third_party/WebKit/Source/core/layout/ScrollbarsTest.cpp - chromium/src - Git at Google

 // Copyright 2016 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 "build/build_config.h"
 #include "core/frame/LocalFrameView.h"
 #include "core/frame/WebLocalFrameBase.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/PaintLayerScrollableArea.h"
 #include "core/testing/sim/SimDisplayItemList.h"
 #include "core/testing/sim/SimRequest.h"
 #include "core/testing/sim/SimTest.h"
 #include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "public/platform/WebThemeEngine.h"
 #include "public/web/WebScriptSource.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace blink {

 namespace {

 class ScrollbarsTest : private ScopedRootLayerScrollingForTest, public SimTest {
  public:
   ScrollbarsTest() : ScopedRootLayerScrollingForTest(true) {}
 };

 TEST_F(ScrollbarsTest, DocumentStyleRecalcPreservesScrollbars) {
   v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
   WebView().Resize(WebSize(800, 600));
   SimRequest request("https://example.com/test.html", "text/html");
   LoadURL("https://example.com/test.html");
   request.Complete("<style> body { width: 1600px; height: 1200px; } </style>");
   PaintLayerScrollableArea* plsa =
       GetDocument().GetLayoutView()->GetScrollableArea();

   Compositor().BeginFrame();
   ASSERT_TRUE(plsa->VerticalScrollbar() && plsa->HorizontalScrollbar());

   // Forces recalc of LayoutView's computed style in Document::updateStyle,
   // without invalidating layout.
   MainFrame().ExecuteScriptAndReturnValue(WebScriptSource(
       "document.querySelector('style').sheet.insertRule('body {}', 1);"));

   Compositor().BeginFrame();
   ASSERT_TRUE(plsa->VerticalScrollbar() && plsa->HorizontalScrollbar());
 }

 // Ensure that causing a change in scrollbar existence causes a nested layout
 // to recalculate the existence of the opposite scrollbar. The bug here was
 // caused by trying to avoid the layout when overlays are enabled but not
 // checking whether the scrollbars should be custom - which do take up layout
 // space. https://crbug.com/668387.
 TEST_F(ScrollbarsTest, CustomScrollbarsCauseLayoutOnExistenceChange) {
   // The bug reproduces only with RLS off. When RLS ships we can keep the test
   // but remove this setting.
   ScopedRootLayerScrollingForTest turn_off_root_layer_scrolling(false);

   // This test is specifically checking the behavior when overlay scrollbars
   // are enabled.
   DCHECK(ScrollbarTheme::GetTheme().UsesOverlayScrollbars());

   WebView().Resize(WebSize(800, 600));
   SimRequest request("https://example.com/test.html", "text/html");
   LoadURL("https://example.com/test.html");
   request.Complete(
       "<!DOCTYPE html>"
       "<style>"
       "  ::-webkit-scrollbar {"
       "      height: 16px;"
       "      width: 16px"
       "  }"
       "  ::-webkit-scrollbar-thumb {"
       "      background-color: rgba(0,0,0,.2);"
       "  }"
       "  html, body{"
       "    margin: 0;"
       "    height: 100%;"
       "  }"
       "  .box {"
       "    width: 100%;"
       "    height: 100%;"
       "  }"
       "  .transformed {"
       "    transform: translateY(100px);"
       "  }"
       "</style>"
       "<div id='box' class='box'></div>");

   ScrollableArea* layout_viewport =
       GetDocument().View()->LayoutViewportScrollableArea();

   Compositor().BeginFrame();
   ASSERT_FALSE(layout_viewport->VerticalScrollbar());
   ASSERT_FALSE(layout_viewport->HorizontalScrollbar());

   // Adding translation will cause a vertical scrollbar to appear but not dirty
   // layout otherwise. Ensure the change of scrollbar causes a layout to
   // recalculate the page width with the vertical scrollbar added.
   MainFrame().ExecuteScript(WebScriptSource(
       "document.getElementById('box').className = 'box transformed';"));
   Compositor().BeginFrame();

   ASSERT_TRUE(layout_viewport->VerticalScrollbar());
   ASSERT_FALSE(layout_viewport->HorizontalScrollbar());
 }

