| // 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_ |