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Zend Framework教程-Zend_Layout-布局助手Layout

来源：程序员人生发布时间：2013-11-02 08:46:51 阅读次数：3275次

一、作用

布局的作用和模版的作用类似。可以认为是把网站通用、公共的部分拿出来作为通用的页面框架。例如一个基本的web页面，可能页面的头和尾都是一样，不一样的可能只是内容body部分不一样，可以把公共的部分做成模版。不仅可以提高开发效率，也为后期的维护带来方便。

二、使用

这里举一个简单的例子。

首先用zend studio创建一个基本的zend framework项目：layout_demo1

结构大概如下“

├─.settings├─application│  ├─configs│  ├─controllers│  ├─models│  └─views│      ├─helpers│      └─scripts│          ├─error│          └─index├─docs├─library├─public└─tests    ├─application    │  └─controllers    └─library

1.加入layout功能：

应用配置文件/layout_demo2/application/configs/application.ini，加入如下配置

resources.frontController.controllerDirectory = APPLICATION_PATH "/controllers"
resources.frontController.params.displayExceptions = 0

resources.layout.layoutPath = APPLICATION_PATH "/layouts/scripts/"
[staging : production]

2.相应的目录和布局模版文件 /layout_demo2/application/layouts/scripts/layout.phtml

├─application│  ├─configs│  ├─controllers│  ├─layouts│  │  └─scripts│  ├─models│  └─views

layout.html类似如下：

<!doctype html><html>	<head>		<meta http-equiv="Content-Type" content="text/html;charset=utf-8">		<title>my app</title>		<body>			<div id="header">				header			</div>			<div id="content">				<?php echo $this -> layout() -> content;?>			</div>			<div id="footer">				header			</div>		</body></html>

这里的

<?php echo $this -> layout() -> content;?>

是比较重要的。表示此处为布局的内容，也就是会动态变化的地方。

这样，运行一下程序

www.localzend.com/layout_demo1/public/

生成的html源码如下

<!doctype html><html>	<head>		<meta http-equiv="Content-Type" content="text/html;charset=utf-8">		<title>my app</title>		<body>			<div id="header">				header			</div>			<div id="content">				<style>    a:link,    a:visited    {        color: #0398CA;    }    span#zf-name    {        color: #91BE3F;    }    div#welcome    {        color: #FFFFFF;        background-image: url(http://framework.zend.com/images/bkg_header.jpg);        width:  600px;        height: 400px;        border: 2px solid #444444;        overflow: hidden;        text-align: center;    }    div#more-information    {        background-image: url(http://framework.zend.com/images/bkg_body-bottom.gif);        height: 100%;    }</style><div id="welcome">    <h1>Welcome to the <span id="zf-name">Zend Framework!</span></h1>    <h3>This is your project's main page</h3>    <div id="more-information">        <p><img src="http://framework.zend.com/images/PoweredBy_ZF_4LightBG.png" /></p>        <p>            Helpful Links: <br />            <a href="http://framework.zend.com/">Zend Framework Website</a> |            <a href="http://framework.zend.com/manual/en/">Zend Framework Manual</a>        </p>    </div></div>			</div>			<div id="footer">				header			</div>		</body></html>

中间部分就是/layout_demo1/application/views/scripts/index/index.phtml的内容。

注入：可以通过zf的命令工具自动生成layout的配置和文件。

命令如下:

zf enable layout

可以参考命令行章节

三、配置

1.自定义存放位置和名称可以通过application.ini配置文件配置布局文件的存放位置以及布局文件的名称，例如:

resources.layout.layoutPath = APPLICATION_PATH "/mylayouts/scripts"resources.layout.layout = "mylayout"

2.在action中使用layout对象

可以通过

$layout = $this->_helper->layout();

或者

$helper = $this->_helper->getHelper('Layout');$layout = $helper->getLayoutInstance();

获取布局对象。

可以通过如下方式禁用当前action使用布局模式

$layout->disableLayout();

可以通过

$layout->setLayout('other');

