forked from alexvasl/drifter_app
289 lines
8.3 KiB
C++
289 lines
8.3 KiB
C++
|
#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 registar 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));
|
||
|
}
|
||
|
}
|