1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/time/time.h" 6 #include "testing/gtest/include/gtest/gtest.h" 7 #include "ui/gfx/android/scroller.h" 8 9 namespace gfx { 10 11 namespace { 12 13 const float kDefaultStartX = 7.f; 14 const float kDefaultStartY = 25.f; 15 const float kDefaultDeltaX = -20.f; 16 const float kDefaultDeltaY = 73.f; 17 const float kDefaultVelocityX = -35.f; 18 const float kDefaultVelocityY = 22.f; 19 const float kEpsilon = 1e-3f; 20 21 Scroller::Config DefaultConfig() { 22 return Scroller::Config(); 23 } 24 25 } // namespace 26 27 class ScrollerTest : public testing::Test {}; 28 29 TEST_F(ScrollerTest, Scroll) { 30 Scroller scroller(DefaultConfig()); 31 base::TimeTicks start_time = base::TimeTicks::Now(); 32 33 // Start a scroll and verify initialized values. 34 scroller.StartScroll(kDefaultStartX, 35 kDefaultStartY, 36 kDefaultDeltaX, 37 kDefaultDeltaY, 38 start_time); 39 40 EXPECT_EQ(kDefaultStartX, scroller.GetStartX()); 41 EXPECT_EQ(kDefaultStartY, scroller.GetStartY()); 42 EXPECT_EQ(kDefaultStartX, scroller.GetCurrX()); 43 EXPECT_EQ(kDefaultStartY, scroller.GetCurrY()); 44 EXPECT_EQ(kDefaultStartX + kDefaultDeltaX, scroller.GetFinalX()); 45 EXPECT_EQ(kDefaultStartY + kDefaultDeltaY, scroller.GetFinalY()); 46 EXPECT_FALSE(scroller.IsFinished()); 47 EXPECT_EQ(base::TimeDelta(), scroller.GetTimePassed()); 48 49 // Advance halfway through the scroll. 50 const base::TimeDelta scroll_duration = scroller.GetDuration(); 51 scroller.ComputeScrollOffset(start_time + scroll_duration / 2); 52 53 // Ensure we've moved in the direction of the delta, but have yet to reach 54 // the target. 55 EXPECT_GT(kDefaultStartX, scroller.GetCurrX()); 56 EXPECT_LT(kDefaultStartY, scroller.GetCurrY()); 57 EXPECT_LT(scroller.GetFinalX(), scroller.GetCurrX()); 58 EXPECT_GT(scroller.GetFinalY(), scroller.GetCurrY()); 59 EXPECT_FALSE(scroller.IsFinished()); 60 61 // Ensure our velocity is non-zero and in the same direction as the delta. 62 EXPECT_GT(0.f, scroller.GetCurrVelocityX() * kDefaultDeltaX); 63 EXPECT_GT(0.f, scroller.GetCurrVelocityY() * kDefaultDeltaY); 64 EXPECT_TRUE(scroller.IsScrollingInDirection(kDefaultDeltaX, kDefaultDeltaY)); 65 66 // Repeated offset computations at the same timestamp should yield identical 67 // results. 68 float curr_x = scroller.GetCurrX(); 69 float curr_y = scroller.GetCurrY(); 70 float curr_velocity_x = scroller.GetCurrVelocityX(); 71 float curr_velocity_y = scroller.GetCurrVelocityY(); 72 scroller.ComputeScrollOffset(start_time + scroll_duration / 2); 73 EXPECT_EQ(curr_x, scroller.GetCurrX()); 74 EXPECT_EQ(curr_y, scroller.GetCurrY()); 75 EXPECT_EQ(curr_velocity_x, scroller.GetCurrVelocityX()); 76 EXPECT_EQ(curr_velocity_y, scroller.GetCurrVelocityY()); 77 78 // Advance to the end. 79 scroller.ComputeScrollOffset(start_time + scroll_duration); 80 EXPECT_EQ(scroller.GetFinalX(), scroller.GetCurrX()); 81 EXPECT_EQ(scroller.GetFinalY(), scroller.GetCurrY()); 82 EXPECT_TRUE(scroller.IsFinished()); 83 EXPECT_EQ(scroll_duration, scroller.GetTimePassed()); 84 EXPECT_NEAR(0.f, scroller.GetCurrVelocityX(), kEpsilon); 85 EXPECT_NEAR(0.f, scroller.GetCurrVelocityY(), kEpsilon); 86 87 // Try to advance further; nothing should change. 