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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 "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 class.
// Subclasses can use |tree_id| when annotating their |AXNodeData| for clients
// to respond with the appropriate target node id.
class AX_EXPORT AXActionHandler {
virtual ~AXActionHandler();
// Handle an action from an accessibility client.
virtual void PerformAction(const AXActionData& data) = 0;
// Returns whether this handler expects points in pixels (true) or dips
// (false) for data passed to |PerformAction|.
virtual bool RequiresPerformActionPointInPixels() const;
// A tree id appropriate for annotating events sent to an accessibility
// client.
const AXTreeID& ax_tree_id() const { return tree_id_; };
// Register or unregister this class with |AXTreeIDRegistry|.
void UpdateActiveState(bool active);
// Automatically assigned.
AXTreeID tree_id_;
} // namespace ui