refactored MVC.

framework/base/Controller.php

@@ -47,6 +47,11 @@ class Controller extends Component
 	 * by [[run()]] when it is called by [[Application]] to run an action.
 	 */
 	public $action;
+	/**
+	 * @var View the view object that can be used to render views or view files.
+	 */
+	private $_view;
+
 
 	/**
 	 * @param string $id the ID of this controller
@@ -135,7 +140,7 @@ class Controller extends Component
 		} elseif ($pos > 0) {
 			return $this->module->runAction($route, $params);
 		} else {
-			return \Yii::$app->runAction(ltrim($route, '/'), $params);
+			return Yii::$app->runAction(ltrim($route, '/'), $params);
 		}
 	}
 
@@ -293,6 +298,37 @@ class Controller extends Component
 
 	/**
 	 * Renders a view and applies layout if available.
+	 *
+	 * The view to be rendered can be specified in one of the following formats:
+	 *
+	 * - path alias (e.g. "@app/views/site/index");
+	 * - absolute path within application (e.g. "//site/index"): the view name starts with double slashes.
+	 *   The actual view file will be looked for under the [[Application::viewPath|view path]] of the application.
+	 * - absolute path within module (e.g. "/site/index"): the view name starts with a single slash.
+	 *   The actual view file will be looked for under the [[Module::viewPath|view path]] of [[module]].
+	 * - relative path (e.g. "index"): the actual view file will be looked for under [[viewPath]].
+	 *
+	 * To determine which layout should be applied, the following two steps are conducted:
+	 *
+	 * 1. In the first step, it determines the layout name and the context module:
+	 *
+	 * - If [[layout]] is specified as a string, use it as the layout name and [[module]] as the context module;
+	 * - If [[layout]] is null, search through all ancestor modules of this controller and find the first
+	 *   module whose [[Module::layout|layout]] is not null. The layout and the corresponding module
+	 *   are used as the layout name and the context module, respectively. If such a module is not found
+	 *   or the corresponding layout is not a string, it will return false, meaning no applicable layout.
+	 *
+	 * 2. In the second step, it determines the actual layout file according to the previously found layout name
+	 *    and context module. The layout name can be
+	 *
+	 * - a path alias (e.g. "@app/views/layouts/main");
+	 * - an absolute path (e.g. "/main"): the layout name starts with a slash. The actual layout file will be
+	 *   looked for under the [[Application::layoutPath|layout path]] of the application;
+	 * - a relative path (e.g. "main"): the actual layout layout file will be looked for under the
+	 *   [[Module::viewPath|view path]] of the context module.
+	 *
+	 * If the layout name does not contain a file extension, it will use the default one `.php`.
+	 *
 	 * @param string $view the view name. Please refer to [[findViewFile()]] on how to specify a view name.
 	 * @param array $params the parameters (name-value pairs) that should be made available in the view.
 	 * These parameters will not be available in the layout.
@@ -301,10 +337,11 @@ class Controller extends Component
 	 */
 	public function render($view, $params = array())
 	{
-		$output = Yii::$app->getView()->render($view, $params, $this);
+		$viewFile = $this->findViewFile($view);
+		$output = $this->getView()->renderFile($viewFile, $params, $this);
 		$layoutFile = $this->findLayoutFile();
 		if ($layoutFile !== false) {
-			return Yii::$app->getView()->renderFile($layoutFile, array('content' => $output), $this);
+			return $this->getView()->renderFile($layoutFile, array('content' => $output), $this);
 		} else {
 			return $output;
 		}
@@ -313,14 +350,14 @@ class Controller extends Component
 	/**
 	 * Renders a view.
 	 * This method differs from [[render()]] in that it does not apply any layout.
-	 * @param string $view the view name. Please refer to [[findViewFile()]] on how to specify a view name.
+	 * @param string $view the view name. Please refer to [[render()]] on how to specify a view name.
 	 * @param array $params the parameters (name-value pairs) that should be made available in the view.
 	 * @return string the rendering result.
 	 * @throws InvalidParamException if the view file does not exist.
 	 */
 	public function renderPartial($view, $params = array())
 	{
-		return Yii::$app->getView()->render($view, $params, $this);
+		return $this->getView()->render($view, $params, $this);
 	}
 
