEncode($executeJavascript);
$response->appendHeader(self::CALLBACK_ACTION_HEADER.': '.$actions);
- $data = TJavascript::jsonEncode($this->_result->getData());
- $response->appendHeader(self::CALLBACK_DATA_HEADER.': '.$data);
- $response->flush();
+ if($this->_result)
+ {
+ $data = TJavascript::jsonEncode($this->_result->getData());
+ $response->appendHeader(self::CALLBACK_DATA_HEADER.': '.$data);
+ }
}
/**
@@ -104,12 +107,14 @@ class TActivePageAdapter extends TControlAdapter
{
if($callbackHandler instanceof ICallbackEventHandler)
{
- $writer = $this->getResponse()->createHtmlWriter();
- $this->_result = new TCallbackEventParameter($writer, $this->getCallbackEventParameter());
+ $param = $this->getCallbackEventParameter();
+ $this->_result = new TCallbackEventParameter($this->getResponse(), $param);
$callbackHandler->raiseCallbackEvent($this->_result);
}
else
+ {
throw new TInvalidCallbackHandlerException($callbackHandler->getUniqueID());
+ }
}
else
{
@@ -193,6 +198,11 @@ class TActivePageAdapter extends TControlAdapter
$this->_callbackClient = $handler;
}
+ protected function createCallbackResponseHandler()
+ {
+ return new TCallbackResponse();
+ }
+
}
/**
@@ -213,9 +223,9 @@ class TActivePageAdapter extends TControlAdapter
class TCallbackEventParameter extends TEventParameter
{
/**
- * @var THtmlWriter output content.
+ * @var TCallbackResponse output content.
*/
- private $_output;
+ private $_response;
/**
* @var mixed callback request parameter.
*/
@@ -228,9 +238,9 @@ class TCallbackEventParameter extends TEventParameter
/**
* Creates a new TCallbackEventParameter.
*/
- public function __construct($writer, $parameter)
+ public function __construct($response, $parameter)
{
- $this->_output = $writer;
+ $this->_response = $response;
$this->_parameter = $parameter;
}
@@ -239,7 +249,7 @@ class TCallbackEventParameter extends TEventParameter
*/
public function getOutput()
{
- return $this->_output;
+ return $this->_response->createHtmlWriter();
}
/**
@@ -283,6 +293,7 @@ class TCallbackErrorHandler extends TErrorHandler
error_log("Error happened while processing an existing error:\n".$exception->__toString());
header('HTTP/1.0 500 Internal Error');
}
+ $this->getApplication()->getResponse()->flush();
}
private function getExceptionData($exception)
diff --git a/framework/Web/UI/ActiveControls/TCallback.php b/framework/Web/UI/ActiveControls/TCallback.php
new file mode 100644
index 00000000..d3b1f54d
--- /dev/null
+++ b/framework/Web/UI/ActiveControls/TCallback.php
@@ -0,0 +1,165 @@
+<?php
+
+/*
+ * Created on 25/04/2006
+ */
+
+class TCallback extends TWebControl implements ICallbackEventHandler
+{
+ /**
+ * @var TCallbackClientSideOptions client-side options.
+ */
+ private $_clientSide;
+
+ /**
+ * 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, call this constructor.
+ */
+ public function __construct()
+ {
+ parent::__construct();
+ $this->setAdapter(new TActiveControlAdapter($this));
+ }
+
+ /**
+ * @return string tag name of the panel
+ */
+ protected function getTagName()
+ {
+ return 'div';
+ }
+
+ /**
+ * @return boolean whether callback event trigger by this button will cause
+ * input validation, default is true
+ */
+ public function getCausesValidation()
+ {
+ return $this->getViewState('CausesValidation',true);
+ }
+
+ /**
+ * @param boolean whether callback event trigger by this button will cause
+ * input validation
+ */
+ public function setCausesValidation($value)
+ {
+ $this->setViewState('CausesValidation',TPropertyValue::ensureBoolean($value),true);
+ }
+
+ /**
+ * @return string the group of validators which the button causes validation
+ * upon callback
+ */
+ public function getValidationGroup()
+ {
+ return $this->getViewState('ValidationGroup','');
+ }
+
+ /**
+ * @param string the group of validators which the button causes validation
+ * upon callback
+ */
+ public function setValidationGroup($value)
+ {
+ $this->setViewState('ValidationGroup',$value,'');
+ }
+
+ /**
+ * Callback client-side options can be set by setting the properties of
+ * the ClientSide property. E.g. <com:TCallback ClientSide.OnSuccess="..." />
+ * See {@link TCallbackClientSideOptions} for details on the properties of
+ * ClientSide.
+ * @return TCallbackClientSideOptions client-side callback options.
