This project shows how to support both widget styling through the requiring controller and theming until ALOY-378 is resolved.

Clone or download the repo, run it and you'll see it in action.

Just add these lines to your widget controller:

var args = arguments[0] || {};

if (args.styles) {
	_.each(args.styles, function(value,property) {
		if (typeof value === 'object') {
			$[property].applyProperties(value);
			delete args.styles[property];
		}
	});
	if (_.size(args.styles) > 0) {
		$.getView().applyProperties(args.styles);
	}
}

And pass any styling to your widget like this, either in the requiring controller's TSS or in a TSS file placed in a theme-folder using the controller's name.

"#myWidget": {
	
	styles: {
		backgroundColor: "#0000FF",
		
		childLabel: {
			color: "#00FFFF"
		}
	}
}