internal void ApplyChanges(TextEdit textEdit, List<ITextChange> changes, EditOptions options, int? reiteratedVersionNumber, object editTag) {
VerifyAccess();
if (textEdit != textEditInProgress)
throw new InvalidOperationException();
textEditInProgress = 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((a, b) => b.OldPosition - a.OldPosition);
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 beforeSnapshot = CurrentSnapshot;
Document.BeginUpdate();
// changes is sorted in reverse order by OldPosition
foreach (var change in changes)
Document.Replace(change.OldPosition, change.OldLength, change.NewText);
Document.EndUpdate();
CreateNewCurrentSnapshot(changes, reiteratedVersionNumber, Document.CreateSnapshot());
var afterSnapshot = CurrentSnapshot;
TextContentChangedEventArgs 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 TextContentChangedEventArgs(beforeSnapshot, afterSnapshot, options, editTag)));
Changed?.Invoke(this, args ?? (args = new TextContentChangedEventArgs(beforeSnapshot, afterSnapshot, options, editTag)));
ChangedLowPriority?.Invoke(this, args ?? (args = new TextContentChangedEventArgs(beforeSnapshot, afterSnapshot, options, editTag)));
}
PostChanged?.Invoke(this, EventArgs.Empty);
}
public ITextEdit CreateEdit(EditOptions options, int? reiteratedVersionNumber, object editTag) {
VerifyAccess();
if (EditInProgress)
throw new InvalidOperationException("An edit operation is in progress");
return textEditInProgress = new TextEdit(this, options, reiteratedVersionNumber, editTag);
}
internal void Cancel(TextEdit textEdit) {
VerifyAccess();
if (textEdit != textEditInProgress)
throw new InvalidOperationException();
textEditInProgress = null;
PostChanged?.Invoke(this, EventArgs.Empty);
}