 TEST_F(ScrollbarsTest, TransparentBackgroundUsesDarkOverlayColorTheme) {
   // The bug reproduces only with RLS off. When RLS ships we can keep the test
   // but remove this setting.
   ScopedRootLayerScrollingForTest turn_off_root_layer_scrolling(false);

   // This test is specifically checking the behavior when overlay scrollbars
   // are enabled.
   DCHECK(ScrollbarTheme::GetTheme().UsesOverlayScrollbars());

   WebView().Resize(WebSize(800, 600));
   WebView().SetBaseBackgroundColorOverride(SK_ColorTRANSPARENT);
   SimRequest request("https://example.com/test.html", "text/html");
   LoadURL("https://example.com/test.html");
   request.Complete(
       "<!DOCTYPE html>"
       "<style>"
       "  body{"
       "    height: 300%;"
       "  }"
       "</style>");
   Compositor().BeginFrame();

   ScrollableArea* layout_viewport =
       GetDocument().View()->LayoutViewportScrollableArea();

   EXPECT_EQ(kScrollbarOverlayColorThemeDark,
             layout_viewport->GetScrollbarOverlayColorTheme());
 }

 typedef bool TestParamOverlayScrollbar;
 class ScrollbarAppearanceTest
     : public SimTest,
       public ::testing::WithParamInterface<TestParamOverlayScrollbar> {
  public:
   // Use real scrollbars to ensure we're testing the real ScrollbarThemes.
   ScrollbarAppearanceTest() : mock_scrollbars_(false, GetParam()) {}

  private:
   FrameTestHelpers::UseMockScrollbarSettings mock_scrollbars_;
 };

 class StubWebThemeEngine : public WebThemeEngine {
  public:
   WebSize GetSize(Part part) override {
     switch (part) {
       case kPartScrollbarHorizontalThumb:
         return blink::WebSize(kMinimumHorizontalLength, 15);
       case kPartScrollbarVerticalThumb:
         return blink::WebSize(15, kMinimumVerticalLength);
       default:
         return WebSize();
     }
   }
   static constexpr int kMinimumHorizontalLength = 51;
   static constexpr int kMinimumVerticalLength = 52;
 };

 constexpr int StubWebThemeEngine::kMinimumHorizontalLength;
 constexpr int StubWebThemeEngine::kMinimumVerticalLength;

 class ScrollbarTestingPlatformSupport : public TestingPlatformSupport {
  public:
   WebThemeEngine* ThemeEngine() override { return &stub_theme_engine_; }

  private:
   StubWebThemeEngine stub_theme_engine_;
 };

 // Test both overlay and non-overlay scrollbars.
 INSTANTIATE_TEST_CASE_P(All, ScrollbarAppearanceTest, ::testing::Bool());

 #if !defined(OS_MACOSX)
 // Ensure that the minimum length for a scrollbar thumb comes from the
 // WebThemeEngine. Note, Mac scrollbars differ from all other platforms so this
 // test doesn't apply there. https://crbug.com/682209.
 TEST_P(ScrollbarAppearanceTest, ThemeEngineDefinesMinimumThumbLength) {
   ScopedTestingPlatformSupport<ScrollbarTestingPlatformSupport> platform;

   v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
   WebView().Resize(WebSize(800, 600));
   SimRequest request("https://example.com/test.html", "text/html");
   LoadURL("https://example.com/test.html");
   request.Complete(
       "<style> body { width: 1000000px; height: 1000000px; } </style>");
   ScrollableArea* scrollable_area =
       GetDocument().View()->LayoutViewportScrollableArea();

   Compositor().BeginFrame();
   ASSERT_TRUE(scrollable_area->VerticalScrollbar());
   ASSERT_TRUE(scrollable_area->HorizontalScrollbar());

   ScrollbarTheme& theme = scrollable_area->VerticalScrollbar()->GetTheme();
   EXPECT_EQ(StubWebThemeEngine::kMinimumHorizontalLength,
             theme.ThumbLength(*scrollable_area->HorizontalScrollbar()));
   EXPECT_EQ(StubWebThemeEngine::kMinimumVerticalLength,
             theme.ThumbLength(*scrollable_area->VerticalScrollbar()));
 }
 #endif

 }  // namespace

 }  // namespace blink
	// Copyright 2016 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 "build/build_config.h"
	#include "core/frame/LocalFrameView.h"
	#include "core/frame/WebLocalFrameBase.h"
	#include "core/layout/LayoutView.h"
	#include "core/paint/PaintLayerScrollableArea.h"
	#include "core/testing/sim/SimDisplayItemList.h"
	#include "core/testing/sim/SimRequest.h"
	#include "core/testing/sim/SimTest.h"
	#include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
	#include "platform/testing/TestingPlatformSupport.h"
	#include "platform/testing/UnitTestHelpers.h"
	#include "public/platform/WebThemeEngine.h"
	#include "public/web/WebScriptSource.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace blink {

	namespace {

	class ScrollbarsTest : private ScopedRootLayerScrollingForTest, public SimTest {
	public:
	ScrollbarsTest() : ScopedRootLayerScrollingForTest(true) {}
	};

	TEST_F(ScrollbarsTest, DocumentStyleRecalcPreservesScrollbars) {
	v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
	WebView().Resize(WebSize(800, 600));
	SimRequest request("https://example.com/test.html", "text/html");
	LoadURL("https://example.com/test.html");
	request.Complete("<style> body { width: 1600px; height: 1200px; } </style>");
	PaintLayerScrollableArea* plsa =
	GetDocument().GetLayoutView()->GetScrollableArea();

	Compositor().BeginFrame();
	ASSERT_TRUE(plsa->VerticalScrollbar() && plsa->HorizontalScrollbar());

	// Forces recalc of LayoutView's computed style in Document::updateStyle,
	// without invalidating layout.
	MainFrame().ExecuteScriptAndReturnValue(WebScriptSource(
	"document.querySelector('style').sheet.insertRule('body {}', 1);"));

	Compositor().BeginFrame();
	ASSERT_TRUE(plsa->VerticalScrollbar() && plsa->HorizontalScrollbar());
	}

	// Ensure that causing a change in scrollbar existence causes a nested layout
	// to recalculate the existence of the opposite scrollbar. The bug here was
	// caused by trying to avoid the layout when overlays are enabled but not
	// checking whether the scrollbars should be custom - which do take up layout
	// space. https://crbug.com/668387.
	TEST_F(ScrollbarsTest, CustomScrollbarsCauseLayoutOnExistenceChange) {
	// The bug reproduces only with RLS off. When RLS ships we can keep the test
	// but remove this setting.
	ScopedRootLayerScrollingForTest turn_off_root_layer_scrolling(false);

	// This test is specifically checking the behavior when overlay scrollbars
	// are enabled.
	DCHECK(ScrollbarTheme::GetTheme().UsesOverlayScrollbars());

	WebView().Resize(WebSize(800, 600));
	SimRequest request("https://example.com/test.html", "text/html");
	LoadURL("https://example.com/test.html");
	request.Complete(
	"<!DOCTYPE html>"
	"<style>"
	" ::-webkit-scrollbar {"
	" height: 16px;"
	" width: 16px"
	" }"
	" ::-webkit-scrollbar-thumb {"
	" background-color: rgba(0,0,0,.2);"
	" }"
	" html, body{"
	" margin: 0;"
	" height: 100%;"
	" }"
	" .box {"
	" width: 100%;"
	" height: 100%;"
	" }"
	" .transformed {"
	" transform: translateY(100px);"
	" }"
	"</style>"
	"<div id='box' class='box'></div>");

	ScrollableArea* layout_viewport =
	GetDocument().View()->LayoutViewportScrollableArea();

	Compositor().BeginFrame();
	ASSERT_FALSE(layout_viewport->VerticalScrollbar());
	ASSERT_FALSE(layout_viewport->HorizontalScrollbar());

	// Adding translation will cause a vertical scrollbar to appear but not dirty
	// layout otherwise. Ensure the change of scrollbar causes a layout to
	// recalculate the page width with the vertical scrollbar added.
	MainFrame().ExecuteScript(WebScriptSource(
	"document.getElementById('box').className = 'box transformed';"));
	Compositor().BeginFrame();

	ASSERT_TRUE(layout_viewport->VerticalScrollbar());
	ASSERT_FALSE(layout_viewport->HorizontalScrollbar());
	}

	TEST_F(ScrollbarsTest, TransparentBackgroundUsesDarkOverlayColorTheme) {
	// The bug reproduces only with RLS off. When RLS ships we can keep the test
	// but remove this setting.
	ScopedRootLayerScrollingForTest turn_off_root_layer_scrolling(false);

	// This test is specifically checking the behavior when overlay scrollbars
	// are enabled.
	DCHECK(ScrollbarTheme::GetTheme().UsesOverlayScrollbars());

	WebView().Resize(WebSize(800, 600));
	WebView().SetBaseBackgroundColorOverride(SK_ColorTRANSPARENT);
	SimRequest request("https://example.com/test.html", "text/html");
	LoadURL("https://example.com/test.html");
	request.Complete(
	"<!DOCTYPE html>"
	"<style>"
	" body{"
	" height: 300%;"
	" }"
	"</style>");
	Compositor().BeginFrame();

	ScrollableArea* layout_viewport =
	GetDocument().View()->LayoutViewportScrollableArea();

	EXPECT_EQ(kScrollbarOverlayColorThemeDark,
	layout_viewport->GetScrollbarOverlayColorTheme());
	}

	typedef bool TestParamOverlayScrollbar;
	class ScrollbarAppearanceTest
	: public SimTest,
	public ::testing::WithParamInterface<TestParamOverlayScrollbar> {
	public:
	// Use real scrollbars to ensure we're testing the real ScrollbarThemes.
	ScrollbarAppearanceTest() : mock_scrollbars_(false, GetParam()) {}

	private:
	FrameTestHelpers::UseMockScrollbarSettings mock_scrollbars_;
	};

	class StubWebThemeEngine : public WebThemeEngine {
	public:
	WebSize GetSize(Part part) override {
	switch (part) {
	case kPartScrollbarHorizontalThumb:
	return blink::WebSize(kMinimumHorizontalLength, 15);
	case kPartScrollbarVerticalThumb:
	return blink::WebSize(15, kMinimumVerticalLength);
	default:
	return WebSize();
	}
	}
	static constexpr int kMinimumHorizontalLength = 51;
	static constexpr int kMinimumVerticalLength = 52;
	};

	constexpr int StubWebThemeEngine::kMinimumHorizontalLength;
	constexpr int StubWebThemeEngine::kMinimumVerticalLength;

	class ScrollbarTestingPlatformSupport : public TestingPlatformSupport {
	public:
	WebThemeEngine* ThemeEngine() override { return &stub_theme_engine_; }

	private:
	StubWebThemeEngine stub_theme_engine_;
	};

	// Test both overlay and non-overlay scrollbars.
	INSTANTIATE_TEST_CASE_P(All, ScrollbarAppearanceTest, ::testing::Bool());

	#if !defined(OS_MACOSX)
	// Ensure that the minimum length for a scrollbar thumb comes from the
	// WebThemeEngine. Note, Mac scrollbars differ from all other platforms so this
	// test doesn't apply there. https://crbug.com/682209.
	TEST_P(ScrollbarAppearanceTest, ThemeEngineDefinesMinimumThumbLength) {
	ScopedTestingPlatformSupport<ScrollbarTestingPlatformSupport> platform;

	v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
	WebView().Resize(WebSize(800, 600));
	SimRequest request("https://example.com/test.html", "text/html");
	LoadURL("https://example.com/test.html");
	request.Complete(
	"<style> body { width: 1000000px; height: 1000000px; } </style>");
	ScrollableArea* scrollable_area =
	GetDocument().View()->LayoutViewportScrollableArea();

	Compositor().BeginFrame();
	ASSERT_TRUE(scrollable_area->VerticalScrollbar());
	ASSERT_TRUE(scrollable_area->HorizontalScrollbar());

	ScrollbarTheme& theme = scrollable_area->VerticalScrollbar()->GetTheme();
	EXPECT_EQ(StubWebThemeEngine::kMinimumHorizontalLength,
	theme.ThumbLength(*scrollable_area->HorizontalScrollbar()));
	EXPECT_EQ(StubWebThemeEngine::kMinimumVerticalLength,
	theme.ThumbLength(*scrollable_area->VerticalScrollbar()));
	}
	#endif

	} // namespace

	} // namespace blink