yii2源码学习笔记(十九)
view剩余代码
- /**
- * @return string|boolean the view file currently being rendered. False if no view file is being rendered.
- * 当前正在渲染的视图文件
- */
- public function getViewFile()
- {
- return end($this->_viewFiles);
- }
- /**
- * This method is invoked right before [[renderFile()]] renders a view file.
- * The default implementation will trigger the [[EVENT_BEFORE_RENDER]] event.
- * 前置事件,执行[renderFile()]时被调用,默认触发[[EVENT_BEFORE_RENDER]]事件
- * If you override this method, make sure you call the parent implementation first.
- * @param string $viewFile the view file to be rendered. 要渲染的视图文件。
- * @param array $params the parameter array passed to the [[render()]] method.
- * 参数数组传递到[render()]方法。
- * @return boolean whether to continue rendering the view file. 是否继续渲染视图文件。
- */
- public function beforeRender($viewFile, $params)
- {
- $event = new ViewEvent([//实例化ViewEvent
- 'viewFile' => $viewFile,
- 'params' => $params,
- ]);
- $this->trigger(self::EVENT_BEFORE_RENDER, $event);//触发[EVENT_BEFORE_RENDER]事件
- return $event->isValid;//判断是否继续渲染文件
- }
- /**
- * This method is invoked right after [[renderFile()]] renders a view file.
- * The default implementation will trigger the [[EVENT_AFTER_RENDER]] event.
- * 后置事件,在执行[renderFile()]方法后被调用,默认触发[[EVENT_AFTER_RENDER]]事件
- * If you override this method, make sure you call the parent implementation first.
- * @param string $viewFile the view file being rendered.要渲染的视图文件。
- * @param array $params the parameter array passed to the [[render()]] method.
- * 参数数组传递到[render()]方法。
- * @param string $output the rendering result of the view file. Updates to this parameter
- * will be passed back and returned by [[renderFile()]].
- * 返回视图渲染的结果
- */
- public function afterRender($viewFile, $params, &$output)
- {
- if ($this->hasEventHandlers(self::EVENT_AFTER_RENDER)) {//判断[EVENT_AFTER_RENDER]事件是否存在
- $event = new ViewEvent([
- 'viewFile' => $viewFile,
- 'params' => $params,
- 'output' => $output,
- ]);
- //触发[EVENT_AFTER_RENDER]事件
- $this->trigger(self::EVENT_AFTER_RENDER, $event);
- $output = $event->output;//返回结果
- }
- }
- /**
- * Renders a view file as a PHP script.
- * 返回一个视图文件当作PHP脚本
- * This method treats the view file as a PHP script and includes the file.
- * It extracts the given parameters and makes them available in the view file.
- * The method captures the output of the included view file and returns it as a string.
- * 将传入的参数转换为变量,包含并执行view文件,返回执行结果
- * This method should mainly be called by view renderer or [[renderFile()]].
- *
- * @param string $_file_ the view file. 视图文件
- * @param array $_params_ the parameters (name-value pairs) that will be extracted and made available in the view file.
- * @return string the rendering result 执行结果
- */
- public function renderPhpFile($_file_, $_params_ = [])
- {
- ob_start(); //打开输出缓冲
- ob_implicit_flush(false); //关闭缓冲区
- extract($_params_, EXTR_OVERWRITE);// 将一个数组转换为变量使用
- require($_file_);
- return ob_get_clean();//得到缓冲区的内容并清除当前输出缓冲
- }
- /**
- * Renders dynamic content returned by the given PHP statements. 渲染动态内容
- * This method is mainly used together with content caching (fragment caching and page caching)
- * 用来聚合缓存的内容
- * when some portions of the content (called *dynamic content*) should not be cached.
- * The dynamic content must be returned by some PHP statements.
