Extract more of the mouse logic from EventHandler

third_party/WebKit/Source/core/input/MouseEventManager.h

Index: third_party/WebKit/Source/core/input/MouseEventManager.h
diff --git a/third_party/WebKit/Source/core/input/MouseEventManager.h b/third_party/WebKit/Source/core/input/MouseEventManager.h
index c915ee4a4d6ab72220e1a17ebf45583ec41f4d0a..9b82010bfa346e6ff6eeee4d4f2ec3460307ec7d 100644
--- a/third_party/WebKit/Source/core/input/MouseEventManager.h
+++ b/third_party/WebKit/Source/core/input/MouseEventManager.h
@@ -6,15 +6,26 @@
 #define MouseEventManager_h
 
 #include "core/CoreExport.h"
-#include "core/frame/LocalFrame.h"
 #include "core/input/BoundaryEventDispatcher.h"
+#include "core/page/DragActions.h"
+#include "core/page/EventWithHitTestResults.h"
 #include "platform/PlatformMouseEvent.h"
+#include "platform/Timer.h"
 #include "public/platform/WebInputEventResult.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
+class DragState;
+class DataTransfer;
+class Element;
+class FloatQuad;
+class HitTestResult;
+class InputDeviceCapabilities;
 class LocalFrame;
+class ScrollManager;
+
+enum class DragInitiator;
 
 // This class takes care of dispatching all mouse events and keeps track of
 // positions and states of mouse.
@@ -23,16 +34,30 @@ class CORE_EXPORT MouseEventManager
   WTF_MAKE_NONCOPYABLE(MouseEventManager);
 
  public:
-  explicit MouseEventManager(LocalFrame*);
+  MouseEventManager(LocalFrame*, ScrollManager*);
   DECLARE_TRACE();
 
   WebInputEventResult dispatchMouseEvent(EventTarget*,
                                          const AtomicString&,
                                          const PlatformMouseEvent&,
                                          EventTarget* relatedTarget,
-                                         int detail = 0,
                                          bool checkForListener = false);
 
+  WebInputEventResult setMousePositionAndDispatchMouseEvent(
+      Node* targetNode,
+      const AtomicString& eventType,
+      const PlatformMouseEvent&);
+
+  WebInputEventResult dispatchMouseClickIfNeeded(
+      const MouseEventWithHitTestResults&);
+
+  WebInputEventResult dispatchDragSrcEvent(const AtomicString& eventType,
+                                           const PlatformMouseEvent&);
+  WebInputEventResult dispatchDragEvent(const AtomicString& eventType,
+                                        Node* target,
+                                        const PlatformMouseEvent&,
+                                        DataTransfer*);
+
   // Resets the internal state of this object.
   void clear();
 
@@ -40,6 +65,74 @@ class CORE_EXPORT MouseEventManager
                           EventTarget* enteredTarget,
                           const PlatformMouseEvent& mousePlatformEvent);
 
