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bangae1
2025-08-16 12:37:47 +09:00
commit e39e21b207
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40
windows/runner/CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.14)
project(runner LANGUAGES CXX)
# Define the application target. To change its name, change BINARY_NAME in the
# top-level CMakeLists.txt, not the value here, or `flutter run` will no longer
# work.
#
# Any new source files that you add to the application should be added here.
add_executable(${BINARY_NAME} WIN32
"flutter_window.cpp"
"main.cpp"
"utils.cpp"
"win32_window.cpp"
"${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
"Runner.rc"
"runner.exe.manifest"
)
# Apply the standard set of build settings. This can be removed for applications
# that need different build settings.
apply_standard_settings(${BINARY_NAME})
# Add preprocessor definitions for the build version.
target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION=\"${FLUTTER_VERSION}\"")
target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_MAJOR=${FLUTTER_VERSION_MAJOR}")
target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_MINOR=${FLUTTER_VERSION_MINOR}")
target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_PATCH=${FLUTTER_VERSION_PATCH}")
target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_BUILD=${FLUTTER_VERSION_BUILD}")
# Disable Windows macros that collide with C++ standard library functions.
target_compile_definitions(${BINARY_NAME} PRIVATE "NOMINMAX")
# Add dependency libraries and include directories. Add any application-specific
# dependencies here.
target_link_libraries(${BINARY_NAME} PRIVATE flutter flutter_wrapper_app)
target_link_libraries(${BINARY_NAME} PRIVATE "dwmapi.lib")
target_include_directories(${BINARY_NAME} PRIVATE "${CMAKE_SOURCE_DIR}")
# Run the Flutter tool portions of the build. This must not be removed.
add_dependencies(${BINARY_NAME} flutter_assemble)

121
windows/runner/Runner.rc Normal file
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// Microsoft Visual C++ generated resource script.
//
#pragma code_page(65001)
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "winres.h"
/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
// English (United States) resources
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//
1 TEXTINCLUDE
BEGIN
"resource.h\0"
END
2 TEXTINCLUDE
BEGIN
"#include ""winres.h""\r\n"
"\0"
END
3 TEXTINCLUDE
BEGIN
"\r\n"
"\0"
END
#endif // APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Icon
//
// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDI_APP_ICON ICON "resources\\app_icon.ico"
/////////////////////////////////////////////////////////////////////////////
//
// Version
//
#if defined(FLUTTER_VERSION_MAJOR) && defined(FLUTTER_VERSION_MINOR) && defined(FLUTTER_VERSION_PATCH) && defined(FLUTTER_VERSION_BUILD)
#define VERSION_AS_NUMBER FLUTTER_VERSION_MAJOR,FLUTTER_VERSION_MINOR,FLUTTER_VERSION_PATCH,FLUTTER_VERSION_BUILD
#else
#define VERSION_AS_NUMBER 1,0,0,0
#endif
#if defined(FLUTTER_VERSION)
#define VERSION_AS_STRING FLUTTER_VERSION
#else
#define VERSION_AS_STRING "1.0.0"
#endif
VS_VERSION_INFO VERSIONINFO
FILEVERSION VERSION_AS_NUMBER
PRODUCTVERSION VERSION_AS_NUMBER
FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
#ifdef _DEBUG
FILEFLAGS VS_FF_DEBUG
#else
FILEFLAGS 0x0L
#endif
FILEOS VOS__WINDOWS32
FILETYPE VFT_APP
FILESUBTYPE 0x0L
BEGIN
BLOCK "StringFileInfo"
BEGIN
BLOCK "040904e4"
BEGIN
VALUE "CompanyName", "com.example" "\0"
VALUE "FileDescription", "vnc_viewer" "\0"
VALUE "FileVersion", VERSION_AS_STRING "\0"
VALUE "InternalName", "vnc_viewer" "\0"
VALUE "LegalCopyright", "Copyright (C) 2025 com.example. All rights reserved." "\0"
VALUE "OriginalFilename", "vnc_viewer.exe" "\0"
VALUE "ProductName", "vnc_viewer" "\0"
VALUE "ProductVersion", VERSION_AS_STRING "\0"
END
END
BLOCK "VarFileInfo"
BEGIN
VALUE "Translation", 0x409, 1252
END
END
#endif // English (United States) resources
/////////////////////////////////////////////////////////////////////////////
#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//
/////////////////////////////////////////////////////////////////////////////
#endif // not APSTUDIO_INVOKED

