internal static TextLineImpl Create(TextParagraphProperties paragraphProperties, int firstIndex, int paragraphLength, TextSource textSource)
{
var index = firstIndex;
var visibleLength = 0;
var widthLeft = paragraphProperties.TextWrapping == TextWrapping.Wrap && paragraphLength > 0 ? paragraphLength : double.MaxValue;
TextLineRun prevRun = null;
var run = TextLineRun.Create(textSource, index, firstIndex, widthLeft, paragraphProperties);
if (!run.IsEnd && run.Width <= widthLeft)
{
index += run.Length;
widthLeft -= run.Width;
prevRun = run;
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft, paragraphProperties);
}
var trailing = new TrailingInfo();
var runs = new List <TextLineRun>(2);
if (prevRun != null)
{
visibleLength += AddRunReturnVisibleLength(runs, prevRun);
}
while (true)
{
visibleLength += AddRunReturnVisibleLength(runs, run);
index += run.Length;
widthLeft -= run.Width;
if (run.IsEnd || widthLeft <= 0)
{
trailing.SpaceWidth = 0;
UpdateTrailingInfo(runs, trailing);
return(new TextLineImpl(paragraphProperties, firstIndex, runs, trailing));
}
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft, paragraphProperties);
if (run.Width > widthLeft)
{
return(new TextLineImpl(paragraphProperties, firstIndex, runs, trailing));
}
}
}