m: Remove once_cell dependency

Removes the once_cell dependency, instead using std::sync::OnceLock and a
minimal polyfill for std::sync::LazyLock, which may be stabilized soon
(see rust-lang/rust#121377).

This should not require a bump in MSRV, as OnceLock was stabilized in 1.70,
which this crate is using.

src/platform_impl/windows/dark_mode.rs

@@ -2,7 +2,7 @@
 /// which is inspired by the solution in https://github.com/ysc3839/win32-darkmode
 use std::{ffi::c_void, ptr};
 
-use once_cell::sync::Lazy;
+use crate::utils::Lazy;
 use windows_sys::{
     core::PCSTR,
     Win32::{

src/platform_impl/windows/event_loop.rs

@@ -17,7 +17,7 @@ use std::{
     time::{Duration, Instant},
 };
 
-use once_cell::sync::Lazy;
+use crate::utils::Lazy;
 
 use windows_sys::Win32::{
     Devices::HumanInterfaceDevice::MOUSE_MOVE_RELATIVE,
@@ -848,16 +848,16 @@ static USER_EVENT_MSG_ID: LazyMessageId = LazyMessageId::new("Winit::WakeupMsg\0
 static EXEC_MSG_ID: LazyMessageId = LazyMessageId::new("Winit::ExecMsg\0");
 // Message sent by a `Window` when it wants to be destroyed by the main thread.
 // WPARAM and LPARAM are unused.
-pub static DESTROY_MSG_ID: LazyMessageId = LazyMessageId::new("Winit::DestroyMsg\0");
+pub(crate) static DESTROY_MSG_ID: LazyMessageId = LazyMessageId::new("Winit::DestroyMsg\0");
 // WPARAM is a bool specifying the `WindowFlags::MARKER_RETAIN_STATE_ON_SIZE` flag. See the
 // documentation in the `window_state` module for more information.
-pub static SET_RETAIN_STATE_ON_SIZE_MSG_ID: LazyMessageId =
+pub(crate) static SET_RETAIN_STATE_ON_SIZE_MSG_ID: LazyMessageId =
     LazyMessageId::new("Winit::SetRetainMaximized\0");
 static THREAD_EVENT_TARGET_WINDOW_CLASS: Lazy<Vec<u16>> =
     Lazy::new(|| util::encode_wide("Winit Thread Event Target"));
 /// When the taskbar is created, it registers a message with the "TaskbarCreated" string and then broadcasts this message to all top-level windows
 /// <https://docs.microsoft.com/en-us/windows/win32/shell/taskbar#taskbar-creation-notification>
-pub static TASKBAR_CREATED: LazyMessageId = LazyMessageId::new("TaskbarCreated\0");
+pub(crate) static TASKBAR_CREATED: LazyMessageId = LazyMessageId::new("TaskbarCreated\0");
 
 fn create_event_target_window() -> HWND {
     use windows_sys::Win32::UI::WindowsAndMessaging::CS_HREDRAW;

src/platform_impl/windows/keyboard_layout.rs

@@ -5,7 +5,7 @@ use std::{
     sync::Mutex,
 };
 
-use once_cell::sync::Lazy;
+use crate::utils::Lazy;
 use smol_str::SmolStr;
 use windows_sys::Win32::{
     System::SystemServices::{LANG_JAPANESE, LANG_KOREAN},

src/platform_impl/windows/util.rs

@@ -9,7 +9,7 @@ use std::{
     sync::atomic::{AtomicBool, Ordering},
 };
 
-use once_cell::sync::Lazy;
+use crate::utils::Lazy;
 use windows_sys::{
     core::{HRESULT, PCWSTR},
     Win32::{
@@ -262,27 +262,27 @@ pub type GetPointerTouchInfo =
 pub type GetPointerPenInfo =
     unsafe extern "system" fn(pointId: u32, penInfo: *mut POINTER_PEN_INFO) -> BOOL;
 
