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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "ash/controls/gradient_layer_delegate.h"
#include "ash/controls/scroll_view_gradient_helper.h"
#include "base/memory/raw_ptr.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_type.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/views/controls/scroll_view.h"
#include "ui/views/test/views_test_base.h"
#include "ui/views/test/views_test_utils.h"
#include "ui/views/widget/unique_widget_ptr.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_utils.h"
namespace ash {
namespace {
constexpr int kWidgetHeight = 100;
constexpr int kWidgetWidth = 100;
constexpr int kGradientSize = 16;
// Uses ViewsTestBase because we may want to move this helper into //ui/views
// in the future.
class ScrollViewGradientHelperTest : public views::ViewsTestBase {
public:
ScrollViewGradientHelperTest() = default;
~ScrollViewGradientHelperTest() override = default;
// testing::Test:
void SetUp() override {
ViewsTestBase::SetUp();
// Create a small widget.
widget_ = std::make_unique<views::Widget>();
views::Widget::InitParams params =
CreateParams(views::Widget::InitParams::TYPE_POPUP);
params.bounds = gfx::Rect(10, 10, kWidgetWidth, kWidgetHeight);
widget_->Init(std::move(params));
widget_->Show();
// Add a scroll view and gradient helper.
auto* contents = widget_->SetContentsView(std::make_unique<views::View>());
scroll_view_ =
contents->AddChildView(std::make_unique<views::ScrollView>());
scroll_view_->SetBounds(0, 0, kWidgetWidth, kWidgetHeight);
scroll_view_->SetPaintToLayer(ui::LAYER_NOT_DRAWN);
gradient_helper_ =
std::make_unique<ScrollViewGradientHelper>(scroll_view_, kGradientSize);
}
void TearDown() override {
gradient_helper_.reset();
widget_.reset();
ViewsTestBase::TearDown();
}
void AddScrollViewContentsWithHeight(int height) {
auto contents = std::make_unique<views::View>();
contents->SetSize({kWidgetWidth, height});
scroll_view_->SetContents(std::move(contents));
views::test::RunScheduledLayout(scroll_view_);
}
bool HasGradientAtTop() {
const auto& gradient_mask = gradient_helper_->gradient_mask_for_test();
EXPECT_FALSE(gradient_mask.IsEmpty());
return cc::MathUtil::IsWithinEpsilon(gradient_mask.steps()[0].fraction,
0.f);
}
bool HasGradientAtBottom() {
const auto& gradient_mask = gradient_helper_->gradient_mask_for_test();
EXPECT_FALSE(gradient_mask.IsEmpty());
return cc::MathUtil::IsWithinEpsilon(
gradient_mask.steps()[gradient_mask.step_count() - 1].fraction, 1.f);
}
bool HasGradientMask(const ui::Layer* layer) {
return !layer->gradient_mask().IsEmpty();
}
views::UniqueWidgetPtr widget_;
raw_ptr<views::ScrollView, DanglingUntriaged | ExperimentalAsh> scroll_view_ =
nullptr;
std::unique_ptr<ScrollViewGradientHelper> gradient_helper_;
};
TEST_F(ScrollViewGradientHelperTest, NoGradientForViewThatDoesNotScroll) {
// Create a short contents view, so the scroll view won't scroll.
AddScrollViewContentsWithHeight(10);
gradient_helper_->UpdateGradientMask();
EXPECT_FALSE(HasGradientMask(scroll_view_->layer()));
EXPECT_TRUE(gradient_helper_->gradient_mask_for_test().IsEmpty());
}
TEST_F(ScrollViewGradientHelperTest, HasGradientForViewThatScrolls) {
// Create a tall contents view.
AddScrollViewContentsWithHeight(500);
gradient_helper_->UpdateGradientMask();
// Gradient is shown.
EXPECT_TRUE(HasGradientMask(scroll_view_->layer()));
EXPECT_FALSE(gradient_helper_->gradient_mask_for_test().IsEmpty());
// Shrink the contents view.
scroll_view_->contents()->SetSize({kWidgetWidth, 10});
views::test::RunScheduledLayout(scroll_view_);
gradient_helper_->UpdateGradientMask();
// Gradient is removed.
EXPECT_FALSE(HasGradientMask(scroll_view_->layer()));
EXPECT_TRUE(gradient_helper_->gradient_mask_for_test().IsEmpty());
}
TEST_F(ScrollViewGradientHelperTest, ShowsGradientsBasedOnScrollPosition) {
// Create a tall contents view.
AddScrollViewContentsWithHeight(500);
ASSERT_TRUE(scroll_view_->vertical_scroll_bar());
gradient_helper_->UpdateGradientMask();
// Because the scroll position is at the top, only the bottom gradient shows.
EXPECT_FALSE(HasGradientAtTop());
EXPECT_TRUE(HasGradientAtBottom());
// Scroll down. Now both top and bottom should have gradients.
scroll_view_->vertical_scroll_bar()->ScrollByAmount(
views::ScrollBar::ScrollAmount::kNextLine);
EXPECT_TRUE(HasGradientAtTop());
EXPECT_TRUE(HasGradientAtBottom());
// Scroll to end. Now only the top should have a gradient.
scroll_view_->vertical_scroll_bar()->ScrollByAmount(
views::ScrollBar::ScrollAmount::kEnd);
EXPECT_TRUE(HasGradientAtTop());
EXPECT_FALSE(HasGradientAtBottom());
}
TEST_F(ScrollViewGradientHelperTest, DeletingHelperRemovesMaskLayer) {
// Create a tall contents view.
AddScrollViewContentsWithHeight(500);
gradient_helper_->UpdateGradientMask();
// Precondition: Mask exists.
ASSERT_TRUE(HasGradientMask(scroll_view_->layer()));
gradient_helper_.reset();
ASSERT_FALSE(HasGradientMask(scroll_view_->layer()));
}
} // namespace
} // namespace ash
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