tomo/theme/theme.go

package theme

import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/event"

// Role describes the role of an object.
type Role struct {
	// Package is an optional namespace field. If specified, it should be
	// the package name or module name the object is from.
	Package string
	
	// Object specifies what type of object it is. For example:
	//   - TextInput
	//   - Table
	//   - Label
	//   - Dial
	// This should correspond directly to the type name of the object.
	Object string
}

// R is shorthand for creating a Role structure.
func R (pack, object string) Role {
	return Role { Package: pack, Object: object }
} 

// Theme is an object that can apply a visual style to different objects.
type Theme interface {
	// Apply applies the theme to the given object, according to the given
	// role. This may register event listeners with the given object;
	// closing the returned cookie will remove them.
	Apply (tomo.Object, Role) event.Cookie
}

var current Theme

// SetTheme sets the theme.
func SetTheme (theme Theme) {
	current = theme
}

// Apply applies the current theme to the given object, according to the given
// role. This may register event listeners with the given object; closing the
// returned cookie will remove them.
func Apply (object tomo.Object, role Role) event.Cookie {
	return current.Apply(object, role)
}