protected override Size ArrangeOverride(Size finalSize)
{
if (TextDocument != null)
{
GenerateTextProperties();
Viewport = new Size(finalSize.Width, finalSize.Height / CharSize.Height);
Extent = new Size(finalSize.Width, LogicalScrollSize);
InvalidateScroll.Invoke();
}
var result = finalSize;
var arrangeOffset = new Vector(Math.Floor(Offset.X) * CharSize.Width, Math.Floor(Offset.Y) * CharSize.Height);
result = base.ArrangeOverride(new Size(result.Width, result.Height + arrangeOffset.Y));
var child = contentPresenter as ILayoutable;
if (child != null)
{
child.Arrange(new Rect((Point)(-arrangeOffset), child.DesiredSize));
}
return(result);
}
protected override Size ArrangeOverride(Size finalSize)
{
_viewport = new Size(finalSize.Width, finalSize.Height / _lineSize.Height);
_extent = new Size(_lineSize.Width, itemCount + 1);
InvalidateScroll?.Invoke();
return(finalSize);
}
private void GenerateVisualLines(DrawingContext context)
{
VisualLines.Clear();
uint visualLineNumber = 0;
for (var i = (int)offset.Y; i < Viewport.Height + offset.Y && i < TextDocument.LineCount && i >= 0; i++)
{
var line = new VisualLine {
DocumentLine = TextDocument.Lines[i], VisualLineNumber = visualLineNumber++
};
GenerateText(line);
VisualLines.Add(line);
}
if (TextDocument.LineCount != lastLineCount)
{
lastLineCount = TextDocument.LineCount;
InvalidateMeasure();
InvalidateScroll?.Invoke();
}
invalidateVisualLines = false;
}