cone.tile 0.9.2

Provide parts of a web application as tiles.

Register tiles

A tile is registered similar to a pyramid view. Registration is done with the cone.tile.registerTile function:

>>> from cone.tile import registerTile
>>> registerTile('a_tile',
...              'package:browser/templates/a_tile.pt',
...              permission='view')

or the cone.tile.tile decorator on classes:

>>> from cone.tile import tile, Tile
>>> @tile('b_tile', 'package:browser/templates/b_tile.pt',
...       permission='view', strict=False)
... class BTile(Tile):
...     pass

Both, decorator and register function accept following arguments:

name

Identifier of the tile (for later lookup).

path

Either relative path to the template or absolute path or path prefixed by the absolute package name delimeted by ':'. If path is used attribute is ignored.

attribute

Attribute on the given _class to be used to render the tile. Defaults to render.

interface

Interface or class of the pyramid model the tile is registered for.

class_

Class to be used to render the tile. usally cone.tile.Tile or a subclass of. Promises to implement cone.tile.ITile. When the tile decorator is used, the decorated class is expected as tile implementation.

permission

Enables security checking for this tile. Defaults to view. If set to None security checks are disabled.

strict

Wether to raise Forbidden or not if rendering is not permitted. Defaults to True. If set to False the exception is consumed and an empty unicode string is returned.

Tiles can be overwritten later while application initialization by just registering it again. This is useful for application theming and customization.

Rendering tiles

Tile rendering with the render_tile function:

>>> from cone.tile import render_tile
>>> rendered = render_tile(model, request, name)

Inside templates which are bound to the tile, more tiles can be rendered on current model and request via tile:

>>> <tal:sometile replace="structure tile('tilename')"

The Tile

A tile is similar to what's known in the zope world as content provider.

Before rendering of the tile is done, the prepare function is called which can be used to load data or whatever.

Further, the show flag is considered (which might have been set in the prepare function) and rendering is skipped if it evaluates to False.

More on rendering

There are helper functions for rendering which pass the tile renderer to templates for invoking child tiles and consider redirections.

The tile class provides a redirect function, which expects either a string containing a URL or a webob.exc.HTTPFound instance. This causes rendering of remaining tiles to be skipped and request.environ['redirect'] to be set.

cone.tile.render_template

Render template. Passes tile renderer to template. Considers redirection. Returns empty string if redirection found.

cone.tile.render_template_to_response

Render template to response. Passes tile renderer to template. Considers redirection. Returns HTTPFound instance if redirection found, otherwise rendered response.

cone.tile.render_to_response

Renders some result to the response considering redirection. Returns HTTPFound instance if redirection found, otherwise rendered response.