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<?php
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/**
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* View class file.
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*
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\base;
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use Yii;
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use yii\util\FileHelper;
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use yii\base\Application;
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/**
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* View represents a view object in the MVC pattern.
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*
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* View provides a set of methods (e.g. [[render()]]) for rendering purpose.
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*
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class View extends Component
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{
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/**
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* @var string the layout to be applied when [[render()]] or [[renderContent()]] is called.
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* If not set, it will use the value of [[Application::layout]].
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*/
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public $layout;
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/**
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* @var string the language that the view should be rendered in. If not set, it will use
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* the value of [[Application::language]].
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*/
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public $language;
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/**
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* @var string the language that the original view is in. If not set, it will use
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* the value of [[Application::sourceLanguage]].
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*/
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public $sourceLanguage;
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/**
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* @var boolean whether to localize the view when possible. Defaults to true.
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* Note that when this is true, if a localized view cannot be found, the original view will be rendered.
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* No error will be reported.
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*/
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public $enableI18N = true;
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/**
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* @var boolean whether to theme the view when possible. Defaults to true.
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* Note that theming will be disabled if [[Application::theme]] is not set.
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*/
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public $enableTheme = true;
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/**
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* @var mixed custom parameters that are available in the view template
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*/
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public $params;
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/**
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* @var object the object that owns this view.
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*/
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private $_owner;
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/**
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* @var Widget[] the widgets that are currently not ended
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*/
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private $_widgetStack = array();
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/**
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* Constructor.
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* @param object $owner the owner of this view. This usually is a controller or a widget.
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* @param array $config name-value pairs that will be used to initialize the object properties
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*/
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public function __construct($owner, $config = array())
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{
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$this->_owner = $owner;
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parent::__construct($config);
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}
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/**
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* Returns the owner of this view.
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* @return object the owner of this view.
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*/
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public function getOwner()
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{
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return $this->_owner;
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}
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/**
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* Renders a view within the layout specified by [[owner]].
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* This method is similar to [[renderPartial()]] except that if [[owner]] specifies a layout,
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* this method will embed the view result into the layout and then return it.
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* @param string $view the view to be rendered. This can be either a path alias or a path relative to [[searchPaths]].
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* @param array $params the parameters that should be made available in the view. The PHP function `extract()`
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* will be called on this variable to extract the variables from this parameter.
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* @return string the rendering result
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* @throws InvalidCallException if the view file cannot be found
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* @see renderPartial()
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*/
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public function render($view, $params = array())
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{
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$content = $this->renderPartial($view, $params);
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return $this->renderContent($content);
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}
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/**
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* Renders a text content within the layout specified by [[owner]].
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* If the [[owner]] does not specify any layout, the content will be returned back.
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* @param string $content the content to be rendered
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* @return string the rendering result
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*/
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public function renderContent($content)
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{
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$layoutFile = $this->findLayoutFile();
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if ($layoutFile !== false) {
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return $this->renderFile($layoutFile, array('content' => $content));
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} else {
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return $content;
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}
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}
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/**
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* Renders a view.
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*
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* The method first finds the actual view file corresponding to the specified view.
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* It then calls [[renderFile()]] to render the view file. The rendering result is returned
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* as a string. If the view file does not exist, an exception will be thrown.
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*
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* View name can be a path alias representing an absolute file path (e.g. `@application/views/layout/index`),
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* or a path relative to [[searchPaths]]. The file suffix is optional and defaults to `.php` if not given
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* in the view name.
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*
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* @param string $view the view to be rendered. This can be either a path alias or a path relative to [[searchPaths]].
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* @param array $params the parameters that should be made available in the view. The PHP function `extract()`
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* will be called on this variable to extract the variables from this parameter.
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* @return string the rendering result
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* @throws InvalidCallException if the view file cannot be found
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* @see findViewFile()
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*/
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public function renderPartial($view, $params = array())
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{
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$file = $this->findViewFile($view);
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if ($file !== false) {
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return $this->renderFile($file, $params);
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} else {
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throw new InvalidCallException("Unable to find the view file for view '$view'.");
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}
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}
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/**
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* Renders a view file.
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* This method will extract the given parameters and include the view file.
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* It captures the output of the included view file and returns it as a string.
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* @param string $_file_ the view file.
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* @param array $_params_ the parameters (name-value pairs) that will be extracted and made available in the view file.
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* @return string the rendering result
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*/
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public function renderFile($_file_, $_params_ = array())
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{
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ob_start();
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ob_implicit_flush(false);
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extract($_params_, EXTR_OVERWRITE);
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require($_file_);
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return ob_get_clean();
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}
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public function createWidget($class, $properties = array())
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{
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$properties['class'] = $class;
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return Yii::createObject($properties, $this->_owner);
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}
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public function widget($class, $properties = array(), $captureOutput = false)
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{
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if ($captureOutput) {
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ob_start();
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ob_implicit_flush(false);
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$widget = $this->createWidget($class, $properties);
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$widget->run();
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return ob_get_clean();
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} else {
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$widget = $this->createWidget($class, $properties);
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$widget->run();
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return $widget;
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}
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}
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/**
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* Begins a widget.
