1/*
2 * Copyright (C) 2017 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.wear.widget;
18
19import static org.mockito.Mockito.times;
20import static org.mockito.Mockito.verify;
21
22import static java.lang.Math.cos;
23import static java.lang.Math.sin;
24
25import android.os.SystemClock;
26import android.support.test.filters.MediumTest;
27import android.support.test.rule.ActivityTestRule;
28import android.support.test.runner.AndroidJUnit4;
29import android.view.MotionEvent;
30
31import androidx.wear.widget.util.WakeLockRule;
32
33import org.junit.Before;
34import org.junit.Rule;
35import org.junit.Test;
36import org.junit.runner.RunWith;
37import org.mockito.Mock;
38import org.mockito.MockitoAnnotations;
39
40@MediumTest
41@RunWith(AndroidJUnit4.class)
42public class ScrollManagerTest {
43    private static final int TEST_WIDTH = 400;
44    private static final int TEST_HEIGHT = 400;
45    private static final int STEP_COUNT = 300;
46
47    private static final int EXPECTED_SCROLLS_FOR_STRAIGHT_GESTURE = 36;
48    private static final int EXPECTED_SCROLLS_FOR_CIRCULAR_GESTURE = 199;
49
50    @Rule
51    public final WakeLockRule wakeLock = new WakeLockRule();
52
53    @Rule
54    public final ActivityTestRule<WearableRecyclerViewTestActivity> mActivityRule =
55            new ActivityTestRule<>(WearableRecyclerViewTestActivity.class, true, true);
56
57    @Mock
58    WearableRecyclerView mMockWearableRecyclerView;
59
60    ScrollManager mScrollManagerUnderTest;
61
62    @Before
63    public void setUp() throws Throwable {
64        MockitoAnnotations.initMocks(this);
65        mScrollManagerUnderTest = new ScrollManager();
66        mScrollManagerUnderTest.setRecyclerView(mMockWearableRecyclerView, TEST_WIDTH, TEST_HEIGHT);
67    }
68
69    @Test
70    public void testStraightUpScrollingGestureLeft() throws Throwable {
71        // Pretend to scroll in a straight line from center left to upper left
72        scroll(mScrollManagerUnderTest, 30, 30, 200, 150);
73        // The scroll manager should require the recycler view to scroll up and only up
74        verify(mMockWearableRecyclerView, times(EXPECTED_SCROLLS_FOR_STRAIGHT_GESTURE))
75                .scrollBy(0, 1);
76    }
77
78    @Test
79    public void testStraightDownScrollingGestureLeft() throws Throwable {
80        // Pretend to scroll in a straight line upper left to center left
81        scroll(mScrollManagerUnderTest, 30, 30, 150, 200);
82        // The scroll manager should require the recycler view to scroll down and only down
83        verify(mMockWearableRecyclerView, times(EXPECTED_SCROLLS_FOR_STRAIGHT_GESTURE))
84                .scrollBy(0, -1);
85    }
86
87    @Test
88    public void testStraightUpScrollingGestureRight() throws Throwable {
89        // Pretend to scroll in a straight line from center right to upper right
90        scroll(mScrollManagerUnderTest, 370, 370, 200, 150);
91        // The scroll manager should require the recycler view to scroll down and only down
92        verify(mMockWearableRecyclerView, times(EXPECTED_SCROLLS_FOR_STRAIGHT_GESTURE))
93                .scrollBy(0, -1);
94    }
95
96    @Test
97    public void testStraightDownScrollingGestureRight() throws Throwable {
98        // Pretend to scroll in a straight line upper right to center right
99        scroll(mScrollManagerUnderTest, 370, 370, 150, 200);
100        // The scroll manager should require the recycler view to scroll up and only up
101        verify(mMockWearableRecyclerView, times(EXPECTED_SCROLLS_FOR_STRAIGHT_GESTURE))
102                .scrollBy(0, 1);
103    }
104
105    @Test
106    public void testCircularScrollingGestureLeft() throws Throwable {
107        // Pretend to scroll in an arch from center left to center right
108        scrollOnArch(mScrollManagerUnderTest, 30, 200, 180.0f);
109        // The scroll manager should never reverse the scroll direction and scroll up
110        verify(mMockWearableRecyclerView, times(EXPECTED_SCROLLS_FOR_CIRCULAR_GESTURE))
111                .scrollBy(0, 1);
112    }
113
114    @Test
115    public void testCircularScrollingGestureRight() throws Throwable {
116        // Pretend to scroll in an arch from center left to center right
117        scrollOnArch(mScrollManagerUnderTest, 370, 200, -180.0f);
118        // The scroll manager should never reverse the scroll direction and scroll down.
