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- // Copyright 2021 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 <memory>
- #include "ash/controls/gradient_layer_delegate.h"
- #include "ash/controls/scroll_view_gradient_helper.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/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));
- scroll_view_->Layout();
- }
- bool HasGradientAtTop() {
- auto* gradient_layer = gradient_helper_->gradient_layer_for_test();
- return !gradient_layer->start_fade_zone_bounds().IsEmpty();
- }
- bool HasGradientAtBottom() {
- auto* gradient_layer = gradient_helper_->gradient_layer_for_test();
- return !gradient_layer->end_fade_zone_bounds().IsEmpty();
- }
- views::UniqueWidgetPtr widget_;
- views::ScrollView* 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_->UpdateGradientZone();
- EXPECT_FALSE(scroll_view_->layer()->layer_mask_layer());
- EXPECT_FALSE(gradient_helper_->gradient_layer_for_test());
- }
- TEST_F(ScrollViewGradientHelperTest, HasGradientForViewThatScrolls) {
- // Create a tall contents view.
- AddScrollViewContentsWithHeight(500);
- gradient_helper_->UpdateGradientZone();
- // Gradient is shown.
- EXPECT_TRUE(scroll_view_->layer()->layer_mask_layer());
- EXPECT_TRUE(gradient_helper_->gradient_layer_for_test());
- // Shrink the contents view.
- scroll_view_->contents()->SetSize({kWidgetWidth, 10});
- scroll_view_->Layout();
- gradient_helper_->UpdateGradientZone();
- // Gradient is removed.
- EXPECT_FALSE(scroll_view_->layer()->layer_mask_layer());
- EXPECT_FALSE(gradient_helper_->gradient_layer_for_test());
- }
- TEST_F(ScrollViewGradientHelperTest, ShowsGradientsBasedOnScrollPosition) {
- // Create a tall contents view.
- AddScrollViewContentsWithHeight(500);
- ASSERT_TRUE(scroll_view_->vertical_scroll_bar());
- gradient_helper_->UpdateGradientZone();
- // 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_->UpdateGradientZone();
- // Precondition: Mask layer exists.
- ASSERT_TRUE(scroll_view_->layer()->layer_mask_layer());
- // Deleting the helper removes the mask layer.
- gradient_helper_.reset();
- EXPECT_FALSE(scroll_view_->layer()->layer_mask_layer());
- }
- } // namespace
- } // namespace ash
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