| /* |
| * Copyright (C) 2021 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.providers.media.photopicker.espresso; |
| |
| import androidx.test.core.app.ActivityScenario; |
| import androidx.test.espresso.IdlingRegistry; |
| import androidx.test.espresso.IdlingResource; |
| import androidx.test.ext.junit.rules.ActivityScenarioRule; |
| import androidx.viewpager2.widget.ViewPager2; |
| |
| /** |
| * An {@link IdlingResource} waiting for the {@link ViewPager2} swipe to enter |
| * {@link ViewPager2#SCROLL_STATE_IDLE} state. |
| */ |
| public class ViewPager2IdlingResource implements IdlingResource, AutoCloseable { |
| private final ViewPager2 mViewPager; |
| private ResourceCallback mResourceCallback; |
| |
| public ViewPager2IdlingResource(ViewPager2 viewPager) { |
| mViewPager = viewPager; |
| viewPager.registerOnPageChangeCallback(new IdleStateListener()); |
| } |
| |
| @Override |
| public String getName() { |
| return ViewPager2IdlingResource.class.getSimpleName(); |
| } |
| |
| @Override |
| public boolean isIdleNow() { |
| return mViewPager.getScrollState() == ViewPager2.SCROLL_STATE_IDLE; |
| } |
| |
| @Override |
| public void registerIdleTransitionCallback(ResourceCallback callback) { |
| mResourceCallback = callback; |
| } |
| |
| @Override |
| public void close() throws Exception { |
| IdlingRegistry.getInstance().unregister(this); |
| } |
| |
| private final class IdleStateListener extends ViewPager2.OnPageChangeCallback { |
| @Override |
| public void onPageScrollStateChanged(int state) { |
| if (state == ViewPager2.SCROLL_STATE_IDLE && mResourceCallback != null) { |
| mResourceCallback.onTransitionToIdle(); |
| } |
| } |
| } |
| |
| /** |
| * @return {@link ViewPager2IdlingResource} that is registered to the activity related to the |
| * given {@link ActivityScenarioRule} and the resource ID of the ViewPager2. |
| */ |
| public static <T extends PhotoPickerTestActivity> ViewPager2IdlingResource register( |
| ActivityScenario<T> scenario, int viewPager2Id) { |
| final ViewPager2IdlingResource[] idlingResources = new ViewPager2IdlingResource[1]; |
| scenario.onActivity( |
| (activity -> { |
| idlingResources[0] = |
| new ViewPager2IdlingResource(activity.findViewById(viewPager2Id)); |
| })); |
| IdlingRegistry.getInstance().register(idlingResources[0]); |
| return idlingResources[0]; |
| } |
| } |