public VisualTextLine CollapseTextRange(TextRange area, IReadOnlyList<string> lines, ICollapseRepresentation collapseRepresentationAlgorithm) {
var precedingText = new string(lines[area.StartPosition.Line].Take(area.StartPosition.Column).ToArray());
var followingText = new string(lines[area.EndPosition.Line].Skip(area.EndPosition.Column + 1).ToArray());
var collapsedLineIndex = area.StartPosition.Line;
var middlePart = new List<string>();
var start = area.StartPosition.Line;
var end = area.EndPosition.Line;
if (start != end) {
for (var i = start; i <= end; i++) {
var currentLine = lines[i];
if (i == start) {
currentLine = string.Join("", currentLine.Skip(area.StartPosition.Column));
} else if (i == end) {
currentLine = string.Join("", currentLine.Take(area.EndPosition.Column + 1));
}
middlePart.Add(currentLine);
}
} else {
middlePart.Add(string.Join("", lines[start].Skip(area.StartPosition.Column).Take((1 + area.EndPosition.Column) - area.StartPosition.Column)));
}
return VisualTextLine.Create(middlePart, precedingText, followingText, collapsedLineIndex, collapseRepresentationAlgorithm.GetCollapseRepresentation());
}
public ChangeInLinesInfo GetChangeInLines(IReadOnlyList<VisualTextLine> lines, TextRange range) {
var orderedRanges = (new[] { range.StartPosition, range.EndPosition }).OrderBy(elem => elem.Line).ThenBy(elem => elem.Column).ToArray();
var pair = new TextRange {
StartPosition = orderedRanges[0],
EndPosition = orderedRanges[1]
};
var rangeEnd = -1;
if (pair.StartPosition.Line == pair.EndPosition.Line) {
rangeEnd = pair.EndPosition.Line;
} else {
rangeEnd = pair.EndPosition.Line + 1;
}
var firstPart = Cut(lines[pair.StartPosition.Line], 0, pair.StartPosition.Column);
var secondPart = Cut(lines[pair.EndPosition.Line], pair.EndPosition.Column);
return new ChangeInLinesInfo {
LinesToChange = new Dictionary<TextPosition, VisualTextLine> {
[new TextPosition(pair.StartPosition.Column, pair.StartPosition.Line)] =
VisualTextLine.MergeLines(new[] { firstPart, secondPart }, firstPart.Index)
},
LinesToRemove = Enumerable.Range(pair.StartPosition.Line, rangeEnd).ToList()
};
}
public IEnumerable<VisualTextLine> GetLinesToRedrawAfterCollapse(IReadOnlyList<VisualTextLine> visuals, VisualTextLine collapsedLine, TextRange range) {
var linesToRedraw = new List<VisualTextLine>();
if (range.StartPosition.Line == range.EndPosition.Line) {
return linesToRedraw;
}
var collapseEndLine = range.EndPosition.Line;
for (int i = collapseEndLine + 1, newIndex = collapsedLine.Index + 1; i < visuals.Count; i++, newIndex++) {
var line = visuals[i].CloneWithIndexChange(newIndex);
linesToRedraw.Add(line);
}
return linesToRedraw;
}
private bool IsFoldMultiline(TextRange range) =>
range.StartPosition.Line != range.EndPosition.Line;
private bool IsCaretInbetweenTags(TextRange range) =>
CaretPosition >= range.StartPosition && CaretPosition <= range.EndPosition;
private void SendMessage(FoldingStates state, FoldingPositionInfo folding) {
var areaBeforeFolding = new TextRange();
var areaAfterFolding = new TextRange();
if (state == FoldingStates.FOLDED) {
areaBeforeFolding.StartPosition = folding.Position;
areaBeforeFolding.EndPosition = foldingPositions.First(pair => Equals(pair.Key, folding)).Value.Position;
areaAfterFolding.StartPosition = folding.Position;
areaAfterFolding.EndPosition = new TextPosition(column: folding.Position.Column + FoldingAlgorithm.GetCollapsibleRepresentation().Length, line: folding.Position.Line);
} else {
areaAfterFolding.StartPosition = folding.Position;
areaAfterFolding.EndPosition = foldingPositions.First(pair => Equals(pair.Key, folding)).Value.Position;
areaBeforeFolding.StartPosition = folding.Position;
areaBeforeFolding.EndPosition = new TextPosition(column: folding.Position.Column + FoldingAlgorithm.GetCollapsibleRepresentation().Length, line: folding.Position.Line);
}
Postbox.Put(new FoldClickedMessage {
AreaBeforeFolding = areaBeforeFolding,
AreaAfterFolding = areaAfterFolding,
ClosingTag = FoldingAlgorithm.GetClosingTag(),
OpeningTag = FoldingAlgorithm.GetOpeningTag(),
State = state
});
}
public void RemoveText(TextRange range) {
var removalInfo = removingAlgorithm.GetChangeInLines(GetVisualLines(), range);
if (removalInfo.LinesToChange.Any()) {
DeleteText(removalInfo);
UpdateSize();
}
}
public void ReplaceText(string enteredText, TextRange range) {
RemoveText(range);
InputText(enteredText);
UpdateSize();
}
public IEnumerable<VisualTextLine> ExpandTextRange(TextRange area, IEnumerable<string> lines) =>
lines.Skip(area.StartPosition.Line).Take(1 + area.EndPosition.Line - area.StartPosition.Line).Select((line, index) => VisualTextLine.Create(line, area.StartPosition.Line + index));