protected virtual bool PreprocessScrollWheel(NSEvent e)
{
var view = (ContentView.Superview ?? ContentView).HitTest(e.LocationInWindow);
if (view != null && !view.IsSwfControl() && Control.FromChildHandle(view.Handle) is Control control)
{
// This is to allow SWF wrappers of native views to handle messages before the native view swallows them (WebView, for example).
var p = driver.NativeToMonoScreen(this.ConvertPointToScreenSafe(e.LocationInWindow));
if (Math.Abs(e.ScrollingDeltaY - nfloat.Epsilon) > 0)
{
var delta = e.ScaledAndQuantizedDeltaY();
var wParam = (IntPtr)(((int)e.ModifiersToWParam() & 0xFFFF) | (delta << 16));
var lParam = (IntPtr)((p.X & 0xFFFF) | (p.Y << 16));
var msg = new MSG {
hwnd = control.Handle, message = Msg.WM_MOUSEWHEEL, wParam = wParam, lParam = lParam
};
if (Application.SendMessage(ref msg, out var drop, out var _).ToInt32() == 0 || drop)
{
return(true);
}
}
if (Math.Abs(e.ScrollingDeltaX - nfloat.Epsilon) > 0)
{
int delta = e.ScaledAndQuantizedDeltaX();
var wParam = (IntPtr)(((int)e.ModifiersToWParam() & 0xFFFF) | (delta << 16));
var lParam = (IntPtr)((p.X & 0xFFFF) | (p.Y << 16));
var msg = new MSG {
hwnd = control.Handle, message = Msg.WM_MOUSEHWHEEL, wParam = wParam, lParam = lParam
};
if (Application.SendMessage(ref msg, out var drop, out var _).ToInt32() == 0 || drop)
{
return(true);
}
}
}
return(false);
}
public override void ScrollWheel(NSEvent e)
{
var msg = TranslateMouseCore(e, out bool _);
if (e.ScrollingDeltaY != 0)
{
int delta = e.ScaledAndQuantizedDeltaY();
msg.message = Msg.WM_MOUSEWHEEL;
msg.wParam = (IntPtr)(((int)e.ModifiersToWParam() & 0xFFFF) | (delta << 16));
msg.lParam = (IntPtr)((msg.pt.x & 0xFFFF) | (msg.pt.y << 16));
Application.SendMessage(ref msg);
}
if (e.ScrollingDeltaX != 0)
{
int delta = e.ScaledAndQuantizedDeltaX();
msg.message = Msg.WM_MOUSEHWHEEL;
msg.wParam = (IntPtr)(((int)e.ModifiersToWParam() & 0xFFFF) | (delta << 16));
msg.lParam = (IntPtr)((msg.pt.x & 0xFFFF) | (msg.pt.y << 16));
Application.SendMessage(ref msg);
}
}
