//
// public methods
//
#region public PDFLayoutPage BeginNewContinuationPage()
/// <summary>
/// Begins a new page based on the current page's size and content rect. This will then be the current page
/// </summary>
/// <returns></returns>
public PDFLayoutPage BeginNewContinuationPage()
{
if (CurrentPageIndex < 0)
{
throw new ArgumentOutOfRangeException("Cannot begin a new page based on previous page if there are no previous pages");
}
PDFLayoutPage pg = this.CurrentPage;
PDFTraceLog log = this.DocumentComponent.TraceLog;
if (log.ShouldLog(TraceLevel.Verbose))
{
log.Add(TraceLevel.Verbose, "LAYOUT", "Beginning a new continuation page for '" + pg + "'");
}
if (!pg.IsClosed)
{
pg.Close();
}
PDFSize size = pg.Size;
Style style = pg.FullStyle;
Page owner = pg.Owner as Page;
OverflowAction overflow = pg.OverflowAction;
PDFLayoutPage newpg = this.BeginNewPage(owner, this.Engine, style, overflow);
return(newpg);
}
//
// overrides
//
/// <summary>
/// Main overridden method
/// </summary>
protected override void DoLayoutComponent()
{
IDisposable record = this.Context.PerformanceMonitor.Record(PerformanceMonitorType.Layout_Pages, "Page " + this.Component.ID);
//Take a copy of the style stack for the header and footer
this.PageStyleStack = this.Context.StyleStack.Clone();
//Get the page size and position options
PageSize pgsize = this.FullStyle.CreatePageSize();
pgsize.Size = this.GetNextPageSize(this.Component, this.FullStyle, pgsize.Size);
PDFPositionOptions options = this.FullStyle.CreatePostionOptions();
//Graphics
PDFGraphics g = this.Page.CreateGraphics(this.StyleStack, this.Context);
this.Context.Graphics = g;
//Size, border, margins
PDFRect bounds = new PDFRect(PDFPoint.Empty, pgsize.Size);
PDFRect contentrect = GetContentRectFromBounds(bounds, options.Margins, options.Padding);
//Columns
PDFColumnOptions colOpts = this.FullStyle.CreateColumnOptions();
//Overflow
OverflowAction action = options.OverflowAction;
PDFLayoutPage pg = BuildNewPage(pgsize.Size, options, colOpts, action);
//Register page numbering
PDFPageNumberOptions numbers = this.GetPageNumbering(this.FullStyle);
this.RegisterPageNumbering(pg, numbers);
this.LayoutPageContent();
//close the last page
PDFLayoutPage last = this.DocumentLayout.CurrentPage;
if (last.IsClosed == false)
{
last.Close();
}
//Unregister the page numbers.
this.UnRegisterPageNumbering(last, numbers);
//release graphics
this.Context.Graphics = null;
g.Dispose();
record.Dispose();
}
/// <summary>
/// Checks the overflow style and if new pages are supported closes the current page layout and
/// creates a new page layout (becomming the current page) and returns true.
/// If overflow is not supported - returns false
/// </summary>
/// <param name="region">If there is a change in current page, this is set to the new region</param>
/// <param name="block">If there is a change in current page, this is set to the new block</param>
/// <returns></returns>
public override bool MoveToNextPage(IPDFComponent initiator, Style initiatorStyle, Stack <PDFLayoutBlock> depth, ref PDFLayoutRegion region, ref PDFLayoutBlock block)
{
StyleValue <OverflowAction> action;
if (this.FullStyle.TryGetValue(StyleKeys.OverflowActionKey, out action) && action.Value == OverflowAction.NewPage)
{
PDFLayoutPage lastpage = this.DocumentLayout.CurrentPage;
PDFLayoutBlock open = lastpage.ContentBlock;
if (open.IsClosed)
{
open = null;
}
else
{
open = open.LastOpenBlock();
}
List <PDFLayoutBlock> toclose = new List <PDFLayoutBlock>(depth);
for (int i = toclose.Count - 1; i >= 0; i--)
{
open = toclose[i];
if (open.CurrentRegion != null && open.CurrentRegion.IsClosed == false)
{
PDFLayoutRegion openRegion = open.CurrentRegion;
openRegion.Close();
}
PDFLayoutBlock parent = open.Parent as PDFLayoutBlock;
if (null != parent)
{
PDFLayoutRegion parentRegion = parent.CurrentRegion;
if (null != parentRegion)
{
open.Close();
parentRegion.AddToSize(open);
}
}
//open = parent;
}
lastpage.Close();
var pgSize = this.GetNextPageSize(initiator, initiatorStyle, lastpage.Size);
PDFLayoutPage page = BuildContinuationPage(lastpage, pgSize);
block = page.CurrentBlock;
region = block.CurrentRegion;
if (this.Context.ShouldLogVerbose)
{
this.Context.TraceLog.Add(TraceLevel.Verbose, LOG_CATEGORY, "Built a new continuation page for " + this.Component + " and recreated the " + toclose.Count + " blocks and regions on the new page");
}
return(true);
}
else
{
if (this.Context.ShouldLogVerbose)
{
this.Context.TraceLog.Add(TraceLevel.Verbose, LOG_CATEGORY, "Cannot overflow content for page " + this.Component + " halting the continued layout by returning false");
}
return(false); //Cannot overflow
}
}