/// <summary>
/// Begins a drag-and-drop operation, with an image attached.
/// </summary>
/// <param name="data">The data to drag.</param>
/// <param name="allowedEffects">One of the DragDropEffects values.</param>
/// <param name="dragImage">The image to attach to the cursor</param>
/// <param name="cursorOffset">The offset within the image that the cursor attaches to.</param>
/// <returns>A value from the DragDropEffects enumeration that represents the final effect that was performed during the drag-and-drop operation.</returns>
public DragDropEffects DoDragDrop(object data, DragDropEffects allowedEffects, Bitmap dragImage, Point cursorOffset)
{
var adviseConnection = 0;
try
{
DragDropHelper.SetFlags(1);
// Create IDataObject
m_dragData = new DragDropDataObject();
// attach image if we have one.
if (dragImage != null)
{
DragDropHelper.InitializeFromBitmap(m_dragData, dragImage, cursorOffset);
}
// We need to listen for drop description changes. If a drop target
// changes the drop description, we shouldn't provide a default one.
var formatEtc = OleConverter.CreateFormat("DropDescription");
var hr = m_dragData.DAdvise(ref formatEtc, 0, new AdviseSink(m_dragData), out adviseConnection);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
// associate data with it.
m_dragData.SetData("DragDropExtender", this);
m_dragData.SetData(data);
m_owner.GiveFeedback += OnGiveFeedback;
m_owner.QueryContinueDrag += OnQueryContinueDrag;
return(m_owner.DoDragDrop(m_dragData, allowedEffects));
}
finally
{
m_owner.GiveFeedback -= OnGiveFeedback;
m_owner.QueryContinueDrag -= OnQueryContinueDrag;
if (m_dragData != null)
{
// Stop listening to drop description changes
m_dragData.DUnadvise(adviseConnection);
m_dragData.Dispose();
m_dragData = null;
}
}
}
/// <summary>
/// Begins a drag-and-drop operation, with an image attached.
/// </summary>
/// <param name="data">The data to drag.</param>
/// <param name="allowedEffects">One of the DragDropEffects values.</param>
/// <param name="dragImage">The image to attach to the cursor</param>
/// <param name="cursorOffset">The offset within the image that the cursor attaches to.</param>
/// <returns>A value from the DragDropEffects enumeration that represents the final effect that was performed during the drag-and-drop operation.</returns>
public DragDropEffects DoDragDrop(object data, DragDropEffects allowedEffects, Bitmap dragImage, Point cursorOffset)
{
var adviseConnection = 0;
try
{
DragDropHelper.SetFlags(1);
// Create IDataObject
m_dragData = new DragDropDataObject();
// attach image if we have one.
if (dragImage != null)
{
DragDropHelper.InitializeFromBitmap(m_dragData, dragImage, cursorOffset);
}
// We need to listen for drop description changes. If a drop target
// changes the drop description, we shouldn't provide a default one.
var formatEtc = OleConverter.CreateFormat("DropDescription");
var hr = m_dragData.DAdvise(ref formatEtc, 0, new AdviseSink(m_dragData), out adviseConnection);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
// associate data with it.
m_dragData.SetData("DragDropExtender", this);
m_dragData.SetData(data);
m_owner.GiveFeedback += OnGiveFeedback;
m_owner.QueryContinueDrag += OnQueryContinueDrag;
return m_owner.DoDragDrop(m_dragData, allowedEffects);
}
finally
{
m_owner.GiveFeedback -= OnGiveFeedback;
m_owner.QueryContinueDrag -= OnQueryContinueDrag;
if (m_dragData != null)
{
// Stop listening to drop description changes
m_dragData.DUnadvise(adviseConnection);
m_dragData.Dispose();
m_dragData = null;
}
}
}
