[Reland] Refactor the selection code in EventHandler

Source/core/input/EventHandler.h

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 #ifndef EventHandler_h
 #define EventHandler_h
 
 #include "core/CoreExport.h"
-#include "core/editing/TextGranularity.h"
 #include "core/events/TextEventInputType.h"
 #include "core/layout/HitTestRequest.h"
 #include "core/page/DragActions.h"
 #include "core/page/EventWithHitTestResults.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "platform/Cursor.h"
 #include "platform/PlatformMouseEvent.h"
 #include "platform/Timer.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/geometry/LayoutPoint.h"
@@ skipping 28 matching lines @@
 class Node;
 class OptionalCursor;
 class PlatformGestureEvent;
 class PlatformKeyboardEvent;
 class PlatformTouchEvent;
 class PlatformWheelEvent;
 class LayoutObject;
 class ScrollableArea;
 class Scrollbar;
 class ScrollState;
+class SelectionController;
 class TextEvent;
-class VisibleSelection;
 class WheelEvent;
 class Widget;
 
-enum AppendTrailingWhitespace { ShouldAppendTrailingWhitespace, DontAppendTrailingWhitespace };
 enum class DragInitiator;
 
 class CORE_EXPORT EventHandler : public NoBaseWillBeGarbageCollectedFinalized<EventHandler> {
     WTF_MAKE_NONCOPYABLE(EventHandler);
 public:
     explicit EventHandler(LocalFrame*);
     ~EventHandler();
     DECLARE_TRACE();
 
     void clear();
@@ skipping 96 matching lines @@
 
     bool handleTouchEvent(const PlatformTouchEvent&);
 
     bool useHandCursor(Node*, bool isOverLink);
 
     void notifyElementActivated();
 
     PassRefPtr<UserGestureToken> takeLastMouseDownGestureToken() { return m_lastMouseDownUserGestureToken.release(); }
 
     int clickCount() { return m_clickCount; }
-    bool mouseDownWasSingleClickInSelection() { return m_mouseDownWasSingleClickInSelection; }
+
+    SelectionController& selectionController() const { return *m_selectionController; }
 
 private:
     static DragState& dragState();
 
     DataTransfer* createDraggingDataTransfer() const;
 
-    bool updateSelectionForMouseDownDispatchingSelectStart(Node*, const VisibleSelection&, TextGranularity);
-    void selectClosestWordFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
-    void selectClosestMisspellingFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
-    void selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults&);
-    void selectClosestMisspellingFromMouseEvent(const MouseEventWithHitTestResults&);
-    void selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults&);
-
     bool handleMouseMoveOrLeaveEvent(const PlatformMouseEvent&, HitTestResult* hoveredNode = nullptr, bool onlyUpdateScrollbars = false, bool forceLeave = false);
     bool handleMousePressEvent(const MouseEventWithHitTestResults&);
-    bool handleMousePressEventSingleClick(const MouseEventWithHitTestResults&);
-    bool handleMousePressEventDoubleClick(const MouseEventWithHitTestResults&);
-    bool handleMousePressEventTripleClick(const MouseEventWithHitTestResults&);
     bool handleMouseFocus(const MouseEventWithHitTestResults&);
     bool handleMouseDraggedEvent(const MouseEventWithHitTestResults&);
     bool handleMouseReleaseEvent(const MouseEventWithHitTestResults&);
 
-    bool handlePasteGlobalSelection(const PlatformMouseEvent&);
-
     HitTestRequest::HitTestRequestType getHitTypeForGestureType(PlatformEvent::Type);
     void applyTouchAdjustment(PlatformGestureEvent*, HitTestResult*);
     bool handleGestureTap(const GestureEventWithHitTestResults&);
     bool handleGestureLongPress(const GestureEventWithHitTestResults&);
     bool handleGestureLongTap(const GestureEventWithHitTestResults&);
     bool handleGestureScrollUpdate(const PlatformGestureEvent&);
     bool handleGestureScrollBegin(const PlatformGestureEvent&);
     void clearGestureScrollState();
 
     bool shouldApplyTouchAdjustment(const PlatformGestureEvent&) const;
 
     OptionalCursor selectCursor(const HitTestResult&);
     OptionalCursor selectAutoCursor(const HitTestResult&, Node*, const Cursor& iBeam);
 
     void hoverTimerFired(Timer<EventHandler>*);
     void cursorUpdateTimerFired(Timer<EventHandler>*);
     void activeIntervalTimerFired(Timer<EventHandler>*);
 
-    bool mouseDownMayStartSelect() const { return m_mouseDownMayStartSelect; }
-
     void fakeMouseMoveEventTimerFired(Timer<EventHandler>*);
     void cancelFakeMouseMoveEvent();
     bool isCursorVisible() const;
     void updateCursor();
 
     ScrollableArea* associatedScrollableArea(const DeprecatedPaintLayer*) const;
 
     // Scrolls the elements of the DOM tree. Returns true if a node was scrolled.
     // False if we reached the root and couldn't scroll anything.
     // direction - The direction to scroll in. If this is a logical direction, it will be
@@ skipping 45 matching lines @@
 
     bool passMousePressEventToScrollbar(MouseEventWithHitTestResults&);
 
     bool passWheelEventToWidget(const PlatformWheelEvent&, Widget&);
     void defaultSpaceEventHandler(KeyboardEvent*);
     void defaultBackspaceEventHandler(KeyboardEvent*);
     void defaultTabEventHandler(KeyboardEvent*);
     void defaultEscapeEventHandler(KeyboardEvent*);
     void defaultArrowEventHandler(WebFocusType, KeyboardEvent*);
 
-    void updateSelectionForMouseDrag(const HitTestResult&);
-
     void updateLastScrollbarUnderMouse(Scrollbar*, bool);
 
     void setFrameWasScrolledByUser();
 
     bool capturesDragging() const { return m_capturesDragging; }
 
     bool handleGestureShowPress();
 
     bool handleScrollGestureOnResizer(Node*, const PlatformGestureEvent&);
 
@@ skipping 12 matching lines @@
 
     // NOTE: If adding a new field to this class please ensure that it is
     // cleared in |EventHandler::clear()|.
 
     LocalFrame* const m_frame;
 
     bool m_mousePressed;
     bool m_capturesDragging;
     RefPtrWillBeMember<Node> m_mousePressNode;
 
-    bool m_mouseDownMayStartSelect;
     bool m_mouseDownMayStartDrag;
-    bool m_mouseDownWasSingleClickInSelection;
-    enum SelectionInitiationState { HaveNotStartedSelection, PlacedCaret, ExtendedSelection };
-    SelectionInitiationState m_selectionInitiationState;
+    const OwnPtrWillBeMember<SelectionController> m_selectionController;
 
     LayoutPoint m_dragStartPos;
 
     Timer<EventHandler> m_hoverTimer;
 
     // TODO(rbyers): Mouse cursor update is page-wide, not per-frame.  Page-wide state
     // should move out of EventHandler to a new PageEventHandler class. crbug.com/449649
     Timer<EventHandler> m_cursorUpdateTimer;
 
     bool m_mouseDownMayStartAutoscroll;
@@ skipping 71 matching lines @@
     // scroll sequence in this frame, or any child frames. Only used
     // with ScrollCustomization. If some delta has been consumed, a
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 #endif // EventHandler_h