 	/**
@@ -332,7 +369,30 @@ class Controller extends Component
 	 */
 	public function renderFile($file, $params = array())
 	{
-		return Yii::$app->getView()->renderFile($file, $params, $this);
+		return $this->getView()->renderFile($file, $params, $this);
+	}
+
+	/**
+	 * Returns the view object that can be used to render views or view files.
+	 * The [[render()]], [[renderPartial()]] and [[renderFile()]] methods will use
+	 * this view object to implement the actual view rendering.
+	 * @return View the view object that can be used to render views or view files.
+	 */
+	public function getView()
+	{
+		if ($this->_view === null) {
+			$this->_view = Yii::$app->getView();
+		}
+		return $this->_view;
+	}
+
+	/**
+	 * Sets the view object to be used by this controller.
+	 * @param View $view the view object that can be used to render views or view files.
+	 */
+	public function setView($view)
+	{
+		$this->_view = $view;
 	}
 
 	/**
@@ -347,30 +407,33 @@ class Controller extends Component
 	}
 
 	/**
+	 * Finds the view file based on the given view name.
+	 * @param string $view the view name or the path alias of the view file. Please refer to [[render()]]
+	 * on how to specify this parameter.
+	 * @return string the view file path. Note that the file may not exist.
+	 */
+	protected function findViewFile($view)
+	{
+		if (strncmp($view, '@', 1) === 0) {
+			// e.g. "@app/views/main"
+			$file = Yii::getAlias($view);
+		} elseif (strncmp($view, '//', 2) === 0) {
+			// e.g. "//layouts/main"
+			$file = Yii::$app->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
+		} elseif (strncmp($view, '/', 1) === 0) {
+			// e.g. "/site/index"
+			$file = $this->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
+		} else {
+			$file = $this->getViewPath() . DIRECTORY_SEPARATOR . $view;
+		}
+
+		return FileHelper::getExtension($file) === '' ? $file . '.php' : $file;
+	}
+
+	/**
 	 * Finds the applicable layout file.
-	 *
-	 * This method locates an applicable layout file via two steps.
-	 *
-	 * In the first step, it determines the layout name and the context module:
-	 *
-	 * - If [[layout]] is specified as a string, use it as the layout name and [[module]] as the context module;
-	 * - If [[layout]] is null, search through all ancestor modules of this controller and find the first
-	 *   module whose [[Module::layout|layout]] is not null. The layout and the corresponding module
-	 *   are used as the layout name and the context module, respectively. If such a module is not found
-	 *   or the corresponding layout is not a string, it will return false, meaning no applicable layout.
-	 *
-	 * In the second step, it determines the actual layout file according to the previously found layout name
-	 * and context module. The layout name can be
-	 *
-	 * - a path alias (e.g. "@app/views/layouts/main");
-	 * - an absolute path (e.g. "/main"): the layout name starts with a slash. The actual layout file will be
-	 *   looked for under the [[Application::layoutPath|layout path]] of the application;
-	 * - a relative path (e.g. "main"): the actual layout layout file will be looked for under the
-	 *   [[Module::viewPath|view path]] of the context module.
-	 *
-	 * If the layout name does not contain a file extension, it will use the default one `.php`.
-	 *
 	 * @return string|boolean the layout file path, or false if layout is not needed.
+	 * Please refer to [[render()]] on how to specify this parameter.
 	 * @throws InvalidParamException if an invalid path alias is used to specify the layout
 	 */
 	protected function findLayoutFile()

framework/base/View.php

@@ -79,22 +79,29 @@ class View extends Component
 	/**
 	 * Renders a view.
 	 *
-	 * This method will call [[findViewFile()]] to convert the view name into the corresponding view
-	 * file path, and it will then call [[renderFile()]] to render the view.
+	 * This method delegates the call to the [[context]] object:
 	 *
-	 * @param string $view the view name. Please refer to [[findViewFile()]] on how to specify this parameter.
+	 * - If [[context]] is a controller, the [[Controller::renderPartial()]] method will be called;
+	 * - If [[context]] is a widget, the [[Widget::render()]] method will be called;
+	 * - Otherwise, an InvalidCallException exception will be thrown.
+	 *
+	 * @param string $view the view name. Please refer to [[Controller::findViewFile()]]
+	 * and [[Widget::findViewFile()]] on how to specify this parameter.
 	 * @param array $params the parameters (name-value pairs) that will be extracted and made available in the view file.
-	 * @param object $context the context that the view should use for rendering the view. If null,
-	 * existing [[context]] will be used.
 	 * @return string the rendering result
+	 * @throws InvalidCallException if [[context]] is neither a controller nor a widget.
 	 * @throws InvalidParamException if the view cannot be resolved or the view file does not exist.
 	 * @see renderFile
-	 * @see findViewFile
 	 */
-	public function render($view, $params = array(), $context = null)
+	public function render($view, $params = array())
 	{
-		$viewFile = $this->findViewFile($context, $view);
-		return $this->renderFile($viewFile, $params, $context);
+		if ($this->context instanceof Controller) {
+			return $this->context->renderPartial($view, $params);
+		} elseif ($this->context instanceof Widget) {
+			return $this->context->render($view, $params);
+		} else {
+			throw new InvalidCallException('View::render() is not supported for the current context.');
+		}
 	}
 
