feat(ui): implement new ui system

game/ui/base/focus.go

@@ -0,0 +1,26 @@
+package base
+
+// WithFocus is a base component that implements the Focusable interface
+type WithFocus struct {
+	focus bool
+}
+
+// SetFocus - Set the focus value on this component
+func (f *WithFocus) SetFocus(value bool) {
+	f.focus = value
+}
+
+// Focus - focus this component, syntactic sugar for f.SetFocus(true)
+func (f *WithFocus) Focus() {
+	f.SetFocus(true)
+}
+
+// Unfocus - unfocus this component, syntactic sugar for f.SetFocus(false)
+func (f *WithFocus) Unfocus() {
+	f.SetFocus(false)
+}
+
+// HasFocus - Returns true if this component has focus.
+func (f WithFocus) HasFocus() bool {
+	return f.focus
+}