public override HexEdit CreateEdit(int?reiteratedVersionNumber, object editTag)
{
VerifyAccess();
if (EditInProgress)
{
throw new InvalidOperationException("An edit operation is in progress");
}
return(hexEditInProgress = new HexEditImpl(this, reiteratedVersionNumber, editTag));
}
internal void Cancel(HexEditImpl hexEdit)
{
VerifyAccess();
if (hexEdit != hexEditInProgress)
{
throw new InvalidOperationException();
}
hexEditInProgress = null;
PostChanged?.Invoke(this, EventArgs.Empty);
}
internal void ApplyChanges(HexEditImpl hexEdit, List <HexChange> changes, int?reiteratedVersionNumber, object editTag)
{
VerifyAccess();
if (hexEdit != hexEditInProgress)
{
throw new InvalidOperationException();
}
hexEditInProgress = null;
if (RaiseChangingGetIsCanceled(editTag))
{
PostChanged?.Invoke(this, EventArgs.Empty);
return;
}
if (changes.Count != 0)
{
// We don't support overlapping changes. All offsets are relative to the original buffer
changes.Sort(ReverseOldPositionSorter.Instance);
for (int i = 1; i < changes.Count; i++)
{
if (changes[i - 1].OldSpan.OverlapsWith(changes[i].OldSpan))
{
throw new InvalidOperationException("Two edit operations overlap");
}
}
var beforeVersion = Version;
// changes is sorted in reverse order by OldPosition
foreach (var change in changes)
{
stream.Write(change.OldPosition, change.NewData);
}
CreateNewVersion(changes, reiteratedVersionNumber);
var afterVersion = Version;
HexContentChangedEventArgs args = null;
//TODO: The event handlers are allowed to modify the buffer, but the new events must only be
// raised after all of these three events have been raised.
ChangedHighPriority?.Invoke(this, args ?? (args = new HexContentChangedEventArgs(beforeVersion, afterVersion, editTag)));
Changed?.Invoke(this, args ?? (args = new HexContentChangedEventArgs(beforeVersion, afterVersion, editTag)));
ChangedLowPriority?.Invoke(this, args ?? (args = new HexContentChangedEventArgs(beforeVersion, afterVersion, editTag)));
}
PostChanged?.Invoke(this, EventArgs.Empty);
}