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// 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 <oleacc.h>
#include <wrl/client.h>
#include <vector>
#include "base/compiler_specific.h"
#include "base/metrics/histogram_macros.h"
#include "base/observer_list.h"
#include "base/win/atl.h"
#include "third_party/iaccessible2/ia2_api_all.h"
#include "ui/accessibility/ax_export.h"
#include "ui/accessibility/ax_text_utils.h"
#include "ui/accessibility/platform/ax_platform_node_win.h"
namespace ui {
// AXPlatformRelationWin
// A simple implementation of IAccessibleRelation, used to represent a
// relationship between one accessible node in the tree and
// potentially multiple target nodes. Also contains a utility function
// to compute all of the possible IAccessible2 relations and reverse
// relations given the internal relation id attributes.
class AXPlatformRelationWin : public CComObjectRootEx<CComMultiThreadModel>,
public IAccessibleRelation {
virtual ~AXPlatformRelationWin();
// This is the main utility function that enumerates all of the possible
// IAccessible2 relations between one node and any other node in the tree.
// Forward relations come from the int_attributes and intlist_attributes
// in node_data. Reverse relations come from querying |delegate| for the
// reverse relations given ||.
// If you pass -1 for |desired_index| and "" for |desired_ia2_relation|,
// it will return a count of all relations.
// If you pass either an index in |desired_index| or a specific relation
// in |desired_ia2_relation|, the first matching relation will be returned in
// |out_ia2_relation| and |out_targets| (both of which must not be null),
// and it will return 1 on success, and 0 if none were found matching that
// criteria.
static int EnumerateRelationships(const AXNodeData& node_data,
AXPlatformNodeDelegate* delegate,
int desired_index,
const base::string16& desired_ia2_relation,
base::string16* out_ia2_relation,
std::set<int32_t>* out_targets);
void Initialize(const base::string16& type);
void Invalidate();
void AddTarget(AXPlatformNodeWin* target);
// IAccessibleRelation methods.
IFACEMETHODIMP get_relationType(BSTR* relation_type) override;
IFACEMETHODIMP get_nTargets(LONG* n_targets) override;
IFACEMETHODIMP get_target(LONG target_index, IUnknown** target) override;
IFACEMETHODIMP get_targets(LONG max_targets,
IUnknown** targets,
LONG* n_targets) override;
IFACEMETHODIMP get_localizedRelationType(BSTR* relation_type) override;
base::string16 type_;
std::vector<Microsoft::WRL::ComPtr<AXPlatformNodeWin>> targets_;
} // namespace ui