With the arrival of Drupal 6, sub-theming really came to the forefront of theme design. While previously many people copied themes and then re-worked them to achieve their goals, that process became less attractive as sub-themes came into favor. This chapter focuses on sub-theming and how it should be used to customize an existing theme.
For the purpose of illustrating the examples in this chapter, we'll be using the Bartik theme, which is included in the default Drupal 7 package. Among the topics we will cover:
Selecting a base theme
Creating a sub-theme
Customizing your sub-theme
We'll start by looking at how to set up a workspace for Drupal theming.
Before you get too far into attempting to modify your theme files, you should put some thought into your tools. There are several software applications that can make your work modifying themes more efficient. Though no specific tools are required to work with Drupal themes, you could...