1/* 2 * Copyright (C) 2016 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 static android.view.View.MeasureSpec.AT_MOST; 20import static android.view.View.MeasureSpec.EXACTLY; 21import static android.view.View.MeasureSpec.makeMeasureSpec; 22 23import static org.hamcrest.CoreMatchers.is; 24import static org.hamcrest.CoreMatchers.notNullValue; 25import static org.hamcrest.MatcherAssert.assertThat; 26 27import android.graphics.Rect; 28import android.support.test.runner.AndroidJUnit4; 29import android.test.suitebuilder.annotation.MediumTest; 30import android.view.View; 31 32import org.junit.Test; 33import org.junit.runner.RunWith; 34 35/** 36 * Tests scroll to position with wrap content to make sure that LayoutManagers can keep track of 37 * the position if layout is called multiple times. 38 */ 39@MediumTest 40@RunWith(AndroidJUnit4.class) 41public class ScrollToPositionWithAutoMeasure extends BaseRecyclerViewInstrumentationTest { 42 @Test 43 public void testLinearLayoutManager() throws Throwable { 44 LinearLayoutManager llm = new LinearLayoutManager(getActivity()); 45 llm.ensureLayoutState(); 46 test(llm, llm.mOrientationHelper); 47 } 48 49 @Test 50 public void testGridLayoutManager() throws Throwable { 51 GridLayoutManager glm = new GridLayoutManager(getActivity(), 3); 52 glm.ensureLayoutState(); 53 test(glm, glm.mOrientationHelper); 54 } 55 56 @Test 57 public void testStaggeredGridLayoutManager() throws Throwable { 58 StaggeredGridLayoutManager sglm = new StaggeredGridLayoutManager(3, 59 StaggeredGridLayoutManager.VERTICAL); 60 test(sglm, sglm.mPrimaryOrientation); 61 } 62 63 public void test(final RecyclerView.LayoutManager llm, 64 final OrientationHelper orientationHelper) throws Throwable { 65 final RecyclerView recyclerView = new RecyclerView(getActivity()); 66 recyclerView.setLayoutManager(llm); 67 recyclerView.setAdapter(new TestAdapter(1000)); 68 setRecyclerView(recyclerView); 69 getInstrumentation().waitForIdleSync(); 70 assertThat("Test sanity", recyclerView.getChildCount() > 0, is(true)); 71 runTestOnUiThread(new Runnable() { 72 @Override 73 public void run() { 74 View lastChild = llm.getChildAt(llm.getChildCount() - 1); 75 int lastChildPos = recyclerView.getChildAdapterPosition(lastChild); 76 int targetPos = lastChildPos * 2; 77 llm.scrollToPosition(targetPos); 78 recyclerView.measure( 79 makeMeasureSpec(recyclerView.getWidth(), EXACTLY), 80 makeMeasureSpec(recyclerView.getHeight(), AT_MOST)); 81 assertThat(recyclerView.findViewHolderForAdapterPosition(targetPos), 82 notNullValue()); 83 // make sure it is still visible from top at least 84 int size = orientationHelper.getDecoratedMeasurement( 85 recyclerView.findViewHolderForAdapterPosition(targetPos).itemView); 86 recyclerView.measure( 87 makeMeasureSpec(recyclerView.getWidth(), EXACTLY), 88 makeMeasureSpec(size + 1, EXACTLY)); 89 recyclerView.layout(0, 0, recyclerView.getMeasuredWidth(), 90 recyclerView.getMeasuredHeight()); 91 assertThat(recyclerView.findViewHolderForAdapterPosition(targetPos), 92 notNullValue()); 93 RecyclerView.ViewHolder viewHolder = 94 recyclerView.findViewHolderForAdapterPosition(targetPos); 95 assertThat(viewHolder, notNullValue()); 96 Rect viewBounds = new Rect(); 97 llm.getDecoratedBoundsWithMargins(viewHolder.itemView, viewBounds); 98 Rect rvBounds = new Rect(0, 0, llm.getWidth(), llm.getHeight()); 99 assertThat(rvBounds + " vs " + viewBounds, rvBounds.contains(viewBounds), is(true)); 100 } 101 }); 102 } 103}