platform_view_embedder.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_EMBEDDER_PLATFORM_VIEW_EMBEDDER_H_
#define FLUTTER_SHELL_PLATFORM_EMBEDDER_PLATFORM_VIEW_EMBEDDER_H_
 
#include <functional>
 
#include "flow/embedded_views.h"
#include "flutter/fml/macros.h"
#include "flutter/shell/common/platform_view.h"
#include "flutter/shell/platform/embedder/embedder.h"
#include "flutter/shell/platform/embedder/embedder_surface.h"
#include "flutter/shell/platform/embedder/embedder_surface_software.h"
#include "flutter/shell/platform/embedder/vsync_waiter_embedder.h"
 
#ifdef SHELL_ENABLE_GL
#include "flutter/shell/platform/embedder/embedder_surface_gl_impeller.h"
#include "flutter/shell/platform/embedder/embedder_surface_gl_skia.h"
#endif
 
#ifdef SHELL_ENABLE_METAL
#include "flutter/shell/platform/embedder/embedder_surface_metal_skia.h"
#endif
 
#ifdef SHELL_ENABLE_VULKAN
#include "flutter/shell/platform/embedder/embedder_surface_vulkan.h"
#ifdef IMPELLER_SUPPORTS_RENDERING
#include "flutter/shell/platform/embedder/embedder_surface_vulkan_impeller.h"
#endif  // IMPELLER_SUPPORTS_RENDERING
#endif
 
namespace flutter {
 
class PlatformViewEmbedder final : public PlatformView {
 public:
  using UpdateSemanticsCallback =
      std::function<void(int64_t view_id,
                         flutter::SemanticsNodeUpdates update,
                         flutter::CustomAccessibilityActionUpdates actions)>;
  using PlatformMessageResponseCallback =
      std::function<void(std::unique_ptr<PlatformMessage>)>;
  using ComputePlatformResolvedLocaleCallback =
      std::function<std::unique_ptr<std::vector<std::string>>(
          const std::vector<std::string>& supported_locale_data)>;
  using OnPreEngineRestartCallback = std::function<void()>;
  using ChanneUpdateCallback = std::function<void(const std::string&, bool)>;
  using ViewFocusChangeRequestCallback =
      std::function<void(const ViewFocusChangeRequest&)>;
 
  struct PlatformDispatchTable {
    UpdateSemanticsCallback update_semantics_callback;  // optional
    PlatformMessageResponseCallback
        platform_message_response_callback;             // optional
    VsyncWaiterEmbedder::VsyncCallback vsync_callback;  // optional
    ComputePlatformResolvedLocaleCallback
        compute_platform_resolved_locale_callback;
    OnPreEngineRestartCallback on_pre_engine_restart_callback;  // optional
    ChanneUpdateCallback on_channel_update;                     // optional
    ViewFocusChangeRequestCallback
        view_focus_change_request_callback;  // optional
  };
 
  // Create a platform view that sets up a software rasterizer.
  PlatformViewEmbedder(
      PlatformView::Delegate& delegate,
      const flutter::TaskRunners& task_runners,
      const EmbedderSurfaceSoftware::SoftwareDispatchTable&
          software_dispatch_table,
      PlatformDispatchTable platform_dispatch_table,
      std::shared_ptr<EmbedderExternalViewEmbedder> external_view_embedder);
 
#ifdef SHELL_ENABLE_GL
  // Creates a platform view that sets up an OpenGL rasterizer.
  PlatformViewEmbedder(
      PlatformView::Delegate& delegate,
      const flutter::TaskRunners& task_runners,
      std::unique_ptr<EmbedderSurface> embedder_surface,
      PlatformDispatchTable platform_dispatch_table,
      std::shared_ptr<EmbedderExternalViewEmbedder> external_view_embedder);
#endif
 
#ifdef SHELL_ENABLE_METAL
  // Creates a platform view that sets up an metal rasterizer.
  PlatformViewEmbedder(
      PlatformView::Delegate& delegate,
      const flutter::TaskRunners& task_runners,
      std::unique_ptr<EmbedderSurface> embedder_surface,
      PlatformDispatchTable platform_dispatch_table,
      std::shared_ptr<EmbedderExternalViewEmbedder> external_view_embedder);
#endif
 
#ifdef SHELL_ENABLE_VULKAN
  // Creates a platform view that sets up an Vulkan rasterizer.
  PlatformViewEmbedder(
      PlatformView::Delegate& delegate,
      const flutter::TaskRunners& task_runners,
      std::unique_ptr<EmbedderSurfaceVulkan> embedder_surface,
      PlatformDispatchTable platform_dispatch_table,
      std::shared_ptr<EmbedderExternalViewEmbedder> external_view_embedder);
#endif
 
  ~PlatformViewEmbedder() override;
 
  // |PlatformView|
  void UpdateSemantics(
      int64_t view_id,
      flutter::SemanticsNodeUpdates update,
      flutter::CustomAccessibilityActionUpdates actions) override;
 
  // |PlatformView|
  void HandlePlatformMessage(std::unique_ptr<PlatformMessage> message) override;
 
  // |PlatformView|
  std::shared_ptr<PlatformMessageHandler> GetPlatformMessageHandler()
      const override;
 
 private:
  class EmbedderPlatformMessageHandler;
  std::shared_ptr<EmbedderExternalViewEmbedder> external_view_embedder_;
  std::unique_ptr<EmbedderSurface> embedder_surface_;
  std::shared_ptr<EmbedderPlatformMessageHandler> platform_message_handler_;
  PlatformDispatchTable platform_dispatch_table_;
 
  // |PlatformView|
  std::unique_ptr<Surface> CreateRenderingSurface() override;
 
  // |PlatformView|
  std::shared_ptr<ExternalViewEmbedder> CreateExternalViewEmbedder() override;
 
  // |PlatformView|
  std::shared_ptr<impeller::Context> GetImpellerContext() const override;
 
  // |PlatformView|
  sk_sp<GrDirectContext> CreateResourceContext() const override;
 
  // |PlatformView|
  std::unique_ptr<VsyncWaiter> CreateVSyncWaiter() override;
 
  // |PlatformView|
  void OnPreEngineRestart() const override;
 
  // |PlatformView|
  std::unique_ptr<std::vector<std::string>> ComputePlatformResolvedLocales(
      const std::vector<std::string>& supported_locale_data) override;
 
  // |PlatformView|
  void SendChannelUpdate(const std::string& name, bool listening) override;
 
  // |PlatformView|
  void RequestViewFocusChange(const ViewFocusChangeRequest& request) override;
 
  FML_DISALLOW_COPY_AND_ASSIGN(PlatformViewEmbedder);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_EMBEDDER_PLATFORM_VIEW_EMBEDDER_H_