ES-DE/THEMES.md

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Themes
======
EmulationStation allows each system to have its own "theme." A theme is a collection of display settings and images defined in an XML document.
ES will check two places for a theme: first, the system's search directory for theme.xml. Then, if that's not found, $HOME/.emulationstation/es_theme.xml.
Almost all positions, dimensions, etc. work in percentages - that is, they are a decimal between 0 and 1, representing the percentage of the screen on that axis to use.
This ensures that themes look similar at every resolution.
Example
=======
Here's a simple theme that defines some colors and displays a background:
```
<theme>
<listPrimaryColor>0000FF</listPrimaryColor>
<listSecondaryColor>00FF00</listSecondaryColor>
<component>
<type>image</type>
<path>./theme/background.png</path>
<pos>0 0</pos>
<dim>1 1</dim>
<origin>0 0</origin>
</component>
</theme>
```
All themes must be enclosed in a `<theme>` tag.
Components
==========
A theme is made up of components, which have various types. At the moment, the only type is `image`. Components can be nested for your own organization. Components are rendered in the order they are defined - that means you'll want to define the background first, a header image second, etc.
The "image" component
=====================
Used to display an image.
`<path>` - path to the image file. Most common file types are supported, and . and ~ are properly expanded.
`<pos>` - the position, as two screen percentages, at which to display the image.
`<dim>` - the dimensions, as two screen percentages, that the image will be resized to. Make one axis 0 to keep the aspect ratio.
`<origin>` - the point on the image that `<pos>` defines, as an image percentage. "0.5 0.5", the center of the image, by default.
`<tiled />` - if present, the image is tiled instead of resized. Tiling isn't exact at the moment, but good enough for backgrounds.
Display tags
============
Display tags must be at the root of the <theme> tree - for example, they can't be inside a component tag. They are not required.
`<listPrimaryColor>` - the hex font color to use for games on the GuiGameList.
`<listSecondaryColor>` - the hex font color to use for folders on the GuiGameList.
`<descColor>` - the hex font color to use for the description on the GuiGameList.
`<listSelectorColor>` - the hex color to use for the "selector bar" on the GuiGameList.
`<listLeftAlign />` - if present, the games list names will be left aligned to $infoWidth.
`<hideHeader />` - if present, the system name header won't be displayed (useful for replacing it with an image).
`<hideDividers />` - if present, the divider between games on the detailed GuiGameList won't be displayed.
List of variables
=================
Variables can be used in position and dimension definitions. They can be added, subtracted, multiplied, and divided. Parenthesis are valid. They are a percentage of the screen.
`$headerHeight` - height of the system name header.
`$infoWidth` - where the center of the horizontal divider is drawn.
Bugs
====
Hexidecimal colors might be read in backwards. Woops. I'll get around to fixing this eventually.
-Aloshi
http://www.aloshi.com