/// Takes current text buffer and new text then builds list of changed
/// regions and applies them to the buffer. This way we can avoid
/// destruction of bookmarks and other markers. Complete
/// buffer replacement deletes all markers which causes
/// loss of bookmarks, breakpoints and other similar markers.
public static void ApplyChange(
ITextBuffer textBuffer,
int position,
int length,
string newText,
string transactionName,
ISelectionTracker selectionTracker,
int maxMilliseconds)
{
var snapshot = textBuffer.CurrentSnapshot;
int oldLength = Math.Min(length, snapshot.Length - position);
string oldText = snapshot.GetText(position, oldLength);
var changes = TextChanges.BuildChangeList(oldText, newText, maxMilliseconds);
if (changes != null && changes.Count > 0)
{
using (var selectionUndo = new SelectionUndo(selectionTracker, transactionName, automaticTracking: false)) {
using (ITextEdit edit = textBuffer.CreateEdit()) {
// Replace ranges in reverse so relative positions match
for (int i = changes.Count - 1; i >= 0; i--)
{
TextChange tc = changes[i];
edit.Replace(tc.Position + position, tc.Length, tc.NewText);
}
edit.Apply();
}
}
}
}
private IList <TextChange> BuildChangeList(string oldText, string newText)
{
return(TextChanges.BuildChangeList(oldText, newText, int.MaxValue));
}
