Implement link selection on alt+mouse drag.

third_party/WebKit/Source/web/tests/SelectionTestBase.cpp

+// Copyright (c) 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 "web/tests/SelectionTestBase.h"
+
+#include "web/WebLocalFrameImpl.h"
+
+namespace blink {
+namespace {
+IntSize scaled(IntSize p, float scale)
+{
+    p.scale(scale, scale);
+    return p;
+}
+} // namespace
+
+void SelectionTestBase::emulateMouseDrag(const IntPoint& downPoint, const IntPoint& upPoint, int modifiers,
+    bool sendDownEvent, bool sendUpEvent)
+{
+    if (sendDownEvent) {
+        const auto& downEvent = FrameTestHelpers::createMouseEvent(WebMouseEvent::MouseDown, WebMouseEvent::ButtonLeft, downPoint, modifiers);
+        m_webView->handleInputEvent(downEvent);
+    }
+
+    static const int kMoveEventsNumber = 10;
+    static const float kMoveIncrementFraction = 1. / kMoveEventsNumber;
+    const auto& upDownVector = upPoint - downPoint;
+    for (int i = 0; i < kMoveEventsNumber; ++i) {
+        const auto& movePoint = downPoint + scaled(upDownVector, i * kMoveIncrementFraction);
+        const auto& moveEvent = FrameTestHelpers::createMouseEvent(WebMouseEvent::MouseMove, WebMouseEvent::ButtonLeft, movePoint, modifiers);
+        m_webView->handleInputEvent(moveEvent);
+    }
+
+    if (sendUpEvent) {
+        const auto& upEvent = FrameTestHelpers::createMouseEvent(WebMouseEvent::MouseUp, WebMouseEvent::ButtonLeft, upPoint, modifiers);
+        m_webView->handleInputEvent(upEvent);
+    }
+}
+
+void SelectionTestBase::emulateMouseClick(const IntPoint& clickPoint, WebMouseEvent::Button button, int modifiers, int count)
+{
+    auto event = FrameTestHelpers::createMouseEvent(WebMouseEvent::MouseDown, button, clickPoint, modifiers);
+    event.clickCount = count;
+    m_webView->handleInputEvent(event);
+    event.type = WebMouseEvent::MouseUp;
+    m_webView->handleInputEvent(event);
+}
+
+void SelectionTestBase::emulateMouseDown(const IntPoint& clickPoint, WebMouseEvent::Button button, int modifiers, int count)
+{
+    auto event = FrameTestHelpers::createMouseEvent(WebMouseEvent::MouseDown, button, clickPoint, modifiers);
+    event.clickCount = count;
+    m_webView->handleInputEvent(event);
+}
+
+std::string SelectionTestBase::getSelectionText()
+{
+    return m_mainFrame->selectionAsText().utf8();
+}
+} // namespace blink