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windows/runner/flutter_window.cpp

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+#include "flutter_window.h"
+
+#include <optional>
+
+#include <flutter/generated_plugin_registrant.h>
+#include <flutter/method_channel.h>
+#include <flutter/standard_method_codec.h>
+
+#include <windows.h>
+#include <iostream>
+
+static HHOOK g_hHook = nullptr;
+
+constexpr wchar_t kFlutterTitleName[] = L"Desktop";
+
+FlutterWindow* g_flutter_window = nullptr;
+
+enum KeyState {
+  kNone,
+  kWinPressed,
+  kOtherKeyPressed
+};
+
+KeyState g_keyState = kNone;
+
+bool g_isLeftShiftPressed = false;
+bool g_isRightShiftPressed = false;
+
+void UpdateShiftState(UINT vkCode, bool isKeyDown) {
+  if (vkCode == VK_LSHIFT) {
+    g_isLeftShiftPressed = isKeyDown;
+  } else if (vkCode == VK_RSHIFT) {
+    g_isRightShiftPressed = isKeyDown;
+  }
+}
+
+bool IsShiftPressed() {
+  return g_isLeftShiftPressed || g_isRightShiftPressed;
+}
+
+int GetFlutterKeyId(UINT vkCode) {
+  bool shiftPressed = IsShiftPressed();
+//  std::wcout << L"[GetFlutterKeyId] shiftPressed=" << shiftPressed
+//                   << L", vkCode=" << vkCode
+//                   << L"\n" << std::flush;
+
+  if(shiftPressed) {
+    if (vkCode >= 0x41 && vkCode <= 0x5A) {
+        return vkCode + 0x20; // 'A' = 0x0041
+    }
+
+    if (vkCode >= 0x61 && vkCode <= 0x7A) {
+        return vkCode - 0x20; // 'a' ~ 'z'
+    }
+  } else {
+    if (vkCode >= 0x41 && vkCode <= 0x5A) {
+        return vkCode; // 'A' ~ 'Z' = 0x0041
+    }
+
+    if (vkCode >= 0x61 && vkCode <= 0x7A) {
+        return vkCode; // 'a' ~ 'z'
+    }
+  }
+
+  if (vkCode >= 0x30 && vkCode <= 0x39) return vkCode; // '0'~'9'
+
+
+  if (vkCode >= 0x60 && vkCode <= 0x69) {
+    return 0xFFB0 + (vkCode - 0x60);
+  }
+
+  if (vkCode >= 0x70 && vkCode <= 0x7B) {
+    return 0xFFBE + (vkCode - 0x70);
+  }
+
+  switch (vkCode) {
+    // Modifier Keys
+      case 0x25: return 0xFF51; // Left
+      case 0x26: return 0xFF52; // Up
+      case 0x27: return 0xFF53; // Right
+      case 0x28: return 0xFF54; // Down
+
+      case 0x08: return 0xFF08; // Backspace
+      case 0x09: return 0xFF09; // Tab
+      case 0x0D: return 0xFF0D; // Enter
+      case 0x1B: return 0xFF1B; // Escape
+      case 0x20: return 0x0020; // Space
+      case 0x2D: return 0xFF63; // Insert
+      case 0x2E: return 0xFFFF; // Delete
+      case 0x24: return 0xFF50; // Home
+      case 0x23: return 0xFF57; // End
+      case 0x21: return 0xFF55; // Page Up
+      case 0x22: return 0xFF56; // Page Down
+
+      case 0xBA: return 0x003B; // Semicolon (;)
+      case 0xBB: return 0x003D; // Equal (=)
+      case 0xBC: return 0x002C; // Comma (,)
+      case 0xBD: return 0x002D; // Minus (-)
+      case 0xBE: return 0x002E; // Period (.)