来设置使用另一个布局文件

可以通过来传递赋值

$layout->assign('headertitle', 'app title');

$layout->somekey = "value"

3.其它获取layout对象的方法

(1)

$layout = Zend_Layout::getMvcInstance();

(2)

$layout = $bootstrap->getResource('Layout');

四、其它用法，实现原理

具体其它的使用方法可以参考

Zend_Layout_Controller_Action_Helper_Layout类，

Zend_Layout_Controller_Plugin_Layout类

Zend_View_Helper_Layout类

不言自明。

<?php/** Zend_Controller_Action_Helper_Abstract */require_once 'Zend/Controller/Action/Helper/Abstract.php';/** * Helper for interacting with Zend_Layout objects * * @uses       Zend_Controller_Action_Helper_Abstract * @category   Zend * @package    Zend_Controller * @subpackage Zend_Controller_Action * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License */class Zend_Layout_Controller_Action_Helper_Layout extends Zend_Controller_Action_Helper_Abstract{    /**     * @var Zend_Controller_Front     */    protected $_frontController;    /**     * @var Zend_Layout     */    protected $_layout;    /**     * @var bool     */    protected $_isActionControllerSuccessful = false;    /**     * Constructor     *     * @param  Zend_Layout $layout     * @return void     */    public function __construct(Zend_Layout $layout = null)    {        if (null !== $layout) {            $this->setLayoutInstance($layout);        } else {            /**             * @see Zend_Layout             */            require_once 'Zend/Layout.php';            $layout = Zend_Layout::getMvcInstance();        }        if (null !== $layout) {            $pluginClass = $layout->getPluginClass();            $front = $this->getFrontController();            if ($front->hasPlugin($pluginClass)) {                $plugin = $front->getPlugin($pluginClass);                $plugin->setLayoutActionHelper($this);            }        }    }    public function init()    {        $this->_isActionControllerSuccessful = false;    }    /**     * Get front controller instance     *     * @return Zend_Controller_Front     */    public function getFrontController()    {        if (null === $this->_frontController) {            /**             * @see Zend_Controller_Front             */            require_once 'Zend/Controller/Front.php';            $this->_frontController = Zend_Controller_Front::getInstance();        }        return $this->_frontController;    }    /**     * Get layout object     *     * @return Zend_Layout     */    public function getLayoutInstance()    {        if (null === $this->_layout) {            /**             * @see Zend_Layout             */            require_once 'Zend/Layout.php';            if (null === ($this->_layout = Zend_Layout::getMvcInstance())) {                $this->_layout = new Zend_Layout();            }        }        return $this->_layout;    }    /**     * Set layout object     *     * @param  Zend_Layout $layout     * @return Zend_Layout_Controller_Action_Helper_Layout     */    public function setLayoutInstance(Zend_Layout $layout)    {        $this->_layout = $layout;        return $this;    }    /**     * Mark Action Controller (according to this plugin) as Running successfully     *     * @return Zend_Layout_Controller_Action_Helper_Layout     */    public function postDispatch()    {        $this->_isActionControllerSuccessful = true;        return $this;    }    /**     * Did the previous action successfully complete?     *     * @return bool     */    public function isActionControllerSuccessful()    {        return $this->_isActionControllerSuccessful;    }    /**     * Strategy pattern; call object as method     *     * Returns layout object     *     * @return Zend_Layout     */    public function direct()    {        return $this->getLayoutInstance();    }    /**     * Proxy method calls to layout object     *     * @param  string $method     * @param  array $args     * @return mixed     */    public function __call($method, $args)    {        $layout = $this->getLayoutInstance();        if (method_exists($layout, $method)) {            return call_user_func_array(array($layout, $method), $args);        }        require_once 'Zend/Layout/Exception.php';        throw new Zend_Layout_Exception(sprintf("Invalid method '%s' called on layout action helper", $method));    }}

