private static void WndProc(Window window, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == NativeMethods.WM_TOUCH)
{
var inputCount = wParam.ToInt32() & 0xffff;
var inputs = new NativeMethods.TOUCHINPUT[inputCount];
if (NativeMethods.GetTouchInputInfo(lParam, inputCount, inputs, NativeMethods.TouchInputSize))
{
for (int i = 0; i < inputCount; i++)
{
var input = inputs[i];
// 下面没有处理 DPI 问题
// 相对的是没有处理 DPI 的屏幕坐标
// 因为是 物理屏幕坐标的像素的百分之一表示，需要除 100 计算像素
var position = new Point(input.X / 100.0, input.Y / 100.0);
var size = new Size(input.CxContact / 100.0, input.CyContact / 100.0);
if (!_devices.TryGetValue(input.DwID, out var device))
{
device = new MessageTouchDevice(input.DwID, window);
_devices.Add(input.DwID, device);
}
if (!device.IsActive && input.DwFlags.HasFlag(NativeMethods.TOUCHEVENTF.TOUCHEVENTF_DOWN))
{
device.Position = position;
device.Size = size;
device.Down();
}
else if (device.IsActive && input.DwFlags.HasFlag(NativeMethods.TOUCHEVENTF.TOUCHEVENTF_UP))
{
device.Position = position;
device.Size = size;
device.Up();
}
else if (device.IsActive && input.DwFlags.HasFlag(NativeMethods.TOUCHEVENTF.TOUCHEVENTF_MOVE))
{
device.Position = position;
device.Size = size;
device.Move();
}
}
}
NativeMethods.CloseTouchInputHandle(lParam);
handled = true;
}
}
private void MainWindow_SourceInitialized(object sender, EventArgs e)
{
MessageTouchDevice.UseMessageTouch(this);
}