313
windows/runner/flutter_window.cpp Normal file
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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);
}

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windows/runner/flutter_window.h Normal file
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#ifndef RUNNER_FLUTTER_WINDOW_H_
#define RUNNER_FLUTTER_WINDOW_H_
#include <flutter/dart_project.h>
#include <flutter/flutter_view_controller.h>
#include <memory>
#include "flutter/method_channel.h"
#include "flutter/plugin_registrar_windows.h"
#include "flutter/standard_method_codec.h"
#include "win32_window.h"
// A window that does nothing but host a Flutter view.
class FlutterWindow : public Win32Window {
public:
// Creates a new FlutterWindow hosting a Flutter view running |project|.
explicit FlutterWindow(const flutter::DartProject& project);
virtual ~FlutterWindow();
auto GetMessenger() -> flutter::BinaryMessenger* {
return flutter_controller_ ? flutter_controller_->engine()->messenger() : nullptr;
}
protected:
// Win32Window:
bool OnCreate() override;
void OnDestroy() override;
LRESULT MessageHandler(HWND window, UINT const message, WPARAM const wparam,
LPARAM const lparam) noexcept override;
private:
// The project to run.
flutter::DartProject project_;
// The Flutter instance hosted by this window.
std::unique_ptr<flutter::FlutterViewController> flutter_controller_;
std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> message_channel_;
std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> registrar_;
void CreateMessageChannel();
static void HandleMethodCall(
const flutter::MethodCall<flutter::EncodableValue>& method_call,
std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result);
};
#endif // RUNNER_FLUTTER_WINDOW_H_

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windows/runner/main.cpp Normal file
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#include <flutter/dart_project.h>
#include <flutter/flutter_view_controller.h>
#include <windows.h>
#include "flutter_window.h"
#include "utils.h"
int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
_In_ wchar_t *command_line, _In_ int show_command) {
// Attach to console when present (e.g., 'flutter run') or create a
// new console when running with a debugger.
if (!::AttachConsole(ATTACH_PARENT_PROCESS) && ::IsDebuggerPresent()) {
CreateAndAttachConsole();
}
// Initialize COM, so that it is available for use in the library and/or
// plugins.
::CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
flutter::DartProject project(L"data");
std::vector<std::string> command_line_arguments =
GetCommandLineArguments();
project.set_dart_entrypoint_arguments(std::move(command_line_arguments));
FlutterWindow window(project);
Win32Window::Point origin(10, 10);
Win32Window::Size size(1280, 720);
if (!window.Create(L"vnc_viewer", origin, size)) {
return EXIT_FAILURE;
}
window.SetQuitOnClose(true);
::MSG msg;
while (::GetMessage(&msg, nullptr, 0, 0)) {
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
::CoUninitialize();
return EXIT_SUCCESS;
}

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windows/runner/resource.h Normal file
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//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ generated include file.
// Used by Runner.rc
//
#define IDI_APP_ICON 101
// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 102
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif

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14
windows/runner/runner.exe.manifest Normal file
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings>
<dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
</windowsSettings>
</application>
<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
<application>
<!-- Windows 10 and Windows 11 -->
<supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
</application>
</compatibility>
</assembly>

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windows/runner/utils.cpp Normal file
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#include "utils.h"
#include <flutter_windows.h>
#include <io.h>
#include <stdio.h>
#include <windows.h>
#include <iostream>
void CreateAndAttachConsole() {
if (::AllocConsole()) {
FILE *unused;
if (freopen_s(&unused, "CONOUT$", "w", stdout)) {
_dup2(_fileno(stdout), 1);
}
if (freopen_s(&unused, "CONOUT$", "w", stderr)) {
_dup2(_fileno(stdout), 2);
}
std::ios::sync_with_stdio();
FlutterDesktopResyncOutputStreams();
}
}
std::vector<std::string> GetCommandLineArguments() {
// Convert the UTF-16 command line arguments to UTF-8 for the Engine to use.
int argc;
wchar_t** argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
if (argv == nullptr) {
return std::vector<std::string>();
}
std::vector<std::string> command_line_arguments;
// Skip the first argument as it's the binary name.
for (int i = 1; i < argc; i++) {
command_line_arguments.push_back(Utf8FromUtf16(argv[i]));
}
::LocalFree(argv);
return command_line_arguments;
}
std::string Utf8FromUtf16(const wchar_t* utf16_string) {
if (utf16_string == nullptr) {
return std::string();
}
unsigned int target_length = ::WideCharToMultiByte(
CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string,
-1, nullptr, 0, nullptr, nullptr)
-1; // remove the trailing null character
int input_length = (int)wcslen(utf16_string);
std::string utf8_string;
if (target_length == 0 || target_length > utf8_string.max_size()) {
return utf8_string;
}
utf8_string.resize(target_length);
int converted_length = ::WideCharToMultiByte(
CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string,
input_length, utf8_string.data(), target_length, nullptr, nullptr);
if (converted_length == 0) {
return std::string();
}
return utf8_string;
}

