     func destroy()
 }
 
+extension FullscreenStateHandler {
+    func enterInFullscreen() { }
+    func exitFullscreen() { }
+    func destroy() { }
+}
+
 struct FullscreenByApp: FullscreenStateHandler {
-
     var core: Core
 
     func set(fullscreen: Bool) {

protocol FullscreenStateHandler {

    var core: Core { get }

    init(core: Core)

            core.trigger(InternalEvent.didExitFullscreen.rawValue)
        }
    }
}

struct FullscreenByPlayer: FullscreenStateHandler {
    var core: Core

    func set(fullscreen: Bool) {