 	/**
@@ -213,49 +220,6 @@ class View extends Component
 	}
 
 	/**
-	 * Finds the view file based on the given view name.
-	 *
-	 * A view name can be specified in one of the following formats:
-	 *
-	 * - path alias (e.g. "@app/views/site/index");
-	 * - absolute path within application (e.g. "//site/index"): the view name starts with double slashes.
-	 *   The actual view file will be looked for under the [[Application::viewPath|view path]] of the application.
-	 * - absolute path within module (e.g. "/site/index"): the view name starts with a single slash.
-	 *   The actual view file will be looked for under the [[Module::viewPath|view path]] of the currently
-	 *   active module.
-	 * - relative path (e.g. "index"): the actual view file will be looked for under [[Controller::viewPath|viewPath]]
-	 *   of the context object, assuming the context is either a [[Controller]] or a [[Widget]].
-	 *
-	 * If the view name does not contain a file extension, it will use the default one `.php`.
-	 *
-	 * @param object $context the view context object
-	 * @param string $view the view name or the path alias of the view file.
-	 * @return string the view file path. Note that the file may not exist.
-	 * @throws InvalidParamException if the view file is an invalid path alias or the context cannot be
-	 * used to determine the actual view file corresponding to the specified view.
-	 */
-	protected function findViewFile($context, $view)
-	{
-		if (strncmp($view, '@', 1) === 0) {
-			// e.g. "@app/views/main"
-			$file = Yii::getAlias($view);
-		} elseif (strncmp($view, '//', 2) === 0) {
-			// e.g. "//layouts/main"
-			$file = Yii::$app->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
-		} elseif (strncmp($view, '/', 1) === 0) {
-			// e.g. "/site/index"
-			$file = Yii::$app->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
-		} elseif ($context instanceof Controller || $context instanceof Widget) {
-			/** @var $context Controller|Widget */
-			$file = $context->getViewPath() . DIRECTORY_SEPARATOR . $view;
-		} else {
-			throw new InvalidParamException("Unable to resolve the view file for '$view'.");
-		}
-
-		return FileHelper::getExtension($file) === '' ? $file . '.php' : $file;
-	}
-
-	/**
 	 * Creates a widget.
 	 * This method will use [[Yii::createObject()]] to create the widget.
 	 * @param string $class the widget class name or path alias
@@ -265,7 +229,10 @@ class View extends Component
 	public function createWidget($class, $properties = array())
 	{
 		$properties['class'] = $class;
-		return Yii::createObject($properties, $this->context);
+		if (!isset($properties['view'])) {
+			$properties['view'] = $this;
+		}
+		return Yii::createObject($properties, $this);
 	}
 
 	/**
@@ -341,7 +308,6 @@ class View extends Component
 		return $this->beginWidget('yii\widgets\Clip', array(
 			'id' => $id,
 			'renderInPlace' => $renderInPlace,
-			'view' => $this,
 		));
 	}
 
