public IDictionary<TextPosition, TextPosition> CreateFolds(string text, TextPosition position, IDictionary<TextPosition, TextPosition> foldingPositions) {
if (text == GetOpeningTag()) {
return CreateEmptyFold(position, foldingPositions);
}
return text == GetClosingTag() ? RebuildFolds(position, foldingPositions) : null;
}
public void Deselect() {
lastSelectionStart = null;
lastSelectionEnd = null;
isSelecting = false;
visuals.Clear();
}
public TextPosition GetSelectionPosition(KeyEventArgs keyboardEvent) {
TextPosition endingPosition = null;
switch (keyboardEvent.Key) {
case Key.Left:
endingPosition = new TextPosition(column: caretViewReader.CaretPosition.Column - 1, line: caretViewReader.CaretPosition.Line);
break;
case Key.Home:
endingPosition = new TextPosition(column: 0, line: caretViewReader.CaretPosition.Line);
break;
case Key.Right:
endingPosition = new TextPosition(column: caretViewReader.CaretPosition.Column + 1, line: caretViewReader.CaretPosition.Line);
break;
case Key.End:
endingPosition = new TextPosition(column: textViewReader.GetLineLength(caretViewReader.CaretPosition.Line), line: caretViewReader.CaretPosition.Line);
break;
case Key.Up:
endingPosition = new TextPosition(column: caretViewReader.CaretPosition.Column, line: caretViewReader.CaretPosition.Line - 1);
break;
case Key.PageUp:
endingPosition = new TextPosition(column: caretViewReader.CaretPosition.Column, line: caretViewReader.CaretPosition.Line - GlobalConstants.PageSize);
break;
case Key.Down:
endingPosition = new TextPosition(column: caretViewReader.CaretPosition.Column, line: caretViewReader.CaretPosition.Line + 1);
break;
case Key.PageDown:
endingPosition = new TextPosition(column: caretViewReader.CaretPosition.Column, line: caretViewReader.CaretPosition.Line + GlobalConstants.PageSize);
break;
}
return endingPosition;
}
private IEnumerable<PointsPair> GetSelectionPointsForward(TextPosition start, TextPosition end) {
var pairs = new List<PointsPair>();
for (var i = start.Line; i <= end.Line; i++) {
var tmpStartColumn = 0;
var tmpStartLine = i;
var tmpEndColumn = 0;
var tmpEndLine = i;
if (i == start.Line) {
tmpStartColumn = start.Column;
}
var lineLen = textViewReader.GetLineLength(i);
if (i == end.Line) {
tmpEndColumn = end.Column > lineLen ? lineLen : end.Column;
} else {
tmpEndColumn = lineLen;
}
pairs.Add(new PointsPair {
StartingPoint = (new TextPosition(column: tmpStartColumn, line: tmpStartLine)).GetPositionRelativeToParent(TextConfiguration.GetCharSize())
.AlignToVisualLineTop(TextConfiguration.GetCharSize()),
EndingPoint = (new TextPosition(column: tmpEndColumn, line: tmpEndLine)).GetPositionRelativeToParent(TextConfiguration.GetCharSize())
.AlignToVisualLineBottom(TextConfiguration.GetCharSize())
});
}
return pairs;
}
public void Execute(object parameter) {
var keyboardEvent = parameter as KeyEventArgs;
var mouseEvent = parameter as MouseButtonEventArgs;
TextPosition newPos = null;
if (keyboardEvent != null) {
newPos = caretView.GetNextPosition(keyboardEvent.Key);
keyboardEvent.Handled = true;
} else if (mouseEvent != null) {
newPos = mouseEvent.GetPosition(caretView).GetDocumentPosition(TextConfiguration.GetCharSize());
}
if (newPos == null) {
return;
}
int column = -1, line = -1;
if (newPos.Column > textViewReader.GetLineLength(newPos.Line)) {
column = textViewReader.GetLineLength(newPos.Line);
}
if (newPos.Line >= textViewReader.LinesCount) {
line = textViewReader.LinesCount - 1;
}
var moveDir = GetMoveDirection(newPos, caretView.CaretPosition);
newPos = new TextPosition(column > -1 ? column : newPos.Column, line > -1 ? line : newPos.Line);
newPos = textViewReader.AdjustStep(newPos, moveDir);
caretView.MoveCursor(newPos);
}
public ChangeInLinesInfo GetChangeInLines(IReadOnlyList<VisualTextLine> lines, TextPosition startingTextPosition, Key key) {
if (key == Key.Delete) {
var isStartEqToTextLen = startingTextPosition.Column == lines[startingTextPosition.Line].Length;
