/// <summary>
/// Replaces the current version with a new version.
/// </summary>
/// <param name="change">Change from current version to new version</param>
public void AppendChange(TextChangeEventArgs change)
{
if (change == null)
throw new ArgumentNullException("change");
currentVersion.change = change;
currentVersion.next = new Version(currentVersion);
currentVersion = currentVersion.next;
}
void PerformChange(TextChangeEventArgs change)
{
// Ensure that all changes take place inside an update group.
// Will also take care of throwing an exception if isInChange is set.
StartUndoableAction();
try
{
isInChange = true;
try
{
if (TextChanging != null)
{
TextChanging(this, change);
}
// Perform changes to document and Version property
documentSnapshot = null;
cachedText = null;
b.Remove(change.Offset, change.RemovalLength);
b.Insert(change.Offset, change.InsertedText.Text);
versionProvider.AppendChange(change);
// Update anchors and fire Deleted events
UpdateAnchors(change);
if (TextChanged != null)
{
TextChanged(this, change);
}
}
finally
{
isInChange = false;
}
}
finally
{
EndUndoableAction();
}
}
public void Update(TextChangeEventArgs change)
{
if (SurviveDeletion || offset <= change.Offset || offset >= change.Offset + change.RemovalLength) {
offset = change.GetNewOffset(offset, MovementType);
} else {
offset = -1;
}
}
void UpdateAnchors(TextChangeEventArgs change)
{
// First update all anchors, then fire the deleted events.
List<int> deletedAnchors = new List<int>();
for (int i = 0; i < anchors.Count; i++) {
var anchor = anchors[i].Target as SimpleAnchor;
if (anchor != null) {
anchor.Update(change);
if (anchor.IsDeleted)
deletedAnchors.Add(i);
}
}
deletedAnchors.Reverse();
foreach (var index in deletedAnchors) {
var anchor = anchors[index].Target as SimpleAnchor;
if (anchor != null)
anchor.RaiseDeletedEvent();
anchors.RemoveAt(index);
}
}
void PerformChange(TextChangeEventArgs change)
{
// Ensure that all changes take place inside an update group.
// Will also take care of throwing an exception if isInChange is set.
StartUndoableAction();
try {
isInChange = true;
try {
if (TextChanging != null)
TextChanging(this, change);
// Perform changes to document and Version property
documentSnapshot = null;
cachedText = null;
b.Remove(change.Offset, change.RemovalLength);
b.Insert(change.Offset, change.InsertedText.Text);
versionProvider.AppendChange(change);
// Update anchors and fire Deleted events
UpdateAnchors(change);
if (TextChanged != null)
TextChanged(this, change);
} finally {
isInChange = false;
}
} finally {
EndUndoableAction();
}
}
/// <summary>
/// Replaces the current version with a new version.
/// </summary>
/// <param name="change">Change from current version to new version</param>
public void AppendChange(TextChangeEventArgs change)
{
currentVersion.change = change ?? throw new ArgumentNullException("change");
currentVersion.next = new Version(currentVersion);
currentVersion = currentVersion.next;
}
public TextChangingEvent(TextChangeEventArgs args)
{
this.args = args;
}
