public int OleDragLeave()
{
this._converterInfo = DataObjectConverterInfo.Disabled;
if (this._currentDataObj != null)
{
this._currentDataObj = null;
Marshal.Release(this._currentDataObjPtr);
this._currentDataObjPtr = IntPtr.Zero;
return this._originalDropTarget.OleDragLeave();
}
return 0;
}
public int OleDrop(IntPtr pDataObj, int grfKeyState, long pt, ref int pdwEffect)
{
int num = 0;
Control parent = this._owner;
while (parent != null)
{
parent = parent.Parent;
Form form = parent as Form;
if (form != null)
{
form.BringToFront();
break;
}
}
if (this._converterInfo == DataObjectConverterInfo.CanConvert)
{
DataObject originalDataObject = new DataObject(Marshal.GetObjectForIUnknown(pDataObj));
if (this._converter.ConvertToHtml(originalDataObject, this._currentDataObj))
{
IntPtr iUnknownForObject = Marshal.GetIUnknownForObject(this._currentDataObj);
Guid iid = new Guid("0000010E-0000-0000-C000-000000000046");
Marshal.QueryInterface(iUnknownForObject, ref iid, out this._currentDataObjPtr);
num = this._originalDropTarget.OleDrop(this._currentDataObjPtr, grfKeyState, pt, ref pdwEffect);
Marshal.Release(this._currentDataObjPtr);
this._currentDataObj = null;
this._currentDataObjPtr = IntPtr.Zero;
}
else
{
pdwEffect = 0;
}
}
else if (this._converterInfo == DataObjectConverterInfo.Unhandled)
{
num = this._originalDropTarget.OleDrop(pDataObj, grfKeyState, pt, ref pdwEffect);
}
this._converterInfo = DataObjectConverterInfo.Disabled;
return num;
}
public int OleDragEnter(IntPtr pDataObj, int grfKeyState, long pt, ref int pdwEffect)
{
DataObject dataObject = new DataObject(Marshal.GetObjectForIUnknown(pDataObj));
this._converterInfo = this._converter.CanConvertToHtml(dataObject);
if (this._converterInfo == DataObjectConverterInfo.CanConvert)
{
this._currentDataObj = new DataObject(DataFormats.Html, string.Empty);
IntPtr iUnknownForObject = Marshal.GetIUnknownForObject(this._currentDataObj);
Guid iid = new Guid("0000010E-0000-0000-C000-000000000046");
Marshal.QueryInterface(iUnknownForObject, ref iid, out this._currentDataObjPtr);
Marshal.Release(iUnknownForObject);
return this._originalDropTarget.OleDragEnter(this._currentDataObjPtr, grfKeyState, pt, ref pdwEffect);
}
if (this._converterInfo == DataObjectConverterInfo.Disabled)
{
pdwEffect = 0;
}
else if (this._converterInfo == DataObjectConverterInfo.Unhandled)
{
return this._originalDropTarget.OleDragEnter(pDataObj, grfKeyState, pt, ref pdwEffect);
}
return 0;
}
