public void moveCaretToNewLine(int lineDelta) {
ArrayList<TypedLayout> lines = getLines();
int newLineNumber = caretLocation.line + lineDelta;
if (newLineNumber >= 0 && newLineNumber < lines.size()) {
TextLocation origin = verticalOrigin != null ? verticalOrigin : caretLocation;
int desiredX = lines.get(origin.line).getX(origin.index);
TypedLayout newLine = lines.get(newLineNumber);
int newIndex = newLine.getIndexAt(desiredX);
TextLocation newLocation = TextLocation.at(newLineNumber, newIndex);
setCaretLocation(newLocation);
verticalOrigin = origin;
}
}
