Refactor DocumentMarkerController

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

+// 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.
+
+#include "core/editing/markers/DocumentMarkerList.h"
+
+#include "core/editing/markers/DocumentMarkerController.h"
+
+namespace blink {
+
+DocumentMarkerList::DocumentMarkerList(
+    DocumentMarkerController* documentMarkerController)
+    : m_documentMarkerController(documentMarkerController) {}
+
+bool DocumentMarkerList::startsAfter(const Member<DocumentMarker>& marker,
+                                     size_t startOffset) {
+  return marker->startOffset() < startOffset;
+}
+
+bool DocumentMarkerList::endsBefore(size_t startOffset,
+                                    const Member<DocumentMarker>& rhv) {
+  return startOffset < rhv->endOffset();
+}
+
+bool DocumentMarkerList::compareByStart(const Member<DocumentMarker>& lhv,
+                                        const Member<DocumentMarker>& rhv) {
+  return lhv->startOffset() < rhv->startOffset();
+}
+
+DocumentMarkerList::ShiftMarkerResult
+DocumentMarkerList::getShiftedMarkerPosition(const DocumentMarker& marker,
+                                             unsigned startOffset,
+                                             int delta) {
+  ShiftMarkerResult result;
+  result.newStartOffset = marker.startOffset();
+  result.newEndOffset = marker.endOffset();
+
+  if (marker.startOffset() < startOffset)
+    return result;
+
+  DCHECK_GE(static_cast<int>(marker.startOffset()) + delta, 0);
+
+  result.newStartOffset += delta;
+  result.newEndOffset += delta;
+
+  return result;
+}
+
+DEFINE_TRACE(DocumentMarkerList) {
+  visitor->trace(m_documentMarkerController);
+}
+
+}  // namespace blink