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* @param string $class the widget class
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* @param array $properties the initial property values of the widget
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* @return Widget the widget instance
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*/
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public function beginWidget($class, $properties = array())
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{
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$widget = $this->createWidget($class, $properties);
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$this->_widgetStack[] = $widget;
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return $widget;
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}
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/**
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* Ends a widget.
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* Note that the rendering result of the widget is directly echoed out.
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* If you want to capture the rendering result of a widget, you may use
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* [[createWidget()]] and [[Widget::run()]].
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* @return Widget the widget instance
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* @throws Exception if [[beginWidget()]] and [[endWidget()]] calls are not properly nested
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*/
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public function endWidget()
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{
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/** @var $widget Widget */
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if (($widget = array_pop($this->_widgetStack)) !== null) {
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$widget->run();
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return $widget;
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} else {
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throw new Exception("Unmatched beginWidget() and endWidget() calls.");
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}
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}
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/**
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* Begins recording a clip.
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* This method is a shortcut to beginning [[yii\widgets\Clip]]
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* @param string $id the clip ID.
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* @param array $properties initial property values for [[yii\widgets\Clip]]
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*/
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public function beginClip($id, $properties = array())
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{
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$properties['id'] = $id;
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$this->beginWidget('yii\widgets\Clip', $properties);
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}
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/**
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* Ends recording a clip.
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*/
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public function endClip()
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{
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$this->endWidget();
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}
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/**
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* Begins fragment caching.
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* This method will display cached content if it is available.
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* If not, it will start caching and would expect an [[endCache()]]
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* call to end the cache and save the content into cache.
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* A typical usage of fragment caching is as follows,
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*
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* ~~~
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* if($this->beginCache($id)) {
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* // ...generate content here
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* $this->endCache();
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* }
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* ~~~
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*
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* @param string $id a unique ID identifying the fragment to be cached.
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* @param array $properties initial property values for [[yii\widgets\OutputCache]]
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* @return boolean whether we need to generate content for caching. False if cached version is available.
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* @see endCache
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*/
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public function beginCache($id, $properties = array())
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{
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$properties['id'] = $id;
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$cache = $this->beginWidget('yii\widgets\OutputCache', $properties);
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if ($cache->getIsContentCached()) {
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$this->endCache();
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return false;
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} else {
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return true;
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}
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}
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/**
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* Ends fragment caching.
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* This is an alias to [[endWidget()]]
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* @see beginCache
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*/
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public function endCache()
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{
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$this->endWidget();
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}
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/**
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* Begins the rendering of content that is to be decorated by the specified view.
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* @param mixed $view the name of the view that will be used to decorate the content. The actual view script
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* is resolved via {@link getViewFile}. If this parameter is null (default),
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* the default layout will be used as the decorative view.
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* Note that if the current controller does not belong to
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* any module, the default layout refers to the application's {@link CWebApplication::layout default layout};
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* If the controller belongs to a module, the default layout refers to the module's
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* {@link CWebModule::layout default layout}.
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* @param array $params the variables (name=>value) to be extracted and made available in the decorative view.
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* @see endContent
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* @see yii\widgets\ContentDecorator
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*/
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public function beginContent($view, $params = array())
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{
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$this->beginWidget('yii\widgets\ContentDecorator', array(
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'view' => $view,
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'params' => $params,
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));
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}
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/**
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* Ends the rendering of content.
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* @see beginContent
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*/
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public function endContent()
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{
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$this->endWidget();
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}
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/**
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* Finds the view file based on the given view name.
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*
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* The rule for searching for the view file is as follows:
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*
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* - If the view name is given as a path alias, return the actual path corresponding to the alias;
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* - If the view name does NOT start with a slash:
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* * If the view owner is a controller or widget, look for the view file under
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* the controller or widget's view path (see [[Controller::viewPath]] and [[Widget::viewPath]]);
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* * If the view owner is an object, look for the view file under the "views" sub-directory
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* of the directory containing the object class file;
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* * Otherwise, look for the view file under the application's [[Application::viewPath|view path]].
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* - If the view name starts with a single slash, look for the view file under the currently active
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* module's [[Module::viewPath|view path]];
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* - If the view name starts with double slashes, look for the view file under the application's
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* [[Application::viewPath|view path]].
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*
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* If [[enableTheme]] is true and there is an active application them, the method will also
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* attempt to use a themed version of the view file, when available.
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*
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* @param string $view the view name or path alias. If the view name does not specify
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* the view file extension name, it will use `.php` as the extension name.
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* @return string|boolean the view file path if it exists. False if the view file cannot be found.
