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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/views/overlay/overlay_controls_fade_animation.h"
#include "chrome/test/views/chrome_views_test_base.h"
#include "ui/compositor/layer.h"
#include "ui/views/view.h"
namespace {
using OverlayControlsFadeAnimationTest = ChromeViewsTestBase;
TEST_F(OverlayControlsFadeAnimationTest, AnimatesViewLayerOpacity) {
auto view = std::make_unique<views::View>();
view->SetPaintToLayer(ui::LAYER_NOT_DRAWN);
ASSERT_EQ(1.0, view->layer()->opacity());
// Create an animation to hide the view.
auto animation = std::make_unique<OverlayControlsFadeAnimation>(
*view, OverlayControlsFadeAnimation::Type::kToHidden);
animation->Start();
// Partway through the animation, the opacity should be between 1 and 0.
task_environment()->FastForwardBy(base::Milliseconds(100));
const float middle_hide_opacity = view->layer()->opacity();
EXPECT_LT(middle_hide_opacity, 1.0);
EXPECT_GT(middle_hide_opacity, 0.0);
// By the end of the animation, the opacity should be 0.
task_environment()->FastForwardBy(base::Milliseconds(200));
EXPECT_EQ(view->layer()->opacity(), 0.0);
// Create an animation to show the view.
animation = std::make_unique<OverlayControlsFadeAnimation>(
*view, OverlayControlsFadeAnimation::Type::kToShown);
animation->Start();
// Partway through the animation, the opacity should be between 0 and 1.
task_environment()->FastForwardBy(base::Milliseconds(100));
const float middle_show_opacity = view->layer()->opacity();
EXPECT_GT(middle_show_opacity, 0.0);
EXPECT_LT(middle_show_opacity, 1.0);
// By the end of the animation, the opacity should be 1.
task_environment()->FastForwardBy(base::Milliseconds(200));
EXPECT_EQ(view->layer()->opacity(), 1.0);
}
} // namespace
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