1 /* 2 * Copyright 2018 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 androidx.recyclerview.widget; 18 19 import static androidx.recyclerview.widget.LinearLayoutManager.HORIZONTAL; 20 21 import static org.junit.Assert.assertEquals; 22 23 import android.support.test.filters.MediumTest; 24 import android.widget.FrameLayout; 25 26 import org.junit.Test; 27 import org.junit.runner.RunWith; 28 import org.junit.runners.Parameterized; 29 30 import java.util.ArrayList; 31 import java.util.List; 32 33 @RunWith(Parameterized.class) 34 public class LinearLayoutManagerResizeTest extends BaseLinearLayoutManagerTest { 35 36 final Config mConfig; 37 38 public LinearLayoutManagerResizeTest(Config config) { 39 mConfig = config; 40 } 41 42 @Parameterized.Parameters(name = "{0}") 43 public static List<Config> testResize() throws Throwable { 44 List<Config> configs = new ArrayList<>(); 45 for (Config config : addConfigVariation(createBaseVariations(), "mItemCount", 5 46 , Config.DEFAULT_ITEM_COUNT)) { 47 configs.add(config); 48 } 49 return configs; 50 } 51 52 @MediumTest 53 @Test 54 public void resize() throws Throwable { 55 final Config config = (Config) mConfig.clone(); 56 final FrameLayout container = getRecyclerViewContainer(); 57 mActivityRule.runOnUiThread(new Runnable() { 58 @Override 59 public void run() { 60 container.setPadding(0, 0, 0, 0); 61 } 62 }); 63 64 setupByConfig(config, true); 65 int lastVisibleItemPosition = mLayoutManager.findLastVisibleItemPosition(); 66 int firstVisibleItemPosition = mLayoutManager.findFirstVisibleItemPosition(); 67 int lastCompletelyVisibleItemPosition = mLayoutManager 68 .findLastCompletelyVisibleItemPosition(); 69 int firstCompletelyVisibleItemPosition = mLayoutManager 70 .findFirstCompletelyVisibleItemPosition(); 71 mLayoutManager.expectLayouts(1); 72 // resize the recycler view to half 73 mActivityRule.runOnUiThread(new Runnable() { 74 @Override 75 public void run() { 76 if (config.mOrientation == HORIZONTAL) { 77 container.setPadding(0, 0, container.getWidth() / 2, 0); 78 } else { 79 container.setPadding(0, 0, 0, container.getHeight() / 2); 80 } 81 } 82 }); 83 mLayoutManager.waitForLayout(1); 84 if (config.mStackFromEnd) { 85 assertEquals("[" + config + "]: last visible position should not change.", 86 lastVisibleItemPosition, mLayoutManager.findLastVisibleItemPosition()); 87 assertEquals("[" + config + "]: last completely visible position should not change", 88 lastCompletelyVisibleItemPosition, 89 mLayoutManager.findLastCompletelyVisibleItemPosition()); 90 } else { 91 assertEquals("[" + config + "]: first visible position should not change.", 92 firstVisibleItemPosition, mLayoutManager.findFirstVisibleItemPosition()); 93 assertEquals("[" + config + "]: first completely visible position should not change", 94 firstCompletelyVisibleItemPosition, 95 mLayoutManager.findFirstCompletelyVisibleItemPosition()); 96 } 97 } 98 } 99