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windows/runner/utils.h Normal file
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#ifndef RUNNER_UTILS_H_
#define RUNNER_UTILS_H_
#include <string>
#include <vector>
// Creates a console for the process, and redirects stdout and stderr to
// it for both the runner and the Flutter library.
void CreateAndAttachConsole();
// Takes a null-terminated wchar_t* encoded in UTF-16 and returns a std::string
// encoded in UTF-8. Returns an empty std::string on failure.
std::string Utf8FromUtf16(const wchar_t* utf16_string);
// Gets the command line arguments passed in as a std::vector<std::string>,
// encoded in UTF-8. Returns an empty std::vector<std::string> on failure.
std::vector<std::string> GetCommandLineArguments();
#endif // RUNNER_UTILS_H_

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windows/runner/win32_window.cpp Normal file
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#include "win32_window.h"
#include <dwmapi.h>
#include <flutter_windows.h>
#include "resource.h"
namespace {
/// Window attribute that enables dark mode window decorations.
///
/// Redefined in case the developer's machine has a Windows SDK older than
/// version 10.0.22000.0.
/// See: https://docs.microsoft.com/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
#ifndef DWMWA_USE_IMMERSIVE_DARK_MODE
#define DWMWA_USE_IMMERSIVE_DARK_MODE 20
#endif
constexpr const wchar_t kWindowClassName[] = L"FLUTTER_RUNNER_WIN32_WINDOW";
/// Registry key for app theme preference.
///
/// A value of 0 indicates apps should use dark mode. A non-zero or missing
/// value indicates apps should use light mode.
constexpr const wchar_t kGetPreferredBrightnessRegKey[] =
L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize";
constexpr const wchar_t kGetPreferredBrightnessRegValue[] = L"AppsUseLightTheme";
// The number of Win32Window objects that currently exist.
static int g_active_window_count = 0;
using EnableNonClientDpiScaling = BOOL __stdcall(HWND hwnd);
// Scale helper to convert logical scaler values to physical using passed in
// scale factor
int Scale(int source, double scale_factor) {
return static_cast<int>(source * scale_factor);
}
// Dynamically loads the |EnableNonClientDpiScaling| from the User32 module.
// This API is only needed for PerMonitor V1 awareness mode.
void EnableFullDpiSupportIfAvailable(HWND hwnd) {
HMODULE user32_module = LoadLibraryA("User32.dll");
if (!user32_module) {
return;
}
auto enable_non_client_dpi_scaling =
reinterpret_cast<EnableNonClientDpiScaling*>(
GetProcAddress(user32_module, "EnableNonClientDpiScaling"));
if (enable_non_client_dpi_scaling != nullptr) {
enable_non_client_dpi_scaling(hwnd);
}
FreeLibrary(user32_module);
}
} // namespace
// Manages the Win32Window's window class registration.
class WindowClassRegistrar {
public:
~WindowClassRegistrar() = default;
// Returns the singleton registrar instance.
static WindowClassRegistrar* GetInstance() {
if (!instance_) {
instance_ = new WindowClassRegistrar();
}
return instance_;
}
// Returns the name of the window class, registering the class if it hasn't
// previously been registered.
const wchar_t* GetWindowClass();
// Unregisters the window class. Should only be called if there are no
// instances of the window.
void UnregisterWindowClass();
private:
WindowClassRegistrar() = default;
static WindowClassRegistrar* instance_;
bool class_registered_ = false;
};
WindowClassRegistrar* WindowClassRegistrar::instance_ = nullptr;
const wchar_t* WindowClassRegistrar::GetWindowClass() {
if (!class_registered_) {
WNDCLASS window_class{};
window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
window_class.lpszClassName = kWindowClassName;
window_class.style = CS_HREDRAW | CS_VREDRAW;
window_class.cbClsExtra = 0;
window_class.cbWndExtra = 0;
window_class.hInstance = GetModuleHandle(nullptr);
window_class.hIcon =
LoadIcon(window_class.hInstance, MAKEINTRESOURCE(IDI_APP_ICON));
window_class.hbrBackground = 0;
window_class.lpszMenuName = nullptr;
window_class.lpfnWndProc = Win32Window::WndProc;
RegisterClass(&window_class);
class_registered_ = true;
}
return kWindowClassName;
}
void WindowClassRegistrar::UnregisterWindowClass() {
