/// <summary>
/// Handles the Changed event of the TextBuffer control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">
/// The <see cref="TextContentChangedEventArgs" />
/// instance containing the event data.
/// </param>
/// <param name="docId">The document id.</param>
private void TextChanged(object sender, TextContentChangedEventArgs e, string docId)
{
var doc = this.Documents[docId];
if (doc.BlockEvent)
{
return;
}
foreach (var change in e.Changes)
{
var tick = (long)doc.TickStamp;
lock (doc.OpLocker)
{
if (!change.OldText.IsNullOrEmpty())
{
var model = new OpDeleteMessage()
{
Service = "op",
MessageType = "delete",
User = this.UserName,
Index = change.OldPosition,
ReplacementLength = change.OldLength,
OldContent = change.OldText,
DocumentId = docId,
OpId = doc.OpId,
TickStamp = tick,
IsApplied = true,
LocalCount = doc.LocalCount,
RemoteCount = doc.RemoteCount
};
doc.LocalCount++;
doc.Changes.Add(model);
this.SendMessage(model);
}
if (!change.NewText.IsNullOrEmpty())
{
var model = new OpInsertMessage()
{
Service = "op",
MessageType = "insert",
User = this.UserName,
Index = change.NewPosition,
Content = change.NewText,
DocumentId = docId,
OpId = doc.OpId,
TickStamp = tick,
IsApplied = true,
LocalCount = doc.LocalCount,
RemoteCount = doc.RemoteCount
};
doc.LocalCount++;
doc.Changes.Add(model);
this.SendMessage(model);
}
}
}
}
/// <summary>
/// Undoes a delete operation.
/// </summary>
/// <param name="model">The model.</param>
private void UndoDelete(DocumentModel doc, OpDeleteMessage model, ITextEdit edit)
{
//doc.BlockEvent = true;
edit.Insert(model.Index, model.OldContent);
}
/// <summary>
/// Performs a delete in a document.
/// </summary>
/// <param name="model">The model.</param>
private void Delete(DocumentModel doc, OpDeleteMessage model, ITextEdit edit)
{
//doc.BlockEvent = true;
var len = model.End - model.Index;
if (len > doc.View.TextBuffer.CurrentSnapshot.Length)
{
len = edit.Snapshot.Length;
}
var span = new Span(model.Index, len);
edit.Delete(span);
}