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 17 package com.android.documentsui.ui; 18 19 import static org.junit.Assert.assertTrue; 20 import static org.junit.Assert.fail; 21 22 import android.graphics.Point; 23 import android.support.test.filters.SmallTest; 24 import android.support.test.runner.AndroidJUnit4; 25 26 import com.android.documentsui.ui.ViewAutoScroller; 27 28 import org.junit.Before; 29 import org.junit.Test; 30 import org.junit.runner.RunWith; 31 32 import java.util.function.IntConsumer; 33 34 @RunWith(AndroidJUnit4.class) 35 @SmallTest 36 public final class ViewAutoScrollerTest { 37 38 private static final int VIEW_HEIGHT = 100; 39 private static final int TOP_Y_POINT = (int) (VIEW_HEIGHT 40 * ViewAutoScroller.TOP_BOTTOM_THRESHOLD_RATIO) - 1; 41 private static final int BOTTOM_Y_POINT = VIEW_HEIGHT 42 - (int) (VIEW_HEIGHT * ViewAutoScroller.TOP_BOTTOM_THRESHOLD_RATIO) 43 + 1; 44 private static final int EDGE_HEIGHT = 5; 45 46 private ViewAutoScroller mAutoScroller; 47 private Point mPoint; 48 private boolean mActive; 49 private ViewAutoScroller.ScrollDistanceDelegate mDistanceDelegate; 50 private ViewAutoScroller.ScrollActionDelegate mActionDelegate; 51 private IntConsumer mScrollAssert; 52 53 @Before setUp()54 public void setUp() { 55 mActive = false; 56 mPoint = new Point(); 57 mDistanceDelegate = new ViewAutoScroller.ScrollDistanceDelegate() { 58 @Override 59 public boolean isActive() { 60 return mActive; 61 } 62 63 @Override 64 public int getViewHeight() { 65 return VIEW_HEIGHT; 66 } 67 68 @Override 69 public Point getCurrentPosition() { 70 return mPoint; 71 } 72 }; 73 mActionDelegate = new ViewAutoScroller.ScrollActionDelegate() { 74 @Override 75 public void scrollBy(int dy) { 76 mScrollAssert.accept(dy); 77 } 78 79 @Override 80 public void runAtNextFrame(Runnable r) { 81 } 82 83 @Override 84 public void removeCallback(Runnable r) { 85 } 86 }; 87 mAutoScroller = new ViewAutoScroller(mDistanceDelegate, mActionDelegate); 88 } 89 90 @Test testCursorNotInScrollZone()91 public void testCursorNotInScrollZone() { 92 mPoint = new Point(0, VIEW_HEIGHT/2); 93 mScrollAssert = (int dy) -> { 94 // Should not have called this method 95 fail("Received unexpected scroll event"); 96 assertTrue(false); 97 }; 98 mAutoScroller.run(); 99 } 100 101 @Test testCursorInScrollZone_notActive()102 public void testCursorInScrollZone_notActive() { 103 mActive = false; 104 mPoint = new Point(0, TOP_Y_POINT); 105 mScrollAssert = (int dy) -> { 106 // Should not have called this method 107 fail("Received unexpected scroll event"); 108 assertTrue(false); 109 }; 110 mAutoScroller.run(); 111 } 112 113 @Test testCursorInScrollZone_top()114 public void testCursorInScrollZone_top() { 115 mActive = true; 116 mPoint = new Point(0, TOP_Y_POINT); 117 int expectedScrollDistance = mAutoScroller.computeScrollDistance(-1); 118 mScrollAssert = (int dy) -> { 119 assertTrue(dy == expectedScrollDistance); 120 }; 121 mAutoScroller.run(); 122 } 123 124 @Test testCursorInScrollZone_bottom()125 public void testCursorInScrollZone_bottom() { 126 mActive = true; 127 mPoint = new Point(0, BOTTOM_Y_POINT); 128 int expectedScrollDistance = mAutoScroller.computeScrollDistance(1); 129 mScrollAssert = (int dy) -> { 130 assertTrue(dy == expectedScrollDistance); 131 }; 132 mAutoScroller.run(); 133 } 134 } 135