Placeful Theming#

For some themed location /foo/bar, you want “bar” and everything below it to look different than “foo”.

I had to do a bit of placeful theming lately and I thought I would share the techniques I used (thanks davisagli, jonbaldievieso, vedawms). Let’s say you have a Plone 3 site, and for some location /foo/bar/baz, you want ‘baz’ and everything below it to look different. I made this change through the web because I was in a hurry, but the same can be done in filesystem code.

The steps are:

1. Override getSectionFromURL (navigate to portal_skins/plone_scripts/getSectionFromURL and customize)#

Normally, this bit of code returns the section id for whatever section you are in. So if your site has three top level folders A, B, C, getSectionURL returns section-A when you are inside of A, section-B when you are inside of B, and so on. However, when you are inside of a sub-section, e.g. /A/news-items-folder, it *still* returns the section id, in this case section-A. The override makes getSectionURL return the sub-section, e.g. /A/news-items-folder, or /foo/bar/baz.

# Courtesy of jonb at
# getSectionFromURLcontentPath = context.portal_url.getRelativeContentPath(context)
if not contentPath:
    return None
    s = ''
    sectionId = ''
    for pathItem in contentPath:
        sectionId += pathItem + '-'
        s += 'section-' + sectionId[:-1] + ' '
        return s[:-1]

2. Override plone.logo (navigate to /portal_view_customizations/zope.interface.interface-plone.logo and customize)#

For some reason (good or not, I don’t know) Plone includes an image tag in the html code it uses to generate the Plone logo. This means that it will always output something like:

img src="logo.jpg"

which is a problem if you want to placefully replace the logo because there is no easy way to do it (perhaps you could use some trick to return a different image file with the same file name).

Plone ships with:

<a metal:define-macro="portal_logo" id="portal-logo" accesskey="1" tal:attributes="href view/navigation_root_url" i18n:domain="plone">
    <img src="logo.jpg" alt="" tal:replace="structure view/logo_tag" /></a>

Replace that with:

<div metal:define-macro="portal_logo" id="portal-logo"><a accesskey="1" tal:attributes="href view/navigation_root_url" i18n:domain="plone"></a></div>

3. Add CSS (Navigate to /portal_skins/plone_styles/ploneCustom.css and customize)#

Next, add in some CSS to make use of the previous two changes:

body.section-foo-bar-baz { background-image: url(gradient.png);}.section-foo-bar-baz
#portal-globalnav li a { border: 0px; background: #0066CC; color: white; font-size: 110%; font-face: bold;}.section-foo-bar-baz
#portal-globalnav { background: #0066CC; padding: 0.25em;}.section-foo-bar-baz
#portal-breadcrumbs,.section-foo-bar-baz #portal-personaltools { background: white;}.section-foo-bar-baz
#portal-top { background: white;}.section-foo-bar-baz
#portal-logo { margin: 1em; background-image: url(ama_logo.gif); background-repeat: no-repeat;}.section-foo-bar-baz
#visual-portal-wrapper { background: white; margin: auto; width: 883px; position: relative;}.section-foo-bar-baz
body { background-image: url(gradient.png); background-repeat: repeat;}
#portal-logo { margin: 1em; background-image: url(logo.jpg); background-repeat: no-repeat;}
#portal-logo a { display: block; width: 650px; height: 80px;}

I hope this helps someone get started with placeful theming.