//
// 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);
}
//
// main override
//
#region protected override void DoLayoutComponent()
/// <summary>
/// Performs the actual layout of the list and items in it.
/// </summary>
protected override void DoLayoutComponent()
{
if (this.Context.ShouldLogDebug)
{
this.Context.TraceLog.Begin(TraceLevel.Debug, ListEngineLogCategory, string.Format("Starting the layout of the list {0}", this.List.ID));
}
this.ContinueLayout = true;
this.CurrentBlock = this.Context.DocumentLayout.CurrentPage.LastOpenBlock();
if (this.CurrentBlock.CurrentRegion != null && this.CurrentBlock.CurrentRegion.HasOpenItem)
{
this.CurrentBlock.CurrentRegion.CloseCurrentItem();
}
PDFPositionOptions pos = this.FullStyle.CreatePostionOptions();
//Set up the outer container block that will hold the list and all it's items
_listBlock = this.CurrentBlock.BeginNewContainerBlock(this.List, this, this.FullStyle, pos.PositionMode);
PDFRect bounds = this.CurrentBlock.CurrentRegion.UnusedBounds;
if (bounds.X > 0)
{
bounds.X = PDFUnit.Zero;
}
if (pos.Width.HasValue)
{
bounds.Width = pos.Width.Value;
}
else if (pos.Margins.IsEmpty == false)
{
bounds.Width -= pos.Margins.Left + pos.Margins.Right;
}
if (pos.Height.HasValue)
{
bounds.Height = pos.Height.Value;
}
else if (pos.Margins.IsEmpty == false)
{
bounds.Height -= pos.Margins.Top + pos.Margins.Bottom;
}
PDFColumnOptions columnOptions = new PDFColumnOptions()
{
AlleyWidth = PDFUnit.Zero, AutoFlow = false, ColumnCount = 1
};
_listBlock.InitRegions(bounds, pos, columnOptions, this.Context);
this.OpenListNumbering();
this.BuildListEntries(out _itemNumberWidth);
this.LayoutListItems(pos);
_listBlock.CurrentRegion.CloseCurrentItem();
_listBlock.CurrentRegion.Close();
_listBlock.Close();
this.CurrentBlock.CurrentRegion.AddToSize(_listBlock);
if (this.Context.ShouldLogDebug)
{
this.Context.TraceLog.End(TraceLevel.Debug, ListEngineLogCategory, string.Format("Completed the layout of the list {0}", this.List.ID));
}
this.CloseListNumbering();
}
/// <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
}
}
protected void EnsureContentsFit()
{
bool newPage;
PDFLayoutBlock block = this.CurrentBlock;
//re-retrieve our container block and region
//it could have changed whilst laying out other regions / pages.
PDFLayoutBlock containerBlock = block.Parent as PDFLayoutBlock;
if (block.IsClosed == false)
{
block.Close();
}
bool updateSize = false;
PDFSize updated = block.Size;
if (block.Position.MinimumHeight.HasValue && block.Height < block.Position.MinimumHeight.Value)
{
updated.Height = block.Position.MinimumHeight.Value - (block.Position.Padding.Top + block.Position.Padding.Bottom);
updateSize = true;
}
if (block.Position.MinimumWidth.HasValue && block.Width < block.Position.MinimumWidth.Value)
{
updated.Width = block.Position.MinimumWidth.Value - (block.Position.Padding.Left + block.Position.Padding.Right);
updateSize = true;
}
if (updateSize)
{
block.SetContentSize(updated.Width, updated.Height);
}
PDFLayoutRegion containerRegion = containerBlock.CurrentRegion;
//ADDED to support blocks flowing to the next region or page
PDFUnit vspace = containerRegion.TotalBounds.Height - containerRegion.UsedSize.Height;
PDFUnit req = block.Height;
bool canfitvertical = req <= vspace;
if (!canfitvertical && containerRegion.Contents.Count > 1)
{
PDFLayoutRegion prev = containerRegion;
if (this.MoveToNextRegion(req, ref containerRegion, ref containerBlock, out newPage))
{
prev.Contents.Remove(block);
containerRegion.AddExistingItem(block);
}
else
{
this.Context.TraceLog.Add(TraceLevel.Warning, LOG_CATEGORY, "Cannot fit the block for component " + this.Component.UniqueID + " in the avilable height (required = '" + req + "', available = '" + vspace + "'), and we cannot overflow to a new region. Layout of component stopped and returning.");
this.ContinueLayout = false;
}
}
else
{
//Region has not updated its size as the block was directly closed.
containerRegion.AddToSize(block);
}
}