| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #pragma once |
| |
| #include <map> |
| |
| #include <fuchsia/modular/cpp/fidl.h> |
| |
| #include "flutter/fml/macros.h" |
| #include "flutter/lib/ui/semantics/semantics_node.h" |
| |
| namespace flutter { |
| |
| // Maintain an up-to-date list of SemanticsNodes on screen, and communicate |
| // with the Context Service. |
| class ContextWriterBridge final { |
| public: |
| ContextWriterBridge( |
| fidl::InterfaceHandle<fuchsia::modular::ContextWriter> writer); |
| |
| ~ContextWriterBridge(); |
| |
| // Update the internal representation of the semantics nodes, and write the |
| // semantics to Context Service. |
| void UpdateSemantics(const blink::SemanticsNodeUpdates& update); |
| |
| private: |
| fuchsia::modular::ContextWriterPtr writer_; |
| std::map<int, blink::SemanticsNode> semantics_nodes_; |
| |
| // Walk the semantics node tree starting at |id|, and store the id of each |
| // visited child in |visited_nodes|. |
| void UpdateVisitedForNodeAndChildren(const int id, |
| std::vector<int>* visited_nodes); |
| |
| // Remove any node from |semantics_nodes_| that doesn't have an id in |
| // |visited_nodes|. |
| void EraseUnvisitedNodes(const std::vector<int>& visited_nodes); |
| |
| FML_DISALLOW_COPY_AND_ASSIGN(ContextWriterBridge); |
| }; |
| |
| } // namespace flutter |