VsTeXProject.VisualStudio.Project.ProjectNode.QueryDropDataType C# (CSharp) Method

        internal static DropDataType QueryDropDataType(IOleDataObject pDataObject)
        {
            if (pDataObject == null)
            {
                return DropDataType.None;
            }

            // known formats include File Drops (as from WindowsExplorer),
            // VSProject Reference Items and VSProject Storage Items.
            var fmt = DragDropHelper.CreateFormatEtc(NativeMethods.CF_HDROP);

            if (DragDropHelper.QueryGetData(pDataObject, ref fmt) == VSConstants.S_OK)
            {
                return DropDataType.Shell;
            }

            fmt.cfFormat = DragDropHelper.CF_VSREFPROJECTITEMS;
            if (DragDropHelper.QueryGetData(pDataObject, ref fmt) == VSConstants.S_OK)
            {
                // Data is from a Ref-based project.
                return DropDataType.VsRef;
            }

            fmt.cfFormat = DragDropHelper.CF_VSSTGPROJECTITEMS;
            if (DragDropHelper.QueryGetData(pDataObject, ref fmt) == VSConstants.S_OK)
            {
                return DropDataType.VsStg;
            }

            return DropDataType.None;
        }