/// <summary>
/// Validates the visual column of the caret using the specified visual line.
/// The visual line must contain the caret offset.
/// </summary>
void RevalidateVisualColumn(VisualLine visualLine)
{
if (visualLine == null)
{
throw new ArgumentNullException("visualLine");
}
// mark column as validated
visualColumnValid = true;
int caretOffset = textView.Document.GetOffset(position);
int firstDocumentLineOffset = visualLine.FirstDocumentLine.Offset;
if (position.VisualColumn < 0)
{
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstDocumentLineOffset);
}
else
{
int offsetFromVisualColumn = visualLine.GetRelativeOffset(position.VisualColumn);
offsetFromVisualColumn += firstDocumentLineOffset;
if (offsetFromVisualColumn != caretOffset)
{
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstDocumentLineOffset);
}
else
{
if (position.VisualColumn > visualLine.VisualLength)
{
position.VisualColumn = visualLine.VisualLength;
}
}
}
// search possible caret position (first try forwards)
int newVisualColumn = visualLine.GetNextCaretPosition(position.VisualColumn - 1, LogicalDirection.Forward, CaretPositioningMode.Normal);
if (newVisualColumn < 0)
{
// then try backwards
newVisualColumn = visualLine.GetNextCaretPosition(position.VisualColumn + 1, LogicalDirection.Backward, CaretPositioningMode.Normal);
}
if (newVisualColumn >= 0 && newVisualColumn != position.VisualColumn)
{
int newOffset = visualLine.GetRelativeOffset(newVisualColumn) + firstDocumentLineOffset;
this.Position = new TextViewPosition(textView.Document.GetLocation(newOffset), newVisualColumn);
}
}
SimpleSegment GetWordAtMousePosition(MouseEventArgs e)
{
TextView textView = textArea.TextView;
if (textView == null)
{
return(SimpleSegment.Invalid);
}
Point pos = e.GetPosition(textView);
if (pos.Y < 0)
{
pos.Y = 0;
}
if (pos.Y > textView.ActualHeight)
{
pos.Y = textView.ActualHeight;
}
pos += textView.ScrollOffset;
VisualLine line = textView.GetVisualLineFromVisualTop(pos.Y);
if (line != null)
{
int visualColumn = line.GetVisualColumn(pos);
int wordStartVC = line.GetNextCaretPosition(visualColumn + 1, LogicalDirection.Backward, CaretPositioningMode.WordStartOrSymbol);
if (wordStartVC == -1)
{
wordStartVC = 0;
}
int wordEndVC = line.GetNextCaretPosition(wordStartVC, LogicalDirection.Forward, CaretPositioningMode.WordBorderOrSymbol);
if (wordEndVC == -1)
{
wordEndVC = line.VisualLength;
}
int relOffset = line.FirstDocumentLine.Offset;
int wordStartOffset = line.GetRelativeOffset(wordStartVC) + relOffset;
int wordEndOffset = line.GetRelativeOffset(wordEndVC) + relOffset;
return(new SimpleSegment(wordStartOffset, wordEndOffset - wordStartOffset));
}
else
{
return(SimpleSegment.Invalid);
}
}
static void MoveCaretLeft(TextArea textArea, TextViewPosition caretPosition, VisualLine visualLine, CaretPositioningMode mode)
{
int pos = visualLine.GetNextCaretPosition(caretPosition.VisualColumn, LogicalDirection.Backward, mode);
if (pos >= 0)
{
SetCaretPosition(textArea, pos, visualLine.GetRelativeOffset(pos) + visualLine.FirstDocumentLine.Offset);
}
else if (caretPosition.Line > 1)
{
DocumentLine prevLine = textArea.Document.GetLineByNumber(caretPosition.Line - 1);
SetCaretPosition(textArea, -1, prevLine.Offset + prevLine.Length);
}
}
static void MoveCaretRight(TextArea textArea, TextViewPosition caretPosition, VisualLine visualLine, CaretPositioningMode mode)
{
int pos = visualLine.GetNextCaretPosition(caretPosition.VisualColumn, LogicalDirection.Forward, mode);
if (pos >= 0)
{
SetCaretPosition(textArea, pos, visualLine.GetRelativeOffset(pos) + visualLine.FirstDocumentLine.Offset);
}
else
{
// move to start of next line
SetCaretPosition(textArea, 0, visualLine.LastDocumentLine.Offset + visualLine.LastDocumentLine.TotalLength);
}
}
static void MoveCaretToStartOfLine(TextArea textArea, VisualLine visualLine)
{
int newVC = visualLine.GetNextCaretPosition(-1, LogicalDirection.Forward, CaretPositioningMode.WordStart);
// in empty lines (whitespace only), jump to the end
if (newVC < 0)
{
newVC = visualLine.VisualLength;
}
// when the caret is already at the start of the text, jump to start before whitespace
if (newVC == textArea.Caret.VisualColumn)
{
newVC = 0;
}
int offset = visualLine.FirstDocumentLine.Offset + visualLine.GetRelativeOffset(newVC);
SetCaretPosition(textArea, newVC, offset);
}