-pub static GET_DPI_FOR_WINDOW: Lazy<Option<GetDpiForWindow>> =
+pub(crate) static GET_DPI_FOR_WINDOW: Lazy<Option<GetDpiForWindow>> =
     Lazy::new(|| get_function!("user32.dll", GetDpiForWindow));
-pub static ADJUST_WINDOW_RECT_EX_FOR_DPI: Lazy<Option<AdjustWindowRectExForDpi>> =
+pub(crate) static ADJUST_WINDOW_RECT_EX_FOR_DPI: Lazy<Option<AdjustWindowRectExForDpi>> =
     Lazy::new(|| get_function!("user32.dll", AdjustWindowRectExForDpi));
-pub static GET_DPI_FOR_MONITOR: Lazy<Option<GetDpiForMonitor>> =
+pub(crate) static GET_DPI_FOR_MONITOR: Lazy<Option<GetDpiForMonitor>> =
     Lazy::new(|| get_function!("shcore.dll", GetDpiForMonitor));
-pub static ENABLE_NON_CLIENT_DPI_SCALING: Lazy<Option<EnableNonClientDpiScaling>> =
+pub(crate) static ENABLE_NON_CLIENT_DPI_SCALING: Lazy<Option<EnableNonClientDpiScaling>> =
     Lazy::new(|| get_function!("user32.dll", EnableNonClientDpiScaling));
-pub static SET_PROCESS_DPI_AWARENESS_CONTEXT: Lazy<Option<SetProcessDpiAwarenessContext>> =
+pub(crate) static SET_PROCESS_DPI_AWARENESS_CONTEXT: Lazy<Option<SetProcessDpiAwarenessContext>> =
     Lazy::new(|| get_function!("user32.dll", SetProcessDpiAwarenessContext));
-pub static SET_PROCESS_DPI_AWARENESS: Lazy<Option<SetProcessDpiAwareness>> =
+pub(crate) static SET_PROCESS_DPI_AWARENESS: Lazy<Option<SetProcessDpiAwareness>> =
     Lazy::new(|| get_function!("shcore.dll", SetProcessDpiAwareness));
-pub static SET_PROCESS_DPI_AWARE: Lazy<Option<SetProcessDPIAware>> =
+pub(crate) static SET_PROCESS_DPI_AWARE: Lazy<Option<SetProcessDPIAware>> =
     Lazy::new(|| get_function!("user32.dll", SetProcessDPIAware));
-pub static GET_POINTER_FRAME_INFO_HISTORY: Lazy<Option<GetPointerFrameInfoHistory>> =
+pub(crate) static GET_POINTER_FRAME_INFO_HISTORY: Lazy<Option<GetPointerFrameInfoHistory>> =
     Lazy::new(|| get_function!("user32.dll", GetPointerFrameInfoHistory));
-pub static SKIP_POINTER_FRAME_MESSAGES: Lazy<Option<SkipPointerFrameMessages>> =
+pub(crate) static SKIP_POINTER_FRAME_MESSAGES: Lazy<Option<SkipPointerFrameMessages>> =
     Lazy::new(|| get_function!("user32.dll", SkipPointerFrameMessages));
-pub static GET_POINTER_DEVICE_RECTS: Lazy<Option<GetPointerDeviceRects>> =
+pub(crate) static GET_POINTER_DEVICE_RECTS: Lazy<Option<GetPointerDeviceRects>> =
     Lazy::new(|| get_function!("user32.dll", GetPointerDeviceRects));
-pub static GET_POINTER_TOUCH_INFO: Lazy<Option<GetPointerTouchInfo>> =
+pub(crate) static GET_POINTER_TOUCH_INFO: Lazy<Option<GetPointerTouchInfo>> =
     Lazy::new(|| get_function!("user32.dll", GetPointerTouchInfo));
-pub static GET_POINTER_PEN_INFO: Lazy<Option<GetPointerPenInfo>> =
+pub(crate) static GET_POINTER_PEN_INFO: Lazy<Option<GetPointerPenInfo>> =
     Lazy::new(|| get_function!("user32.dll", GetPointerPenInfo));