Modular styles manager

Notes

Adds a simple API and GUI for packaging and configuring Trac themes.

Configuration

trac.ini

All configuration options go in the [theme] section.

theme : optional, default: "default"

Theme name to use. Name is case-insensitive.

enable_css : optional, default: false

Enable or disable the CSS customizations.

color.* : optional

Stored values for simple CSS overrides. Note that changing this will not take effect until you save them in the admin panel.

Web interface

Theme

Use the arrows to select your theme from the installed options and then click the button to activate it.

Customize

Here you can further customize your theme by changing colors for certain pieces of the UI. The scheme drop down allows you to load pre-configured color schemes. Note that not all themes will support this, or support the same options.

Customize: Advanced

Here you can customize the CSS even further. As mentioned in the file, if you edit this file by hand, you should not use the simple customizer system or you will lose your changes.

Example

To enable the PyDotOrg theme:

[theme]
theme = pydotorg

[components]
themeengine.* = enabled
pydotorgtheme.* = enabled

Creating a theme

Simple way

The easiest way to make a new theme is to inherit from ThemeBase. A basic example theme is as follows:

from trac.core import *

from themeengine.api import ThemeBase

class ExampleTheme(ThemeBase):
    """A example theme."""

    template = htdocs = css = screenshot = True

The name will be inferred from the class name ("Example" in this case) and the docstring will be used as the description. There are several class variables you can set to configure the theme. By default all of these are set to False and so are disabled. If set to True, each option will use a generally sane default. If set to any value other than those, that value will be used directly.

The available options as follows (all are optional):

template : default: $name_theme.html

The filename of the replacement template.

css : default: $name.css

Filename for a stylesheet to include.

htdocs : default: htdocs

Subfolder containing static content.

screenshot : default: htdocs/screenshot.png

Package-relative path to the screenshot file. File should be 640x400 or use the same aspect ratio.

colors :

Specifiers for simple color customization system. This should be an iterable of tuples of the form (name, property, selector). name will be shown in the customization UI for that entry. property will generally be color or background-color. selector should be a CSS selector string to apply the color rule to.

schemes :

Pre-built color schemes. This should be an iterable of tuples of the form (name, color_dict). The color_dict should be a dictionary mapping color name to hex color string (of the form #00AAFF).

Advanced API

For more advanced control you can implement IThemeProvider from themeengine.api. The interface definition is:

class IThemeProvider(Interface):
    """An interface to provide style information."""

    def get_theme_names():
        """Return an iterable of names."""

    def get_template_overrides(name):
        """(Optional) local changes to specific templates

        Return a sequence of tuples (old_html, new_html, function) where

         old_html::
           The name of the template overriden by this theme.
         new_html::
           The name of the template file replacing the former.
         function::
           Optional callback (or None) to add further data . Signature:
                   req::
                       Request object
                   template::
                       The value of `old_html` above
                   data::
                       Template data, may be modified
                   content_type::
                       Reported MIME type

        since 2.2.0
        """

    def get_theme_info(name):
        """Return a dict containing 0 or more of the following pairs:

         description::
           A brief description of the theme.
         template::
           The name of the theme template file.
         css::
           The filename of the CSS file.
         htdocs::
           The folder containing the static content.
         screenshot::
           The name of the screenshot file.
         colors::
           A list of (name, css-property, selector) tuples.
         schemes::
           A list of (name, {color-name: value, ...}) tuples.
        """

Most of these are the same as the simple API above, except description is explicit.

Customizing specific views

Since version 2.2.0 it is possible to customize specific views by implementing (optional) get_template_overrides method. For instance the following sample code will change ticket and wiki views using custom Genshi templates:

class CustomTheme(...):

    #------8<------ Code omitted ------8<------

    def get_template_overrides(self, name):
        """Override ticket and wiki templates using custom templates
        """
        yield ('ticket.html', 'custom_ticket.html', None)
        yield ('wiki.html', 'custom_wiki.html', self._modify_wiki)

    def _modify_wiki(self, req, template, data, content_type):
        data['var'] = 'value'

Notice that, in sample code, new data will added to render wiki pages.

Bugs/Feature Requests

Existing bugs and feature requests for ThemeEnginePlugin are here.

If you have any issues, create a new ticket.

Download and Source

Download the zipped source from here. You can check out ThemeEnginePlugin from here using Subversion, or browse the source with Trac.

Example

To enable:

[components]
themeengine.* = enabled

To specify a theme:

[theme]
theme = <Name>

Recent Changes

[13230] by olemis on 05/24/13 05:39:18

ThemeEnginePlugin : Improve styling in README

[13184] by olemis on 05/21/13 03:38:30

ThemeEnginePlugin [ fixes #11104 ]: Current theme in custom theme admin template defaults to empty dict Error recovery on misconfiguration in ThemeBase?.is_active_theme

refs #11103 - because error on misconfiguration also affects simple theme admin panel refs #10852 - the original ticket introducing is_active_theme API method

[13183] by olemis on 05/21/13 00:56:46

ThemeEnginePlugin [ close #11103 ] : Display theme carousel (admin) even if missing theme name configured in TracIni

[13170] by olemis on 05/19/13 23:11:42

ThemeEnginePlugin [refs #11098] : Fix typos in README - after [13169]

Author/Contributors

Author: coderanger
Maintainer: olemis
Contributors: