[Reland] Refactor the selection code in EventHandler

Source/core/page/EventHandlerTest.cpp

+// Copyright 2015 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 "config.h"
+#include "core/page/EventHandler.h"
+
+#include "core/dom/Document.h"
+#include "core/dom/Range.h"
+#include "core/editing/FrameSelection.h"
+#include "core/frame/FrameView.h"
+#include "core/frame/LocalFrame.h"
+#include "core/html/HTMLDocument.h"
+#include "core/page/AutoscrollController.h"
+#include "core/page/Page.h"
+#include "core/testing/CoreTestHelpers.h"
+#include "core/testing/DummyPageHolder.h"
+#include "platform/PlatformMouseEvent.h"
+#include <gtest/gtest.h>
+
+namespace blink {
+
+class EventHandlerTest : public ::testing::Test {
+protected:
+    virtual void SetUp() override;
+
+    Page& page() const { return m_dummyPageHolder->page(); }
+    Document& document() const { return m_dummyPageHolder->document(); }
+
+    void setHtmlInnerHTML(const char* htmlContent);
+
+private:
+    OwnPtr<DummyPageHolder> m_dummyPageHolder;
+};
+
+void EventHandlerTest::SetUp()
+{
+    m_dummyPageHolder = DummyPageHolder::create(IntSize(300, 400));
+}
+
+void EventHandlerTest::setHtmlInnerHTML(const char* htmlContent)
+{
+    document().documentElement()->setInnerHTML(String::fromUTF8(htmlContent), ASSERT_NO_EXCEPTION);
+    document().view()->updateLayoutAndStyleForPainting();
+}
+
+TEST_F(EventHandlerTest, dragSelectionAfterScroll)
+{
+    setHtmlInnerHTML("<style> body { margin: 0px; } .upper { width: 300px; height: 400px; }"
+        ".lower { margin: 0px; width: 300px; height: 400px; } .line { display: block; width: 300px; height: 30px; } </style>"
+        "<div class=\"upper\"></div>"
+        "<div class=\"lower\">"
+        "<span class=\"line\">Line 1</span><span class=\"line\">Line 2</span><span class=\"line\">Line 3</span><span class=\"line\">Line 4</span><span class=\"line\">Line 5</span>"
+        "<span class=\"line\">Line 6</span><span class=\"line\">Line 7</span><span class=\"line\">Line 8</span><span class=\"line\">Line 9</span><span class=\"line\">Line 10</span>"
+        "</div>");
+
+    FrameView* frameView = document().view();
+    frameView->scrollTo(DoublePoint(0, 400));
+
+    PlatformMouseEvent mouseDownEvent(
+        IntPoint(0, 0),
+        IntPoint(100, 200),
+        LeftButton,
+        PlatformEvent::MousePressed,
+        1,
+        static_cast<PlatformEvent::Modifiers>(0),
+        WTF::currentTime());
+    document().frame()->eventHandler().handleMousePressEvent(mouseDownEvent);
+
+    PlatformMouseEvent mouseMoveEvent(
+        IntPoint(100, 50),
+        IntPoint(200, 250),
+        LeftButton,
+        PlatformEvent::MouseMoved,
+        1,
+        static_cast<PlatformEvent::Modifiers>(0),
+        WTF::currentTime());
+    document().frame()->eventHandler().handleMouseMoveEvent(mouseMoveEvent);
+
+    page().autoscrollController().animate(WTF::currentTime());
+    page().animator().serviceScriptedAnimations(WTF::currentTime());
+
+    PlatformMouseEvent mouseUpEvent(
+        IntPoint(100, 50),
+        IntPoint(200, 250),
+        LeftButton,
+        PlatformEvent::MouseReleased,
+        1,
+        static_cast<PlatformEvent::Modifiers>(0),
+        WTF::currentTime());
+    document().frame()->eventHandler().handleMouseReleaseEvent(mouseUpEvent);
+
+    FrameSelection& selection = document().frame()->selection();
+    ASSERT_TRUE(selection.isRange());
+    RefPtrWillBeRawPtr<Range> range = selection.toNormalizedRange();
+    ASSERT_TRUE(range.get());
+    EXPECT_EQ("Line 1\nLine 2", range->text());
+}
+
+} // namespace blink