public VisualLineTextSource(VisualLine visualLine)
{
}
public void ValidateVisualColumn(VisualLine visualLine)
{
if (visualLine == null) {
throw new ArgumentNullException("visualLine");
}
int caretOffset = textView.Document.GetOffset(position);
int firstOffset = visualLine.FirstDocumentLine.Offset;
if (position.VisualColumn < 0) {
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstOffset);
} else {
int relativeOffset = visualLine.GetRelativeOffset(position.VisualColumn);
relativeOffset += firstOffset;
if (relativeOffset != caretOffset) {
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstOffset);
} else {
if (position.VisualColumn > visualLine.VisualLength) {
position.VisualColumn = visualLine.VisualLength;
}
}
}
int newVisualColumn = visualLine.GetNextCaretPosition(position.VisualColumn - 1, false, CaretPositioningMode.Normal);
if (newVisualColumn < 0) {
newVisualColumn = visualLine.GetNextCaretPosition(position.VisualColumn + 1, true, CaretPositioningMode.Normal);
}
if (newVisualColumn >= 0 && newVisualColumn != position.VisualColumn) {
int newOffset = visualLine.GetRelativeOffset(newVisualColumn) + firstOffset;
Position = new TextViewPosition(textView.Document.GetLocation(newOffset), newVisualColumn);
}
}
Rect CalcCaretRectangle(VisualLine visualLine)
{
ValidateVisualColumn(visualLine);
TextLine textLine = visualLine.GetTextLine(position.VisualColumn);
double xPos = textLine.GetDistanceFromCharacterHit(new CharacterHit(position.VisualColumn, 0));
double top = visualLine.GetTextLineVisualTop(textLine);
double bottom = top + textLine.Height;
double fontSize = (double)textArea.GetValue(TextBlock.FontSizeProperty);
return new Rect(xPos, bottom - fontSize, SystemParameters.CaretWidth, fontSize);
}
public VisualLineText(VisualLine parentVisualLine, int length) : base(length, length)
{
}
public void Redraw(VisualLine line, DispatcherPriority priority)
{
//TODO: TextView.Redraw()
throw new NotImplementedException();
}
VisualLine BuildVisualLine(DocumentLine documentLine, TextRunProperties textRunProperties,
TextParagraphProperties paragraphProperties, VisualLineElementGenerator[] generators,
IVisualLineTransformer[] transformers, Size availableSize)
{
if (heightTree.GetIsCollapsed(documentLine)) {
throw new InvalidOperationException();
}
var visualLine = new VisualLine(documentLine);
var textSource = new VisualLineTextSource(visualLine) {
Document = this.Document,
GlobalTextRunProperties = textRunProperties,
TextView = this
};
visualLine.ConstructVisualElements(textSource, generators);
visualLine.RunTransformers(textSource, transformers);
int offset = 0;
TextLineBreak lineBreak = null;
var textLines = new List<TextLine>();
while (offset <= visualLine.VisualLength) {
TextLine tl = textFormatter.FormatLine(textSource, offset,
availableSize.Width, paragraphProperties, lineBreak);
textLines.Add(tl);
offset += tl.Length;
lineBreak = tl.GetTextLineBreak();
}
visualLine.SetTextLines(textLines);
heightTree.SetHeight(visualLine.FirstDocumentLine, visualLine.Height);
return visualLine;
}
