1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.tv.settings.connectivity.util; 18 19 20 import androidx.fragment.app.Fragment; 21 22 /** 23 * State used by {@link StateMachine}. 24 */ 25 public interface State { 26 27 /** 28 * Process when moving forward. 29 */ processForward()30 void processForward(); 31 32 /** 33 * Process when moving backward. 34 */ processBackward()35 void processBackward(); 36 37 /** 38 * Listener for sending notification about state completion. 39 */ 40 interface StateCompleteListener { onComplete(@tateMachine.Event int event)41 void onComplete(@StateMachine.Event int event); 42 } 43 44 /** 45 * Listener for sending notification about fragment change. 46 */ 47 interface FragmentChangeListener { onFragmentChange(Fragment newFragment, boolean movingForward)48 void onFragmentChange(Fragment newFragment, boolean movingForward); 49 } 50 51 /** 52 * @return the corresponding fragment for current state. If there is no corresponding fragment, 53 * return null. 54 */ getFragment()55 Fragment getFragment(); 56 } 57