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