OpenTween.TweenMain.TweenMain_DragEnter C# (CSharp) Method

        private void TweenMain_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                if (!e.Data.GetDataPresent(DataFormats.Html, false))  // WebBrowserコントロールからの絵文字画像Drag&Dropは弾く
                {
                    SelectMedia_DragEnter(e);
                    return;
                }
            }
            else if (e.Data.GetDataPresent("UniformResourceLocatorW"))
            {
                e.Effect = DragDropEffects.Copy;
                return;
            }
            else if (e.Data.GetDataPresent(DataFormats.UnicodeText))
            {
                e.Effect = DragDropEffects.Copy;
                return;
            }
            else if (e.Data.GetDataPresent(DataFormats.StringFormat))
            {
                e.Effect = DragDropEffects.Copy;
                return;
            }

            e.Effect = DragDropEffects.None;
        }