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<?php
/**
* TDropDownList class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link https://github.com/pradosoft/prado
* @copyright Copyright © 2005-2016 The PRADO Group
* @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
* @package System.Web.UI.WebControls
*/
/**
* Includes TListControl class
*/
Prado::using('System.Web.UI.WebControls.TListControl');
/**
* TDropDownList class
*
* TDropDownList displays a dropdown list on a Web page.
* It inherits all properties and events from {@link TListControl}.
*
* Since v3.0.3, TDropDownList starts to support optgroup. To specify an option group for
* a list item, set a Group attribute with it,
* <code>
* $listitem->Attributes->Group="Group Name";
* // or <com:TListItem Attributes.Group="Group Name" .../> in template
* </code>
*
* Since v3.1.1, TDropDownList starts to support prompt text. That is, a prompt item can be
* displayed as the first list item by specifying either {@link setPromptText PromptText} or
* {@link setPromptValue PromptValue}, or both. Choosing the prompt item will unselect the TDropDownList.
*
* When a prompt item is set, its index in the list is set to -1. So, the {@link getSelectedIndex SelectedIndex}
* property is not affected by a prompt item: the items list will still be zero-based.
*
* The {@link clearSelection clearSelection} method will select the prompt item if existing, otherway the first
* available item in the dropdown list will be selected.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package System.Web.UI.WebControls
* @since 3.0
*/
class TDropDownList extends TListControl implements IPostBackDataHandler, IValidatable
{
private $_dataChanged=false;
private $_isValid=true;
/**
* Adds attributes to renderer.
* @param THtmlWriter the renderer
*/
protected function addAttributesToRender($writer)
{
$writer->addAttribute('name',$this->getUniqueID());
parent::addAttributesToRender($writer);
}
/**
* Gets the name of the javascript class responsible for performing postback for this control.
* This method overrides the parent implementation.
* @return string the javascript class name
*/
protected function getClientClassName()
{
return 'Prado.WebUI.TDropDownList';
}
/**
* Loads user input data.
* This method is primarly used by framework developers.
* @param string the key that can be used to retrieve data from the input data collection
* @param array the input data collection
* @return boolean whether the data of the component has been changed
*/
public function loadPostData($key,$values)
{
if(!$this->getEnabled(true))
return false;
$this->ensureDataBound();
$selection=isset($values[$key])?$values[$key]:null;
if($selection!==null)
{
$index=$this->getItems()->findIndexByValue($selection,false);
if($this->getSelectedIndex()!==$index)
{
$this->setSelectedIndex($index);
return $this->_dataChanged=true;
}
}
return false;
}
/**
* Raises postdata changed event.
* This method is required by {@link IPostBackDataHandler} interface.
* It is invoked by the framework when {@link getSelectedIndex SelectedIndex} property
* is changed on postback.
* This method is primarly used by framework developers.
*/
public function raisePostDataChangedEvent()
{
if($this->getAutoPostBack() && $this->getCausesValidation())
$this->getPage()->validate($this->getValidationGroup());
$this->onSelectedIndexChanged(null);
}
/**
* Returns a value indicating whether postback has caused the control data change.
* This method is required by the IPostBackDataHandler interface.
* @return boolean whether postback has caused the control data change. False if the page is not in postback mode.
*/
public function getDataChanged()
{
return $this->_dataChanged;
}
/**
* @throws TNotSupportedException if this method is invoked
*/
public function setSelectedIndices($indices)
{
throw new TNotSupportedException('dropdownlist_selectedindices_unsupported');
}
/**
* Returns the value to be validated.
* This methid is required by IValidatable interface.
* @return mixed the value of the property to be validated.
*/
public function getValidationPropertyValue()
{
return $this->getSelectedValue();
}
/**
* Returns true if this control validated successfully.
* Defaults to true.
* @return bool wether this control validated successfully.
*/
public function getIsValid()
{
return $this->_isValid;
}
/**
* @param bool wether this control is valid.
*/
public function setIsValid($value)
{
$this->_isValid=TPropertyValue::ensureBoolean($value);
}
}
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