int GetOffsetFromMousePosition(Point positionRelativeToTextView, out int visualColumn)
{
visualColumn = 0;
TextView textView = textArea.TextView;
Point pos = positionRelativeToTextView;
if (pos.Y < 0)
{
pos.Y = 0;
}
if (pos.Y > textView.ActualHeight)
{
pos.Y = textView.ActualHeight;
}
pos += textView.ScrollOffset;
if (pos.Y > textView.DocumentHeight)
{
pos.Y = textView.DocumentHeight - ExtensionMethods.Epsilon;
}
VisualLine line = textView.GetVisualLineFromVisualTop(pos.Y);
if (line != null)
{
visualColumn = line.GetVisualColumn(pos);
return(line.GetRelativeOffset(visualColumn) + line.FirstDocumentLine.Offset);
}
return(-1);
}
/// <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);
}
}
/// <summary>
/// Changes a part of the current document line.
/// </summary>
/// <param name="startOffset">Start offset of the region to change</param>
/// <param name="endOffset">End offset of the region to change</param>
/// <param name="action">Action that changes an individual <see cref="VisualLineElement"/>.</param>
protected void ChangeLinePart(int startOffset, int endOffset, Action <VisualLineElement> action)
{
if (startOffset < currentDocumentLineStartOffset || startOffset > currentDocumentLineEndOffset)
{
throw new ArgumentOutOfRangeException("startOffset", startOffset, "Value must be between " + currentDocumentLineStartOffset + " and " + currentDocumentLineEndOffset);
}
if (endOffset < startOffset || endOffset > currentDocumentLineEndOffset)
{
throw new ArgumentOutOfRangeException("endOffset", endOffset, "Value must be between " + startOffset + " and " + currentDocumentLineEndOffset);
}
VisualLine vl = this.CurrentContext.VisualLine;
int visualStart = vl.GetVisualColumn(startOffset - firstLineStart);
int visualEnd = vl.GetVisualColumn(endOffset - firstLineStart);
if (visualStart < visualEnd)
{
ChangeVisualElements(visualStart, visualEnd, action);
}
}
int GetTextLineIndexFromOffset(List <TextLine> textLines, int offset)
{
int lineNumber = TextView.Document.GetLineByOffset(offset).LineNumber;
VisualLine vl = TextView.GetVisualLine(lineNumber);
if (vl != null)
{
int relOffset = offset - vl.FirstDocumentLine.Offset;
TextLine line = vl.GetTextLine(vl.GetVisualColumn(relOffset));
return(textLines.IndexOf(line));
}
return(-1);
}
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);
}
}