YII 主题

heming是一个在Web应用程序里定制网页外观的系统方式。通过采用一个新的主题，网页应用程序的整体外观可以立即和戏剧性的改变。

在Yii，每个主题由一个目录代表，包含view文件，layout文件和相关的资源文件，如图片， CSS文件， JavaScript文件等。主题的名字就是他的目录名字。全部主题都放在在同一目录WebRoot/themes下 。在任何时候，只有一个主题可以被激活。

提示：默认的主题根目录WebRoot/themes可被配置成其他的。只需要配置themeManager应用部件的属性basePath和baseUrl为你所要的值。

要激活一个主题，设置Web应用程序的属性theme为你所要的名字。可以在application configuration中配置或者在执行过程中在控制器的动作里面修改。

注：主题名称是区分大小写的。如果您尝试启动一个不存在的主题， yii: :app()->theme将返回null 。

主题目录里面内容的组织方式和application base path目录下的组织方式一样。例如，所有的view文件必须位于views下 ，布局view文件在views/layouts下 ，和系统view文件在views/system下。例如，如果我们要替换PostController的create view文件为classic主题下，我们将保存新的view文件为WebRoot/themes/classic/views/post/create.php。

对于在module里面的控制器view文件，相应主题view文件将被放在views目录下。例如，如果上述的PostController是在一个命名为forum的模块里 ，我们应该保存create view 文件为WebRoot/themes/classic/views/forum/post/create.php 。如果 forum模块嵌套在另一个名为support模块里 ，那么view文件应为WebRoot/themes/classic/views/support/forum/post/create.php 。

注：由于views目录可能包含安全敏感数据，应当配置以防止被网络用户访问。

当我们调用render或renderPartial显示视图，相应的view文件以及布局文件将在当前激活的主题里寻找。如果发现，这些文件将被render渲染。否则，就后退到viewPath和layoutPath 所指定的预设位置寻找。

baseurl属性，我们就可以为此图像文件生成如下url，

yii">

提示：在一个主题的视图，我们经常需要链接其他主题资源文件。例如，我们可能要显示一个在主题下images目录里的图像文件。使用当前激活主题的baseurl属性，我们就可以为此图像文件生成如下url，

yii: :app()->theme->baseUrl . '/images/FileName.gif'

Below is an example of directory organization for an application with two themes basic and fancy.

WebRoot/
    assets
    protected/
        .htaccess
        components/
        controllers/
        models/
        views/
            layouts/
                main.php
            site/
                index.php
    themes/
        basic/
            views/
                .htaccess
                layouts/
                    main.php
                site/
                    index.php
        fancy/
            views/
                .htaccess
                layouts/
                    main.php
                site/
                    index.php

In the application configuration, if we configure

return array(
    'theme'=>'basic',
    ......
);

then the basic theme will be in effect, which means the application's layout will use the one under the directorythemes/basic/views/layouts, and the site's index view will use the one underthemes/basic/views/site. In case a view file is not found in the theme, it will fall back to the one under theprotected/views directory.

1. Theming Widgets  主题挂件

Starting from version 1.1.5, views used by a widget can also be themed. In particular, when we callCWidget::render() to render a widget view, Yii will attempt to search under the theme folder as well as the widget view folder for the desired view file.

To theme the view xyz for a widget whose class name is Foo, we should first create a folder named Foo (same as the widget class name) under the currently active theme's view folder. If the widget class is namespaced (available in PHP 5.3.0 or above), such as \app\widgets\Foo, we should create a folder namedapp_widgets_Foo. That is, we replace the namespace separators with the underscore characters.

创建一个Foo挂件的theme view xyz，我们应该在theme's view文件夹下创建Foo文件夹。

We then create a view file named xyz.php under the newly created folder. To this end, we should have a filethemes/basic/views/Foo/xyz.php, which will be used by the widget to replace its original view, if the currently active theme is basic.

2. Customizing Widgets Globally

//this feature has been available since version 1.1.3.

When using a widget provided by third party or Yii, we often need to customize it for specific needs. For example, we may want to change the value of CLinkPager::maxButtonCount from 10 (default) to 5. We can accomplish this by passing the initial property values when calling CBaseController::widget to create a widget. However, it becomes troublesome to do so if we have to repeat the same customization in every place we useCLinkPager.

$this->widget('CLinkPager', array(
    'pages'=>$pagination,
    'maxButtonCount'=>5,
    'cssFile'=>false,
));

Using the global widget customization feature, we only need to specify these initial values in a single place, i.e., the application configuration. This makes the customization of widgets more manageable.

To use the global widget customization feature, we need to configure the widgetFactory as follows:

return array(
    'components'=>array(
        'widgetFactory'=>array(
            'widgets'=>array(
                'CLinkPager'=>array(
                    'maxButtonCount'=>5,
                    'cssFile'=>false,
                ),
                'CJuiDatePicker'=>array(
                    'language'=>'ru',
                ),
            ),
        ),
    ),
);

In the above, we specify the global widget customization for both CLinkPager and CJuiDatePicker widgets by configuring the CWidgetFactory::widgets property. Note that the global customization for each widget is represented as a key-value pair in the array, where the key refers to the wiget class name while the value specifies the initial property value array.

Now, whenever we create a CLinkPager widget in a view, the above property values will be assigned to the widget, and we only need to write the following code in the view to create the widget:

$this->widget('CLinkPager', array(
    'pages'=>$pagination,
));

We can still override the initial property values when necessary. For example, if in some view we want to setmaxButtonCount to be 2, we can do the following:

$this->widget('CLinkPager', array(
    'pages'=>$pagination,
    'maxButtonCount'=>2,
));
这个对pageSize无效。
参考：http://www.yiiframework.com/forum/index.php/topic/11510-cgridview-how-to-set-default-page-size/
 
http://danaluther.blogspot.com/2012/02/leveraging-widgets-widget-factory-and.html