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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits.h>
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/events/mobile_scroller.h"
namespace ui {
namespace {
const float kDefaultStartX = 7.f;
const float kDefaultStartY = 25.f;
const float kDefaultDeltaX = -20.f;
const float kDefaultDeltaY = 73.f;
const float kDefaultVelocityX = -350.f;
const float kDefaultVelocityY = 220.f;
const float kEpsilon = 1e-3f;
MobileScroller::Config DefaultConfig() {
return MobileScroller::Config();
}
} // namespace
using MobileScrollerTest = testing::Test;
TEST_F(MobileScrollerTest, Scroll) {
MobileScroller scroller(DefaultConfig());
base::TimeTicks start_time = base::TimeTicks::Now();
// Start a scroll and verify initialized values.
scroller.StartScroll(kDefaultStartX, kDefaultStartY, kDefaultDeltaX,
kDefaultDeltaY, start_time);
EXPECT_EQ(kDefaultStartX, scroller.GetStartX());
EXPECT_EQ(kDefaultStartY, scroller.GetStartY());
EXPECT_EQ(kDefaultStartX, scroller.GetCurrX());
EXPECT_EQ(kDefaultStartY, scroller.GetCurrY());
EXPECT_EQ(kDefaultStartX + kDefaultDeltaX, scroller.GetFinalX());
EXPECT_EQ(kDefaultStartY + kDefaultDeltaY, scroller.GetFinalY());
EXPECT_FALSE(scroller.IsFinished());
EXPECT_EQ(base::TimeDelta(), scroller.GetTimePassed());
// Advance halfway through the scroll.
const base::TimeDelta scroll_duration = scroller.GetDuration();
gfx::Vector2dF offset, velocity;
EXPECT_TRUE(scroller.ComputeScrollOffset(start_time + scroll_duration / 2,
&offset, &velocity));
// Ensure we've moved in the direction of the delta, but have yet to reach
// the target.
EXPECT_GT(kDefaultStartX, offset.x());
EXPECT_LT(kDefaultStartY, offset.y());
EXPECT_LT(scroller.GetFinalX(), offset.x());
EXPECT_GT(scroller.GetFinalY(), offset.y());
EXPECT_FALSE(scroller.IsFinished());
// Ensure our velocity is non-zero and in the same direction as the delta.
EXPECT_GT(0.f, velocity.x() * kDefaultDeltaX);
EXPECT_GT(0.f, velocity.y() * kDefaultDeltaY);
EXPECT_TRUE(scroller.IsScrollingInDirection(kDefaultDeltaX, kDefaultDeltaY));
// Repeated offset computations at the same timestamp should yield identical
// results.
float curr_x = offset.x();
float curr_y = offset.y();
float curr_velocity_x = velocity.x();
float curr_velocity_y = velocity.y();
EXPECT_TRUE(scroller.ComputeScrollOffset(start_time + scroll_duration / 2,
&offset, &velocity));
EXPECT_EQ(curr_x, offset.x());
EXPECT_EQ(curr_y, offset.y());
EXPECT_EQ(curr_velocity_x, velocity.x());
EXPECT_EQ(curr_velocity_y, velocity.y());
// Advance to the end.
EXPECT_FALSE(scroller.ComputeScrollOffset(start_time + scroll_duration,
&offset, &velocity));
EXPECT_EQ(scroller.GetFinalX(), offset.x());
EXPECT_EQ(scroller.GetFinalY(), offset.y());
EXPECT_TRUE(scroller.IsFinished());
EXPECT_EQ(scroll_duration, scroller.GetTimePassed());
EXPECT_NEAR(0.f, velocity.x(), kEpsilon);
EXPECT_NEAR(0.f, velocity.y(), kEpsilon);
// Try to advance further; nothing should change.