+ */
+ public function getClientSide()
+ {
+ if(is_null($this->_clientSide))
+ $this->_clientSide = $this->createClientSideOptions();
+ return $this->_clientSide;
+ }
+
+ /**
+ * @return TCallbackClientSideOptions callback client-side options.
+ */
+ protected function createClientSideOptions()
+ {
+ return new TCallbackClientSideOptions;
+ }
+
+ /**
+ * @return boolean whether to perform validation if the callback is
+ * requested.
+ */
+ protected function canCauseValidation()
+ {
+ if($this->getCausesValidation())
+ {
+ $group=$this->getValidationGroup();
+ return $this->getPage()->getValidators($group)->getCount()>0;
+ }
+ else
+ return false;
+ }
+
+ /**
+ * Raises the callback event. This method is required by {@link
+ * ICallbackEventHandler} interface. If {@link getCausesValidation
+ * CausesValidation} is true, it will invoke the page's {@link TPage::
+ * validate validate} method first. It will raise {@link onCallback
+ * OnCallback} event. This method is mainly used by framework and control
+ * developers.
+ * @param TCallbackEventParameter the event parameter
+ */
+ public function raiseCallbackEvent($param)
+ {
+ if($this->getCausesValidation())
+ $this->getPage()->validate($this->getValidationGroup());
+ $this->onCallback($param);
+ }
+
+ /**
+ * 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);
+ }
+
+ /**
+ * @return array list of callback javascript options.
+ */
+ protected function getCallbackOptions()
+ {
+ $validate = $this->getCausesValidation();
+ $options['CausesValidation']= $validate ? '' : false;
+ $options['ValidationGroup']=$this->getValidationGroup();
+ return $options;
+ }
+
+ /**
+ * Returns the javascript statement to invoke a callback request for this
+ * control. Additional options for callback can be set via subproperties of
+ * {@link getClientSide ClientSide} property. E.g. ClientSide.OnSuccess="..."
+ * @return string javascript statement to invoke a callback.
+ */
+ public function getCallbackReference()
+ {
+ $client = $this->getPage()->getClientScript();
+ return $client->getCallbackReference($this, $this->getCallbackOptions());
+ }
+
+ public function render($writer)
+ {
+ parent::render($writer);
+ if($this->getPage()->getIsCallback())
+ $this->getPage()->getCallbackClient()->replace($this, $writer);
+ }
+}
+
+?>
diff --git a/framework/Web/UI/ActiveControls/TCallbackClientScript.php b/framework/Web/UI/ActiveControls/TCallbackClientScript.php
index 10c0e638..aaf81380 100644
--- a/framework/Web/UI/ActiveControls/TCallbackClientScript.php
+++ b/framework/Web/UI/ActiveControls/TCallbackClientScript.php
@@ -32,7 +32,7 @@
* @package System.Web.UI.ActiveControls
* @since 3.0
*/
-class TCallbackClientScript
+class TCallbackClientScript extends TApplicationComponent
{
/**
* @var TList list of client functions to execute.
@@ -69,7 +69,7 @@ class TCallbackClientScript
if(count($params) > 0)
{
if($params[0] instanceof TControl)
- $params[0] = $params[0]->getID();
+ $params[0] = $params[0]->getClientID();
}
$this->_actions->add(array($function => $params));
}
@@ -188,22 +188,20 @@ class TCallbackClientScript
* @param TControl|string new HTML content, if content is of a TControl, the
* controls render method is called.
*/
- public function update($element, $innerHTML)
+ public function update($element, $content)
{
- if($innerHTML instanceof TControl)
- $innerHTML = $innerHTML->render();
- $this->callClientFunction('Element.update', array($element, $innerHTML));
+ $this->replace($element, $content, 'Element.update');
}
/**
* Replace the innerHTML of a content with fragements of the response body.
* @param TControl|string control element or element id
*/
- public function replaceContent($element)
+/* public function replaceContent($element)
{
$this->callClientFunction('Prado.Element.replaceContent', $element);
}
-
+*/
/**
* Add a Css class name to the element.
* @param TControl|string control element or element id
@@ -229,10 +227,10 @@ class TCallbackClientScript
* @param TControl|string control element or element id
* @param string new CssClass name for the element.
*/
- public function setCssClass($element, $cssClass)
+ /*public function setCssClass($element, $cssClass)
{
$this->callClientFunction('Prado.Element.CssClass.set', array($element, $cssClass));
- }
+ }*/
/**
* Scroll the top of the browser viewing area to the location of the
@@ -261,11 +259,9 @@ class TCallbackClientScript
* @param TControl|string HTML fragement, otherwise if TControl, its render
* method will be called.
