* {@link CClipWidget Clips} : a clip is a piece of captured output that can be inserted elsewhere.
* {@link CWidget Widgets} : a widget is a self-contained sub-controller with its own view and model.
* {@link COutputCache Fragment cache} : fragment cache selectively caches a portion of the output.
*
*
* To use a widget in a view, use the following in the view:
*
* $this->widget('path.to.widgetClass',array('property1'=>'value1',...));
*
* or
*
* $this->beginWidget('path.to.widgetClass',array('property1'=>'value1',...));
* // ... display other contents here
* $this->endWidget();
*
*
* To create a clip, use the following:
*
* $this->beginClip('clipID');
* // ... display the clip contents
* $this->endClip();
*
* Then, in a different view or place, the captured clip can be inserted as:
*
* echo $this->clips['clipID'];
*
*
* Note that $this in the code above refers to current controller so, for example,
* if you need to access clip from a widget where $this refers to widget itself
* you need to do it the following way:
*
*
* echo $this->getController()->clips['clipID'];
*
*
* To use fragment cache, do as follows,
*
* if($this->beginCache('cacheID',array('property1'=>'value1',...))
* {
* // ... display the content to be cached here
* $this->endCache();
* }
*
*
* @author Qiang Xue
* @since 2.0
*/
abstract class Controller extends Component implements Initable
{
/**
* @var string ID of this controller
*/
public $id;
/**
* @var Module $module the module that this controller belongs to.
*/
public $module;
/**
* @var string the name of the default action. Defaults to 'index'.
*/
public $defaultAction = 'index';
/**
* @var Action the action that is currently being executed
*/
public $action;
/**
* @param string $id ID of this controller
* @param Module $module the module that this controller belongs to.
*/
public function __construct($id, $module)
{
$this->id = $id;
$this->module = $module;
}
/**
* Initializes the controller.
* This method is called by the application before the controller starts to execute.
* You may override this method to perform the needed initialization for the controller.
*/
public function init()
{
}
/**
* Returns a list of external action classes.
* Array keys are action IDs, and array values are the corresponding
* action class names or action configuration arrays. For example,
*
* ~~~
* return array(
* 'action1'=>'@application/components/Action1',
* 'action2'=>array(
* 'class'=>'@application/components/Action2',
* 'property1'=>'value1',
* 'property2'=>'value2',
* ),
* );
* ~~~
*
* [[\Yii::createObject()]] will be invoked to create the requested action
* using the configuration provided here.
*
* Derived classes may override this method to declare external actions.
*
* Note, in order to inherit actions defined in the parent class, a child class needs to
* merge the parent actions with child actions using functions like `array_merge()`.
*
* @return array list of external action classes
* @see createAction
*/
public function actions()
{
return array();
}
/**
* Creates an action with the specified ID and runs it.
* If the action does not exist, [[missingAction()]] will be invoked.
* @param string $actionID action ID
* @return integer the exit status of the action. 0 means normal, other values mean abnormal.
* @see createAction
* @see runAction
* @see missingAction
*/
public function run($actionID)
{
if (($action = $this->createAction($actionID)) !== null) {
return $this->runAction($action);
} else {
$this->missingAction($actionID);
return 1;
}
}
/**
* Runs the action.
* @param Action $action action to run
* @return integer the exit status of the action. 0 means normal, other values mean abnormal.
*/
public function runAction($action)
{
$priorAction = $this->action;
$this->action = $action;
$exitStatus = 1;
if ($this->authorize($action)) {
$params = $action->normalizeParams($this->getActionParams());
if ($params !== false) {
if ($this->beforeAction($action)) {
$exitStatus = (int)call_user_func_array(array($action, 'run'), $params);
$this->afterAction($action);
}
} else {
$this->invalidActionParams($action);
}
}
$this->action = $priorAction;
return $exitStatus;
}
/**
* Returns the request parameters that will be used for action parameter binding.
* Default implementation simply returns an empty array.
* Child classes may override this method to customize the parameters to be provided
* for action parameter binding (e.g. `$_GET`).
* @return array the request parameters (name-value pairs) to be used for action parameter binding
*/
public function getActionParams()
{
return array();
}
/**
* Creates the action instance based on the action ID.