+      case 0xBF: return 0x002F; // Slash (/)
+      case 0xC0: return 0x0060; // Backquote (`) or ~
+      case 0xDB: return 0x005B; // Open Bracket ([)
+      case 0xDC: return 0x005C; // Backslash (\)
+      case 0xDD: return 0x005D; // Close Bracket (])
+      case 0xDE: return 0x0027; // Quote (')
+
+      case 0xA0: return 0xFFE1; // Left Shift
+      case 0xA1: return 0xFFE2; // Right Shift
+      case 0xA2: return 0xFFE3; // Left Control
+      case 0xA3: return 0xFFE4; // Right Control
+      case 0xA4: return 0xFFE9; // Left Alt
+      case 0xA5: return 0xFFEA; // Right Alt
+      case 0x5B: return 0xFFEB; // Left Meta (Win)
+      case 0x5C: return 0xFFEC; // Right Meta (Win)
+      case 0x5D: return 0xFF67; // Context Menu
+
+      case 0x90: return 0xFF7F; // Num Lock
+      case 0x91: return 0xFF14; // Scroll Lock
+      case 0x14: return 0xFFE5; // Caps Lock
+
+      case 0xAD: return 0xFF12; // Mute
+      case 0xAE: return 0xFF11; // Volume Down
+      case 0xAF: return 0xFF13; // Volume Up
+      case 0xB0: return 0xFF16; // Media Previous
+      case 0xB1: return 0xFF17; // Media Next
+      case 0xB2: return 0xFF14; // Play/Pause
+      case 0xB3: return 0xFF15; // Stop
+      default:
+        return 0x0000; // Unknown
+  }
+}
+
+void SendKeyEventToDart(UINT vkCode, bool down) {
+  if (g_flutter_window) {
+    auto messenger = g_flutter_window->GetMessenger();
+    if (messenger) {
+      int flutterKeyId = GetFlutterKeyId(vkCode);
+      if (flutterKeyId == 0) return;
+      auto channel = std::make_unique<flutter::MethodChannel<flutter::EncodableValue>>(
+          messenger,
+          "com.example.vnc_viewer/keyboard",
+          &flutter::StandardMethodCodec::GetInstance());
+
+      auto args = std::make_unique<flutter::EncodableValue>(
+          flutter::EncodableMap{
+              {"key", flutter::EncodableValue(flutterKeyId)},
+              {"vkCode", flutter::EncodableValue(vkCode)},
+              {"down", flutter::EncodableValue(down)},
+          }
+      );
+
+//      std::wcout << L"[send] Pressed=" << g_keyState
+//                     << L", args=" << args
+//                     << L"\n" << std::flush;
+      channel->InvokeMethod("onPhysicalKeyEvent", std::move(args));
+    }
+  }
+}
+
+static LRESULT CALLBACK LLKeyProc(int nCode, WPARAM w, LPARAM l) {
+  if (nCode == HC_ACTION) {
+    std::string type = "";
+    auto* kbd = reinterpret_cast<KBDLLHOOKSTRUCT*>(l);
+
+    HWND hwndFore = GetForegroundWindow();
+    if (hwndFore == nullptr) return CallNextHookEx(nullptr, nCode, w, l);
+
+    wchar_t titleName[256] = {0};
+    GetWindowText(hwndFore, titleName, 256);
+
+//    std::wcout << L"[g_keyState] Pressed=" << g_keyState
+//                     << L", kFlutterTitleName=" << kFlutterTitleName
+//                     << L", titleName=" << titleName
+//                     << L", compare=" << wcscmp(titleName, kFlutterTitleName)
+//                     << L"\n" << std::flush;
+
+    if (wcscmp(titleName, kFlutterTitleName) == 0) {
+      bool isKeyDown = (w == WM_KEYDOWN || w == WM_SYSKEYDOWN);
+      if (kbd->vkCode == VK_LSHIFT || kbd->vkCode == VK_RSHIFT) {
+        UpdateShiftState(kbd->vkCode, isKeyDown);
+      }
+//      std::wcout << L"[g_keyState] Pressed=" << g_keyState
+//                 << L", kWinPressed=" << kWinPressed
+//                 << L", vkCode=" << kbd->vkCode
+//                 << L"\n" << std::flush;
+
+      if(kbd->vkCode == 20 && !isKeyDown) {
+        return 1;
