public void Arrange(Document document)
{
var pageSize = document.Variable(PageVariables.Size);
var margin = document.Variable(PageVariables.Margin);
var boxSize = pageSize;
boxSize.Height -= margin.Height;
boxSize.Width -= margin.Width;
var startOffset = new Position(margin.Left, margin.Top);
var extraStartOffset = new Position(margin.Left, pageSize.Height - margin.Bottom);
var contentArea = new Rectangle(startOffset, boxSize);
MeasuredDocumentPage?curPage = null;
double curHeight = boxSize.Height;
var flexList = new LinkedList <Measurement>();
var measurements = new List <Measurement>(document.Measurements);
// Stage one:
// Add measurements to pages
for (int i = 0; i < measurements.Count; i++)
{
var measurement = measurements[i];
if (measurement.Element is PdfElement pdfElement)
{
document.Pages.Add(new PdfDocumentPage(document, pdfElement));
// reseting the page so that following measurements start on a new page.
curPage = null;
}
else
{
if (curPage == null)
{
curPage = AddPage(document, pageSize, contentArea);
curHeight = boxSize.Height;
}
FitFlex(curPage, flexList, ref curHeight);
if (TryFitMeasurement(curPage, measurement, flexList, false, ref curHeight) == FitResult.AddPage)
{
var split = measurement.Element.Split(measurement, curHeight);
if (split.IsSplit)
{
curPage.Measurements.Add(split.Measurement);
if (split.Measurement.Element.Page == null)
{
split.Measurement.Element.Page = curPage;
}
measurements[i] = split.Measurement;
if (split.Next != null)
{
measurements.Insert(i + 1, split.Next);
}
}
else if (curHeight == boxSize.Height)
{
curPage.Measurements.Add(split.Source);
if (split.Source.Element.Page == null)
{
split.Source.Element.Page = curPage;
}
}
curHeight = boxSize.Height;
curPage = AddPage(document, pageSize, contentArea);
}
}
}
if (curPage != null)
{
// Add leftover flexible items (part of stage one)
foreach (var m in flexList)
{
m.Flexible = false;
if (TryFitMeasurement(curPage, m, flexList, false, ref curHeight) == FitResult.AddPage)
{
curHeight = boxSize.Height;
curPage = AddPage(document, pageSize, contentArea);
TryFitMeasurement(curPage, m, flexList, false, ref curHeight);
}
}
}
flexList.Clear();
// Stage two:
// Layout measurements on each page
foreach (var page in document.Pages.OfType <MeasuredDocumentPage>())
{
var extras = new List <Measurement>();
var currentOffset = startOffset;
var extraHeight = 0.0;
foreach (var measurement in page.Measurements)
{
var accumulated = measurement.AccumulatedExtra;
extras.AddRange(accumulated.Subs);
extraHeight += accumulated.TotalSize.Height;
}
foreach (var measurement in page.Measurements)
{
var size = measurement.TotalSize;
measurement.Position = currentOffset;
Realign(measurement, boxSize, pageSize, measurement.Element.Style.Get(StyleKeys.HorizontalAlignment));
measurement.Element.Arrange(measurement);
currentOffset.Y += size.Height;
}
var extraOffset = new Position(extraStartOffset.X, extraStartOffset.Y - extraHeight);
// Add footnote bar
if (extras.Count > 0)
{
var line = new Line(Position.Zero, new Position(boxSize.Width / 2.5, 0));
var path = new PathElement(line)
{
Document = document,
Page = page,
Stroke = Colors.Black,
Fill = Colors.Black
};
var pathMeasurement = path.Measure(boxSize);
pathMeasurement.Position = extraOffset;
path.Arrange(pathMeasurement);
page.Measurements.Add(pathMeasurement);
}
foreach (var extra in extras)
{
var size = extra.TotalSize;
extra.Position = extraOffset;
Realign(extra, boxSize, pageSize, extra.Element.Style.Get(StyleKeys.HorizontalAlignment));
extra.Element.Arrange(extra);
extraOffset.Y += size.Height;
}
// Set number at the end of the page layouting
// so that any number changing elements can take effect
page.Number = document.PageNumbering.Next();
page.AddPageItems();
}
}