Recordly/electron/cursorHider.ts

import { spawnSync } from "node:child_process";

const PY_HIDE_WIN = `
import ctypes, sys

class POINT(ctypes.Structure):
    _fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]

class CURSORINFO(ctypes.Structure):
    _fields_ = [
        ("cbSize", ctypes.c_uint),
        ("flags", ctypes.c_uint),
        ("hCursor", ctypes.c_void_p),
        ("ptScreenPos", POINT),
    ]

user32 = ctypes.windll.user32
CURSOR_SHOWING = 0x00000001

for _ in range(32):
    info = CURSORINFO()
    info.cbSize = ctypes.sizeof(CURSORINFO)
    if user32.GetCursorInfo(ctypes.byref(info)) and not (info.flags & CURSOR_SHOWING):
        sys.exit(0)
    user32.ShowCursor(False)

sys.exit(0)
`.trim();

const PY_SHOW_WIN = `
import ctypes, sys

class POINT(ctypes.Structure):
    _fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]

class CURSORINFO(ctypes.Structure):
    _fields_ = [
        ("cbSize", ctypes.c_uint),
        ("flags", ctypes.c_uint),
        ("hCursor", ctypes.c_void_p),
        ("ptScreenPos", POINT),
    ]

user32 = ctypes.windll.user32
CURSOR_SHOWING = 0x00000001

for _ in range(32):
    info = CURSORINFO()
    info.cbSize = ctypes.sizeof(CURSORINFO)
    if user32.GetCursorInfo(ctypes.byref(info)) and (info.flags & CURSOR_SHOWING):
        sys.exit(0)
    user32.ShowCursor(True)

sys.exit(0)
`.trim();

function getPowerShellCommand(show: boolean) {
	const desiredFlag = show ? 1 : 0;
	const showLiteral = show ? "$true" : "$false";

	return [
		'$signature = @"',
		"using System;",
		"using System.Runtime.InteropServices;",
		"public struct POINT { public int X; public int Y; }",
		"public struct CURSORINFO { public int cbSize; public int flags; public IntPtr hCursor; public POINT ptScreenPos; }",
		"public static class CursorNative {",
		'  [DllImport("user32.dll")] public static extern int ShowCursor(bool show);',
		'  [DllImport("user32.dll")] public static extern bool GetCursorInfo(ref CURSORINFO info);',
		"}",
		'"@;',
		"Add-Type -TypeDefinition $signature -Language CSharp -ErrorAction SilentlyContinue | Out-Null;",
		"$info = New-Object CURSORINFO;",
		"$info.cbSize = [Runtime.InteropServices.Marshal]::SizeOf([type]CURSORINFO);",
		"for ($i = 0; $i -lt 32; $i++) {",
		"  if ([CursorNative]::GetCursorInfo([ref]$info) -and (($info.flags -band 1) -eq " +
			desiredFlag +
			")) { exit 0 }",
		"  [CursorNative]::ShowCursor(" + showLiteral + ") | Out-Null;",
		"}",
		"exit 0",
	].join(" ");
}

function runPythonSnippet(code: string) {
	for (const executable of ["python", "python3", "py"]) {
		const result = spawnSync(executable, ["-c", code], { timeout: 5000 });
		if (!result.error && result.status === 0) {
			return true;
		}
	}

	return false;
}

function runPowerShellSnippet(command: string) {
	const result = spawnSync(
		"powershell.exe",
		["-NoProfile", "-NonInteractive", "-WindowStyle", "Hidden", "-Command", command],
		{ timeout: 8000 },
	);

	return !result.error && result.status === 0;
}

let cursorHidden = false;

export function hideCursor() {
	if (process.platform !== "win32" || cursorHidden) {
		return false;
	}

	try {
		const didHide =
			runPythonSnippet(PY_HIDE_WIN) || runPowerShellSnippet(getPowerShellCommand(false));

		if (didHide) {
			cursorHidden = true;
		}

		return didHide;
	} catch (error) {
		console.error("[cursorHider] Failed to hide Windows cursor:", error);
		return false;
	}
}

export function showCursor() {
	if (process.platform !== "win32" || !cursorHidden) {
		return false;
	}

	try {
		const didShow =
			runPythonSnippet(PY_SHOW_WIN) || runPowerShellSnippet(getPowerShellCommand(true));
		if (didShow) {
			cursorHidden = false;
		}
		return didShow;
	} catch (error) {
		console.error("[cursorHider] Failed to show Windows cursor:", error);
		return false;
	}
}