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Theme fragments for plone.app.theming

Project description

https://secure.travis-ci.org/datakurre/collective.themefragments.png

Diazo Rules may operate on content that is fetched from somewhere other than the current page being rendered by Plone, by using the href attribute to specify a path of a resource relative to the root of the Plone site:

<!-- Pull in extra navigation from a browser view on the Plone site root -->
<after
    css:theme-children="#leftnav"
    css:content=".navitem"
    href="/@@extra-nav"
    />

The href attribute can be used with any rule apart from <drop /> and <strip />, and can reference any URL, for example to an existing browser view configured for your site. However, it is often desirable to generate some dynamic content specifically for the purpose of constructing a particular theme. In this scenario, you can use fragments.

Fragment templates

Fragments are Zope Page Template files bundled with your theme. You can create them by adding a folder called fragments to your theme resource directory (i.e. the directory containing rules.xml), either through the web or on the filesystem, and creating one or more files with a .pt extension in this directory.

For example, you could create a file fragments/customnav.pt in your theme directory, containing:

<ul id="nav">
  <li tal:repeat="item context/@@folderListing">
    <img tal:replace="structure item/getIcon" />
    <span tal:replace="item/Title" tal:attributes="titile item/Description">Title</span>
  </li>
</ul>

This uses Zope Page Template TAL syntax (the same syntax you might use to create a template for a browser view if you are doing filesystem Python development, say) to generate some markup based on the attributes and helper views available relative to the current context.

The following variables are available to the page template used to build a fragment:

context

The context in which the fragment was looked up. This is usually either the portal root (when using an href with an absolute path, i.e. one starting with a /) or the current content object (when using an href with a relative path).

request

The request used to render the fragment. When using a fragment from the href of a rule, this is a clone of the request used to render the page, but with the path to the fragment view, not the original content object. Note that form parameters from the original request are not available in this request.

portal

The portal root object.

portal_url

The URL to the portal root.

You can learn more about Zope Page Template syntax here.

Fragment methods

Fragment methods are Restricted Python Script files bundled with your themes. Availability of methods is limited to specific fragment by prefixing the method filename with the fragment name. Each script should contain code for a single method and end by returning a value for the template.

For example, you could create a file fragments/customnav.getnav.py in your theme directory, containing:

return [{
    'Title': u'My title',
    'Description': u'My description',
    'getIcon': 'document_icon.png'
}]

And call it in your fragment fragments/customnav.pt like a view method:

<ul id="nav">
  <li tal:repeat="item view/getnav">
    <img tal:replace="structure item/getIcon" />
    <span tal:replace="item/Title" tal:attributes="titile item/Description">Title</span>
  </li>
</ul>

The following variables are available to the fragment method kkkkkkkused to build a fragment:

self

The fragment view, which provides access to self.context, self.request and other available fragment methods similarly to filesystem browser views.

args

List of positional arguments for the method call. Fragment methods do not support Zope PythonScript’s way of defining positional named arguments.

kwargs

Dictionary of keyword arguments for the method call. Fragment methods do not support Zope PythonScript’s way of defining named keyword arguments.

context

The context in which the fragment was looked up. This is provided as tribute to Zope PythonScript.

container

The container for the context which the fragment was looked up. This is provided as tribute to Zope PythonScript.

traverse_subpath

An empty string. This is provided as tribute to Zope PythonScript.

Rendering fragments

The special @@theme-fragment view is used to render fragments. Before using it in your theme, you can test it directly in your browser by going to a URL like:

http://localhost:8080/Plone/@@theme-fragment/customnav

This will cause the fragment in fragments/customnav.pt to be rendered with the Plone site Plone running on localhost:8080 as its context. You can render fragments relative to any content object, by adjusting the URL.

Note: Fragments are only available for the currently active theme. When testing a fragment in the browser in this way, make sure the theme is enabled!

To use a fragment in a theme rule, use the href attribute with either an absolute or relative path. For example:

<replace css:theme="#navlist" css:content="#nav" href="/@@theme-fragment/customnav" />

will replace the element with id navlist in the theme with the element with id nav in the fragment generated by the fragments/customnav.pt template in the theme, rendered with the portal root as its context always (since the href is using an absolute path, i.e. one beginning with a /).

Similarly:

<replace css:theme="#navlist" css:content="#nav" href="@@theme-fragment/customnav" />

will do the same, but using the current content item as its context (i.e. the href is using a relative path).

Fragment security

Fragments, like theme HTML mockup files, are publicly accessible. Anyone with access to the site can construct a URL containing @@theme-fragment/<name> to render a given fragment.

However, the page templates used to build fragments execute in a so-called Restricted Python environment. This means that the are executed as the current user (or Anonymous, if the current user is not logged in). Information (such as content items or their attributes) not accessible to the current user cannot be rendered, and may result in a 403 Forbidden error when rendering the fragment.

Changelog

1.1.0 (2016-12-12)

  • Refactor fragment tile source into fragment tile vocabulary to fix compatibility issue with Plone 5.1 [datakurre]

1.0.1 (2016-02-21)

  • Fix issue where plone:tile -directive was not properly included [datakurre]

1.0.0 (2015-09-16)

  • Add fragment tile for plone.app.mosaic [datakurre]

0.10.0 (2015-04-03)

  • Add support for restricted python view methods (with fragments/templatename.methodname.py) [datakurre]

0.9.0 (2015-04-01)

  • First release based on Martin Aspeli’s rejected pull for plone.app.theming.

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