Add flutter_windows_view and window_binding_handler

Switch input handling infra to FlutterWindowsView

win32_flutter_window implement WindowBindingHandler

Strip unneeded functionality from win32flutterwindow

Fulfill WindowBindingHandler interface in Win32FlutterWindow

Add implementations for missing input handling in Win32FlutterWindow

Cleanup dead code

Correctly hook up rendering again

Fix resizing

clang-format

Fix clipboard

Cleanup

Rename

Add comments

cleanup

Author: clarkezone

shell/platform/windows/BUILD.gn

@@ -41,20 +41,23 @@ source_set("flutter_windows_source") {
   sources = [
     "angle_surface_manager.cc",
     "angle_surface_manager.h",
-    "dpi_utils.cc",
-    "dpi_utils.h",
     "flutter_windows.cc",
+    "flutter_windows_view.cc",
+    "flutter_windows_view.h",
     "key_event_handler.cc",
     "key_event_handler.h",
     "keyboard_hook_handler.h",
-    "platform_handler.cc",
-    "platform_handler.h",
     "string_conversion.cc",
     "string_conversion.h",
     "text_input_plugin.cc",
     "text_input_plugin.h",
+    "window_binding_handler.h",
+    "win32_dpi_utils.cc",
+    "win32_dpi_utils.h",
     "win32_flutter_window.cc",
     "win32_flutter_window.h",
+    "win32_platform_handler.cc",
+    "win32_platform_handler.h",
     "win32_task_runner.cc",
     "win32_task_runner.h",
     "win32_window.cc",
@@ -110,12 +113,12 @@ executable("flutter_windows_unittests") {
   testonly = true
 
   sources = [
-    "dpi_utils_unittests.cc",
     "string_conversion_unittests.cc",
     "testing/win32_flutter_window_test.cc",
     "testing/win32_flutter_window_test.h",
     "testing/win32_window_test.cc",
     "testing/win32_window_test.h",
+    "win32_dpi_utils_unittests.cc",
     "win32_flutter_window_unittests.cc",
     "win32_window_unittests.cc",
   ]

shell/platform/windows/angle_surface_manager.cc

@@ -169,8 +169,8 @@ void AngleSurfaceManager::CleanUp() {
   }
 }
 
-EGLSurface AngleSurfaceManager::CreateSurface(HWND window) {
-  if (!window || !initialize_succeeded_) {
+EGLSurface AngleSurfaceManager::CreateSurface(WindowsRenderTarget* render_target) {
+  if (!render_target || !initialize_succeeded_) {
     return EGL_NO_SURFACE;
   }
 
@@ -179,7 +179,7 @@ EGLSurface AngleSurfaceManager::CreateSurface(HWND window) {
   const EGLint surfaceAttributes[] = {EGL_NONE};
 
   surface = eglCreateWindowSurface(egl_display_, egl_config_,
-                                   static_cast<EGLNativeWindowType>(window),
+      static_cast<EGLNativeWindowType>(render_target->GetWindowHandle()),
                                    surfaceAttributes);
   if (surface == EGL_NO_SURFACE) {
     std::cerr << "Surface creation failed." << std::endl;

shell/platform/windows/angle_surface_manager.h

@@ -15,6 +15,8 @@
 // Windows platform specific includes
 #include <windows.h>
 
+#include "window_binding_handler.h"
+
 namespace flutter {
 
 // An manager for inializing ANGLE correctly and using it to create and
@@ -29,9 +31,9 @@ class AngleSurfaceManager {
   AngleSurfaceManager& operator=(const AngleSurfaceManager&) = delete;
 
   // Creates and returns an EGLSurface wrapper and backing DirectX 11 SwapChain
-  // asociated with window, in the appropriate format for display in a
-  // HWND-backed window.
-  EGLSurface CreateSurface(HWND window);
+  // asociated with window, in the appropriate format for display.
+  // Target represents the visual entity to bind to.
+  EGLSurface CreateSurface(WindowsRenderTarget* render_target);
 
   // queries EGL for the dimensions of surface in physical
   // pixels returning width and height as out params.

shell/platform/windows/flutter_windows.cc

@@ -19,13 +19,15 @@
 #include "flutter/shell/platform/common/cpp/incoming_message_dispatcher.h"
 #include "flutter/shell/platform/common/cpp/path_utils.h"
 #include "flutter/shell/platform/embedder/embedder.h"
-#include "flutter/shell/platform/windows/dpi_utils.h"
+#include "flutter/shell/platform/windows/flutter_windows_view.h"
 #include "flutter/shell/platform/windows/key_event_handler.h"
 #include "flutter/shell/platform/windows/keyboard_hook_handler.h"
-#include "flutter/shell/platform/windows/platform_handler.h"
 #include "flutter/shell/platform/windows/text_input_plugin.h"
+#include "flutter/shell/platform/windows/win32_dpi_utils.h"
 #include "flutter/shell/platform/windows/win32_flutter_window.h"
+#include "flutter/shell/platform/windows/win32_platform_handler.h"
 #include "flutter/shell/platform/windows/win32_task_runner.h"
+#include "flutter/shell/platform/windows/window_binding_handler.h"
 #include "flutter/shell/platform/windows/window_state.h"
 
 static_assert(FLUTTER_ENGINE_VERSION == 1, "");
@@ -66,7 +68,7 @@ UniqueAotDataPtr LoadAotData(std::filesystem::path aot_data_path) {
 // Returns the state object for the engine, or null on failure to start the
 // engine.
 static std::unique_ptr<FlutterDesktopEngineState> RunFlutterEngine(
-    flutter::Win32FlutterWindow* window,
+    flutter::FlutterWindowsView* view,
     const FlutterDesktopEngineProperties& engine_properties) {
   auto state = std::make_unique<FlutterDesktopEngineState>();
 