if (isStartEqToTextLen && startingTextPosition.Line == lines.Count) {
return new ChangeInLinesInfo { LinesToChange = new Dictionary<TextPosition, VisualTextLine>(), LinesToRemove = new int[0] };
}
if (isStartEqToTextLen) {
return DeleteNextLine(lines, startingTextPosition);
}
return DeleteFromActiveLine(lines, startingTextPosition);
}
var isStartEqZero = startingTextPosition.Column == 0;
if (isStartEqZero && startingTextPosition.Line == 0) {
return new ChangeInLinesInfo { LinesToChange = new Dictionary<TextPosition, VisualTextLine>(), LinesToRemove = new[] { startingTextPosition.Line } };
}
if (isStartEqZero) {
return RemoveThisLine(lines, startingTextPosition);
}
return RemoveFromActiveLine(lines, startingTextPosition);
}
public TextPosition DeleteFolds(string text, TextPosition position, IDictionary<TextPosition, TextPosition> foldingPositions) {
if (text == GetOpeningTag() || text == GetCollapsibleRepresentation()) {
return position;
}
return text == GetClosingTag() ? DeleteFoldForClosePosition(position, foldingPositions) : null;
}
private IReadOnlyDictionary<int, string> TabPressed(IReadOnlyList<string> lines, string text, TextPosition startingTextPosition) {
var textBeforeCursorPosition = string.Concat(lines[startingTextPosition.Line].Take(startingTextPosition.Column));
var textAfterCursorPosition = string.Concat(lines[startingTextPosition.Line].Skip(startingTextPosition.Column));
return new Dictionary<int, string> {
[startingTextPosition.Line] = textBeforeCursorPosition + new string(' ', TextProperties.Properties.TabSize) + textAfterCursorPosition
};
}
public void Draw(TextPosition position) {
var formattedText = GetFormattedText(Symbol, runProperties);
var textLocation = new Point(position.Column * charSize.Width - charSize.Width / 2, position.Line * charSize.Height);
using (var drawingContext = RenderOpen()) {
drawingContext.DrawText(formattedText, textLocation);
}
}
public void Select(TextPosition position) {
var selection = new VisualElement();
visuals.Clear();
SetSelectionState(position);
selection.Draw(GetSelectionPoints(lastSelectionStart, lastSelectionEnd));
visuals.Add(selection);
}
private IEnumerable<PointsPair> GetSelectionPoints(TextPosition start, TextPosition end) {
visuals.Clear();
if (start.Line <= end.Line) {
return GetSelectionPointsForward(start, end);
}
return GetSelectionPointsInverted(start, end);
}
public TextPosition AdjustStep(TextPosition newPosition, CaretMoveDirection moveDirection) {
var line = ((VisualTextLine)visuals[newPosition.Line]);
var charInfo = line.RenderedText != string.Empty && newPosition.Column < GetLineLength(newPosition.Line) ? line.GetCharInfoAt(newPosition.Column) : null;
if (charInfo != null) {
return charInfo.IsCharacter ? newPosition : GetAdjustedPosition(charInfo, moveDirection);
}
return newPosition;
}
public bool IsInTextRange(TextPosition position) {
if (position.Column < 0 || position.Line < 0) {
return false;
}
if (position.Line >= LinesCount) {
return false;
}
return position.Column <= GetLineLength(position.Line);
}
private void SetSelectionState(TextPosition position) {
if (!isSelecting) {
isSelecting = true;
lastSelectionStart = position;
lastSelectionEnd = lastSelectionStart;
} else {
lastSelectionEnd = position;
}
}
private IDictionary<TextPosition, TextPosition> CreateEmptyFold(TextPosition position, IDictionary<TextPosition, TextPosition> foldingPositions) {
TextPosition outVal;
foldingPositions.TryGetValue(position, out outVal);
var tmpDict = new Dictionary<TextPosition, TextPosition>(foldingPositions);
tmpDict[position] = outVal;
return tmpDict;
}
private ChangeInLinesInfo DeleteFromActiveLine(IReadOnlyList<VisualTextLine> lines, TextPosition startingTextPosition) {
var currentLine = lines[startingTextPosition.Line];
var firstPart = Cut(currentLine, 0, startingTextPosition.Column);
var secondPart = Cut(currentLine, startingTextPosition.Column + 1);
