private static IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
{
const string propertyName = "Sunburst.Win32UI.Control";
if (msg == WindowMessages.WM_NCCREATE)
{
CREATESTRUCT createStruct = Marshal.PtrToStructure <CREATESTRUCT>(lParam);
NativeMethods.SetProp(hWnd, propertyName, createStruct.lpCreateParams);
}
IntPtr instanceHandle = NativeMethods.GetProp(hWnd, propertyName);
if (instanceHandle == IntPtr.Zero)
{
// If we haven't received WM_NCCREATE yet, there's not much we can do here.
return(NativeMethods.DefWindowProc(hWnd, msg, wParam, lParam));
}
ControlNativeWindow instance = (ControlNativeWindow)GCHandle.FromIntPtr(instanceHandle).Target;
Message m = new Message(hWnd, msg, wParam, lParam);
instance.Owner.CallWndProc(ref m);
if (msg == WindowMessages.WM_NCDESTROY)
{
GCHandle.FromIntPtr(instanceHandle).Free();
NativeMethods.RemoveProp(hWnd, propertyName);
}
return(m.Result);
}
public static ControlNativeWindow SubclassWindow(Control owner, IntPtr hWnd, bool ownsHandle)
{
if (owner == null)
{
throw new ArgumentNullException(nameof(owner));
}
if (!NativeMethods.IsWindow(hWnd))
{
throw new ArgumentException("not a valid HWND", nameof(hWnd));
}
ControlNativeWindow nativeWindow = new ControlNativeWindow(owner, hWnd, ownsHandle);
IntPtr wndProc = Marshal.GetFunctionPointerForDelegate((WNDPROC)WndProc);
const int GWLP_WNDPROC = 0;
nativeWindow.superclassWndProc = NativeMethods.GetWindowLongPtr(hWnd, GWLP_WNDPROC);
GCHandle gcHandle = GCHandle.Alloc(nativeWindow);
NativeMethods.SetProp(hWnd, "Sunburst.Win32UI.Control", GCHandle.ToIntPtr(gcHandle));
NativeMethods.SetWindowLongPtr(hWnd, GWLP_WNDPROC, wndProc);
return(nativeWindow);
}
public static ControlNativeWindow Create(Control owner, CreateParams createParams)
{
if (owner == null)
{
throw new ArgumentNullException(nameof(owner));
}
if (createParams == null)
{
throw new ArgumentNullException(nameof(createParams));
}
ControlNativeWindow nativeWindow = new ControlNativeWindow(owner);
WindowClass windowClass = WindowClass.GetWindowClass(createParams.ClassName, createParams.ClassStyle);
IntPtr wndProc = Marshal.GetFunctionPointerForDelegate((WNDPROC)WndProc);
string fullClassName = windowClass.Register(wndProc, out nativeWindow.superclassWndProc);
GCHandle gcHandle = GCHandle.Alloc(nativeWindow);
var frame = createParams.Frame;
nativeWindow.Handle = NativeMethods.CreateWindowEx(createParams.ExtendedStyle, fullClassName,
createParams.Caption, createParams.Style, frame.left, frame.top, frame.Width, frame.Height,
createParams.ParentHandle, IntPtr.Zero, IntPtr.Zero, GCHandle.ToIntPtr(gcHandle));
return(nativeWindow);
}
