Themes

Themes are a way of customising the appearance of widgets and dialogs.

Themes control:

• Text and background colours for dialogs, widgets, and text
• Sets of colours to use for button states
• Padding between elements, and standard sizing for buttons
• Icon textures

Themed

Objects that accept a theme, including dialogs and themed widgets, implement the Themed interface. This interface has one abstract property, theme, defining its theme.

Delegation is your friend here! If you're creating a custom widget, accept Themed (for a dialog) and delegate to that:

class MyFunnyWidget(theme: Themed): CompoundWidget(...), Themed by theme

Themes themselves implement Themed too, so if you don't have your own theme, you can delegate to DefaultTheme:

class BoringUnthemedDialog : Dialog(), Themed by DefaultTheme

or Theme.Active (this is so that users could change the default theme to something else):

class SlightlyLessBoringDialog : Dialog(), Themed by Theme.Active