[Reland] Refactor the selection code in EventHandler

Source/core/editing/SelectionController.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef AutoscrollController_h
-#define AutoscrollController_h
+#ifndef SelectionController_h
+#define SelectionController_h
 
 #include "core/CoreExport.h"
-#include "platform/geometry/IntPoint.h"
-#include "wtf/PassOwnPtr.h"
+#include "core/editing/TextGranularity.h"
+#include "core/page/EventWithHitTestResults.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
+class FrameSelection;
+class HitTestResult;
 class LocalFrame;
-class FrameView;
-class Node;
-class Page;
-class PlatformMouseEvent;
-class LayoutBox;
-class LayoutObject;
+class VisibleSelection;
 
-enum AutoscrollType {
-    NoAutoscroll,
-    AutoscrollForDragAndDrop,
-    AutoscrollForSelection,
-#if OS(WIN)
-    AutoscrollForPanCanStop,
-    AutoscrollForPan,
-#endif
-};
+class SelectionController final : public NoBaseWillBeGarbageCollected<SelectionController> {
+    WTF_MAKE_NONCOPYABLE(SelectionController);
+public:
+    static PassOwnPtrWillBeRawPtr<SelectionController> create(LocalFrame&);
+    DECLARE_TRACE();
 
-// AutscrollController handels autoscroll and pan scroll for EventHandler.
-class CORE_EXPORT AutoscrollController {
-public:
-    static PassOwnPtr<AutoscrollController> create(Page&);
+    bool updateSelectionForMouseDownDispatchingSelectStart(Node*, const VisibleSelection&, TextGranularity);
+    void handleMousePressEvent(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventSingleClick(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventDoubleClick(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventTripleClick(const MouseEventWithHitTestResults&);
+    void handleMouseDraggedEvent(const MouseEventWithHitTestResults&, const IntPoint&, const LayoutPoint&, Node*, const IntPoint&);
+    bool handleMouseReleaseEvent(const MouseEventWithHitTestResults&, const LayoutPoint&);
+    bool handlePasteGlobalSelection(const PlatformMouseEvent&);
+    bool handleGestureLongPress(const PlatformGestureEvent&, const HitTestResult&);
 
-    void animate(double monotonicFrameBeginTime);
-    bool autoscrollInProgress() const;
-    bool autoscrollInProgress(const LayoutBox*) const;
-    bool panScrollInProgress() const;
-    void startAutoscrollForSelection(LayoutObject*);
-    void stopAutoscroll();
-    void stopAutoscrollIfNeeded(LayoutObject*);
-    void updateAutoscrollLayoutObject();
-    void updateDragAndDrop(Node* targetNode, const IntPoint& eventPosition, double eventTime);
-#if OS(WIN)
-    void handleMouseReleaseForPanScrolling(LocalFrame*, const PlatformMouseEvent&);
-    void startPanScrolling(LayoutBox*, const IntPoint&);
-#endif
+    void updateSelectionForMouseDrag(Node*, const LayoutPoint&, const IntPoint&);
+    void updateSelectionForMouseDrag(const HitTestResult&, Node*, const LayoutPoint&, const IntPoint&);
+    void prepareForContextMenu(const MouseEventWithHitTestResults&, const LayoutPoint&);
+    void preparePassMousePressEventToSubframe(MouseEventWithHitTestResults&);
+
+    void initializeSelectionState();
+    void setMouseDownMayStartSelect(bool);
+    bool mouseDownMayStartSelect() const;
+    bool mouseDownWasSingleClickInSelection() const;
 
 private:
-    explicit AutoscrollController(Page&);
+    explicit SelectionController(LocalFrame&);
 
-    void startAutoscroll();
+    enum AppendTrailingWhitespace { ShouldAppendTrailingWhitespace, DontAppendTrailingWhitespace };
+    void selectClosestWordFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
+    void selectClosestMisspellingFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
+    void selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults&);
+    void selectClosestMisspellingFromMouseEvent(const MouseEventWithHitTestResults&);
+    void selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults&);
 
-#if OS(WIN)
-    void updatePanScrollState(FrameView*, const IntPoint& lastKnownMousePosition);
-#endif
 
-    Page& m_page;
-    LayoutBox* m_autoscrollLayoutObject;
-    AutoscrollType m_autoscrollType;
-    IntPoint m_dragAndDropAutoscrollReferencePosition;
-    double m_dragAndDropAutoscrollStartTime;
-#if OS(WIN)
-    IntPoint m_panScrollStartPos;
-#endif
+    RawPtrWillBeMember<LocalFrame> const m_frame;
+    bool m_mouseDownMayStartSelect;
+    bool m_mouseDownWasSingleClickInSelection;
+    enum SelectionInitiationState { HaveNotStartedSelection, PlacedCaret, ExtendedSelection };
+    SelectionInitiationState m_selectionInitiationState;
 };
 
 } // namespace blink
-
-#endif // AutoscrollController_h
+#endif // SelectionController_h