+      }
+      SendKeyEventToDart(kbd->vkCode, isKeyDown);
+      return 1;
+    } else {
+      return CallNextHookEx(nullptr, nCode, w, l);
+    }
+  }
+  return CallNextHookEx(nullptr, nCode, w, l);
+}
+
+static void InstallLLHook() {
+  if (!g_hHook) {
+    g_hHook = SetWindowsHookEx(
+      WH_KEYBOARD_LL,
+      LLKeyProc,
+      GetModuleHandle(nullptr),
+      0
+    );
+  }
+}
+
+static void RemoveLLHook() {
+  if (g_hHook) {
+    UnhookWindowsHookEx(g_hHook);
+    g_hHook = nullptr;
+  }
+}
+
+
+void FlutterWindow::CreateMessageChannel() {
+  if (!flutter_controller_ || !flutter_controller_->engine()) {
+      return;
+    }
+
+    message_channel_ =
+        std::make_unique<flutter::MethodChannel<flutter::EncodableValue>>(
+            flutter_controller_->engine()->messenger(),
+            "com.example.vnc_viewer/keyboard",
+            &flutter::StandardMethodCodec::GetInstance());
+
+    message_channel_->SetMethodCallHandler(&FlutterWindow::HandleMethodCall);
+}
+
+void FlutterWindow::HandleMethodCall(
+    const flutter::MethodCall<flutter::EncodableValue>& method_call,
+    std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result) {
+  result->NotImplemented();
+}
+
+// ----------------------------------------------------
+
+FlutterWindow::FlutterWindow(const flutter::DartProject& project)
+    : project_(project) {
+    g_flutter_window = this;
+}
+
+FlutterWindow::~FlutterWindow() {
+//  RemoveLLHook();
+}
+
+bool FlutterWindow::OnCreate() {
+  if (!Win32Window::OnCreate()) {
+    return false;
+  }
+
+  RECT frame = GetClientArea();
+
+  // The size here must match the window dimensions to avoid unnecessary surface
+  // creation / destruction in the startup path.
+  flutter_controller_ = std::make_unique<flutter::FlutterViewController>(
+      frame.right - frame.left, frame.bottom - frame.top, project_);
+  // Ensure that basic setup of the controller was successful.
+  if (!flutter_controller_->engine() || !flutter_controller_->view()) {
+    return false;
+  }
+  RegisterPlugins(flutter_controller_->engine());
+  SetChildContent(flutter_controller_->view()->GetNativeWindow());
+
+  flutter_controller_->engine()->SetNextFrameCallback([&]() {
+    this->Show();
+  });
+
+
+  CreateMessageChannel();
+
+  // Flutter can complete the first frame before the "show window" callback is
+  // registered. The following call ensures a frame is pending to ensure the
+  // window is shown. It is a no-op if the first frame hasn't completed yet.
+  flutter_controller_->ForceRedraw();
+
+  InstallLLHook();
+  return true;
+}
+
+void FlutterWindow::OnDestroy() {
+  RemoveLLHook();
+  if (flutter_controller_) {
+    flutter_controller_ = nullptr;
+  }
+
+  Win32Window::OnDestroy();
+}
+
+LRESULT
+FlutterWindow::MessageHandler(HWND hwnd, UINT const message,
+                              WPARAM const wparam,
+                              LPARAM const lparam) noexcept {
+  // Give Flutter, including plugins, an opportunity to handle window messages.
+  if (flutter_controller_) {
+    std::optional<LRESULT> result =
+        flutter_controller_->HandleTopLevelWindowProc(hwnd, message, wparam,
+                                                      lparam);
+    if (result) {
+      return *result;
+    }
+  }
+
+  switch (message) {
+    case WM_FONTCHANGE:
+      flutter_controller_->engine()->ReloadSystemFonts();
+      break;
+  }
+
+  return Win32Window::MessageHandler(hwnd, message, wparam, lparam);
+}