// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/input/scrollbar_animation_controller_thinning.h"

#include "cc/layers/solid_color_scrollbar_layer_impl.h"
#include "cc/test/fake_impl_task_runner_provider.h"
#include "cc/test/fake_layer_tree_host_impl.h"
#include "cc/test/geometry_test_utils.h"
#include "cc/test/test_shared_bitmap_manager.h"
#include "cc/test/test_task_graph_runner.h"
#include "cc/trees/layer_tree_impl.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

class ScrollbarAnimationControllerThinningTest
    : public testing::Test,
      public ScrollbarAnimationControllerClient {
 public:
  ScrollbarAnimationControllerThinningTest()
      : host_impl_(&task_runner_provider_,
                   &shared_bitmap_manager_,
                   &task_graph_runner_) {}

  void PostDelayedScrollbarAnimationTask(const base::Closure& start_fade,
                                         base::TimeDelta delay) override {
    start_fade_ = start_fade;
    delay_ = delay;
  }
  void SetNeedsRedrawForScrollbarAnimation() override {
    did_request_redraw_ = true;
  }
  void SetNeedsAnimateForScrollbarAnimation() override {
    did_request_animate_ = true;
  }
  ScrollbarSet ScrollbarsFor(int scroll_layer_id) const override {
    return host_impl_.ScrollbarsFor(scroll_layer_id);
  }

 protected:
  void SetUp() override {
    scoped_ptr<LayerImpl> scroll_layer =
        LayerImpl::Create(host_impl_.active_tree(), 1);
    clip_layer_ = LayerImpl::Create(host_impl_.active_tree(), 3);
    scroll_layer->SetScrollClipLayer(clip_layer_->id());
    LayerImpl* scroll_layer_ptr = scroll_layer.get();
    clip_layer_->AddChild(std::move(scroll_layer));

    const int kId = 2;
    const int kThumbThickness = 10;
    const int kTrackStart = 0;
    const bool kIsLeftSideVerticalScrollbar = false;
    const bool kIsOverlayScrollbar = true;
    scrollbar_layer_ = SolidColorScrollbarLayerImpl::Create(
        host_impl_.active_tree(), kId, HORIZONTAL, kThumbThickness, kTrackStart,
        kIsLeftSideVerticalScrollbar, kIsOverlayScrollbar);

    scrollbar_layer_->SetScrollLayerId(scroll_layer_ptr->id());
    clip_layer_->SetBounds(gfx::Size(100, 100));
    scroll_layer_ptr->SetBounds(gfx::Size(200, 200));

    scrollbar_controller_ = ScrollbarAnimationControllerThinning::Create(
        scroll_layer_ptr->id(), this, base::TimeDelta::FromSeconds(2),
        base::TimeDelta::FromSeconds(5), base::TimeDelta::FromSeconds(3));
  }

  FakeImplTaskRunnerProvider task_runner_provider_;
  TestSharedBitmapManager shared_bitmap_manager_;
  TestTaskGraphRunner task_graph_runner_;
  FakeLayerTreeHostImpl host_impl_;
  scoped_ptr<ScrollbarAnimationControllerThinning> scrollbar_controller_;
  scoped_ptr<LayerImpl> clip_layer_;
  scoped_ptr<SolidColorScrollbarLayerImpl> scrollbar_layer_;

  base::Closure start_fade_;
  base::TimeDelta delay_;
  bool did_request_redraw_;
  bool did_request_animate_;
};

// Check initialization of scrollbar.
TEST_F(ScrollbarAnimationControllerThinningTest, Idle) {
  scrollbar_controller_->Animate(base::TimeTicks());
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());
}

// Check that scrollbar disappears when the layer becomes non-scrollable.
TEST_F(ScrollbarAnimationControllerThinningTest, HideOnResize) {
  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
  ASSERT_TRUE(scroll_layer);
  EXPECT_EQ(gfx::Size(200, 200), scroll_layer->bounds());

  EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());

  // Shrink along X axis, horizontal scrollbar should appear.
  clip_layer_->SetBounds(gfx::Size(100, 200));
  EXPECT_EQ(gfx::Size(100, 200), clip_layer_->bounds());

  scrollbar_controller_->DidScrollBegin();

  scrollbar_controller_->DidScrollUpdate(false);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());

  scrollbar_controller_->DidScrollEnd();

