/// <summary>
/// Updates key names according to the current keyboard layout.
/// </summary>
private void PopulateKeyNames()
{
var state = new byte[256];
// Initialize the key names array.
_keyNames = new string[_scanCodes.Length];
for (var key = (int)Key.Space; key < (int)Key.Last; key++)
{
uint vk;
int scanCode = _scanCodes[key];
if (scanCode == -1)
{
continue;
}
if (key >= (int)Key.Kp0 && key <= (int)Key.KpAdd)
{
uint[] vks =
{
(uint)VirtualKey.NUMPAD0, (uint)VirtualKey.NUMPAD1, (uint)VirtualKey.NUMPAD2, (uint)VirtualKey.NUMPAD3,
(uint)VirtualKey.NUMPAD4, (uint)VirtualKey.NUMPAD5, (uint)VirtualKey.NUMPAD6, (uint)VirtualKey.NUMPAD7,
(uint)VirtualKey.NUMPAD8, (uint)VirtualKey.NUMPAD9, (uint)VirtualKey.DECIMAL, (uint)VirtualKey.DIVIDE,
(uint)VirtualKey.MULTIPLY, (uint)VirtualKey.SUBTRACT, (uint)VirtualKey.ADD
};
vk = vks[key - (int)Key.Kp0];
}
else
{
vk = User32.MapVirtualKey((uint)scanCode, VirtualKeyMapType.MAPVK_VSC_TO_VK);
}
var chars = new StringBuilder(16);
int length = User32.ToUnicode(vk, (uint)scanCode, state, chars, chars.Capacity, 0);
if (length == -1)
{
length = User32.ToUnicode(vk, (uint)scanCode, state, chars, chars.Capacity, 0);
}
if (length < 1)
{
continue;
}
var keyName = new char[5];
Kernel32.WideCharToMultiByte(CodePage.CpUtf8, 0, chars, 1, keyName, keyName.Length, IntPtr.Zero, out bool _);
_keyNames[key] = NativeHelpers.StringFromNullTerminated(keyName);
}
}
