Upcoming Blackberry 10 release will have full theme support. According to the API Documentation there are Brigth and Dark themes:
The default theme is Bright. To change the application theme to Dark specify the following configuration value in the application`s bar-descriptor.xml file:
<env var="CASCADES_THEME" value="dark"/>
or previously
<cascadesTheme>dark</cascadesTheme>
If You have, for example, a background image for each of the available themes - "asset:///images/bright/background.png" and "asset:///images/dark/background.png" - You can easily manage it by adding a globally available property:
import bb.cascades 1.0
Page {
id: mainPage;
// this property will contain string representation of the current application theme.
property string theme: themeStyleToString(Application.themeSupport.theme.colorTheme.style);
Container {
ImageView {
imageSource: "asset:///images/" + mainPage.theme + "/background.png"
}
}
function themeStyleToString(style) {
switch(style) {
case VisualStyle.Bright: return "bright"
case VisualStyle.Dark: return "dark"
}
// will use dark as default in case of unknown
return "dark"
}
}
Unfortunately, right now I know only one way to change the application theme - via bar-descriptor.xml.