EXPECT_FALSE(scroller.ComputeScrollOffset(start_time + scroll_duration * 2,
&offset, &velocity));
EXPECT_EQ(scroller.GetFinalX(), offset.x());
EXPECT_EQ(scroller.GetFinalY(), offset.y());
EXPECT_TRUE(scroller.IsFinished());
EXPECT_EQ(scroll_duration, scroller.GetTimePassed());
}
TEST_F(MobileScrollerTest, Fling) {
MobileScroller scroller(DefaultConfig());
base::TimeTicks start_time = base::TimeTicks::Now();
// Start a fling and verify initialized values.
scroller.Fling(kDefaultStartX, kDefaultStartY, kDefaultVelocityX,
kDefaultVelocityY, INT_MIN, static_cast<float>(INT_MAX),
INT_MIN, static_cast<float>(INT_MAX), start_time);
EXPECT_EQ(kDefaultStartX, scroller.GetStartX());
EXPECT_EQ(kDefaultStartY, scroller.GetStartY());
EXPECT_EQ(kDefaultStartX, scroller.GetCurrX());
EXPECT_EQ(kDefaultStartY, scroller.GetCurrY());
EXPECT_GT(kDefaultStartX, scroller.GetFinalX());
EXPECT_LT(kDefaultStartY, scroller.GetFinalY());
EXPECT_FALSE(scroller.IsFinished());
EXPECT_EQ(base::TimeDelta(), scroller.GetTimePassed());
// Advance halfway through the fling.
const base::TimeDelta scroll_duration = scroller.GetDuration();
gfx::Vector2dF offset, velocity;
scroller.ComputeScrollOffset(start_time + scroll_duration / 2, &offset,
&velocity);
// Ensure we've moved in the direction of the velocity, but have yet to reach
// the target.
EXPECT_GT(kDefaultStartX, offset.x());
EXPECT_LT(kDefaultStartY, offset.y());
EXPECT_LT(scroller.GetFinalX(), offset.x());
EXPECT_GT(scroller.GetFinalY(), offset.y());
EXPECT_FALSE(scroller.IsFinished());
// Ensure our velocity is non-zero and in the same direction as the original
// velocity.
EXPECT_LT(0.f, velocity.x() * kDefaultVelocityX);
EXPECT_LT(0.f, velocity.y() * kDefaultVelocityY);
EXPECT_TRUE(
scroller.IsScrollingInDirection(kDefaultVelocityX, kDefaultVelocityY));
// Repeated offset computations at the same timestamp should yield identical
// results.
float curr_x = offset.x();
float curr_y = offset.y();
float curr_velocity_x = velocity.x();
float curr_velocity_y = velocity.y();
EXPECT_TRUE(scroller.ComputeScrollOffset(start_time + scroll_duration / 2,
&offset, &velocity));
EXPECT_EQ(curr_x, offset.x());
EXPECT_EQ(curr_y, offset.y());
EXPECT_EQ(curr_velocity_x, velocity.x());
EXPECT_EQ(curr_velocity_y, velocity.y());
// Advance to the end.
EXPECT_FALSE(scroller.ComputeScrollOffset(start_time + scroll_duration,
&offset, &velocity));
EXPECT_EQ(scroller.GetFinalX(), offset.x());
EXPECT_EQ(scroller.GetFinalY(), offset.y());
EXPECT_TRUE(scroller.IsFinished());
EXPECT_EQ(scroll_duration, scroller.GetTimePassed());
EXPECT_NEAR(0.f, velocity.x(), kEpsilon);
EXPECT_NEAR(0.f, velocity.y(), kEpsilon);
// Try to advance further; nothing should change.
EXPECT_FALSE(scroller.ComputeScrollOffset(start_time + scroll_duration * 2,
&offset, &velocity));
EXPECT_EQ(scroller.GetFinalX(), offset.x());
EXPECT_EQ(scroller.GetFinalY(), offset.y());
EXPECT_TRUE(scroller.IsFinished());
EXPECT_EQ(scroll_duration, scroller.GetTimePassed());
}
} // namespace ui
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