@@ -355,17 +321,25 @@ class View extends Component
 
 	/**
 	 * Begins the rendering of content that is to be decorated by the specified view.
-	 * @param string $view the name of the view that will be used to decorate the content enclosed by this widget.
-	 * Please refer to [[View::findViewFile()]] on how to set this property.
+	 * This method can be used to implement nested layout. For example, a layout can be embedded
+	 * in another layout file specified as '@app/view/layouts/base' like the following:
+	 *
+	 * ~~~
+	 * <?php $this->beginContent('@app/view/layouts/base'); ?>
+	 * ...layout content here...
+	 * <?php $this->endContent(); ?>
+	 * ~~~
+	 *
+	 * @param string $viewFile the view file that will be used to decorate the content enclosed by this widget.
+	 * This can be specified as either the view file path or path alias.
 	 * @param array $params the variables (name=>value) to be extracted and made available in the decorative view.
 	 * @return \yii\widgets\ContentDecorator the ContentDecorator widget instance
 	 * @see \yii\widgets\ContentDecorator
 	 */
-	public function beginContent($view, $params = array())
+	public function beginContent($viewFile, $params = array())
 	{
 		return $this->beginWidget('yii\widgets\ContentDecorator', array(
-			'view' => $this,
-			'viewName' => $view,
+			'viewFile' => $viewFile,
 			'params' => $params,
 		));
 	}
@@ -400,7 +374,6 @@ class View extends Component
 	public function beginCache($id, $properties = array())
 	{
 		$properties['id'] = $id;
-		$properties['view'] = $this;
 		/** @var $cache \yii\widgets\FragmentCache */
 		$cache = $this->beginWidget('yii\widgets\FragmentCache', $properties);
 		if ($cache->getCachedContent() !== false) {

framework/base/Widget.php

@@ -19,9 +19,11 @@ use yii\helpers\FileHelper;
 class Widget extends Component
 {
 	/**
-	 * @var Widget|Controller the owner/creator of this widget. It could be either a widget or a controller.
+	 * @var View the view object that is used to create this widget.
+	 * This property is automatically set by [[View::createWidget()]].
+	 * This property is required by [[render()]] and [[renderFile()]].
 	 */
-	public $owner;
+	public $view;
 	/**
 	 * @var string id of the widget.
 	 */
@@ -32,17 +34,6 @@ class Widget extends Component
 	private static $_counter = 0;
 
 	/**
-	 * Constructor.
-	 * @param Widget|Controller $owner owner/creator of this widget.
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct($owner, $config = array())
-	{
-		$this->owner = $owner;
-		parent::__construct($config);
-	}
-
-	/**
 	 * Returns the ID of the widget.
 	 * @param boolean $autoGenerate whether to generate an ID if it is not set previously
 	 * @return string ID of the widget.
@@ -73,6 +64,18 @@ class Widget extends Component
 
 	/**
 	 * Renders a view.
+	 * The view to be rendered can be specified in one of the following formats:
+	 *
+	 * - path alias (e.g. "@app/views/site/index");
+	 * - absolute path within application (e.g. "//site/index"): the view name starts with double slashes.
+	 *   The actual view file will be looked for under the [[Application::viewPath|view path]] of the application.
+	 * - absolute path within module (e.g. "/site/index"): the view name starts with a single slash.
+	 *   The actual view file will be looked for under the [[Module::viewPath|view path]] of the currently
+	 *   active module.
+	 * - relative path (e.g. "index"): the actual view file will be looked for under [[viewPath]].
+	 *
+	 * If the view name does not contain a file extension, it will use the default one `.php`.
+
 	 * @param string $view the view name. Please refer to [[findViewFile()]] on how to specify a view name.
 	 * @param array $params the parameters (name-value pairs) that should be made available in the view.
 	 * @return string the rendering result.
@@ -80,7 +83,7 @@ class Widget extends Component
 	 */
 	public function render($view, $params = array())
 	{
-		return Yii::$app->getView()->render($view, $params, $this);
+		return $this->view->render($view, $params, $this);
 	}
 
 	/**
@@ -92,7 +95,7 @@ class Widget extends Component
 	 */
 	public function renderFile($file, $params = array())
 	{
-		return Yii::$app->getView()->renderFile($file, $params, $this);
+		return $this->view->renderFile($file, $params, $this);
 	}
 
