Create MouseEventManager and EventHandlingUtil

third_party/WebKit/Source/core/input/EventHandlingUtil.cpp

+// 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 "core/input/EventHandlingUtil.h"
+
+#include "core/frame/FrameView.h"
+
+namespace blink {
+namespace EventHandlingUtil {
+
+HitTestResult hitTestResultInFrame(LocalFrame* frame, const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType)
+{
+    HitTestResult result(HitTestRequest(hitType), point);
+
+    if (!frame || frame->contentLayoutItem().isNull())
+        return result;
+    if (frame->view()) {
+        IntRect rect = frame->view()->visibleContentRect(IncludeScrollbars);
+        if (!rect.contains(roundedIntPoint(point)))
+            return result;
+    }
+    frame->contentLayoutItem().hitTest(result);
+    return result;
+}
+
+WebInputEventResult mergeEventResult(
+    WebInputEventResult resultA, WebInputEventResult resultB)
+{
+    // The ordering of the enumeration is specific. There are times that
+    // multiple events fire and we need to combine them into a single
+    // result code. The enumeration is based on the level of consumption that
+    // is most significant. The enumeration is ordered with smaller specified
+    // numbers first. Examples of merged results are:
+    // (HandledApplication, HandledSystem) -> HandledSystem
+    // (NotHandled, HandledApplication) -> HandledApplication
+    static_assert(static_cast<int>(WebInputEventResult::NotHandled) == 0, "WebInputEventResult not ordered");
+    static_assert(static_cast<int>(WebInputEventResult::HandledSuppressed) < static_cast<int>(WebInputEventResult::HandledApplication), "WebInputEventResult not ordered");
+    static_assert(static_cast<int>(WebInputEventResult::HandledApplication) < static_cast<int>(WebInputEventResult::HandledSystem), "WebInputEventResult not ordered");
+    return static_cast<WebInputEventResult>(max(static_cast<int>(resultA), static_cast<int>(resultB)));
+}
+
+WebInputEventResult toWebInputEventResult(
+    DispatchEventResult result)
+{
+    switch (result) {
+    case DispatchEventResult::NotCanceled:
+        return WebInputEventResult::NotHandled;
+    case DispatchEventResult::CanceledByEventHandler:
+        return WebInputEventResult::HandledApplication;
+    case DispatchEventResult::CanceledByDefaultEventHandler:
+        return WebInputEventResult::HandledSystem;
+    case DispatchEventResult::CanceledBeforeDispatch:
+        return WebInputEventResult::HandledSuppressed;
+    default:
+        NOTREACHED();
+        return WebInputEventResult::HandledSystem;
+    }
+}
+
+} // namespace EventHandlingUtil
+} // namespace blink