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// Copyright 2014 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 <map>
#include <utility>
#include "base/macros.h"
#include "ui/accessibility/ax_export.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
} // namespace base
namespace ui {
class AXHostDelegate;
// This class generates and saves a runtime id for an accessibility tree.
// It provides a few distinct forms of generating an id:
// - from a frame id (which consists of a process and routing id)
// - from a backing |AXHostDelegate| object
// The first form allows underlying instances to change but refer to the same
// frame.
// The second form allows this registry to track the object for later retrieval.
class AX_EXPORT AXTreeIDRegistry {
using FrameID = std::pair<int, int>;
using AXTreeID = int;
static constexpr AXTreeID kNoAXTreeID = -1;
// Get the single instance of this class.
static AXTreeIDRegistry* GetInstance();
// Methods for FrameID ax tree id generation, and retrieval.
AXTreeID GetOrCreateAXTreeID(int process_id, int routing_id);
FrameID GetFrameID(AXTreeID ax_tree_id);
// Retrieve an |AXHostDelegate|.
AXHostDelegate* GetHostDelegate(AXTreeID ax_tree_id);
void RemoveAXTreeID(AXTreeID ax_tree_id);
friend struct base::DefaultSingletonTraits<AXTreeIDRegistry>;
friend AXHostDelegate;
// Methods for AXHostDelegate ax tree id generation.
AXTreeID GetOrCreateAXTreeID(AXHostDelegate* delegate);
void SetDelegateForID(AXHostDelegate* delegate, AXTreeID id);
virtual ~AXTreeIDRegistry();
// Tracks the current unique ax frame id.
AXTreeID ax_tree_id_counter_;
// Maps an accessibility tree to its frame via ids.
std::map<AXTreeID, FrameID> ax_tree_to_frame_id_map_;
// Maps frames to an accessibility tree via ids.
std::map<FrameID, AXTreeID> frame_to_ax_tree_id_map_;
// Maps an id to its host delegate.
std::map<AXTreeID, AXHostDelegate*> id_to_host_delegate_;
} // namespace ui