LayoutCollector Constructor

public LayoutCollector(
	Document doc
)

Public Sub New ( 
	doc As Document
)

public:
LayoutCollector(
	Document^ doc
)

new : 
        doc : Document -> LayoutCollector

// Open a blank document and create a DocumentBuilder
Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// Create a LayoutCollector object for our document that will have information about the nodes we placed
LayoutCollector layoutCollector = new LayoutCollector(doc);

// The document itself is a node that contains everything, which currently spans 0 pages
Assert.AreEqual(doc, layoutCollector.Document);
Assert.AreEqual(0, layoutCollector.GetNumPagesSpanned(doc));

// Populate the document with sections and page breaks
builder.Write("Section 1");
builder.InsertBreak(BreakType.PageBreak);
builder.InsertBreak(BreakType.PageBreak);
doc.AppendChild(new Section(doc));
doc.LastSection.AppendChild(new Body(doc));
builder.MoveToDocumentEnd();
builder.Write("Section 2");
builder.InsertBreak(BreakType.PageBreak);
builder.InsertBreak(BreakType.PageBreak);

// The collected layout data won't automatically keep up with the real document contents
Assert.AreEqual(0, layoutCollector.GetNumPagesSpanned(doc));

// After we clear the layout collection and update it, the layout entity collection will be populated with up-to-date information about our nodes
// The page span for the document now shows 5, which is what we would expect after placing 4 page breaks
layoutCollector.Clear();
doc.UpdatePageLayout();
Assert.AreEqual(5, layoutCollector.GetNumPagesSpanned(doc));

// We can also see the start/end pages of any other node, and their overall page spans
NodeCollection nodes = doc.GetChildNodes(NodeType.Any, true);
foreach (Node node in nodes)
{
    Console.WriteLine($"->  NodeType.{node.NodeType}: ");
    Console.WriteLine(
        $"\tStarts on page {layoutCollector.GetStartPageIndex(node)}, ends on page {layoutCollector.GetEndPageIndex(node)}," +
        $" spanning {layoutCollector.GetNumPagesSpanned(node)} pages.");
}

// We can iterate over the layout entities using a LayoutEnumerator
LayoutEnumerator layoutEnumerator = new LayoutEnumerator(doc);
Assert.AreEqual(LayoutEntityType.Page, layoutEnumerator.Type);

// The LayoutEnumerator can traverse the collection of layout entities like a tree
// We can also point it to any node's corresponding layout entity like this
layoutEnumerator.Current = layoutCollector.GetEntity(doc.GetChild(NodeType.Paragraph, 1, true));
Assert.AreEqual(LayoutEntityType.Span, layoutEnumerator.Type);
Assert.AreEqual("¶", layoutEnumerator.Text);