private Subclass(IntPtr hwnd)
{
FHwnd = hwnd;
FSubclassProcDelegate = SubclassProc;
if (!ComCtl32.SetWindowSubclass(FHwnd, FSubclassProcDelegate, UIntPtr.Zero, IntPtr.Zero))
{
throw new Exception("SetWindowSubclass failed!");
}
}
private IntPtr SubclassProc(IntPtr hWnd, WM msg, IntPtr wParam, IntPtr lParam, UIntPtr uIdSubclass, IntPtr dwRefData)
{
if (WindowMessage != null)
{
WindowMessage(this, new WMEventArgs(hWnd, msg, wParam, lParam));
}
if (msg == WM.NCDESTROY)
{
Dispose();
}
return(ComCtl32.DefSubclassProc(hWnd, msg, wParam, lParam));
}
public void Dispose()
{
if (FHwnd != IntPtr.Zero)
{
ComCtl32.RemoveWindowSubclass(FHwnd, FSubclassProcDelegate, UIntPtr.Zero);
FHwnd = IntPtr.Zero;
if (Disposed != null)
{
Disposed(this, EventArgs.Empty);
}
WindowMessage = null;
Disposed = null;
GC.SuppressFinalize(this);
}
}
private IntPtr SubclassProc(IntPtr hWnd, WM msg, UIntPtr wParam, IntPtr lParam, UIntPtr uIdSubclass, IntPtr dwRefData)
{
var handled = false;
if (WindowMessage != null)
{
var args = new WMEventArgs(hWnd, msg, wParam, lParam);
WindowMessage(this, args);
handled = args.Handled;
}
if (msg == WM.NCDESTROY)
{
Dispose();
}
if (!handled)
{
return(ComCtl32.DefSubclassProc(hWnd, msg, wParam, lParam));
}
else
{
return(IntPtr.Zero);
}
}