I want to enable SnapLayout for WPF. Because I use Customized Window, according to the

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Mark the WM_NCLBUTTONDOWN message as handled. This prevents the classic button from showing.

case InteropValues.WM_NCLBUTTONDOWN:
     handled = true;
     break;

Handle various WM_NC* mouse messages and using SendMessage to send related messages to the Window to mimic "client area" mouse messages with translated POINT values so that WPF can receive them.