<?php/** Zend_Controller_Plugin_Abstract */require_once 'Zend/Controller/Plugin/Abstract.php';/** * Render layouts * * @uses       Zend_Controller_Plugin_Abstract * @category   Zend * @package    Zend_Controller * @subpackage Plugins * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License * @version    $Id: Layout.php 23775 2011-03-01 17:25:24Z ralph $ */class Zend_Layout_Controller_Plugin_Layout extends Zend_Controller_Plugin_Abstract{    protected $_layoutActionHelper = null;    /**     * @var Zend_Layout     */    protected $_layout;    /**     * Constructor     *     * @param  Zend_Layout $layout     * @return void     */    public function __construct(Zend_Layout $layout = null)    {        if (null !== $layout) {            $this->setLayout($layout);        }    }    /**     * Retrieve layout object     *     * @return Zend_Layout     */    public function getLayout()    {        return $this->_layout;    }    /**     * Set layout object     *     * @param  Zend_Layout $layout     * @return Zend_Layout_Controller_Plugin_Layout     */    public function setLayout(Zend_Layout $layout)    {        $this->_layout = $layout;        return $this;    }    /**     * Set layout action helper     *     * @param  Zend_Layout_Controller_Action_Helper_Layout $layoutActionHelper     * @return Zend_Layout_Controller_Plugin_Layout     */    public function setLayoutActionHelper(Zend_Layout_Controller_Action_Helper_Layout $layoutActionHelper)    {        $this->_layoutActionHelper = $layoutActionHelper;        return $this;    }    /**     * Retrieve layout action helper     *     * @return Zend_Layout_Controller_Action_Helper_Layout     */    public function getLayoutActionHelper()    {        return $this->_layoutActionHelper;    }    /**     * postDispatch() plugin hook -- render layout     *     * @param  Zend_Controller_Request_Abstract $request     * @return void     */    public function postDispatch(Zend_Controller_Request_Abstract $request)    {        $layout = $this->getLayout();        $helper = $this->getLayoutActionHelper();        // Return early if forward detected        if (!$request->isDispatched()            || $this->getResponse()->isRedirect()            || ($layout->getMvcSuccessfulActionOnly()                && (!empty($helper) && !$helper->isActionControllerSuccessful())))        {            return;        }        // Return early if layout has been disabled        if (!$layout->isEnabled()) {            return;        }        $response   = $this->getResponse();        $content    = $response->getBody(true);        $contentKey = $layout->getContentKey();        if (isset($content['default'])) {            $content[$contentKey] = $content['default'];        }        if ('default' != $contentKey) {            unset($content['default']);        }        $layout->assign($content);        $fullContent = null;        $obStartLevel = ob_get_level();        try {            $fullContent = $layout->render();            $response->setBody($fullContent);        } catch (Exception $e) {            while (ob_get_level() > $obStartLevel) {                $fullContent .= ob_get_clean();            }            $request->setParam('layoutFullContent', $fullContent);            $request->setParam('layoutContent', $layout->content);            $response->setBody(null);            throw $e;        }    }}

<?php/** Zend_View_Helper_Abstract.php */require_once 'Zend/View/Helper/Abstract.php';/** * View helper for retrieving layout object * * @package    Zend_View * @subpackage Helper * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License */class Zend_View_Helper_Layout extends Zend_View_Helper_Abstract{    /** @var Zend_Layout */    protected $_layout;    /**     * Get layout object     *     * @return Zend_Layout     */    public function getLayout()    {        if (null === $this->_layout) {            require_once 'Zend/Layout.php';            $this->_layout = Zend_Layout::getMvcInstance();            if (null === $this->_layout) {                // Implicitly creates layout object                $this->_layout = new Zend_Layout();            }        }        return $this->_layout;    }    /**     * Set layout object     *     * @param  Zend_Layout $layout     * @return Zend_Layout_Controller_Action_Helper_Layout     */    public function setLayout(Zend_Layout $layout)    {        $this->_layout = $layout;        return $this;    }    /**     * Return layout object     *     * Usage: $this->layout()->setLayout('alternate');     *     * @return Zend_Layout     */    public function layout()    {        return $this->getLayout();    }}

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