/// 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();
}
}
}
}
/// 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();
}
}
}
}
/// <summary>
/// Incrementally applies whitespace change to the buffer
/// having old and new tokens produced from the 'before formatting'
/// and 'after formatting' versions of the same text.
/// </summary>
/// <param name="textBuffer">Text buffer to apply changes to</param>
/// <param name="newTextProvider">Text provider of the text fragment before formatting</param>
/// <param name="newTextProvider">Text provider of the formatted text</param>
/// <param name="oldTokens">Tokens from the 'before' text fragment</param>
/// <param name="newTokens">Tokens from the 'after' text fragment</param>
/// <param name="formatRange">Range that is being formatted in the text buffer</param>
/// <param name="transactionName">Name of the undo transaction to open</param>
/// <param name="selectionTracker">Selection tracker object that will save, track
/// <param name="additionalAction">Action to perform after changes are applies by undo unit is not yet closed.</param>
/// and restore selection after changes have been applied.</param>
public static void ApplyChangeByTokens(
ITextBuffer textBuffer,
ITextProvider oldTextProvider,
ITextProvider newTextProvider,
IReadOnlyList <ITextRange> oldTokens,
IReadOnlyList <ITextRange> newTokens,
ITextRange formatRange,
string transactionName,
ISelectionTracker selectionTracker,
Action additionalAction = null)
{
Debug.Assert(oldTokens.Count == newTokens.Count);
if (oldTokens.Count == newTokens.Count)
{
ITextSnapshot snapshot = textBuffer.CurrentSnapshot;
using (var selectionUndo = new SelectionUndo(selectionTracker, transactionName, automaticTracking: false)) {
using (ITextEdit edit = textBuffer.CreateEdit()) {
if (oldTokens.Count > 0)
{
// Replace whitespace between tokens in reverse so relative positions match
int oldEnd = oldTextProvider.Length;
int newEnd = newTextProvider.Length;
string oldText, newText;
for (int i = newTokens.Count - 1; i >= 0; i--)
{
oldText = oldTextProvider.GetText(TextRange.FromBounds(oldTokens[i].End, oldEnd));
newText = newTextProvider.GetText(TextRange.FromBounds(newTokens[i].End, newEnd));
if (oldText != newText)
{
edit.Replace(formatRange.Start + oldTokens[i].End, oldEnd - oldTokens[i].End, newText);
}
oldEnd = oldTokens[i].Start;
newEnd = newTokens[i].Start;
}
newText = newTextProvider.GetText(TextRange.FromBounds(0, newEnd));
edit.Replace(formatRange.Start, oldEnd, newText);
}
else
{
string newText = newTextProvider.GetText(TextRange.FromBounds(0, newTextProvider.Length));
edit.Replace(formatRange.Start, formatRange.Length, newText);
}
edit.Apply();
additionalAction?.Invoke();
}
}
}
}
