Theming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
andfancy
.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.phpIn 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 ¶
Starting from version 1.1.5, views used by a widget can also be themed. In particular, when we call CWidget::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 isFoo
, we should first create a folder namedFoo
(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.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 isbasic
.2. Customizing Widgets Globally ¶
Note: 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 use CLinkPager.
$this->widget('CLinkPager', array( 'pages'=>$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 set
maxButtonCount
to be 2, we can do the following:$this->widget('CLinkPager', array( 'pages'=>$pagination, 'maxButtonCount'=>2, ));
3. Skin ¶
Note: The skin feature has been available since version 1.1.0.
While using a theme we can quickly change the outlook of views, we can use skins to systematically customize the outlook of the widgets used in the views.
A skin is an array of name-value pairs that can be used to initialize the properties of a widget. A skin belongs to a widget class, and a widget class can have multiple skins identified by their names. For example, we can have a skin for the CLinkPager widget and the skin is named as
classic
.In order to use the skin feature, we first need to modify the application configuration by configuring the CWidgetFactory::enableSkin property to be true for the
widgetFactory
application component:return array( 'components'=>array( 'widgetFactory'=>array( 'enableSkin'=>true, ), ), );
Please note that in versions prior to 1.1.3, you need to use the following configuration to enable widget skinning:
return array( 'components'=>array( 'widgetFactory'=>array( 'class'=>'CWidgetFactory', ), ), );
We then create the needed skins. Skins belonging to the same widget class are stored in a single PHP script file whose name is the widget class name. All these skin files are stored under
protected/views/skins
, by default. If you want to change this to be a different directory, you may configure theskinPath
property of thewidgetFactory
component. As an example, we may create underprotected/views/skins
a file namedCLinkPager.php
whose content is as follows,return array( 'default'=>array( 'nextPageLabel'=>'>>', 'prevPageLabel'=>'<<', ), 'classic'=>array( 'header'=>'', 'maxButtonCount'=>5, ), );In the above, we create two skins for the CLinkPager widget:
default
andclassic
. The former is the skin that will be applied to any CLinkPager widget that we do not explicitly specify itsskin
property, while the latter is the skin to be applied to a CLinkPager widget whoseskin
property is specified asclassic
. For example, in the following view code, the first pager will use thedefault
skin while the second theclassic
skin:$this->widget('CLinkPager'); $this->widget('CLinkPager', array('skin'=>'classic'));If we create a widget with a set of initial property values, they will take precedence and be merged with any applicable skin. For example, the following view code will create a pager whose initial values will be
array('header'=>'', 'maxButtonCount'=>6, 'cssFile'=>false)
, which is the result of merging the initial property values specified in the view and theclassic
skin.$this->widget('CLinkPager', array( 'skin'=>'classic', 'maxButtonCount'=>6, 'cssFile'=>false, ));Note that the skin feature does NOT require using themes. However, when a theme is active, Yii will also look for skins under the
skins
directory of the theme's view directory (e.g.WebRoot/themes/classic/views/skins
). In case a skin with the same name exists in both the theme and the main application view directories, the theme skin will take precedence.If a widget is using a skin that does not exist, Yii will still create the widget as usual without any error.
Info: Using skin may degrade the performance because Yii needs to look for the skin file the first time a widget is being created.
Skin is very similar to the global widget customization feature. The main differences are as follows.
- Skin is more related with the customization of presentational property values;
- A widget can have multiple skins;
- Skin is themeable;
- Using skin is more expensive than using global widget customization.
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