Yii源码阅读笔记(二十七)
Theme 类,即一个应用的主题,主要通过替换路径实现主题的应用,里边的方法为获取根路径和根链接,以及应用主题的方法:
namespace yii\base; use Yii; use yii\helpers\FileHelper; /** * Theme represents an application theme. * Theme 类,即一个应用的主题 * * When [[View]] renders a view file, it will check the [[View::theme|active theme]] * to see if there is a themed version of the view file exists. If so, the themed version will be rendered instead. * 视图对象[[View]]渲染视图文件的时候,会检查视图的主题[[View::theme|active theme]]是否存在,如果存在则渲染主题取代默认样式 * * A theme is a directory consisting of view files which are meant to replace their non-themed counterparts. * * Theme uses [[pathMap]] to achieve the view file replacement: * Theme 通过[[pathMap]]来实现视图文件替换: * * 1. It first looks for a key in [[pathMap]] that is a substring of the given view file path; * 首先在[[pathMap]] 中查找关键字,该关键字是一个给定的视图路径的子字符串 * 2. If such a key exists, the corresponding value will be used to replace the corresponding part * in the view file path; * 如果该关键字存在,则用对应得值替换给定的视图文件路径中对应的部分 * 3. It will then check if the updated view file exists or not. If so, that file will be used * to replace the original view file. * 然后检查替换后的路径对应的文件是否存在,如果存在就替换原来的文件 * 4. If Step 2 or 3 fails, the original view file will be used. * 如果2和3失败的话,就返回原来的路径 * * For example, if [[pathMap]] is `['@app/views' => '@app/themes/basic']`, * then the themed version for a view file `@app/views/site/index.php` will be * `@app/themes/basic/site/index.php`. * * It is possible to map a single path to multiple paths. For example, * * ```php * 'pathMap' => [ * '@app/views' => [ * '@app/themes/christmas', * '@app/themes/basic', * ], * ] * ``` * * In this case, the themed version could be either `@app/themes/christmas/site/index.php` or * `@app/themes/basic/site/index.php`. The former has precedence over the latter if both files exist. * 主题的对应关系可以是一个视图文件对应多个主题文件 * * To use a theme, you should configure the [[View::theme|theme]] property of the "view" application * component like the following: * * ```php * 'view' => [ * 'theme' => [ * 'basePath' => '@app/themes/basic', * 'baseUrl' => '@web/themes/basic', * ], * ], * ``` * * The above configuration specifies a theme located under the "themes/basic" directory of the Web folder * that contains the entry script of the application. If your theme is designed to handle modules, * you may configure the [[pathMap]] property like described above. * * @property string $basePath The root path of this theme. All resources of this theme are located under this * directory. * @property string $baseUrl The base URL (without ending slash) for this theme. All resources of this theme * are considered to be under this base URL. * * @author Qiang Xue <qiang.xue@gmail.com> * @since 2.0 */ class Theme extends Component { /** * @var array the mapping between view directories and their corresponding themed versions. * This property is used by [[applyTo()]] when a view is trying to apply the theme. * Path aliases can be used when specifying directories. * If this property is empty or not set, a mapping [[Application::basePath]] to [[basePath]] will be used. * 路径映射属性--用来设置替换映射关系的 */ public $pathMap; /** * @var 设置要访问的资源的url,没有结尾的斜线(without ending slash) */ private $_baseUrl; /** * @return string the base URL (without ending slash) for this theme. All resources of this theme are considered * to be under this base URL. * @return string 返回值为当前主题的基础链接,即访问链接,其他的资源都在该链接下 */ public function getBaseUrl() { return $this->_baseUrl; } /** * @param string $url the base URL or path alias for this theme. All resources of this theme are considered * to be under this base URL. * 设置基础访问链接 */ public function setBaseUrl($url) { $this->_baseUrl = rtrim(Yii::getAlias($url), '/'); } /** * @var array 当前主题的根路径,该主题的资源都在该目录下 */ private $_basePath; /** * @return string the root path of this theme. All resources of this theme are located under this directory. * @return string 返回当前主题的根路径,该主题的资源都在该目录下 * @see pathMap */ public function getBasePath() { return $this->_basePath; } /** * @param string $path the root path or path alias of this theme. All resources of this theme are located * under this directory. * 设置当前主题的根路径 * @see pathMap */ public function setBasePath($path) { $this->_basePath = Yii::getAlias($path); } /** * Converts a file to a themed file if possible. * 将一个文件替换为允许替换的主题文件---主题的应用原理 * If there is no corresponding themed file, the original file will be returned. * 如果没有对应的主题文件,将返回源文件 * @param string $path the file to be themed * @return string the themed file, or the original file if the themed version is not available. * @throws InvalidConfigException if [[basePath]] is not set */ public function applyTo($path) { $pathMap = $this->pathMap;//取得路径映射[[pathMap]]的值 if (empty($pathMap)) {//如果[[pathMap]]没有设置值,则取当前主题的根路径,否则抛出异常 if (($basePath = $this->getBasePath()) === null) { throw new InvalidConfigException('The "basePath" property must be set.'); } $pathMap = [Yii::$app->getBasePath() => [$basePath]];//设置$pathMap的值为[模块根路径=>主题根路径]的形式 } //对路径中的"/"、“\”进行统一替换 $path = FileHelper::normalizePath($path); foreach ($pathMap as $from => $tos) { //映射数组中的来源(旧值) $from = FileHelper::normalizePath(Yii::getAlias($from)) . DIRECTORY_SEPARATOR; //如果在$path中有可替换的旧值 if (strpos($path, $from) === 0) { $n = strlen($from); //对目标值循环 foreach ((array) $tos as $to) { $to = FileHelper::normalizePath(Yii::getAlias($to)) . DIRECTORY_SEPARATOR; //把$path中的$from替换为$to $file = $to . substr($path, $n); //如果是文件,直接返回 if (is_file($file)) { return $file; } } } } return $path; } /** * Converts a relative URL into an absolute URL using [[baseUrl]]. * 将一个相对URL替换为绝对URL * @param string $url the relative URL to be converted. * @return string the absolute URL * @throws InvalidConfigException if [[baseUrl]] is not set */ public function getUrl($url) { if (($baseUrl = $this->getBaseUrl()) !== null) { return $baseUrl . '/' . ltrim($url, '/');//通过取得[[baseUrl]]的值拼接出当前主题的绝对URL } else { throw new InvalidConfigException('The "baseUrl" property must be set.'); } } /** * Converts a relative file path into an absolute one using [[basePath]]. * 通过相对路径生成绝对路径 * @param string $path the relative file path to be converted. * @return string the absolute file path * @throws InvalidConfigException if [[basePath]] is not set */ public function getPath($path) { if (($basePath = $this->getBasePath()) !== null) { return $basePath . DIRECTORY_SEPARATOR . ltrim($path, '/\\');//通过取得[[basePath]]的值拼接出当前主题的绝对路径 } else { throw new InvalidConfigException('The "basePath" property must be set.'); } } }
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