  // Shrink along Y axis and expand along X, horizontal scrollbar
  // should disappear.
  clip_layer_->SetBounds(gfx::Size(200, 100));
  EXPECT_EQ(gfx::Size(200, 100), clip_layer_->bounds());

  scrollbar_controller_->DidScrollBegin();

  scrollbar_controller_->DidScrollUpdate(false);
  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->opacity());

  scrollbar_controller_->DidScrollEnd();
}

// Scroll content. Confirm the scrollbar gets dark and then becomes light
// after stopping.
TEST_F(ScrollbarAnimationControllerThinningTest, AwakenByProgrammaticScroll) {
  base::TimeTicks time;
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidScrollUpdate(false);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  // Scrollbar doesn't change size if triggered by scroll.
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  start_fade_.Run();

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Subsequent scroll restarts animation.
  scrollbar_controller_->DidScrollUpdate(false);

  start_fade_.Run();

  time += base::TimeDelta::FromSeconds(2);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.9f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());
}

// Initiate a scroll when the pointer is already near the scrollbar. It should
// remain thick.
TEST_F(ScrollbarAnimationControllerThinningTest, ScrollWithMouseNear) {
  base::TimeTicks time;
  time += base::TimeDelta::FromSeconds(1);

  scrollbar_controller_->DidMouseMoveNear(1);
  scrollbar_controller_->Animate(time);
  time += base::TimeDelta::FromSeconds(3);

  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  scrollbar_controller_->DidScrollUpdate(false);
  start_fade_.Run();
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  // Scrollbar should still be thick.
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(5);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
}

// Move the pointer near the scrollbar. Confirm it gets thick and narrow when
// moved away.
TEST_F(ScrollbarAnimationControllerThinningTest, MouseNear) {
  base::TimeTicks time;
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidMouseMoveNear(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Should animate to thickened but not darken.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.6f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Subsequent moves should not change anything.
  scrollbar_controller_->DidMouseMoveNear(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Now move away from bar.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidMouseMoveNear(26);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Animate to narrow.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.6f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());
}

// Move the pointer over the scrollbar. Make sure it gets thick and dark
// and that it gets thin and light when moved away.
TEST_F(ScrollbarAnimationControllerThinningTest, MouseOver) {
  base::TimeTicks time;
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidMouseMoveNear(0);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Should animate to thickened and darkened.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.6f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.9f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Subsequent moves should not change anything.
  scrollbar_controller_->DidMouseMoveNear(0);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Now move away from bar.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidMouseMoveNear(26);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Animate to narrow.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.9f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.6f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());
}

// First move the pointer near the scrollbar, then over it, then back near
// then far away. Confirm that first the bar gets thick, then dark, then light,
// then narrow.
TEST_F(ScrollbarAnimationControllerThinningTest, MouseNearThenOver) {
  base::TimeTicks time;
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidMouseMoveNear(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Should animate to thickened but not darken.
  time += base::TimeDelta::FromSeconds(3);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // Now move over.
  scrollbar_controller_->DidMouseMoveNear(0);
  scrollbar_controller_->Animate(time);

  // Should animate to darkened.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.9f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());

  // This is tricky. The DidMouseMoveOffScrollbar() is sent before the
  // subsequent DidMouseMoveNear(), if the mouse moves in that direction.
  // This results in the thumb thinning. We want to make sure that when the
  // thumb starts expanding it doesn't first narrow to the idle thinness.
  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->DidMouseMoveOffScrollbar();
  scrollbar_controller_->Animate(time);

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.9f, scrollbar_layer_->opacity());
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  scrollbar_controller_->DidMouseMoveNear(1);
  scrollbar_controller_->Animate(time);
  // A new animation is kicked off.

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  // We will initiate the narrowing again, but it won't get decremented until
  // the new animation catches up to it.
  EXPECT_FLOAT_EQ(0.9f, scrollbar_layer_->opacity());
  // Now the thickness should be increasing, but it shouldn't happen until the
  // animation catches up.
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->opacity());
  // The thickness now gets big again.
  EXPECT_FLOAT_EQ(0.8f, scrollbar_layer_->thumb_thickness_scale_factor());

  time += base::TimeDelta::FromSeconds(1);
  scrollbar_controller_->Animate(time);
  EXPECT_FLOAT_EQ(0.7f, scrollbar_layer_->opacity());
  // The thickness now gets big again.
  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
}

}  // namespace
}  // namespace cc