UnregisterClass(kWindowClassName, nullptr);
class_registered_ = false;
}
Win32Window::Win32Window() {
++g_active_window_count;
}
Win32Window::~Win32Window() {
--g_active_window_count;
Destroy();
}
bool Win32Window::Create(const std::wstring& title,
const Point& origin,
const Size& size) {
Destroy();
const wchar_t* window_class =
WindowClassRegistrar::GetInstance()->GetWindowClass();
const POINT target_point = {static_cast<LONG>(origin.x),
static_cast<LONG>(origin.y)};
HMONITOR monitor = MonitorFromPoint(target_point, MONITOR_DEFAULTTONEAREST);
UINT dpi = FlutterDesktopGetDpiForMonitor(monitor);
double scale_factor = dpi / 96.0;
HWND window = CreateWindow(
window_class, title.c_str(), WS_OVERLAPPEDWINDOW,
Scale(origin.x, scale_factor), Scale(origin.y, scale_factor),
Scale(size.width, scale_factor), Scale(size.height, scale_factor),
nullptr, nullptr, GetModuleHandle(nullptr), this);
if (!window) {
return false;
}
UpdateTheme(window);
return OnCreate();
}
bool Win32Window::Show() {
return ShowWindow(window_handle_, SW_SHOWNORMAL);
}
// static
LRESULT CALLBACK Win32Window::WndProc(HWND const window,
UINT const message,
WPARAM const wparam,
LPARAM const lparam) noexcept {
if (message == WM_NCCREATE) {
auto window_struct = reinterpret_cast<CREATESTRUCT*>(lparam);
SetWindowLongPtr(window, GWLP_USERDATA,
reinterpret_cast<LONG_PTR>(window_struct->lpCreateParams));
auto that = static_cast<Win32Window*>(window_struct->lpCreateParams);
EnableFullDpiSupportIfAvailable(window);
that->window_handle_ = window;
} else if (Win32Window* that = GetThisFromHandle(window)) {
return that->MessageHandler(window, message, wparam, lparam);
}
return DefWindowProc(window, message, wparam, lparam);
}
LRESULT
Win32Window::MessageHandler(HWND hwnd,
UINT const message,
WPARAM const wparam,
LPARAM const lparam) noexcept {
switch (message) {
case WM_DESTROY:
window_handle_ = nullptr;
Destroy();
if (quit_on_close_) {
PostQuitMessage(0);
}
return 0;
case WM_DPICHANGED: {
auto newRectSize = reinterpret_cast<RECT*>(lparam);
LONG newWidth = newRectSize->right - newRectSize->left;
LONG newHeight = newRectSize->bottom - newRectSize->top;
SetWindowPos(hwnd, nullptr, newRectSize->left, newRectSize->top, newWidth,
newHeight, SWP_NOZORDER | SWP_NOACTIVATE);
return 0;
}
case WM_SIZE: {
RECT rect = GetClientArea();
if (child_content_ != nullptr) {
// Size and position the child window.
MoveWindow(child_content_, rect.left, rect.top, rect.right - rect.left,
rect.bottom - rect.top, TRUE);
}
return 0;
}
case WM_ACTIVATE:
if (child_content_ != nullptr) {
SetFocus(child_content_);
}
return 0;
case WM_DWMCOLORIZATIONCOLORCHANGED:
UpdateTheme(hwnd);
return 0;
}
return DefWindowProc(window_handle_, message, wparam, lparam);
}
void Win32Window::Destroy() {
OnDestroy();
if (window_handle_) {
DestroyWindow(window_handle_);
window_handle_ = nullptr;
}
if (g_active_window_count == 0) {
WindowClassRegistrar::GetInstance()->UnregisterWindowClass();
}
}
Win32Window* Win32Window::GetThisFromHandle(HWND const window) noexcept {
return reinterpret_cast<Win32Window*>(
GetWindowLongPtr(window, GWLP_USERDATA));
}
void Win32Window::SetChildContent(HWND content) {
child_content_ = content;
SetParent(content, window_handle_);
RECT frame = GetClientArea();
MoveWindow(content, frame.left, frame.top, frame.right - frame.left,
frame.bottom - frame.top, true);
SetFocus(child_content_);
}
RECT Win32Window::GetClientArea() {
RECT frame;
GetClientRect(window_handle_, &frame);
return frame;
}
HWND Win32Window::GetHandle() {
return window_handle_;
}
void Win32Window::SetQuitOnClose(bool quit_on_close) {
quit_on_close_ = quit_on_close;
}
bool Win32Window::OnCreate() {
// No-op; provided for subclasses.
return true;
}
void Win32Window::OnDestroy() {
// No-op; provided for subclasses.
}
void Win32Window::UpdateTheme(HWND const window) {
DWORD light_mode;
DWORD light_mode_size = sizeof(light_mode);
LSTATUS result = RegGetValue(HKEY_CURRENT_USER, kGetPreferredBrightnessRegKey,
kGetPreferredBrightnessRegValue,
RRF_RT_REG_DWORD, nullptr, &light_mode,
&light_mode_size);
if (result == ERROR_SUCCESS) {
BOOL enable_dark_mode = light_mode == 0;
DwmSetWindowAttribute(window, DWMWA_USE_IMMERSIVE_DARK_MODE,
&enable_dark_mode, sizeof(enable_dark_mode));
}
}

