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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.
#ifndef UI_ACCESSIBILITY_AX_HOST_DELEGATE_H_
#define UI_ACCESSIBILITY_AX_HOST_DELEGATE_H_
#include "ui/accessibility/ax_export.h"
#include "ui/accessibility/ax_tree_id.h"
namespace ui {
struct AXActionData;
// Classes that host an accessibility tree in the browser process that also wish
// to become visible to accessibility clients (e.g. for relaying targets to
// source accessibility trees), can subclass this delegate.
//
// Subclasses can use |tree_id| when annotating their |AXNodeData| for clients
// to respond with the appropriate target node id.
class AX_EXPORT AXHostDelegate {
public:
virtual ~AXHostDelegate();
// Handle an action from an accessibility client.
virtual void PerformAction(const ui::AXActionData& data) = 0;
// A tree id appropriate for annotating events sent to an accessibility
// client.
AXTreeID tree_id() const { return tree_id_; }
protected:
// A delegate with an automatically assigned tree id.
AXHostDelegate();
// A delegate with an explicit tree id. The caller is responsible for ensuring
// the uniqueness of the id.
explicit AXHostDelegate(AXTreeID tree_id);
private:
// Register or unregister this class with |AXTreeIDRegistry|.
void UpdateActiveState(bool active);
AXTreeID tree_id_;
};
} // namespace ui
#endif // UI_ACCESSIBILITY_AX_HOST_DELEGATE_H_