posinset and setsize for input type, radio, exposed in AX tree

third_party/WebKit/Source/modules/accessibility/AXRadioInput.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.
+
+
+#ifndef AXRadioInput_h
+#define AXRadioInput_h
+
+#include "modules/accessibility/AXLayoutObject.h"
+
+namespace blink {
+
+class AXObjectCacheImpl;
+class HTMLInputElement;
+
+class AXRadioInput final : public AXLayoutObject {
+
+public:
+    static AXRadioInput* create(LayoutObject*, AXObjectCacheImpl&);
+    ~AXRadioInput() override { }
+
+    bool isAXRadioInput() const override { return true; }
+    void updatePosAndSetSize(int position = 0);
+    void requestUpdateToNextNode(bool forward);
+    HTMLInputElement* findFirstRadioButtonInGroup(HTMLInputElement* current) const;
+
+    int posInSet() const final;
+    int setSize() const final;
+
+private:
+    AXRadioInput(LayoutObject*, AXObjectCacheImpl&);
+    bool calculatePosInSet();
+    HTMLInputElement* findNextRadioButtonInGroup(HTMLInputElement* current, bool forward) const;
+    int countFromFirstElement() const;
+    HTMLInputElement* element() const;
+    int sizeOfRadioGroup() const;
+
+    int m_posInSet;
+    int m_setSize;
+};
+
+DEFINE_AX_OBJECT_TYPE_CASTS(AXRadioInput, isAXRadioInput());
+
+} // namespace blink
+
+#endif // AXRadioInput_h
+