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// Copyright 2018 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 THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_SELECTION_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_SELECTION_H_
#include <base/logging.h>
#include <stdint.h>
#include <ostream>
#include "third_party/blink/renderer/core/editing/forward.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.h"
namespace blink {
// If the |AXSelection| is defined by endpoints that are present in the
// accessibility tree but not in the DOM tree, determines whether setting the
// selection will shrink or extend the |AXSelection| to encompass endpoints that
// are in the DOM.
enum class AXSelectionBehavior {
kShrinkToValidDOMRange,
kExtendToValidDOMRange
};
class MODULES_EXPORT AXSelection final {
DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
public:
class Builder;
static const AXSelection FromSelection(
const SelectionInDOMTree&,
const AXSelectionBehavior = AXSelectionBehavior::kExtendToValidDOMRange);
AXSelection(const AXSelection&) = default;
AXSelection& operator=(const AXSelection&) = default;
~AXSelection() = default;
const AXPosition Base() const { return base_; }
const AXPosition Extent() const { return extent_; }
// The selection is invalid if either the anchor or the focus position is
// invalid, or if the positions are in two separate documents.
bool IsValid() const;
operator bool() const { return IsValid(); }
const SelectionInDOMTree AsSelection(
const AXSelectionBehavior =
AXSelectionBehavior::kExtendToValidDOMRange) const;
// Tries to set the DOM selection to this.
void Select(
const AXSelectionBehavior = AXSelectionBehavior::kExtendToValidDOMRange);
private:
AXSelection();
// The |AXPosition| where the selection starts.
AXPosition base_;
// The |AXPosition| where the selection ends.
AXPosition extent_;
#if DCHECK_IS_ON()
// TODO(accessibility): Use layout tree version in place of DOM and style
// versions.
uint64_t dom_tree_version_;
uint64_t style_version_;
#endif
friend class Builder;
};
class MODULES_EXPORT AXSelection::Builder final {
STACK_ALLOCATED();
public:
Builder() = default;
~Builder() = default;
Builder& SetBase(const AXPosition&);
Builder& SetBase(const Position&);
Builder& SetExtent(const AXPosition&);
Builder& SetExtent(const Position&);
Builder& SetSelection(const SelectionInDOMTree&);
const AXSelection Build();
private:
AXSelection selection_;
};
MODULES_EXPORT bool operator==(const AXSelection&, const AXSelection&);
MODULES_EXPORT bool operator!=(const AXSelection&, const AXSelection&);
MODULES_EXPORT std::ostream& operator<<(std::ostream&, const AXSelection&);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_ACCESSIBILITY_AX_SELECTION_H_
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