yii2源码学习笔记(十一），yii2源码学习笔记_PHP教程
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yii2源码学习笔记(十一），yii2源码学习笔记
Controller控制器类，是所有控制器的基类，用于调用模型和布局。
1 <?php 2 /** 3 * @link http://www.yiiframework.com/ 4 * @copyright Copyright (c) 2008 Yii Software LLC 5 * @license http://www.yiiframework.com/license/ 6 */ 7 8 namespace yii\base; 9 10 use Yii; 11 12 /** 13 * Controller is the base class for classes containing controller logic. 14 * 控制器，是所用控制器类的基类 15 * @property Module[] $modules All ancestor modules that this controller is located within. This property is 16 * read-only.只读属性 当前控制器的所有模块 17 * @property string $route The route (module ID, controller ID and action ID) of the current request. This 18 * property is read-only.当前请求的路径 只读属性 可以获取到请求的路径 19 * @property string $uniqueId The controller ID that is prefixed with the module ID (if any). This property is 20 * read-only.为前缀的controller ID 唯一标识 21 * @property View|\yii\web\View $view The view object that can be used to render views or view files. 22 * 视图用来传递视图或视图文件. 23 * @property string $viewPath The directory containing the view files for this controller. This property is 24 * read-only. 包含当前控制器的视图目录 25 * 26 * @author Qiang Xue <qiang.xue@gmail.com> 27 * @since 2.0 28 */ 29 class Controller extends Component implements ViewContextInterface 30 { 31 /** 32 * @event ActionEvent an event raised right before executing a controller action. 33 * ActionEvent事件提出正确的执行器动作之前执行。 34 * You may set [[ActionEvent::isValid]] to be false to cancel the action execution. 35 * 如果对事件的isValid属性设置为false，将取消action的执行 36 */ 37 const EVENT_BEFORE_ACTION = 'beforeAction'; 38 /** 39 * @event ActionEvent an event raised right after executing a controller action. 40 * 在执行controller操作后触发的事件 41 */ 42 const EVENT_AFTER_ACTION = 'afterAction'; 43 44 /** 45 * @var string the ID of this controller. 46 * 控制器id 47 */ 48 public $id; 49 /** 50 * @var Module $module the module that this controller belongs to. 51 * 所属模块 52 */ 53 public $module; 54 /** 55 * @var string the ID of the action that is used when the action ID is not specified 56 * in the request. Defaults to 'index'.控制器中默认动作，默认为index 57 */ 58 public $defaultAction = 'index'; 59 /** 60 * @var string|boolean the name of the layout to be applied to this controller's views. 61 * 布局的名称 应用到该控制器的视图。 62 * This property mainly affects the behavior of [[render()]].此属性主要影响[[render()]]行为 63 * Defaults to null, meaning the actual layout value should inherit that from [[module]]'s layout value. 64 * If false, no layout will be applied. 65 * 如果设置为false，则不使用布局文件 66 */ 67 public $layout; 68 /** 69 * @var Action the action that is currently being executed. This property will be set 70 * by [[run()]] when it is called by [[Application]] to run an action. 71 * 当前执行的操作，可在事件中根据这个action来执行不同的操作 72 */ 73 public $action; 74 75 /** 76 * @var View the view object that can be used to render views or view files. 77 * 视图对象，用来定义输出的视图文件 78 */ 79 private $_view; 80 81 82 /** 83 * @param string $id the ID of this controller.控制器的ID 84 * @param Module $module the module that this controller belongs to.控制器的模块 85 * @param array $config name-value pairs that will be used to initialize the object properties. 86 * 初始化对像时的配置文件 87 */ 88 public function __construct($id, $module, $config = []) 89 { 90 //初始化控制器id，模块，根据配置文件初始化控制器对象 91 $this->id = $id; 92 $this->module = $module; 93 parent::__construct($config); 94 } 95 96 /** 97 * Declares external actions for the controller.定义action声明控制器的外部操作 98 * This method is meant to be overwritten to declare external actions for the controller. 99 * It should return an array, with array keys being action IDs, and array values the corresponding 100 * action class names or action configuration arrays. For example, 101 * 这个方法指定独立的action，返回格式为数组，name为action的id,value为action类的实现， 102 * ~~~ 103 * return [ 104 * 'action1' => 'app\components\Action1', 105 * 'action2' => [ 106 * 'class' => 'app\components\Action2', 107 * 'property1' => 'value1', 108 * 'property2' => 'value2', 109 * ], 110 * ]; 111 * ~~~ 112 * 113 * [[\Yii::createObject()]] will be used later to create the requested action 114 * using the configuration provided here. 115 * 使用此处提供的配置来创建请求的操作。 116 */ 117 public function actions() 118 { 119 return []; 120 } 121 122 /** 123 * Runs an action within this controller with the specified action ID and parameters. 124 * 控制器中运行指定的操作标识和参数。 125 * If the action ID is empty, the method will use [[defaultAction]]. 126 * 如果没有定义ID，会调用默认操作 127 * @param string $id the ID of the action to be executed. 要执行的动作标识。 128 * @param array $params the parameters (name-value pairs) to be passed to the action. 129 * 传递给操作的参数。 130 * @return mixed the result of the action. 操作结果 131 * @throws InvalidRouteException if the requested action ID cannot be resolved into an action successfully. 132 * @see createAction() 133 */ 134 public function runAction($id, $params = []) 135 { 136 $action = $this->createAction($id);//创建操作 137 if ($action === null) {//创建失败，抛出异常 138 throw new InvalidRouteException('Unable to resolve the request: ' . $this->getUniqueId() . '/' . $id); 139 } 140 141 Yii::trace("Route to run: " . $action->getUniqueId(), __METHOD__); 142 143 if (Yii::$app->requestedAction === null) { 144 // 记录当前的操作为requestedAction 145 Yii::$app->requestedAction = $action; 146 } 147 148 $oldAction = $this->action;//将操作中的信息保存 149 $this->action = $action;//写入属性 150 //保存当前控制器的所有父模块 151 $modules = []; 152 $runAction = true; 153 154 // call beforeAction on modules 从外到里一层层执行module的beforeAction 155 foreach ($this->getModules() as $module) { 156 if ($module->beforeAction($action)) { 157 // 将执行成功的module放入到$modules中，顺序会颠倒 158 array_unshift($modules, $module); 159 } else { 160 // 执行失败，就标记一下 161 $runAction = false; 162 break; 163 } 164 } 165 166 $result = null; 167 168 if ($runAction && $this->beforeAction($action)) { 169 // run the action 执行成功就执行action 170 $result = $action->runWithParams($params); 171 // 执行controller本身的afterAction 172 $result = $this->afterAction($action, $result); 173 174 // call afterAction on modules 从里到外一层层执行所有 175 foreach ($modules as $module) { 176 /* @var $module Module */ 177 $result = $module->afterAction($action, $result); 178 } 179 } 180 181 $this->action = $oldAction; 182 183 return $result; 184 }
yii2\base\Controller.php
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