| private OleGetClipboard ( Microsoft &dataObject ) : int | ||
| dataObject | Microsoft | |
| return | int | |
/// <summary>
/// Determines if the paste command should be allowed.
/// </summary>
/// <returns></returns>
protected internal override bool AllowPasteCommand()
{
IOleDataObject dataObject = null;
try
{
ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out dataObject));
if (dataObject == null)
{
return(false);
}
// First see if this is a set of storage based items
FORMATETC format = DragDropHelper.CreateFormatEtc((ushort)DragDropHelper.CF_VSSTGPROJECTITEMS);
if (dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK)
{
return(true);
}
// Try reference based items
format = DragDropHelper.CreateFormatEtc((ushort)DragDropHelper.CF_VSREFPROJECTITEMS);
if (dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK)
{
return(true);
}
// Try windows explorer files format
format = DragDropHelper.CreateFormatEtc((ushort)NativeMethods.CF_HDROP);
return(dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK);
}
// We catch External exceptions since it might be that it is not our data on the clipboard.
catch (ExternalException e)
{
Trace.WriteLine("Exception :" + e.Message);
return(false);
}
}
/// <summary>
/// Empties all the data structures added to the clipboard and flushes the clipboard.
/// </summary>
private void CleanAndFlushClipboard()
{
IOleDataObject oleDataObject = null;
ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out oleDataObject));
if (oleDataObject == null)
{
return;
}
string sourceProjectPath = DragDropHelper.GetSourceProjectPath(oleDataObject);
if (!String.IsNullOrEmpty(sourceProjectPath) && NativeMethods.IsSamePath(sourceProjectPath, this.GetMkDocument()))
{
ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleFlushClipboard());
int clipboardOpened = 0;
try
{
ErrorHandler.ThrowOnFailure(clipboardOpened = UnsafeNativeMethods.OpenClipboard(IntPtr.Zero));
ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.EmptyClipboard());
}
finally
{
if (clipboardOpened == 1)
{
ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.CloseClipboard());
}
}
}
}
/// <summary>
/// Handle the Paste operation to a targetNode
/// </summary>
protected internal override int PasteFromClipboard(HierarchyNode targetNode)
{
int returnValue = (int)OleConstants.OLECMDERR_E_NOTSUPPORTED;
//Get the clipboardhelper service and use it after processing dataobject
IVsUIHierWinClipboardHelper clipboardHelper = (IVsUIHierWinClipboardHelper)GetService(typeof(SVsUIHierWinClipboardHelper));
if (clipboardHelper == null)
{
return(VSConstants.E_FAIL);
}
try
{
//Get dataobject from clipboard
IOleDataObject dataObject = null;
ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out dataObject));
if (dataObject == null)
{
return(VSConstants.E_UNEXPECTED);
}
DropEffect dropEffect = DropEffect.None;
DropDataType dropDataType = DropDataType.None;
try
{
dropDataType = this.ProcessSelectionDataObject(dataObject, targetNode.GetDragTargetHandlerNode());
dropEffect = this.QueryDropEffect(dropDataType, 0);
}
catch (ExternalException e)
{
Trace.WriteLine("Exception : " + e.Message);
// If it is a drop from windows and we get any kind of error ignore it. This
// prevents bogus messages from the shell from being displayed
if (dropDataType != DropDataType.Shell)
{
throw;
}
}
finally
{
// Inform VS (UiHierarchyWindow) of the paste
returnValue = clipboardHelper.Paste(dataObject, (uint)dropEffect);
}
}
catch (COMException e)
{
Trace.WriteLine("Exception : " + e.Message);
returnValue = e.ErrorCode;
}
return(returnValue);
}