- * 渲染某些被PHP语句返回的动态内容
- * @param string $statements the PHP statements for generating the dynamic content.生成动态内容的PHP语句。
- * @return string the placeholder of the dynamic content, or the dynamic content if there is no
- * active content cache currently. 动态内容占位符 如果当前没有有效的内容缓存,调用evaluateDynamicContent输出
- */
- public function renderDynamic($statements)
- {
- if (!empty($this->cacheStack)) {//动态内容的列表不为空
- $n = count($this->dynamicPlaceholders);//统计动态内容条数
- $placeholder = "<![CDATA[YII-DYNAMIC-$n]]>";//生成占位符
- $this->addDynamicPlaceholder($placeholder, $statements);//添加动态内容占位符
- return $placeholder;
- } else {//没有有效缓存 执行传入的PHP语句,返回执行结果
- return $this->evaluateDynamicContent($statements);
- }
- }
- /**
- * Adds a placeholder for dynamic content. 添加一个动态内容占位符
- * This method is internally used. 内部使用
- * @param string $placeholder the placeholder name 占位符名称
- * @param string $statements the PHP statements for generating the dynamic content
- * 生成动态内容的PHP语句
- */
- public function addDynamicPlaceholder($placeholder, $statements)
- {
- foreach ($this->cacheStack as $cache) {
- $cache->dynamicPlaceholders[$placeholder] = $statements;//添加动态内容占位符
- }
- $this->dynamicPlaceholders[$placeholder] = $statements;//给当前视图添加动态内容占位符
- }
- /**
- * Evaluates the given PHP statements. 给定的PHP语句的值
- * This method is mainly used internally to implement dynamic content feature.内部使用实现动态内容功能
- * @param string $statements the PHP statements to be evaluated. PHP语句进行计算
- * @return mixed the return value of the PHP statements. PHP语句的值
- */
- public function evaluateDynamicContent($statements)
- {
- return eval($statements);
- }
- /**
- * Begins recording a block.
- * This method is a shortcut to beginning [[Block]]
- * 数据块开始的标记,该方法是开始[Block]的快捷方式
- * 数据块可以在一个地方指定视图内容在另一个地方显示,通常和布局一起使用
- * @param string $id the block ID. 数据块标识
- * @param boolean $renderInPlace whether to render the block content in place. 是否渲染块内容。
- * Defaults to false, meaning the captured block will not be displayed.
- * @return Block the Block widget instance 数据块部件实例
- */
- public function beginBlock($id, $renderInPlace = false)
- {
- return Block::begin([
- 'id' => $id,//数据块唯一标识
- 'renderInPlace' => $renderInPlace,//是否显示标识
- 'view' => $this,
- ]);
- }
- /**
- * Ends recording a block. 数据块结束标识
- */
- public function endBlock()
- {
- Block::end();
- }
- /**
- * Begins the rendering of content that is to be decorated by the specified view.
- * This method can be used to implement nested layout. For example, a layout can be embedded
- * in another layout file specified as '@app/views/layouts/base.php' like the following:
- * 开始指定的view渲染内容,用来实现嵌套布局,传入的第一个参数为布局文件的路径
- * ~~~
- * <?php $this->beginContent('@app/views/layouts/base.php'); ?>
- * ...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.布局文件的路径或路径别名。
- * @param array $params the variables (name => value) to be extracted and made available in the decorative view.
- * 可以在视图中运用的参数
- * @return ContentDecorator the ContentDecorator widget instance 部件实例
- * @see ContentDecorator
- */
- public function beginContent($viewFile, $params = [])
- {
- return ContentDecorator::begin([
- 'viewFile' => $viewFile,
- 'params' => $params,
- 'view' => $this,
- ]);
- }
- /**
- * Ends the rendering of content.结束渲染内容
- */
- public function endContent()
- {
- ContentDecorator::end();
- }
- /**
- * Begins fragment caching. 开始片段缓存
- * This method will display cached content if it is available.
- * If not, it will start caching and would expect an [[endCache()]]
- * call to end the cache and save the content into cache.
- * 展示可用的缓存内容,否则将开始缓存内容直到出现[endCache()]方法
- * A typical usage of fragment caching is as follows,
- *
- * ~~~
- * if ($this->beginCache($id)) {
- * // ...generate content here
- * $this->endCache();
- * }
- * ~~~
- *
- * @param string $id a unique ID identifying the fragment to be cached.缓存片段的唯一标识
- * @param array $properties initial property values for [[FragmentCache]]初始属性[FragmentCache]
- * @return boolean whether you should generate the content for caching. 是否生成缓存的内容。
- * False if the cached version is available.
- */
- public function beginCache($id, $properties = [])
- {
- $properties['id'] = $id; //片段标识
- $properties['view'] = $this; //调用初始化属性
- /* @var $cache FragmentCache */
- $cache = FragmentCache::begin($properties);
- if ($cache->getCachedContent() !== false) {
- $this->endCache();//从缓存中读取到了缓存的内容,则渲染内容并返回 false,不再进行缓存
- return false;
- } else {
- return true;
- }
- }
- /**
- * Ends fragment caching. 结束片段缓存
- */
- public function endCache()
- {
- FragmentCache::end();
- }
- /**
- * Marks the beginning of a page.页面开始标记
- */
- public function beginPage()
- {
- ob_start(); //打开输出缓冲
- ob_implicit_flush(false);//关闭缓冲区
- $this->trigger(self::EVENT_BEGIN_PAGE);
- }
- /**
- * Marks the ending of a page. 页面结束标记
- */
- public function endPage()
- {
- $this->trigger(self::EVENT_END_PAGE);
- ob_end_flush();//关闭输出缓冲区
- }
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