/// <summary>
/// Notifies the DragDropHelper that the specified Control received
/// a DragEnter event.
/// </summary>
/// <param name="control">The Control the received the DragEnter event.</param>
/// <param name="data">The DataObject containing a drag image.</param>
/// <param name="cursorOffset">The current cursor's offset relative to the window.</param>
/// <param name="effect">The accepted drag drop effect.</param>
public static void DragEnter(Control control, IDataObject data, System.Drawing.Point cursorOffset, DragDropEffects effect)
{
IntPtr controlHandle = IntPtr.Zero;
if (control != null)
{
controlHandle = control.Handle;
}
Win32Point pt = SwfDragDropLibExtensions.ToWin32Point(cursorOffset);
s_instance.DragEnter(controlHandle, (ComIDataObject)data, ref pt, (int)effect);
s_dataContext[control] = data;
}
/// <summary>
/// Notifies the DragDropHelper that the current Control received
/// a DragOver event.
/// </summary>
/// <param name="data">The DataObject containing a drag image.</param>
/// <param name="cursorOffset">The current cursor's offset relative to the window.</param>
/// <param name="effect">The accepted drag drop effect.</param>
public static void Drop(IDataObject data, System.Drawing.Point cursorOffset, DragDropEffects effect)
{
// No need to clear the drop description, but don't keep it stored to avoid memory leaks
foreach (KeyValuePair <Control, IDataObject> pair in s_dataContext)
{
if (object.ReferenceEquals(pair.Value, data))
{
s_dataContext.Remove(pair);
break;
}
}
Win32Point pt = SwfDragDropLibExtensions.ToWin32Point(cursorOffset);
s_instance.Drop((ComIDataObject)data, ref pt, (int)effect);
}
/// <summary>
/// Notifies the DragDropHelper that the current Control received
/// a DragOver event.
/// </summary>
/// <param name="cursorOffset">The current cursor's offset relative to the window.</param>
/// <param name="effect">The accepted drag drop effect.</param>
public static void DragOver(System.Drawing.Point cursorOffset, DragDropEffects effect)
{
Win32Point pt = SwfDragDropLibExtensions.ToWin32Point(cursorOffset);
s_instance.DragOver(ref pt, (int)effect);
}
