private void tv1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
{
//Primary (internal) data type
ArrayList toDrag = new ArrayList();
CShItem csi = ((TreeNode)e.Item).Tag as CShItem;
toDrag.Add(csi);
//also need Shell IDList Array
System.IO.MemoryStream MS;
MS = CProcDataObject.MakeShellIDArray(toDrag);
//Fairly universal data type (must be an array)
string[] strD = new string[1];
strD[0] = csi.Path;
//Build data to drag
DataObject dataObj = new DataObject();
dataObj.SetData(toDrag);
if (MS != null)
{
dataObj.SetData("Shell IDList Array", true, MS);
}
dataObj.SetData("FileDrop", true, strD);
//Do drag, allowing Copy and Move
DragDropEffects ddeff;
ddeff = tv1.DoDragDrop(dataObj, DragDropEffects.Copy | DragDropEffects.Move);
//the following line commented out, since we can't depend on ddeff
//If ddeff = DragDropEffects.None Then Exit Sub 'nothing happened
RefreshNode(FindAncestorNode(csi));
}
public int DragLeave()
{
//Debug.WriteLine("In DragLeave")
m_Original_Effect = 0;
ResetPrevTarget();
int cnt = Marshal.Release(m_DragDataObj);
Debug.WriteLine("DragLeave: cnt = " + cnt);
m_DragDataObj = IntPtr.Zero;
m_OriginalRefCount = 0; //just in case
m_MyDataObject = null;
if (ShDragLeaveEvent != null)
{
ShDragLeaveEvent();
}
return(0);
}
public int DragEnter(IntPtr pDataObj, int grfKeyState, Point pt, ref int pdwEffect)
{
Debug.WriteLine("In DragEnter: Effect = " + pdwEffect + " Keystate = " + grfKeyState);
m_Original_Effect = pdwEffect;
m_DragDataObj = pDataObj;
m_OriginalRefCount = Marshal.AddRef(m_DragDataObj); //note: includes our count
Debug.WriteLine("DragEnter: pDataObj RefCnt = " + m_OriginalRefCount);
m_MyDataObject = new CProcDataObject(pDataObj);
if (m_MyDataObject.IsValid)
{
m_DropList = m_MyDataObject.DragList;
if (ShDragEnterEvent != null)
{
ShDragEnterEvent(m_DropList, pDataObj, grfKeyState, pdwEffect);
}
}
else
{
pdwEffect = (int)System.Windows.Forms.DragDropEffects.None;
}
return(0);
}
public int DragLeave()
{
//Debug.WriteLine("In DragLeave")
m_Original_Effect = 0;
ResetPrevTarget();
int cnt = Marshal.Release(m_DragDataObj);
Debug.WriteLine("DragLeave: cnt = " + cnt);
m_DragDataObj = IntPtr.Zero;
m_OriginalRefCount = 0; //just in case
m_MyDataObject = null;
if (ShDragLeaveEvent != null)
ShDragLeaveEvent();
return 0;
}
public int DragEnter(IntPtr pDataObj, int grfKeyState, Point pt, ref int pdwEffect)
{
Debug.WriteLine("In DragEnter: Effect = " + pdwEffect + " Keystate = " + grfKeyState);
m_Original_Effect = pdwEffect;
m_DragDataObj = pDataObj;
m_OriginalRefCount = Marshal.AddRef(m_DragDataObj); //note: includes our count
Debug.WriteLine("DragEnter: pDataObj RefCnt = " + m_OriginalRefCount);
m_MyDataObject = new CProcDataObject(pDataObj);
if (m_MyDataObject.IsValid)
{
m_DropList = m_MyDataObject.DragList;
if (ShDragEnterEvent != null)
ShDragEnterEvent(m_DropList, pDataObj, grfKeyState, pdwEffect);
}
else
{
pdwEffect = (int)System.Windows.Forms.DragDropEffects.None;
}
return 0;
}