*/
- public function insertAfter($element, $innerHTML)
+ public function insertAfter($element, $content)
{
- if($innerHTML instanceof TControl)
- $innerHTML = $innerHTML->render();
- $this->callClientFunction('Prado.Element.Insert.After', array($element, $innerHTML));
+ $this->replace($element, $content, 'Element.Insert.After');
}
/**
@@ -274,11 +270,9 @@ class TCallbackClientScript
* @param TControl|string HTML fragement, otherwise if TControl, its render
* method will be called.
*/
- public function insertBefore($element, $innerHTML)
+ public function insertBefore($element, $content)
{
- if($innerHTML instanceof TControl)
- $innerHTML = $innerHTML->render();
- $this->callClientFunction('Prado.Element.Insert.Before', array($element, $innerHTML));
+ $this->replace($element, $content, 'Element.Insert.Before');
}
/**
@@ -287,11 +281,9 @@ class TCallbackClientScript
* @param TControl|string HTML fragement, otherwise if TControl, its render
* method will be called.
*/
- public function insertBelow($element, $innerHTML)
+ public function insertBelow($element, $content)
{
- if($innerHTML instanceof TControl)
- $innerHTML = $innerHTML->render();
- $this->callClientFunction('Prado.Element.Insert.Below', array($element, $innerHTML));
+ $this->replace($element, $content, 'Element.Insert.Below');
}
/**
@@ -300,12 +292,75 @@ class TCallbackClientScript
* @param TControl|string HTML fragement, otherwise if TControl, its render
* method will be called.
*/
- public function insertAbove($element, $innerHTML)
+ public function insertAbove($element, $content)
{
- if($innerHTML instanceof TControl)
- $innerHTML = $innerHTML->render();
- $this->callClientFunction('Prado.Element.Insert.Above', array($element, $innerHTML));
- }
+ $this->replace($element, $content, 'Element.Insert.Above');
+ }
+
+ /**
+ * Replace the content of an element with new content. The new content can
+ * be a string or a TControl component. If the <tt>content</tt> parameter is
+ * a TControl component, its rendered method will be called and its contents
+ * will be used for replacement.
+ * @param TControl|string control element or HTML element id.
+ * @param TControl|string HTML fragement, otherwise it will TControl's
+ * rendered content.
+ * @param string replacement method, default is to replace the outter
+ * html content.
+ * @param string provide a custom boundary.
+ * @see insertAbout
+ * @see insertBelow
+ * @see insertBefore
+ * @see insertAfter
+ */
+ public function replace($element, $content, $method="Element.replace", $boundary=null)
+ {
+ if($content instanceof TControl)
+ {
+ $boundary = $this->getRenderedContentBoundary($content);
+ $this->callClientFunction('Prado.Element.replaceContent',
+ array($element, $method, null, $boundary));
+ }
+ else if($content instanceof THtmlWriter)
+ {
+ $boundary = $this->getResponseContentBoundary($content);
+ $this->callClientFunction('Prado.Element.replaceContent',
+ array($element, $method, null, $boundary));
+ }
+ else
+ {
+ $this->callClientFunction('Prado.Element.replaceContent',
+ array($element, $method, $content, $boundary));
+ }
+ }
+
+ /**
+ * Renders the control and return the content boundary from
+ * TCallbackResponseWriter. This method should only be used by framework
+ * component developers.
+ * @param TControl control to be rendered on callback response.
+ * @return string the boundary for which the rendered content is wrapped.
+ */
+ private function getRenderedContentBoundary($control)
+ {
+ $writer = $this->getResponse()->createHtmlWriter();
+ $control->render($writer);
+ return $writer->getWriter()->getBoundary();
+ }
+
+ /**
+ * @param THtmlWriter the writer responsible for rendering html content.
+ * @return string content boundary.
+ */
+ private function getResponseContentBoundary($html)
+ {
+ if($html instanceof THtmlWriter)
+ {
+ if($html->getWriter() instanceof TCallbackResponseWriter)
+ return $html->getWriter()->getBoundary();
+ }
+ return null;
+ }
/**
* Add a visual effect the element.
diff --git a/framework/Web/UI/ActiveControls/TCallbackClientSideOptions.php b/framework/Web/UI/ActiveControls/TCallbackClientSideOptions.php
index dea1b4e1..1e1bd52f 100644
--- a/framework/Web/UI/ActiveControls/TCallbackClientSideOptions.php
+++ b/framework/Web/UI/ActiveControls/TCallbackClientSideOptions.php
@@ -34,27 +34,35 @@ class TClientSideOptions extends TComponent
}
/**
+ * TCallbackClientSideOptions class.
+ *
* The following client side events are executing in order if the callback
* request and response are send and received successfuly.
*
- * - <b>onUninitialized</b> executed when AJAX request is uninitialized.
