/// <summary>
/// Gets the current DropDescription's drop image type.
/// </summary>
/// <param name="dataObject">The DataObject.</param>
/// <returns>The current drop image type.</returns>
private static DropImageType GetDropImageType(IDataObject dataObject)
{
object data = ComDataObjectExtensions.GetDropDescription((System.Runtime.InteropServices.ComTypes.IDataObject)dataObject);
if (data is DropDescription)
{
return((DropImageType)((DropDescription)data).type);
}
return(DropImageType.Invalid);
}
/// <summary>
/// Checks if the current drop description, if any, is valid.
/// </summary>
/// <param name="dataObject">The DataObject from which to get the drop description.</param>
/// <returns>True if the drop description is set, and the
/// DropImageType is not DropImageType.Invalid.</returns>
private static bool IsDropDescriptionValid(IDataObject dataObject)
{
object data = ComDataObjectExtensions.GetDropDescription((Runtime.InteropServices.ComTypes.IDataObject)dataObject);
if (data is DropDescription)
{
return((DropImageType)((DropDescription)data).type != DropImageType.Invalid);
}
return(false);
}
/// <summary>
/// Handles DataChanged events from a COM IDataObject.
/// </summary>
/// <param name="format">The data format that had a change.</param>
/// <param name="stgmedium">The data value.</param>
public void OnDataChange(ref FORMATETC format, ref STGMEDIUM stgmedium)
{
// We listen to DropDescription changes, so that we can unset the IsDefault
// drop description flag.
object odd = ComDataObjectExtensions.GetDropDescription((System.Runtime.InteropServices.ComTypes.IDataObject)data);
if (odd != null)
{
SetDropDescriptionIsDefault(data, false);
}
}
