Refactor DocumentMarkerController

third_party/WebKit/Source/core/editing/markers/DocumentMarkerList.h

+// Copyright 2017 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.
+
+#ifndef DocumentMarkerList_h
+#define DocumentMarkerList_h
+
+#include "core/editing/markers/DocumentMarker.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class DocumentMarkerController;
+
+class DocumentMarkerList : public GarbageCollected<DocumentMarkerList> {
+  WTF_MAKE_NONCOPYABLE(DocumentMarkerList);
+
+ public:
+  explicit DocumentMarkerList(DocumentMarkerController*);
+  using iterator = Member<DocumentMarker>*;
+  using const_iterator = const Member<DocumentMarker>*;
+
+  virtual DocumentMarker::MarkerType allowedMarkerType() const = 0;
+
+  virtual size_t size() const = 0;
+  virtual bool empty() const = 0;
+  virtual DocumentMarker* at(size_t index) = 0;
+
+  virtual void clear() = 0;
+
+  virtual iterator begin() = 0;
+  virtual iterator end() = 0;
+  virtual const_iterator begin() const = 0;
+  virtual const_iterator end() const = 0;
+
+  virtual void appendMarkersToInputList(DocumentMarkerVector* list) const = 0;
+  virtual bool copyMarkers(unsigned startOffset,
+                           int length,
+                           Node* dstNode,
+                           int delta) const = 0;
+  virtual void removeMarkers(unsigned startOffset,
+                             int length,
+                             bool shouldRemovePartiallyOverlappingMarkers,
+                             bool* didRemoveMarker) = 0;
+  virtual bool shiftMarkers(int startOffset, int delta) = 0;
+
+  DECLARE_VIRTUAL_TRACE();
+
+ protected:
+  struct ShiftMarkerResult {
+    unsigned newStartOffset;
+    unsigned newEndOffset;
+  };
+
+  static bool startsAfter(const Member<DocumentMarker>&, size_t startOffset);
+  static bool endsBefore(size_t startOffset, const Member<DocumentMarker>& rhv);
+  static bool compareByStart(const Member<DocumentMarker>& lhv,
+                             const Member<DocumentMarker>& rhv);
+
+  ShiftMarkerResult getShiftedMarkerPosition(const DocumentMarker&,
+                                             unsigned startOffset,
+                                             int delta);
+
+  Member<DocumentMarkerController> m_documentMarkerController;
+};
+
+}  // namespace blink
+
+#endif  // DocumentMarkerList_h