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
17package androidx.recyclerview.widget;
18
19import static org.junit.Assert.assertEquals;
20import static org.junit.Assert.assertFalse;
21import static org.junit.Assert.assertNull;
22import static org.junit.Assert.assertSame;
23import static org.junit.Assert.assertTrue;
24
25import android.content.Context;
26import android.support.test.InstrumentationRegistry;
27import android.support.test.filters.SmallTest;
28import android.support.test.runner.AndroidJUnit4;
29import android.view.View;
30import android.view.ViewGroup;
31
32import org.junit.Before;
33import org.junit.Test;
34import org.junit.runner.RunWith;
35
36import java.util.ArrayList;
37import java.util.List;
38
39@RunWith(AndroidJUnit4.class)
40@SmallTest
41public class ChildHelperTest {
42    LoggingCallback  mLoggingCallback;
43    ChildHelper mChildHelper;
44    Context mContext;
45
46    @Before
47    public void setup() throws Exception {
48        mContext = InstrumentationRegistry.getContext();
49        mLoggingCallback = new LoggingCallback();
50        mChildHelper = new ChildHelper(mLoggingCallback);
51    }
52
53    private RecyclerView.ViewHolder vh() {
54        View view = new View(mContext);
55        RecyclerViewBasicTest.MockViewHolder mockViewHolder
56                = new RecyclerViewBasicTest.MockViewHolder(view);
57        RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(0 , 0);
58        lp.mViewHolder = mockViewHolder;
59        view.setLayoutParams(lp);
60        return mockViewHolder;
61    }
62
63    @Test
64    public void addChild() {
65        RecyclerView.ViewHolder vh = vh();
66        mChildHelper.addView(vh.itemView, false);
67        assertEquals(1, mLoggingCallback.getChildCount());
68        assertFalse(mChildHelper.isHidden(vh.itemView));
69        assertEquals(0, mLoggingCallback.mOnEnteredHiddenState.size());
70    }
71
72    @Test
73    public void addChildHidden() {
74        RecyclerView.ViewHolder vh = vh();
75        mChildHelper.addView(vh.itemView, true);
76        assertEquals(1, mLoggingCallback.getChildCount());
77        assertTrue(mChildHelper.isHidden(vh.itemView));
78        assertTrue(mLoggingCallback.mOnEnteredHiddenState.contains(vh.itemView));
79    }
80
81    @Test
82    public void addChildAndHide() {
83        RecyclerView.ViewHolder vh = vh();
84        mChildHelper.addView(vh.itemView, false);
85        mChildHelper.hide(vh.itemView);
86        assertTrue(mChildHelper.isHidden(vh.itemView));
87        mChildHelper.unhide(vh.itemView);
88        assertFalse(mChildHelper.isHidden(vh.itemView));
89    }
90
91    @Test
92    public void findHiddenNonRemoved() {
93        RecyclerView.ViewHolder vh = vh();
94        vh.mPosition = 12;
95        mChildHelper.addView(vh.itemView, true);
96        assertSame(vh.itemView, mChildHelper.findHiddenNonRemovedView(12));
97    }
98
99    @Test
100    public void findHiddenRemoved() {
101        RecyclerView.ViewHolder vh = vh();
102        vh.mPosition = 12;
103        vh.addFlags(RecyclerView.ViewHolder.FLAG_REMOVED);
104        mChildHelper.addView(vh.itemView, true);
105        assertNull(mChildHelper.findHiddenNonRemovedView(12));
106    }
107
108    private static class LoggingCallback implements ChildHelper.Callback {
109        List<View> mViews = new ArrayList<>();
110        List<View> mDetached = new ArrayList<>();
111        List<View> mOnEnteredHiddenState = new ArrayList<>();
112        List<View> mOnExitedHiddenState = new ArrayList<>();
113        @Override
114        public int getChildCount() {
115            return mViews.size();
116        }
117
118        @Override
119        public void addView(View child, int index) {
120            mViews.add(index, child);
121        }
122
123        @Override
124        public int indexOfChild(View view) {
125            return mViews.indexOf(view);
126        }
127
128        private boolean validateIndex(int index) {
129            return index < getChildCount() && index >= 0;
130        }
131
132        @Override
133        public void removeViewAt(int index) {
134            if (validateIndex(index)) {
135                mViews.remove(index);
136            }
137        }
138
139        @Override
140        public View getChildAt(int offset) {
141            if (validateIndex(offset)) {
142                return mViews.remove(offset);
143            }
144            return null;
145        }
146
147        @Override
148        public void removeAllViews() {
149            mViews.clear();
150        }
151
152        @Override
153        public RecyclerView.ViewHolder getChildViewHolder(View view) {
154            return RecyclerView.getChildViewHolderInt(view);
155        }
156
157        @Override
158        public void attachViewToParent(View child, int index, ViewGroup.LayoutParams layoutParams) {
159            assertTrue(mDetached.remove(child));
160            addView(child, index);
161        }
162
163        @Override
164        public void detachViewFromParent(int offset) {
165            mDetached.add(getChildAt(offset));
166        }
167
168        @Override
169        public void onEnteredHiddenState(View child) {
170            mOnEnteredHiddenState.add(child);
171        }
172
173        @Override
174        public void onLeftHiddenState(View child) {
175            mOnExitedHiddenState.add(child);
176        }
177    }
178}
179