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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_RANGE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_RANGE_H_
#include <stdint.h>
#include <ostream>
#include "base/dcheck_is_on.h"
#include "third_party/blink/renderer/modules/accessibility/ax_position.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class AXObject;
class MODULES_EXPORT AXRange final {
DISALLOW_NEW();
public:
AXRange(const AXPosition& start, const AXPosition& end);
AXRange(const AXRange&) = default;
AXRange& operator=(const AXRange&) = default;
~AXRange() = default;
const AXPosition Start() const { return start_; }
const AXPosition End() const { return end_; }
// Returns the lowest common ancestor of the container objects of the start
// and end positions, or nullptr if the range is invalid.
AXObject* CommonAncestorContainer() const;
// The |AXRange| is collapsed if the start position is equal to the end
// position or if the range is invalid.
bool IsCollapsed() const;
// The range is invalid if either the start or end position is invalid, or if
// the positions are in two separate documents.
bool IsValid() const;
// Creates an |AXRange| encompassing the contents of the given |AXObject|.
static AXRange RangeOfContents(const AXObject&);
// Returns a string representation of this object.
String ToString() const;
private:
AXPosition start_;
AXPosition end_;
#if DCHECK_IS_ON()
// TODO(ax-dev): Use layout tree version in place of DOM and style versions.
uint64_t dom_tree_version_;
uint64_t style_version_;
#endif
};
MODULES_EXPORT bool operator==(const AXRange&, const AXRange&);
MODULES_EXPORT bool operator!=(const AXRange&, const AXRange&);
MODULES_EXPORT std::ostream& operator<<(std::ostream&, const AXRange&);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_RANGE_H_
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