* The action can be either an inline action or an object.
* The latter is created by looking up the action map specified in [[actions]].
* @param string $actionID ID of the action. If empty, it will take the value of [[defaultAction]].
* @return Action the action instance, null if the action does not exist.
* @see actions
*/
public function createAction($actionID)
{
if ($actionID === '') {
$actionID = $this->defaultAction;
}
if (method_exists($this, 'action' . $actionID) && strcasecmp($actionID, 's')) {
return new InlineAction($actionID, $this);
} else {
$actions = $this->actions();
if (isset($actions[$actionID])) {
return \Yii::createObject($actions[$actionID], $actionID, $this);
}
}
return null;
}
/**
* This method is invoked when the request parameters do not satisfy the requirement of the specified action.
* The default implementation will throw an exception.
* @param Action $action the action being executed
* @throws Exception whenever this method is invoked
*/
public function invalidActionParams($action)
{
throw new Exception(\Yii::t('yii', 'Your request is invalid.'));
}
/**
* Handles the request whose action is not recognized.
* This method is invoked when the controller cannot find the requested action.
* The default implementation simply throws an exception.
* @param string $actionID the missing action name
* @throws Exception whenever this method is invoked
*/
public function missingAction($actionID)
{
throw new Exception(\Yii::t('yii', 'The system is unable to find the requested action "{action}".',
array('{action}' => $actionID == '' ? $this->defaultAction : $actionID)));
}
/**
* @return string the controller ID that is prefixed with the module ID (if any).
*/
public function getUniqueId()
{
return $this->module instanceof Application ? $this->id : $this->module->getUniqueId() . '/' . $this->id;
}
/**
* Returns the route of the current request.
* @return string the route (module ID, controller ID and action ID) of the current request.
*/
public function getRoute()
{
return $this->action !== null ? $this->getUniqueId() . '/' . $this->action->id : $this->getUniqueId();
}
/**
* Processes the request using another controller action.
* This is like {@link redirect}, but the user browser's URL remains unchanged.
* In most cases, you should call {@link redirect} instead of this method.
* @param string $route the route of the new controller action. This can be an action ID, or a complete route
* with module ID (optional in the current module), controller ID and action ID. If the former, the action is assumed
* to be located within the current controller.
* @param boolean $exit whether to end the application after this call. Defaults to true.
*/
public function forward($route, $exit = true)
{
if (strpos($route, '/') === false) {
$status = $this->run($route);
} else {
if ($route[0] !== '/' && !$this->module instanceof Application) {
$route = '/' . $this->module->getUniqueId() . '/' . $route;
}
$status = \Yii::$application->runController($route);
}
if ($exit) {
\Yii::$application->end($status);
}
}
/**
* This method is invoked when checking the access for the action to be executed.
* @param Action $action the action to be executed.
* @return boolean whether the action is allowed to be executed.
*/
public function authorize(Action $action)
{
$event = new ActionEvent($action);
$this->trigger(__METHOD__, $event);
return $event->isValid;
}
/**
* This method is invoked right before an action is to be executed (after all possible filters.)
* You may override this method to do last-minute preparation for the action.
* @param Action $action the action to be executed.
* @return boolean whether the action should continue to be executed.
*/
public function beforeAction(Action $action)
{
$event = new ActionEvent($action);
$this->trigger(__METHOD__, $event);
return $event->isValid;
}
/**
* This method is invoked right after an action is executed.
* You may override this method to do some postprocessing for the action.
* @param Action $action the action just executed.
*/
public function afterAction(Action $action)
{
$event = new ActionEvent($action);
$this->trigger(__METHOD__, $event);
}
/**
* This method is invoked right before an action renders its result using [[render()]].
* @param Action $action the action to be executed.
* @return boolean whether the action should continue to render.
*/
public function beforeRender(Action $action)
{
$event = new ActionEvent($action);
$this->trigger(__METHOD__, $event);
return $event->isValid;
}
/**
* This method is invoked right after an action renders its result using [[render()]].
* @param Action $action the action just executed.
*/
public function afterRender(Action $action)
{
$event = new ActionEvent($action);
$this->trigger(__METHOD__, $event);
}
}