EEA Depiction

Introduction

EEA Depiction (formerly valentine.imagescales) is a generic system for creating thumbnails/image representations for content types, both those provided by Plone, and custom ones.

At the moment this system is implemented and tested only on Archetypes content types, however this system could be adapted in a later version to work also for dexterity content types.

To make it work for a content type, three adapters need to be provided:

ImageView that retrieves an image in the desired scale.
ImageTag that returns the HTML tag for the image
ImageLink that returns the HTML link to the image.

Upgrade notes

As of eea.depiction 5.2 we customize the following resources in order to display any items in thumbnail listings:

atctListAlbum.py - which is responsible for displaying items in atct_album_view.pt
thumbnail_view.pt - which is the browser template responsible for thumbnail listing for the plone.app.collection package

Contents

Introduction
Upgrade notes
Installation
- zc.buildout
How to specify fallback preview images
Dependencies
Source code
Copyright and license
Funding and project management

Installation

zc.buildout

If you are using zc.buildout and the plone.recipe.zope2instance recipe to manage your project, you can do this:

Update your buildout.cfg file:
- Add eea.depiction to the list of eggs to install
- Tell the plone.recipe.zope2instance recipe to install a ZCML slug
```
[instance]
...
eggs =
  ...
  eea.depiction

zcml =
  ...
  eea.depiction-overrides
  eea.depiction
```
Re-run buildout, e.g. with:
```
$ ./bin/buildout
```

You can skip the ZCML slug if you are going to explicitly include the package from another package's configure.zcml file.

How to specify fallback preview images

eea.depiction 0.3 introduces the concept of fallback images when the regular image traversal fails. The logic works like this:

Look for an image returned by the contexts 'imgview' adapter
If the imgview crashes, isn't found or can not locate/generate an image, we continue by checking if there's an image specified for any of the contexts interfaces.
If there's no fallback image, we look for an image for the context portal type, e.g. article, news-item, document. This should be placed in the 'portal_depiction' utility (Site Setup > Depiction Library)
Uses the generic content type image, i.e. portal_depiction/generic

Thus:

To map a fallback image to a portal type, place it in this folder and name it after the portal type.
To map a fallback image to an interface just add a named-utility for IDepictionVocabulary (see eea.depiction.vocabularies)

Dependencies

EEA Depiction has the following dependencies:

Plone 4+
Pillow

This package also supports p4a.video. Thus the following dependencies are optional:

p4a.video

[instance]
...
eggs =
  ...
  eea.depiction [full]

Source code

Latest source code (Plone 4 compatible):

The eea.depiction (the Original Code) is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

More details under docs/License.txt