[InputEvent] Introduce |StaticRange| and use in |InputEvent::getRanges()|

third_party/WebKit/Source/core/dom/StaticRange.h

+// Copyright 2016 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.
+
+// https://discourse.wicg.io/t/proposal-staticrange-to-be-used-instead-of-range-for-new-apis/1472
+
+#ifndef StaticRange_h
+#define StaticRange_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Document;
+class ExceptionState;
+class Range;
+class ScriptState;
+
+class CORE_EXPORT StaticRange final : public GarbageCollected<StaticRange>, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+
+public:
+    static StaticRange* create()
+    {
+        return new StaticRange();
+    }
+    static StaticRange* create(Node* startContainer, int startOffset, Node* endContainer, int endOffset)
+    {
+        return new StaticRange(startContainer, startOffset, endContainer, endOffset);
+    }
+
+    Node* startContainer() const { return m_startContainer.get(); }
+    void setStartContainer(Node* startContainer) { m_startContainer = startContainer; }
+
+    int startOffset() const { return m_startOffset; }
+    void setStartOffset(int startOffset) { m_startOffset = startOffset; }
+
+    Node* endContainer() const { return m_endContainer.get(); }
+    void setEndContainer(Node* endContainer) { m_endContainer = endContainer; }
+
+    int endOffset() const { return m_endOffset; }
+    void setEndOffset(int endOffset) { m_endOffset = endOffset; }
+
+    bool collapsed() const { return m_startContainer == m_endContainer && m_startOffset == m_endOffset; }
+
+    void setStart(Node* container, int offset);
+    void setEnd(Node* container, int offset);
+
+    Range* toRange(ScriptState*, ExceptionState&) const;
+
+    DECLARE_TRACE();
+
+private:
+    friend class StaticRangeTest;
+    explicit StaticRange();

[dtapuska, 2016/06/02 15:26:29]

why explicit on non param constructor? doesn't make sense.

[chongz, 2016/06/06 19:43:43]

Added |Document&|.

+    StaticRange(Node* startContainer, int startOffset, Node* endContainer, int endOffset);
+
+    Range* toRangeImpl(Document&, ExceptionState&) const;
+
+    Member<Node> m_startContainer;

[dtapuska, 2016/06/02 15:26:29]

I guess my hope was that in the class structure

Range would extend a StaticRange.

Is that not possible?

[chongz, 2016/06/06 19:43:43]

garykac@ mentioned that there are concerns about changing |Range|, see
https://github.com/garykac/staticrange/issues/1#issuecomment-223659174

For now can we keep them separate and maybe merge later when decided?
Also currently |StaticRange| is |RuntimeEnabled=InputEvent|. 

+    int m_startOffset;
+    Member<Node> m_endContainer;
+    int m_endOffset;
+};
+
+using StaticRangeVector = HeapVector<Member<StaticRange>>;
+
+} // namespace blink
+
+#endif // StaticRange_h