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Yaf零基础学习总结14-Yaf内建类之Yaf_View_Interface

作者:用户 来源:互联网 时间:2017-12-01 19:42:06

学习基础

Yaf零基础学习总结14-Yaf内建类之Yaf_View_Interface - 摘要: 本文讲的是Yaf零基础学习总结14-Yaf内建类之Yaf_View_Interface,Yaf给用户提供一个了一个可扩展的、可自定的视图引擎接口,就是Yaf_View_Interface,并且Yaf还内置实现了一个简单的模板引擎Yaf_View_Simple,它只支持只支持PHP脚本。所以我们一般都会用自己的视图引擎(比如Sm

Yaf给用户提供一个了一个可扩展的、可自定的视图引擎接口,就是Yaf_View_Interface,并且Yaf还内置实现了一个简单的模板引擎Yaf_View_Simple,它只支持只支持PHP脚本。所以我们一般都会用自己的视图引擎(比如Smarty)来代替Yaf内置的Yaf_View_Simple。

下面我们以Smarty试图引擎为例来如何实现Yaf的视图接口,Yaf_View_Interface。实现接口之前我们先看下Yaf_View_Interface需要实现的所有成员方法
Yaf_View_Interface {/* 方法 */abstract public bool assign ( string $name [, string $value ] )abstract public bool display ( string $tpl [, array $tpl_vars ] )abstract public void getScriptPath ( void )abstract public string render ( string $tpl [, array $tpl_vars ] )abstract public void setScriptPath ( string $template_dir )}


所以我们一定要实现以上5个方法,以下是代码实例

<?phprequire "/path/to/smarty/Smarty.class.php";class Smarty_Adapter implements Yaf_View_Interface{    /**     * Smarty object     * @var Smarty     */    public $_smarty;    /**     * Constructor     *     * @param string $tmplPath     * @param array $extraParams     * @return void     */    public function __construct($tmplPath = null, $extraParams = array()) {$this->_smarty = new Smarty;if (null !== $tmplPath) {    $this->setScriptPath($tmplPath);}foreach ($extraParams as $key => $value) {    $this->_smarty->$key = $value;}    }    /**     * Set the path to the templates     *     * @param string $path The directory to set as the path.     * @return void     */    public function setScriptPath($path)    {if (is_readable($path)) {    $this->_smarty->template_dir = $path;    return;}throw new Exception('Invalid path provided');    }    /**     * Assign a variable to the template     *     * @param string $key The variable name.     * @param mixed $val The variable value.     * @return void     */    public function __set($key, $val)    {$this->_smarty->assign($key, $val);    }    /**     * Allows testing with empty() and isset() to work     *     * @param string $key     * @return boolean     */    public function __isset($key)    {return (null !== $this->_smarty->get_template_vars($key));    }    /**     * Allows unset() on object properties to work     *     * @param string $key     * @return void     */    public function __unset($key)    {$this->_smarty->clear_assign($key);    }    /**     * Assign variables to the template     *     * Allows setting a specific key to the specified value, OR passing     * an array of key => value pairs to set en masse.     *     * @see __set()     * @param string|array $spec The assignment strategy to use (key or     * array of key => value pairs)     * @param mixed $value (Optional) If assigning a named variable,     * use this as the value.     * @return void     */    public function assign($spec, $value = null) {if (is_array($spec)) {    $this->_smarty->assign($spec);    return;}$this->_smarty->assign($spec, $value);    }    /**     * Clear all assigned variables     *     * Clears all variables assigned to Yaf_View either via     * {@link assign()} or property overloading     * ({@link __get()}/{@link __set()}).     *     * @return void     */    public function clearVars() {$this->_smarty->clear_all_assign();    }    /**     * Processes a template and returns the output.     *     * @param string $name The template to process.     * @return string The output.     */    public function render($name, $value = NULL) {return $this->_smarty->fetch($name);    }    public function display($name, $value = NULL) {echo $this->_smarty->fetch($name);    }}?>


实现之后我们可以在Bootstrap中注册我们的smarty模板引擎了

<?phpclass Bootstrap extends Yaf_Bootstrap_Abstract {    /**     * there are some config for smarty in the config:     *     * smarty.left_delimiter   = "{{"     * smarty.right_delimiter  = "}}"     * smarty.template_dir     = APPLICATION_PATH "/views/scripts/"     * smarty.compile_dir      = APPLICATION_PATH "/views/templates_c/"     * smarty.cache_dir= APPLICATION_PATH "/views/templates_d/"     *     */    public function _initConfig() {$config = Yaf_Application::app()->getConfig();Yaf_Registry::set("config", $config);    }    public function _initLocalName() {/** 将Smarty_Adapter注册为本地类哭 */Yaf_Loader::getInstance()->registerLocalNamespace('Smarty');    }    public function _initSmarty(Yaf_Dispatcher $dispatcher) {$smarty = new Smarty_Adapter(null, Yaf_Registry::get("config")->get("smarty"));$dispatcher->setView($smarty);/* 设置smarty为我们的模板引擎 */    }}?>

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