public async Task <ReturnResult> Undo(IStorageHistory history)
{
ReturnResult returnStatus = ReturnResult.InProgress;
Progress <FileSystemStatusCode> errorCode = new Progress <FileSystemStatusCode>();
errorCode.ProgressChanged += (s, e) => returnStatus = e.ToStatus();
switch (history.OperationType)
{
case FileOperationType.CreateNew: // CreateNew PASS
{
// Opposite: Delete created items
if (IsHistoryNull(history.Source))
{
break;
}
return(await filesystemHelpers.DeleteItemsAsync(history.Source, false, true, false));
}
case FileOperationType.Rename: // Rename PASS
{
// Opposite: Restore original item names
if (IsHistoryNull(history))
{
break;
}
NameCollisionOption collision = NameCollisionOption.GenerateUniqueName;
for (int i = 0; i < history.Destination.Count(); i++)
{
await filesystemOperations.RenameAsync(
history.Destination.ElementAt(i),
Path.GetFileName(history.Source.ElementAt(i).Path),
collision,
errorCode,
cancellationToken);
}
break;
}
case FileOperationType.Copy: // Copy PASS
{
// Opposite: Delete copied items
if (IsHistoryNull(history.Destination))
{
break;
}
return(await filesystemHelpers.DeleteItemsAsync(history.Destination, false, true, false));
}
case FileOperationType.Move: // Move PASS
{
// Opposite: Move the items to original directory
if (IsHistoryNull(history))
{
break;
}
return(await filesystemHelpers.MoveItemsAsync(history.Destination, history.Source.Select((item) => item.Path), false, false));
}
case FileOperationType.Extract: // Extract PASS
{
// Opposite: No opposite for archive extraction
returnStatus = ReturnResult.Success;
Debugger.Break();
break;
}
case FileOperationType.Recycle: // Recycle PASS
{
// Opposite: Restore recycled items
if (IsHistoryNull(history))
{
break;
}
for (int i = 0; i < history.Destination.Count(); i++)
{
returnStatus = await filesystemHelpers.RestoreFromTrashAsync(
history.Destination.ElementAt(i),
history.Source.ElementAt(i).Path,
false);
}
if (returnStatus == ReturnResult.IntegrityCheckFailed) // Not found, corrupted
{
App.HistoryWrapper.RemoveHistory(history, false);
}
break;
}
case FileOperationType.Restore: // Restore PASS
{
// Opposite: Move restored items to Recycle Bin
if (IsHistoryNull(history.Destination))
{
break;
}
List <IStorageHistory> rawStorageHistory = new List <IStorageHistory>();
for (int i = 0; i < history.Destination.Count(); i++)
{
rawStorageHistory.Add(await filesystemOperations.DeleteAsync(
history.Destination.ElementAt(i),
null,
errorCode,
false,
cancellationToken));
}
if (rawStorageHistory.TrueForAll((item) => item != null))
{
IStorageHistory newHistory = new StorageHistory(
FileOperationType.Restore,
rawStorageHistory.SelectMany((item) => item?.Destination).ToList(),
rawStorageHistory.SelectMany((item) => item?.Source).ToList());
// We need to change the recycled item paths (since IDs are different) - for Redo() to work
App.HistoryWrapper.ModifyCurrentHistory(newHistory);
}
else
{
App.HistoryWrapper.RemoveHistory(history, false);
}
break;
}
case FileOperationType.Delete: // Delete PASS
{
// Opposite: No opposite for pernament deletion
returnStatus = ReturnResult.Success;
break;
}
}
return(returnStatus);
}
public async Task <ReturnResult> Undo(IStorageHistory history)
{
ReturnResult returnStatus = ReturnResult.InProgress;
Progress <FileSystemStatusCode> errorCode = new();
errorCode.ProgressChanged += (s, e) => returnStatus = e.ToStatus();
switch (history.OperationType)
{
case FileOperationType.CreateNew: // Opposite: Delete created items
if (!IsHistoryNull(history.Source))
{
return(await helpers.DeleteItemsAsync(history.Source, false, true, false));
}
break;
case FileOperationType.CreateLink: // Opposite: Delete created items
if (!IsHistoryNull(history.Destination))
{
return(await helpers.DeleteItemsAsync(history.Destination, false, true, false));
}
break;
case FileOperationType.Rename: // Opposite: Restore original item names
if (!IsHistoryNull(history))
{
NameCollisionOption collision = NameCollisionOption.GenerateUniqueName;
for (int i = 0; i < history.Destination.Count(); i++)
{
string name = Path.GetFileName(history.Source[i].Path);
await operations.RenameAsync(history.Destination[i], name, collision, errorCode, cancellationToken);
}
}
break;
case FileOperationType.Copy: // Opposite: Delete copied items
if (!IsHistoryNull(history.Destination))
{
return(await helpers.DeleteItemsAsync(history.Destination, false, true, false));
}
break;
case FileOperationType.Move: // Opposite: Move the items to original directory
if (!IsHistoryNull(history))
{
return(await helpers.MoveItemsAsync(history.Destination, history.Source.Select(item => item.Path), false, false));
}
break;
case FileOperationType.Extract: // Opposite: No opposite for archive extraction
returnStatus = ReturnResult.Success;
Debugger.Break();
break;
case FileOperationType.Recycle: // Opposite: Restore recycled items
if (!IsHistoryNull(history))
{
returnStatus = await helpers.RestoreItemsFromTrashAsync(history.Destination, history.Source.Select(item => item.Path), false);
if (returnStatus is ReturnResult.IntegrityCheckFailed) // Not found, corrupted
{
App.HistoryWrapper.RemoveHistory(history, false);
}
}
break;
case FileOperationType.Restore: // Opposite: Move restored items to Recycle Bin
if (!IsHistoryNull(history.Destination))
{
var newHistory = await operations.DeleteItemsAsync(history.Destination, null, errorCode, false, cancellationToken);
if (newHistory is null)
{
App.HistoryWrapper.RemoveHistory(history, false);
}
else
{
// We need to change the recycled item paths (since IDs are different) - for Redo() to work
App.HistoryWrapper.ModifyCurrentHistory(newHistory);
}
}
break;
case FileOperationType.Delete: // Opposite: No opposite for pernament deletion
returnStatus = ReturnResult.Success;
break;
}
return(returnStatus);
}