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windows/runner/win32_window.h Normal file
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#ifndef RUNNER_WIN32_WINDOW_H_
#define RUNNER_WIN32_WINDOW_H_
#include <windows.h>
#include <functional>
#include <memory>
#include <string>
// A class abstraction for a high DPI-aware Win32 Window. Intended to be
// inherited from by classes that wish to specialize with custom
// rendering and input handling
class Win32Window {
public:
struct Point {
unsigned int x;
unsigned int y;
Point(unsigned int x, unsigned int y) : x(x), y(y) {}
};
struct Size {
unsigned int width;
unsigned int height;
Size(unsigned int width, unsigned int height)
: width(width), height(height) {}
};
Win32Window();
virtual ~Win32Window();
// Creates a win32 window with |title| that is positioned and sized using
// |origin| and |size|. New windows are created on the default monitor. Window
// sizes are specified to the OS in physical pixels, hence to ensure a
// consistent size this function will scale the inputted width and height as
// as appropriate for the default monitor. The window is invisible until
// |Show| is called. Returns true if the window was created successfully.
bool Create(const std::wstring& title, const Point& origin, const Size& size);
// Show the current window. Returns true if the window was successfully shown.
bool Show();
// Release OS resources associated with window.
void Destroy();
// Inserts |content| into the window tree.
void SetChildContent(HWND content);
// Returns the backing Window handle to enable clients to set icon and other
// window properties. Returns nullptr if the window has been destroyed.
HWND GetHandle();
// If true, closing this window will quit the application.
void SetQuitOnClose(bool quit_on_close);
// Return a RECT representing the bounds of the current client area.
RECT GetClientArea();
protected:
// Processes and route salient window messages for mouse handling,
// size change and DPI. Delegates handling of these to member overloads that
// inheriting classes can handle.
virtual LRESULT MessageHandler(HWND window,
UINT const message,
WPARAM const wparam,
LPARAM const lparam) noexcept;
// Called when CreateAndShow is called, allowing subclass window-related
// setup. Subclasses should return false if setup fails.
virtual bool OnCreate();
// Called when Destroy is called.
virtual void OnDestroy();
private:
friend class WindowClassRegistrar;
// OS callback called by message pump. Handles the WM_NCCREATE message which
// is passed when the non-client area is being created and enables automatic
// non-client DPI scaling so that the non-client area automatically
// responds to changes in DPI. All other messages are handled by
// MessageHandler.
static LRESULT CALLBACK WndProc(HWND const window,
UINT const message,
WPARAM const wparam,
LPARAM const lparam) noexcept;
// Retrieves a class instance pointer for |window|
static Win32Window* GetThisFromHandle(HWND const window) noexcept;
// Update the window frame's theme to match the system theme.
static void UpdateTheme(HWND const window);
bool quit_on_close_ = false;
// window handle for top level window.
HWND window_handle_ = nullptr;
// window handle for hosted content.
HWND child_content_ = nullptr;
};
#endif // RUNNER_WIN32_WINDOW_H_