var lineAfterRemove = VisualTextLine.MergeLines(new[] { firstPart, secondPart }, currentLine.Index);
return new ChangeInLinesInfo {
LinesToChange = new Dictionary<TextPosition, VisualTextLine> {
[new TextPosition(startingTextPosition.Column, startingTextPosition.Line)] = lineAfterRemove
},
LinesToRemove = new int[0]
};
}
public SelectionInfo LineSelection(MouseButtonEventArgs mouseEvent) {
var clickPosition = mouseEvent.GetPosition(parent).GetDocumentPosition(TextConfiguration.GetCharSize());
var startPosition = new TextPosition(column: 0, line: clickPosition.Line);
var endPosition = new TextPosition(column: textViewReader.GetLineLength(clickPosition.Line), line: clickPosition.Line);
var cursorColumn = clickPosition.Line + 1 < textViewReader.LinesCount ? 0 : textViewReader.GetLineLength(clickPosition.Line);
var cursorLine = clickPosition.Line + 1 < textViewReader.LinesCount ? clickPosition.Line + 1 : clickPosition.Line;
return new SelectionInfo {
StartPosition = startPosition,
EndPosition = endPosition,
CursorPosition = new TextPosition(column: cursorColumn, line: cursorLine)
};
}
public IReadOnlyDictionary<int, string> GetChangeInLines(IReadOnlyList<string> lines, TextPosition startingTextPosition, string text) {
var replacedText = SpecialCharsRegex.Replace(text, string.Empty);
if (text == TextProperties.Properties.NEWLINE) {
return LineAdded(lines, text, startingTextPosition);
} else if (text == TextProperties.Properties.TAB) {
return TabPressed(lines, text, startingTextPosition);
} else if (replacedText.Length == 1) {
return CharacterEntered(lines, replacedText, startingTextPosition);
} else {
return TextPasted(lines, text, startingTextPosition);
}
}
private ChangeInLinesInfo RemoveFromActiveLine(IReadOnlyList<VisualTextLine> lines, TextPosition startingTextPosition) {
var currentLine = lines[startingTextPosition.Line];
var attachRest = startingTextPosition.Column < lines[startingTextPosition.Line].Length;
var firstPart = Cut(currentLine, 0, startingTextPosition.Column - 1);
var secondPart = attachRest ? Cut(currentLine, startingTextPosition.Column) : null;
var lineAfterRemove = secondPart != null ? VisualTextLine.MergeLines(new[] { firstPart, secondPart }, currentLine.Index) : firstPart;
return new ChangeInLinesInfo {
LinesToChange = new Dictionary<TextPosition, VisualTextLine> {
[new TextPosition(startingTextPosition.Column - 1, startingTextPosition.Line)] = lineAfterRemove
},
LinesToRemove = new int[0]
};
}
private IReadOnlyDictionary<int, string> LineAdded(IReadOnlyList<string> lines, string text, TextPosition startingTextPosition) {
var textBeforeCursorPosition = string.Concat(lines[startingTextPosition.Line].Take(startingTextPosition.Column));
var textAfterCursorPosition = string.Concat(lines[startingTextPosition.Line].Skip(startingTextPosition.Column));
var transformations = new Dictionary<int, string> {
[startingTextPosition.Line] = textBeforeCursorPosition,
[startingTextPosition.Line + 1] = textAfterCursorPosition
};
for (var i = startingTextPosition.Line + 1; i < lines.Count; i++) {
transformations[i + 1] = lines[i];
}
return transformations;
}
private Dictionary<TextPosition, TextPosition> UpdateFolds(Dictionary<TextPosition, TextPosition> newFolds, TextPosition keyToUpdate, TextPosition foldValue) {
var nextPositions = newFolds.Where(kvp => kvp.Key > keyToUpdate).OrderBy(kvp => kvp.Key);
var oldPosition = newFolds[keyToUpdate];
newFolds[keyToUpdate] = foldValue;
foreach (var kvp in nextPositions) {
var tmpPosition = kvp.Value;
newFolds[kvp.Key] = oldPosition;
oldPosition = tmpPosition;
}
return newFolds;
}
private IDictionary<TextPosition, TextPosition> RebuildFolds(TextPosition position, IDictionary<TextPosition, TextPosition> foldingPositions) {
var newFolds = new Dictionary<TextPosition, TextPosition>(foldingPositions);
var candidates = foldingPositions.Where(kvp => position > kvp.Key && (kvp.Value == null || position < kvp.Value));