+  void setNodeUnderMouse(Node*, const PlatformMouseEvent&);
+
+  WebInputEventResult handleMouseFocus(
+      const HitTestResult&,
+      InputDeviceCapabilities* sourceCapabilities);
+
+  void fakeMouseMoveEventTimerFired(TimerBase*);
+
+  void cancelFakeMouseMoveEvent();
+  void dispatchFakeMouseMoveEventSoon();
+  void dispatchFakeMouseMoveEventSoonInQuad(const FloatQuad&);
+
+  void setLastKnownMousePosition(const PlatformMouseEvent&);
+
+  bool handleDragDropIfPossible(const GestureEventWithHitTestResults&);
+
+  WebInputEventResult handleMouseDraggedEvent(
+      const MouseEventWithHitTestResults&);
+  WebInputEventResult handleMousePressEvent(
+      const MouseEventWithHitTestResults&);
+  WebInputEventResult handleMouseReleaseEvent(
+      const MouseEventWithHitTestResults&);
+
+  void nodeWillBeRemoved(Node& nodeToBeRemoved);
+
+  static DragState& dragState();
+
+  void focusDocumentView();
+
+  // Resets the state that indicates the next events could cause a drag. It is called when
+  // we realize the next events should not cause drag based on the drag heuristics.
+  void clearDragHeuristicState();
+
+  void dragSourceEndedAt(const PlatformMouseEvent&, DragOperation);
+
+  void updateSelectionForMouseDrag();
+
+  void handleMousePressEventUpdateStates(const PlatformMouseEvent&);
+
+  // Returns whether pan is handled and resets the state on release.
+  bool handleSvgPanIfNeeded(bool isReleaseEvent);
+
+  void invalidateClick();
+
+  // TODO: These functions ideally should be private but the code needs more
+  // refactoring to be able to remove the dependency from EventHandler.
+  Node* getNodeUnderMouse();
+  bool isMousePositionUnknown();
+  IntPoint lastKnownMousePosition();
+
+  bool mousePressed();
+  void setMousePressed(bool);
+
+  bool capturesDragging() const;
+  void setCapturesDragging(bool);
+
+  void setMouseDownMayStartAutoscroll() {
+    m_mouseDownMayStartAutoscroll = true;
+  }
+
+  Node* mousePressNode();
+  void setMousePressNode(Node*);
+
+  void setClickNode(Node*);
+  void setClickCount(int);
+
+  bool mouseDownMayStartDrag();
+
  private:
   class MouseEventBoundaryEventDispatcher : public BoundaryEventDispatcher {
     WTF_MAKE_NONCOPYABLE(MouseEventBoundaryEventDispatcher);
@@ -72,14 +165,53 @@ class CORE_EXPORT MouseEventManager
     Member<EventTarget> m_exitedTarget;
   };
 
+  // If the given element is a shadow host and its root has delegatesFocus=false flag,
+  // slide focus to its inner element. Returns true if the resulting focus is different from
+  // the given element.
+  bool slideFocusOnShadowHostIfNecessary(const Element&);
+
+  bool dragHysteresisExceeded(const IntPoint&) const;
+  bool handleDrag(const MouseEventWithHitTestResults&, DragInitiator);
+  bool tryStartDrag(const MouseEventWithHitTestResults&);
+  void clearDragDataTransfer();
+  DataTransfer* createDraggingDataTransfer() const;
+
   // NOTE: If adding a new field to this class please ensure that it is
   // cleared in |MouseEventManager::clear()|.
 
   const Member<LocalFrame> m_frame;
+  Member<ScrollManager> m_scrollManager;
 
   // The effective position of the mouse pointer.
   // See https://w3c.github.io/pointerevents/#dfn-tracking-the-effective-position-of-the-legacy-mouse-pointer.
   Member<Node> m_nodeUnderMouse;
+
+  // The last mouse movement position this frame has seen in root frame coordinates.
+  IntPoint m_lastKnownMousePosition;
+  IntPoint m_lastKnownMouseGlobalPosition;
+
+  unsigned m_isMousePositionUnknown : 1;
+  // Current button-press state for mouse/mouse-like-stylus.
+  // TODO(crbug.com/563676): Buggy for chorded buttons.
+  unsigned m_mousePressed : 1;
+
+  unsigned m_mouseDownMayStartAutoscroll : 1;
+  unsigned m_svgPan : 1;
+  unsigned m_capturesDragging : 1;
+  unsigned m_mouseDownMayStartDrag : 1;
+
+  Member<Node> m_mousePressNode;
+
+  int m_clickCount;
+  Member<Node> m_clickNode;
+
+  IntPoint m_mouseDownPos;  // In our view's coords.
+  double m_mouseDownTimestamp;
+  PlatformMouseEvent m_mouseDown;
+
+  LayoutPoint m_dragStartPos;
+
+  Timer<MouseEventManager> m_fakeMouseMoveEventTimer;
 };
 
 }  // namespace blink