@@ -79,22 +81,22 @@ static std::unique_ptr<FlutterDesktopEngineState> RunFlutterEngine(
                 &engine_properties.switches[engine_properties.switches_count]);
   }
 
-  window->CreateRenderSurface();
+  view->CreateRenderSurface();
 
   // Provide the necessary callbacks for rendering within a win32 child window.
   FlutterRendererConfig config = {};
   config.type = kOpenGL;
   config.open_gl.struct_size = sizeof(config.open_gl);
   config.open_gl.make_current = [](void* user_data) -> bool {
-    auto host = static_cast<flutter::Win32FlutterWindow*>(user_data);
+    auto host = static_cast<flutter::FlutterWindowsView*>(user_data);
     return host->MakeCurrent();
   };
   config.open_gl.clear_current = [](void* user_data) -> bool {
-    auto host = static_cast<flutter::Win32FlutterWindow*>(user_data);
+    auto host = static_cast<flutter::FlutterWindowsView*>(user_data);
     return host->ClearContext();
   };
   config.open_gl.present = [](void* user_data) -> bool {
-    auto host = static_cast<flutter::Win32FlutterWindow*>(user_data);
+    auto host = static_cast<flutter::FlutterWindowsView*>(user_data);
     return host->SwapBuffers();
   };
   config.open_gl.fbo_callback = [](void* user_data) -> uint32_t { return 0; };
@@ -103,7 +105,7 @@ static std::unique_ptr<FlutterDesktopEngineState> RunFlutterEngine(
     return reinterpret_cast<void*>(eglGetProcAddress(what));
   };
   config.open_gl.make_resource_current = [](void* user_data) -> bool {
-    auto host = static_cast<flutter::Win32FlutterWindow*>(user_data);
+    auto host = static_cast<flutter::FlutterWindowsView*>(user_data);
     return host->MakeResourceCurrent();
   };
 
@@ -178,7 +180,7 @@ static std::unique_ptr<FlutterDesktopEngineState> RunFlutterEngine(
   args.platform_message_callback =
       [](const FlutterPlatformMessage* engine_message,
          void* user_data) -> void {
-    auto window = reinterpret_cast<flutter::Win32FlutterWindow*>(user_data);
+    auto window = reinterpret_cast<flutter::FlutterWindowsView*>(user_data);
     return window->HandlePlatformMessage(engine_message);
   };
   args.custom_task_runners = &custom_task_runners;
@@ -188,7 +190,7 @@ static std::unique_ptr<FlutterDesktopEngineState> RunFlutterEngine(
 
   FLUTTER_API_SYMBOL(FlutterEngine) engine = nullptr;
   auto result =
-      FlutterEngineRun(FLUTTER_ENGINE_VERSION, &config, &args, window, &engine);
+      FlutterEngineRun(FLUTTER_ENGINE_VERSION, &config, &args, view, &engine);
   if (result != kSuccess || engine == nullptr) {
     std::cerr << "Failed to start Flutter engine: error " << result
               << std::endl;
@@ -202,8 +204,12 @@ FlutterDesktopViewControllerRef FlutterDesktopCreateViewController(
     int width,
     int height,
     const FlutterDesktopEngineProperties& engine_properties) {
+  std::unique_ptr<flutter::FlutterWindowBindingHandler> window_wrapper =
+      std::make_unique<flutter::Win32FlutterWindow>(width, height);
+
   FlutterDesktopViewControllerRef state =
-      flutter::Win32FlutterWindow::CreateWin32FlutterWindow(width, height);
+      flutter::FlutterWindowsView::CreateFlutterWindowsView(
+          std::move(window_wrapper));
 
   auto engine_state = RunFlutterEngine(state->view.get(), engine_properties);
 
@@ -261,8 +267,8 @@ FlutterDesktopViewRef FlutterDesktopGetView(
   return controller->view_wrapper.get();
 }
 
-HWND FlutterDesktopViewGetHWND(FlutterDesktopViewRef view) {
-  return view->window->GetWindowHandle();
+HWND FlutterDesktopViewGetHWND(FlutterDesktopViewRef view_ref) {
+  return view_ref->view->GetRenderTarget()->GetWindowHandle();
 }
 
 UINT FlutterDesktopGetDpiForHWND(HWND hwnd) {
@@ -316,7 +322,7 @@ void FlutterDesktopRegistrarSetDestructionHandler(
 
 FlutterDesktopViewRef FlutterDesktopRegistrarGetView(
     FlutterDesktopPluginRegistrarRef registrar) {
-  return registrar->window;
+  return registrar->view;
 }
 
 bool FlutterDesktopMessengerSendWithReply(FlutterDesktopMessengerRef messenger,