119        verify(mMockWearableRecyclerView, times(EXPECTED_SCROLLS_FOR_CIRCULAR_GESTURE))
120                .scrollBy(0, -1);
121    }
122
123    private static void scroll(ScrollManager scrollManager, float fromX, float toX, float fromY,
124            float toY) {
125        long downTime = SystemClock.uptimeMillis();
126        long eventTime = SystemClock.uptimeMillis();
127
128        float y = fromY;
129        float x = fromX;
130
131        float yStep = (toY - fromY) / STEP_COUNT;
132        float xStep = (toX - fromX) / STEP_COUNT;
133
134        MotionEvent event = MotionEvent.obtain(downTime, eventTime,
135                MotionEvent.ACTION_DOWN, x, y, 0);
136        scrollManager.onTouchEvent(event);
137        for (int i = 0; i < STEP_COUNT; ++i) {
138            y += yStep;
139            x += xStep;
140            eventTime = SystemClock.uptimeMillis();
141            event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, x, y, 0);
142            scrollManager.onTouchEvent(event);
143        }
144
145        eventTime = SystemClock.uptimeMillis();
146        event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_UP, x, y, 0);
147        scrollManager.onTouchEvent(event);
148    }
149
150    private static void scrollOnArch(ScrollManager scrollManager, float fromX, float fromY,
151            float deltaAngle) {
152        long downTime = SystemClock.uptimeMillis();
153        long eventTime = SystemClock.uptimeMillis();
154
155        float stepAngle = deltaAngle / STEP_COUNT;
156        double relativeX = fromX - (TEST_WIDTH / 2);
157        double relativeY = fromY - (TEST_HEIGHT / 2);
158        float radius = (float) Math.sqrt(relativeX * relativeX + relativeY * relativeY);
159        float angle = getAngle(fromX, fromY, TEST_WIDTH, TEST_HEIGHT);
160
161        float y = fromY;
162        float x = fromX;
163
164        MotionEvent event = MotionEvent.obtain(downTime, eventTime,
165                MotionEvent.ACTION_DOWN, x, y, 0);
166        scrollManager.onTouchEvent(event);
167        for (int i = 0; i < STEP_COUNT; ++i) {
168            angle += stepAngle;
169            x = getX(angle, radius, TEST_WIDTH);
170            y = getY(angle, radius, TEST_HEIGHT);
171            eventTime = SystemClock.uptimeMillis();
172            event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, x, y, 0);
173            scrollManager.onTouchEvent(event);
174        }
175
176        eventTime = SystemClock.uptimeMillis();
177        event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_UP, x, y, 0);
178        scrollManager.onTouchEvent(event);
179    }
180
181    private static float getX(double angle, double radius, double viewWidth) {
182        double radianAngle = Math.toRadians(angle - 90);
183        double relativeX = cos(radianAngle) * radius;
184        return (float) (relativeX + (viewWidth / 2));
185    }
186
187    private static float getY(double angle, double radius, double viewHeight) {
188        double radianAngle = Math.toRadians(angle - 90);
189        double relativeY = sin(radianAngle) * radius;
190        return (float) (relativeY + (viewHeight / 2));
191    }
192
193    private static float getAngle(double x, double y, double viewWidth, double viewHeight) {
194        double relativeX = x - (viewWidth / 2);
195        double relativeY = y - (viewHeight / 2);
196        double rowAngle = Math.atan2(relativeX, relativeY);
197        double angle = -Math.toDegrees(rowAngle) - 180;
198        if (angle < 0) {
199            angle += 360;
200        }
201        return (float) angle;
202    }
203}
204