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*/
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public function findViewFile($view)
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{
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if (FileHelper::getExtension($view) === '') {
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$view .= '.php';
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}
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if (strncmp($view, '@', 1) === 0) {
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// e.g. "@application/views/common"
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$file = Yii::getAlias($view);
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} elseif (strncmp($view, '/', 1) !== 0) {
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// e.g. "index"
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if ($this->_owner instanceof Controller || $this->_owner instanceof Widget) {
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$path = $this->_owner->getViewPath() . DIRECTORY_SEPARATOR . $view;
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} elseif ($this->_owner !== null) {
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$class = new \ReflectionClass($this->_owner);
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$path = dirname($class->getFileName()) . DIRECTORY_SEPARATOR . 'views';
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} else {
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$path = Yii::$application->getViewPath();
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}
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$file = $path . DIRECTORY_SEPARATOR . $view;
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} elseif (strncmp($view, '//', 2) !== 0 && Yii::$application->controller !== null) {
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// e.g. "/site/index"
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$file = Yii::$application->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
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} else {
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// e.g. "//layouts/main"
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$file = Yii::$application->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
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}
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if (is_file($file)) {
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if ($this->enableTheme && ($theme = Yii::$application->getTheme()) !== null) {
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$file = $theme->apply($file);
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}
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return $this->enableI18N ? FileHelper::localize($file, $this->language, $this->sourceLanguage) : $file;
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} else {
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return false;
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}
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}
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/**
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* Finds the layout file for the current [[owner]].
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* The method will return false if [[owner]] is not a controller.
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* When [[owner]] is a controller, the following algorithm is used to determine the layout file:
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*
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* - If `content` is not a controller or if `owner.layout` is false, it will return false;
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* - If `owner.layout` is a string, it will look for the layout file under the [[Module::layoutPath|layout path]]
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* of the controller's parent module;
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* - If `owner.layout` is null, the following steps are taken to resolve the actual layout to be returned:
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* * Check the `layout` property of the parent module. If it is null, check the grand parent module and so on
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* until a non-null layout is encountered. Let's call this module the *effective module*.
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* * If the layout is null or false, it will return false;
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* * Otherwise, it will look for the layout file under the layout path of the effective module.
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*
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* The themed layout file will be returned if theme is enabled and the theme contains such a layout file.
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*
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* @return string|boolean the layout file path, or false if the owner does not need layout.
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* @throws InvalidCallException if the layout file cannot be found
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*/
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public function findLayoutFile()
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{
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if ($this->layout === null || !$this->_owner instanceof Controller) {
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$layout = Yii::$application->layout;
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} elseif ($this->_owner->layout !== false) {
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}
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if (!$this->_owner instanceof Controller || $this->_owner->layout === false) {
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return false;
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}
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|
/** @var $module Module */
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$module = $this->_owner->module;
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while ($module !== null && $module->layout === null) {
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$module = $module->module;
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}
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if ($module === null || $module->layout === null || $module->layout === false) {
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|
return false;
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}
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|
|
$view = $module->layout;
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|
|
if (FileHelper::getExtension($view) === '') {
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|
|
$view .= '.php';
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|
}
|
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|
if (strncmp($view, '@', 1) === 0) {
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|
$file = Yii::getAlias($view);
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|
} elseif (strncmp($view, '/', 1) !== 0) {
|
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|
|
// e.g. "main"
|
|
|
|
if ($this->_owner instanceof Controller || $this->_owner instanceof Widget) {
|
|
|
|
$path = $this->_owner->getViewPath() . DIRECTORY_SEPARATOR . $view;
|
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|
|
} elseif ($this->_owner !== null) {
|
|
|
|
$class = new \ReflectionClass($this->_owner);
|
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|
|
$path = dirname($class->getFileName()) . DIRECTORY_SEPARATOR . 'views';
|
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|
|
} else {
|
|
|
|
$path = Yii::$application->getViewPath();
|
|
|
|
}
|
|
|
|
$file = $path . DIRECTORY_SEPARATOR . $view;
|
|
|
|
} elseif (strncmp($view, '//', 2) !== 0 && Yii::$application->controller !== null) {
|
|
|
|
// e.g. "/main"
|
|
|
|
$file = Yii::$application->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
|
|
|
|
} else {
|
|
|
|
// e.g. "//main"
|
|
|
|
$file = Yii::$application->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/');
|
|
|
|
} elseif (strncmp($view, '/', 1) === 0) {
|
|
|
|
$file = $this->findAbsoluteViewFile($view);
|
|
|
|
} else {
|
|
|
|
$paths[] = $module->getLayoutPath();
|
|
|
|
$file = false;
|
|
|
|
foreach ($paths as $path) {
|
|
|
|
$f = Yii::getAlias($path . '/' . $view);
|
|
|
|
if ($f !== false && is_file($f)) {
|
|
|
|
$file = $f;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if ($file === false || !is_file($file)) {
|
|
|
|
throw new InvalidCallException("Unable to find the layout file for layout '{$module->layout}' (specified by " . get_class($module) . ")");
|
|
|
|
} elseif ($this->enableI18N) {
|
|
|
|
return FileHelper::localize($file, $this->language, $this->sourceLanguage);
|
|
|
|
} else {
|
|
|
|
return $file;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|