88 scroller.ComputeScrollOffset(start_time + scroll_duration * 2); 89 EXPECT_EQ(scroller.GetFinalX(), scroller.GetCurrX()); 90 EXPECT_EQ(scroller.GetFinalY(), scroller.GetCurrY()); 91 EXPECT_TRUE(scroller.IsFinished()); 92 EXPECT_EQ(scroll_duration, scroller.GetTimePassed()); 93 } 94 95 TEST_F(ScrollerTest, Fling) { 96 Scroller scroller(DefaultConfig()); 97 base::TimeTicks start_time = base::TimeTicks::Now(); 98 99 // Start a fling and verify initialized values. 100 scroller.Fling(kDefaultStartX, 101 kDefaultStartY, 102 kDefaultVelocityX, 103 kDefaultVelocityY, 104 INT_MIN, 105 INT_MAX, 106 INT_MIN, 107 INT_MAX, 108 start_time); 109 110 EXPECT_EQ(kDefaultStartX, scroller.GetStartX()); 111 EXPECT_EQ(kDefaultStartY, scroller.GetStartY()); 112 EXPECT_EQ(kDefaultStartX, scroller.GetCurrX()); 113 EXPECT_EQ(kDefaultStartY, scroller.GetCurrY()); 114 EXPECT_GT(kDefaultStartX, scroller.GetFinalX()); 115 EXPECT_LT(kDefaultStartY, scroller.GetFinalY()); 116 EXPECT_FALSE(scroller.IsFinished()); 117 EXPECT_EQ(base::TimeDelta(), scroller.GetTimePassed()); 118 119 // Advance halfway through the fling. 120 const base::TimeDelta scroll_duration = scroller.GetDuration(); 121 scroller.ComputeScrollOffset(start_time + scroll_duration / 2); 122 123 // Ensure we've moved in the direction of the velocity, but have yet to reach 124 // the target. 125 EXPECT_GT(kDefaultStartX, scroller.GetCurrX()); 126 EXPECT_LT(kDefaultStartY, scroller.GetCurrY()); 127 EXPECT_LT(scroller.GetFinalX(), scroller.GetCurrX()); 128 EXPECT_GT(scroller.GetFinalY(), scroller.GetCurrY()); 129 EXPECT_FALSE(scroller.IsFinished()); 130 131 // Ensure our velocity is non-zero and in the same direction as the original 132 // velocity. 133 EXPECT_LT(0.f, scroller.GetCurrVelocityX() * kDefaultVelocityX); 134 EXPECT_LT(0.f, scroller.GetCurrVelocityY() * kDefaultVelocityY); 135 EXPECT_TRUE( 136 scroller.IsScrollingInDirection(kDefaultVelocityX, kDefaultVelocityY)); 137 138 // Repeated offset computations at the same timestamp should yield identical 139 // results. 140 float curr_x = scroller.GetCurrX(); 141 float curr_y = scroller.GetCurrY(); 142 float curr_velocity_x = scroller.GetCurrVelocityX(); 143 float curr_velocity_y = scroller.GetCurrVelocityY(); 144 scroller.ComputeScrollOffset(start_time + scroll_duration / 2); 145 EXPECT_EQ(curr_x, scroller.GetCurrX()); 146 EXPECT_EQ(curr_y, scroller.GetCurrY()); 147 EXPECT_EQ(curr_velocity_x, scroller.GetCurrVelocityX()); 148 EXPECT_EQ(curr_velocity_y, scroller.GetCurrVelocityY()); 149 150 // Advance to the end. 151 scroller.ComputeScrollOffset(start_time + scroll_duration); 152 EXPECT_EQ(scroller.GetFinalX(), scroller.GetCurrX()); 153 EXPECT_EQ(scroller.GetFinalY(), scroller.GetCurrY()); 154 EXPECT_TRUE(scroller.IsFinished()); 155 EXPECT_EQ(scroll_duration, scroller.GetTimePassed()); 156 EXPECT_NEAR(0.f, scroller.GetCurrVelocityX(), kEpsilon); 157 EXPECT_NEAR(0.f, scroller.GetCurrVelocityY(), kEpsilon); 158 159 // Try to advance further; nothing should change. 160 scroller.ComputeScrollOffset(start_time + scroll_duration * 2); 161 EXPECT_EQ(scroller.GetFinalX(), scroller.GetCurrX()); 162 EXPECT_EQ(scroller.GetFinalY(), scroller.GetCurrY()); 163 EXPECT_TRUE(scroller.IsFinished()); 164 EXPECT_EQ(scroll_duration, scroller.GetTimePassed()); 165 } 166 167 } // namespace gfx 168