 	/**
@@ -106,4 +109,28 @@ class Widget extends Component
 		$class = new \ReflectionClass($className);
 		return dirname($class->getFileName()) . DIRECTORY_SEPARATOR . 'views';
 	}
+
+	/**
+	 * Finds the view file based on the given view name.
+	 * @param string $view the view name or the path alias of the view file. Please refer to [[render()]]
+	 * on how to specify this parameter.
+	 * @return string the view file path. Note that the file may not exist.
+	 */
+	protected function findViewFile($view)
+	{
+		if (strncmp($view, '@', 1) === 0) {
+			// e.g. "@app/views/main"
+			$file = Yii::getAlias($view);
+		} elseif (strncmp($view, '//', 2) === 0) {
+			// e.g. "//layouts/main"
+			$file = Yii::$app->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
+		} elseif (strncmp($view, '/', 1) === 0 && Yii::$app->controller !== null) {
+			// e.g. "/site/index"
+			$file = Yii::$app->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
+		} else {
+			$file = $this->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
+		}
+
+		return FileHelper::getExtension($file) === '' ? $file . '.php' : $file;
+	}
 }

framework/web/PageCache.php

@@ -25,11 +25,6 @@ class PageCache extends ActionFilter
 	 */
 	public $varyByRoute = true;
 	/**
-	 * @var View the view object that is used to create the fragment cache widget to implement page caching.
-	 * If not set, the view registered with the application will be used.
-	 */
-	public $view;
-	/**
 	 * @var string the application component ID of the [[\yii\caching\Cache|cache]] object.
 	 */
 	public $cache = 'cache';

framework/widgets/Clip.php

@@ -22,11 +22,6 @@ class Clip extends Widget
 	 */
 	public $id;
 	/**
-	 * @var View the view object for keeping the clip. If not set, the view registered with the application
-	 * will be used.
-	 */
-	public $view;
-	/**
 	 * @var boolean whether to render the clip content in place. Defaults to false,
 	 * meaning the captured clip will not be displayed.
 	 */
@@ -51,7 +46,6 @@ class Clip extends Widget
 		if ($this->renderClip) {
 			echo $clip;
 		}
-		$view = $this->view !== null ? $this->view : Yii::$app->getView();
-		$view->clips[$this->id] = $clip;
+		$this->view->clips[$this->id] = $clip;
 	}
 }

framework/widgets/ContentDecorator.php

@@ -7,10 +7,8 @@
 
 namespace yii\widgets;
 
-use Yii;
 use yii\base\InvalidConfigException;
 use yii\base\Widget;
-use yii\base\View;
 
 /**
  * @author Qiang Xue <qiang.xue@gmail.com>
@@ -19,15 +17,10 @@ use yii\base\View;
 class ContentDecorator extends Widget
 {
 	/**
-	 * @var View the view object for rendering [[viewName]]. If not set, the view registered with the application
-	 * will be used.
+	 * @var string the view file that will be used to decorate the content enclosed by this widget.
+	 * This can be specified as either the view file path or path alias.
 	 */
-	public $view;
-	/**
-	 * @var string the name of the view that will be used to decorate the content enclosed by this widget.
-	 * Please refer to [[View::findViewFile()]] on how to set this property.
-	 */
-	public $viewName;
+	public $viewFile;
 	/**
 	 * @var array the parameters (name=>value) to be extracted and made available in the decorative view.
 	 */
@@ -38,8 +31,8 @@ class ContentDecorator extends Widget
 	 */
 	public function init()
 	{
-		if ($this->viewName === null) {
-			throw new InvalidConfigException('ContentDecorator::viewName must be set.');
+		if ($this->viewFile === null) {
+			throw new InvalidConfigException('ContentDecorator::viewFile must be set.');
 		}
 		ob_start();
 		ob_implicit_flush(false);
@@ -53,7 +46,7 @@ class ContentDecorator extends Widget
 	{
 		$params = $this->params;
 		$params['content'] = ob_get_clean();
-		$view = $this->view !== null ? $this->view : Yii::$app->getView();
-		echo $view->render($this->viewName, $params);
+		// render under the existing context
+		echo $this->view->renderFile($this->viewFile, $params);
 	}
 }

framework/widgets/FragmentCache.php

@@ -64,11 +64,6 @@ class FragmentCache extends Widget
 	 */
 	public $enabled = true;
 	/**
-	 * @var \yii\base\View the view object within which this widget is used. If not set,
-	 * the view registered with the application will be used. This is mainly used by dynamic content feature.
-	 */
-	public $view;
-	/**
 	 * @var array a list of placeholders for embedding dynamic contents. This property
 	 * is used internally to implement the content caching feature. Do not modify it.
 	 */
@@ -81,10 +76,6 @@ class FragmentCache extends Widget
 	{
 		parent::init();
 
-		if ($this->view === null) {
-			$this->view = Yii::$app->getView();
-		}
-
 		if (!$this->enabled) {
 			$this->cache = null;
 		} elseif (is_string($this->cache)) {