1/* 2 * Copyright (C) 2015 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 android.support.v7.widget; 18 19import org.junit.After; 20import org.junit.Before; 21import org.junit.Test; 22import org.junit.runner.RunWith; 23import org.junit.runners.Parameterized; 24 25import android.support.test.InstrumentationRegistry; 26import android.test.suitebuilder.annotation.MediumTest; 27import android.widget.FrameLayout; 28 29import java.util.ArrayList; 30import java.util.List; 31 32import static android.support.v7.widget.LinearLayoutManager.HORIZONTAL; 33import static org.junit.Assert.*; 34 35@RunWith(Parameterized.class) 36public class LinearLayoutManagerResizeTest extends BaseLinearLayoutManagerTest { 37 38 final Config mConfig; 39 40 public LinearLayoutManagerResizeTest(Config config) { 41 mConfig = config; 42 } 43 44 @Parameterized.Parameters(name = "{0}") 45 public static List<Config> testResize() throws Throwable { 46 List<Config> configs = new ArrayList<>(); 47 for (Config config : addConfigVariation(createBaseVariations(), "mItemCount", 5 48 , Config.DEFAULT_ITEM_COUNT)) { 49 configs.add(config); 50 } 51 return configs; 52 } 53 54 @MediumTest 55 @Test 56 public void resize() throws Throwable { 57 final Config config = (Config) mConfig.clone(); 58 final FrameLayout container = getRecyclerViewContainer(); 59 runTestOnUiThread(new Runnable() { 60 @Override 61 public void run() { 62 container.setPadding(0, 0, 0, 0); 63 } 64 }); 65 66 setupByConfig(config, true); 67 int lastVisibleItemPosition = mLayoutManager.findLastVisibleItemPosition(); 68 int firstVisibleItemPosition = mLayoutManager.findFirstVisibleItemPosition(); 69 int lastCompletelyVisibleItemPosition = mLayoutManager 70 .findLastCompletelyVisibleItemPosition(); 71 int firstCompletelyVisibleItemPosition = mLayoutManager 72 .findFirstCompletelyVisibleItemPosition(); 73 mLayoutManager.expectLayouts(1); 74 // resize the recycler view to half 75 runTestOnUiThread(new Runnable() { 76 @Override 77 public void run() { 78 if (config.mOrientation == HORIZONTAL) { 79 container.setPadding(0, 0, container.getWidth() / 2, 0); 80 } else { 81 container.setPadding(0, 0, 0, container.getWidth() / 2); 82 } 83 } 84 }); 85 mLayoutManager.waitForLayout(1); 86 if (config.mStackFromEnd) { 87 assertEquals("[" + config + "]: last visible position should not change.", 88 lastVisibleItemPosition, mLayoutManager.findLastVisibleItemPosition()); 89 assertEquals("[" + config + "]: last completely visible position should not change", 90 lastCompletelyVisibleItemPosition, 91 mLayoutManager.findLastCompletelyVisibleItemPosition()); 92 } else { 93 assertEquals("[" + config + "]: first visible position should not change.", 94 firstVisibleItemPosition, mLayoutManager.findFirstVisibleItemPosition()); 95 assertEquals("[" + config + "]: last completely visible position should not change", 96 firstCompletelyVisibleItemPosition, 97 mLayoutManager.findFirstCompletelyVisibleItemPosition()); 98 } 99 } 100} 101