//
// overflow methods
//
#region protected virtual bool StartListInAnotherRegion(PDFUnit itemHeight, PDFLayoutBlock item, int itemindex)
/// <summary>
/// Closes down the current list and attempts to open a new region to start laying out any further items.
/// Returns true if a new region was created, otherwise false.
/// </summary>
/// <param name="itemHeight"></param>
/// <param name="item"></param>
/// <param name="itemindex"></param>
/// <returns></returns>
protected virtual bool StartListInAnotherRegion(PDFUnit itemHeight, PDFLayoutBlock item, int itemindex)
{
PDFLayoutRegion itemRegion = item.CurrentRegion;
PDFLayoutBlock origListBlock = item.Parent as PDFLayoutBlock;
PDFLayoutRegion origListRegion = origListBlock.CurrentRegion;
if (origListBlock.IsClosed == false)
{
origListBlock.Close();
}
//(origListBlock.Parent as PDFLayoutBlock).CurrentRegion.AddToSize(origListBlock);
bool newPage;
bool started = this.MoveToNextRegion(itemHeight, ref itemRegion, ref item, out newPage);
if (started)
{
if (this.Context.ShouldLogVerbose)
{
this.Context.TraceLog.Add(TraceLevel.Verbose, ListEngineLogCategory, "Started list '" + this.List.ID + "' in a new " + (newPage ? "Page" : "Region") + " and list item block is now '" + item.ToString() + "'");
}
}
return(started);
}
/// <summary>
/// Moves the entire list block to a new region or page in the layout
/// </summary>
/// <param name="requiredHeight"></param>
/// <returns></returns>
protected virtual bool MoveFullListToNextRegion(PDFUnit requiredHeight)
{
if (_didmovefulllist)
{
this.Context.TraceLog.Add(TraceLevel.Error, ListEngineLogCategory, "Already moved list to the next region so cannot move list '" + this.List.ID + "' to the next region");
return(false);
}
PDFLayoutBlock block = this._listBlock;
PDFLayoutRegion region = this._listBlock.CurrentRegion;
bool newPage;
if (this.MoveToNextRegion(requiredHeight, ref region, ref block, out newPage))
{
if (this.Context.ShouldLogVerbose)
{
this.Context.TraceLog.Add(TraceLevel.Verbose, ListEngineLogCategory, "Moved entire list '" + this.List.ID + "' to the next " + (newPage ? "Page" : "Region") + " and list block is now '" + block.ToString() + "'");
}
//If we have a new block then we set the old one as invisible
if (block != _listBlock)
{
_listBlock.Position.Visibility = Visibility.None;
}
_listBlock = block;
_didmovefulllist = true;
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// If there is no open line at the start, or after a hard return, then this created a new one (adding inset as required)
/// </summary>
/// <returns></returns>
private PDFLayoutLine EnsureFirstLineAvailable(out bool startedLine)
{
startedLine = false;
PDFLayoutPage pg = this.Context.DocumentLayout.CurrentPage;
PDFLayoutBlock block = pg.LastOpenBlock();
if (null == block || block.IsClosed)
{
this.Context.TraceLog.Add(TraceLevel.Error, LOG_CATEGORY, "There is no open block on page '" + pg.ToString() + "' to add content to.");
return(null);
throw new InvalidOperationException("There is no open block to add the textual content to.");
}
PDFLayoutRegion reg = block.CurrentRegion;
if (null == reg || reg.IsClosed)
{
this.Context.TraceLog.Add(TraceLevel.Error, LOG_CATEGORY, "There is no open region in block '" + block.ToString() + "' on page '" + pg.ToString() + "' to add content to.");
return(null);
throw new InvalidOperationException("There is no open block to add the textual content to.");
}
PDFLayoutLine line;
if (reg.HasOpenItem)
{
line = (PDFLayoutLine)reg.CurrentItem;
}
else
{
line = reg.BeginNewLine();
startedLine = true;
//No Inset spacer as this will be handled by the begin run
}
return(line);
}