var closestCandidate = candidates.Max(kvp => kvp.Key);
if (closestCandidate != null) {
if (newFolds[closestCandidate] == null) {
newFolds[closestCandidate] = position;
} else {
newFolds = UpdateFolds(newFolds, closestCandidate, position);
}
}
return newFolds;
}
private IReadOnlyDictionary<int, string> CharacterEntered(IReadOnlyList<string> lines, string text, TextPosition startingTextPosition) {
var currentTextLine = new StringBuilder();
if (lines.Any()) {
if (startingTextPosition.Column >= lines[startingTextPosition.Line].Length) {
currentTextLine.Append(lines[startingTextPosition.Line]).Append(text);
} else {
currentTextLine.Append(lines[startingTextPosition.Line]).Insert(startingTextPosition.Column, text);
}
} else {
currentTextLine.Append(text);
}
return new Dictionary<int, string> {
[startingTextPosition.Line] = currentTextLine.ToString()
};
}
public IEnumerable<string> GetTextPartsBetweenPositions(TextPosition startPosition, TextPosition endPosition) {
var parts = visuals.ToEnumerableOf<VisualTextLine>().SelectMany(line => line.GetStringContents()).ToList();
if (parts.Count == 0) {
return parts;
}
if (startPosition.Line == endPosition.Line) {
parts[0] = string.Join("", parts[0].Skip(startPosition.Column).Take(endPosition.Column - startPosition.Column));
} else {
parts[0] = parts[0].Substring(startPosition.Column);
}
var lastIndex = parts.Count - 1;
var substringTo = endPosition.Column;
if (startPosition.Line == endPosition.Line) {
substringTo = endPosition.Column - startPosition.Column;
}
parts[lastIndex] = string.Join("", parts[lastIndex].Take(substringTo));
return parts;
}
private ChangeInLinesInfo RemoveThisLine(IReadOnlyList<VisualTextLine> lines, TextPosition startingTextPosition) {
var firstLine = lines[startingTextPosition.Line - 1];
var linesAffected = new List<KeyValuePair<TextPosition, VisualTextLine>> {
new KeyValuePair<TextPosition, VisualTextLine>(
new TextPosition(lines[startingTextPosition.Line - 1].Length, startingTextPosition.Line - 1),
VisualTextLine.MergeLines(new[] { firstLine, lines[startingTextPosition.Line] }, firstLine.Index))
};
for (var i = startingTextPosition.Line + 1; i < lines.Count; i++) {
linesAffected.Add(new KeyValuePair<TextPosition, VisualTextLine>(new TextPosition(0, i - 1), lines[i].CloneWithIndexChange(i - 1)));
}
return new ChangeInLinesInfo {
LinesToChange = linesAffected,
LinesToRemove = new[] { lines.Count - 1 }
};
}
public void HandleTextRemove(TextPosition newPosition) => MoveCaret(newPosition);
public char GetCharAt(TextPosition position) {
var info = ((VisualTextLine)visuals[position.Line]).GetCharInfoAt(position.Column);
return info.IsCharacter ? info.Text[0] : default(char);
}
public void MoveCursor(TextPosition newPos) => MoveCaret(newPos);
private TextPosition DeleteFoldForClosePosition(TextPosition position, IDictionary<TextPosition, TextPosition> foldingPositions) {
var pair = foldingPositions.Where(kvp => kvp.Value == position).FirstOrDefault();
return pair.Key;
}
private ChangeInLinesInfo DeleteNextLine(IReadOnlyList<VisualTextLine> lines, TextPosition startingTextPosition) {
var firstLine = lines[startingTextPosition.Line];
var secondLine = startingTextPosition.Line + 1 < lines.Count ? lines[startingTextPosition.Line + 1] : null;
var linesToMerge = secondLine == null ? new[] { firstLine } : new[] { firstLine, secondLine };
var linesAffected = new List<KeyValuePair<TextPosition, VisualTextLine>> {
new KeyValuePair<TextPosition, VisualTextLine>(
new TextPosition(startingTextPosition.Column, startingTextPosition.Line),
VisualTextLine.MergeLines(linesToMerge, firstLine.Index))
};
for (var i = startingTextPosition.Line + 2; i < lines.Count; i++) {
linesAffected.Add(new KeyValuePair<TextPosition, VisualTextLine>(new TextPosition(0, i - 1), lines[i].CloneWithIndexChange(i - 1)));
}
return new ChangeInLinesInfo {
LinesToChange = linesAffected,
LinesToRemove = new[] { lines.Count - 1 }
};
}