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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/input/snap_fling_curve.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cc {
namespace test {
TEST(SnapFlingCurveTest, CurveInitialization) {
SnapFlingCurve active_curve(gfx::PointF(100, 100), gfx::PointF(500, 500),
base::TimeTicks());
EXPECT_FALSE(active_curve.IsFinished());
SnapFlingCurve finished_curve(gfx::PointF(100, 100), gfx::PointF(100, 100),
base::TimeTicks());
EXPECT_TRUE(finished_curve.IsFinished());
}
TEST(SnapFlingCurveTest, AdvanceHalfwayThrough) {
SnapFlingCurve curve(gfx::PointF(100, 100), gfx::PointF(500, 500),
base::TimeTicks());
base::TimeDelta duration = curve.duration();
gfx::Vector2dF delta1 =
curve.GetScrollDelta(base::TimeTicks() + duration / 2);
EXPECT_LT(0, delta1.x());
EXPECT_LT(0, delta1.y());
EXPECT_FALSE(curve.IsFinished());
// Repeated offset computations at the same timestamp before applying the
// scrolled delta should yield identical results.
gfx::Vector2dF delta2 =
curve.GetScrollDelta(base::TimeTicks() + duration / 2);
EXPECT_EQ(delta1, delta2);
EXPECT_FALSE(curve.IsFinished());
curve.UpdateCurrentOffset(gfx::PointF(100, 100) + delta1);
EXPECT_FALSE(curve.IsFinished());
}
TEST(SnapFlingCurveTest, AdvanceFullyThrough) {
SnapFlingCurve curve(gfx::PointF(100, 100), gfx::PointF(500, 500),
base::TimeTicks());
gfx::Vector2dF delta =
curve.GetScrollDelta(base::TimeTicks() + curve.duration());
EXPECT_EQ(gfx::Vector2dF(400, 400), delta);
EXPECT_TRUE(curve.IsFinished());
}
TEST(SnapFlingCurveTest, ReturnsZeroAfterFinished) {
SnapFlingCurve curve(gfx::PointF(100, 100), gfx::PointF(500, 500),
base::TimeTicks());
curve.UpdateCurrentOffset(gfx::PointF(500, 500));
gfx::Vector2dF delta = curve.GetScrollDelta(base::TimeTicks());
EXPECT_EQ(gfx::Vector2dF(), delta);
EXPECT_TRUE(curve.IsFinished());
delta = curve.GetScrollDelta(base::TimeTicks() + curve.duration());
EXPECT_EQ(gfx::Vector2dF(), delta);
EXPECT_TRUE(curve.IsFinished());
}
TEST(SnapFlingCurveTest, FlingFinishesWithinOnePixel) {
SnapFlingCurve curve(gfx::PointF(0, 0), gfx::PointF(100.5, 99.5),
base::TimeTicks());
EXPECT_FALSE(curve.IsFinished());
curve.UpdateCurrentOffset(gfx::PointF(99, 101));
// IsFinished() is updated in GetScrollDelta().
curve.GetScrollDelta(base::TimeTicks());
EXPECT_FALSE(curve.IsFinished());
curve.UpdateCurrentOffset(gfx::PointF(100, 100));
curve.GetScrollDelta(base::TimeTicks());
EXPECT_TRUE(curve.IsFinished());
}
} // namespace test
} // namespace cc
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