//http://blogs.msdn.com/jaimer/archive/2007/07/12/drag-drop-in-wpf-explained-end-to-end.aspx
static void StartDrag(object sender, MouseEventArgs e)
{
UIElement control = sender as UIElement;
draggingControl = control;
try
{
control.QueryContinueDrag += new QueryContinueDragEventHandler(OnQueryContinueDrag);
//control.AllowDrop = false;
FileSystemInfoEx[] selectionList = getSelectedItems(sender);
if (selectionList.Length > 0)
{
dataObj = new DataObjectEx(selectionList);
dataObj.SetData(DataFormats.FileDrop, dataObj.PathnameList());
dataObj.SetData(DataObjectEx.DataFormats_EntryString, dataObj.PathnameList());
dataObj.SetData(ShellClipboardFormats.CFSTR_PREFERREDDROPEFFECT, DragDropEffects.Copy);
dataObj.SetData(ShellClipboardFormats.CFSTR_INDRAGLOOP, 1);
DragDropEffects de = System.Windows.DragDrop.DoDragDrop(control, dataObj, DragDropEffects.Copy);
}
}
finally
{
draggingControl = null;
SetIsDragOver(null);
}
}
public static void DoDragAndDrop(Control dragSource, IEnumerable <DragFileInfo> files)
{
var dataObject = new DataObjectEx();
var fileDescriptors = new List <FileDescriptor>();
var i = 0;
foreach (var file in files)
{
dataObject.SetFileContents(file.Stream, i);
fileDescriptors.Add(new FileDescriptor
{
cFileName = file.FileName,
nFileSizeHigh = (uint)(file.Stream.Length >> 32),
nFileSizeLow = (uint)(file.Stream.Length & 0xFFFFFFFF),
dwFlags = FileDescriptorFlags.FileSize | FileDescriptorFlags.ProgressUi
});
++i;
}
var fileGroupDescriptor = new FileGroupDescriptor(fileDescriptors.Count);
var descriptorSize = Marshal.SizeOf(fileGroupDescriptor) +
Marshal.SizeOf <FileDescriptor>() * fileDescriptors.Count;
using (var descriptorStream = new MemoryStream(descriptorSize))
{
StructToArray(fileGroupDescriptor, descriptorStream);
foreach (var descriptor in fileDescriptors)
{
StructToArray(descriptor, descriptorStream);
}
dataObject.SetData("FileGroupDescriptorW", descriptorStream);
dragSource.DoDragDrop(dataObject, DragDropEffects.Copy);
}
}
private static void OnQueryContinueDrag(object sender, QueryContinueDragEventArgs e)
{
UIElement uiSender = sender as UIElement;
//ESC pressed
if (e.EscapePressed)
{
e.Action = DragAction.Cancel;
uiSender.AllowDrop = true;
return;
}
//Drop!
if (e.KeyStates == DragDropKeyStates.None)
{
dataObj.SetData(ShellClipboardFormats.CFSTR_INDRAGLOOP, 0);
e.Action = DragAction.Drop;
uiSender.AllowDrop = true;
return;
}
e.Action = DragAction.Continue;
//base.OnQueryContinueDrag(e);
}