- * - <b>onLoading</b> executed when AJAX request is initiated
- * - <b>onLoaded</b> executed when AJAX request begins.
- * - <b>onInteractive</b> executed when AJAX request is in progress.
- * - <b>onComplete</b>executed when AJAX response returns.
+ * - <b>onUninitialized</b> executed when callback request is uninitialized.
+ * - <b>onLoading</b> executed when callback request is initiated
+ * - <b>onLoaded</b> executed when callback request begins.
+ * - <b>onInteractive</b> executed when callback request is in progress.
+ * - <b>onComplete</b>executed when callback response returns.
*
* The <tt>OnSuccess</tt> and <tt>OnFailure</tt> events are raised when the
* response is returned. A successful request/response will raise
* <tt>OnSuccess</tt> event otherwise <tt>OnFailure</tt> will be raised.
*
- * - <b>onSuccess</b> executed when AJAX request returns and is successful.
- * - <b>onFailure</b> executed when AJAX request returns and fails.
+ * - <b>onSuccess</b> executed when callback request returns and is successful.
+ * - <b>onFailure</b> executed when callback request returns and fails.
+ * - <b>onException</b> raised when callback request fails due to
+ * request/response errors.
*
- * - <b>CausesValidation</b> true to perform before callback request.
- * - <b>ValidationGroup</b> validation grouping name.
*/
class TCallbackClientSideOptions extends TClientSideOptions
{
+ /**
+ * Returns javascript statement enclosed within a javascript function.
+ * @param string javascript statement, if string begins within
+ * "javascript:" the whole string is assumed to be a function.
+ * @return string javascript statement wrapped in a javascript function
+ */
protected function ensureFunction($javascript)
{
if(TJavascript::isFunction($javascript))
@@ -175,34 +183,38 @@ class TCallbackClientSideOptions extends TClientSideOptions
$this->setFunction('onFailure', $javascript);
}
- public function getCausesValidation()
- {
- return $this->getOption('CausesValidation');
- }
-
- public function setCausesValidation($value)
- {
- $this->getOptions()->add('CausesValidation', TPropertyValue::ensureBoolean($value));
- }
-
- public function getValidationGroup()
+ /**
+ * @return string javascript code for client-side onException event
+ */
+ public function getOnException()
{
- return $this->getOption('ValidationGroup');
+ return $this->getOption('onException');
}
- public function setValidationGroup($value)
+ /**
+ * @param string javascript code for client-side onException event.
+ */
+ public function setOnException($javascript)
{
- $this->getOptions()->add('ValidationGroup', $value);
- }
+ $this->setFunction('onException', $javascript);
+ }
- public function getValidationForm()
+ /**
+ * @return boolean true to post the state on callback, default is post the
+ * state on callback.
+ */
+ public function getPostState()
{
- return $this->getOption('Form');
+ return $this->getOption('PostState');
}
- public function setValidationForm($value)
+ /**
+ * @param boolean true to post the state of the form with callback requests.
+ * Default is to post the state.
+ */
+ public function setPostState($value)
{
- $this->getOptions()->add('Form', $value);
+ $this->getOptions()->add('PostState', TPropertyValue::ensureBoolean($value));
}
}
diff --git a/framework/Web/UI/ActiveControls/TCallbackResponse.php b/framework/Web/UI/ActiveControls/TCallbackResponse.php
index a05c20c7..4a893b9a 100644
--- a/framework/Web/UI/ActiveControls/TCallbackResponse.php
+++ b/framework/Web/UI/ActiveControls/TCallbackResponse.php
@@ -11,9 +11,50 @@
class TCallbackResponse extends THttpResponse
{
+ private $_writers=array();
+ public function createHtmlWriter($type=null)
+ {
+ $writer = new TCallbackResponseWriter();
+ $this->_writers[] = $writer;
+ if($type===null)
+ $type=$this->getHtmlWriterType();
+ return Prado::createComponent($type,$writer);
+ }
+
+ public function flush()
+ {
+ foreach($this->_writers as $writer)
+ echo $writer->flush();
+ parent::flush();
+ }
}
-
-
+class TCallbackResponseWriter extends TTextWriter
+{
+ private $_boundary;
+
+ public function __construct()
+ {
+ $this->_boundary = sprintf('%x',crc32((string)$this));
+ }
+
+ public function getBoundary()
+ {
+ return $this->_boundary;
+ }
+
+ public function setBoundary($value)
+ {
+ $this->_boundary = $value;
+ }
+
+ public function flush()
+ {
+ $content = '<!--'.$this->getBoundary().'-->';
+ $content .= parent::flush();
+ $content .= '<!--//'.$this->getBoundary().'-->';
+ return $content;
+ }
+}
?>