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 17package androidx.navigation.testing; 18 19import android.os.Bundle; 20import android.support.annotation.NonNull; 21import android.support.annotation.Nullable; 22import android.support.v4.util.Pair; 23 24import androidx.navigation.NavDestination; 25import androidx.navigation.NavOptions; 26import androidx.navigation.Navigator; 27 28import java.util.ArrayDeque; 29 30/** 31 * A simple Navigator that doesn't actually navigate anywhere, but does dispatch correctly 32 */ 33@Navigator.Name("test") 34public class TestNavigator extends Navigator<TestNavigator.Destination> { 35 36 public final ArrayDeque<Pair<Destination, Bundle>> mBackStack = new ArrayDeque<>(); 37 38 @NonNull 39 @Override 40 public Destination createDestination() { 41 return new Destination(this); 42 } 43 44 @Override 45 public void navigate(@NonNull Destination destination, @Nullable Bundle args, 46 @Nullable NavOptions navOptions) { 47 if (navOptions != null && navOptions.shouldLaunchSingleTop() && !mBackStack.isEmpty() 48 && mBackStack.peekLast().first.getId() == destination.getId()) { 49 mBackStack.pop(); 50 mBackStack.add(new Pair<>(destination, args)); 51 dispatchOnNavigatorNavigated(destination.getId(), BACK_STACK_UNCHANGED); 52 } else { 53 mBackStack.add(new Pair<>(destination, args)); 54 dispatchOnNavigatorNavigated(destination.getId(), BACK_STACK_DESTINATION_ADDED); 55 } 56 } 57 58 @Override 59 public boolean popBackStack() { 60 boolean popped = mBackStack.pollLast() != null; 61 if (popped) { 62 dispatchOnNavigatorNavigated(mBackStack.isEmpty() 63 ? 0 64 : mBackStack.peekLast().first.getId(), 65 BACK_STACK_DESTINATION_POPPED); 66 } 67 return popped; 68 } 69 70 /** 71 * A simple Test destination 72 */ 73 public static class Destination extends NavDestination { 74 /** 75 * NavDestinations should be created via {@link Navigator#createDestination}. 76 */ 77 Destination(@NonNull Navigator<? extends NavDestination> navigator) { 78 super(navigator); 79 } 80 } 81} 82