private double BuildContext(PageRenderData context, ParagraphInfo p, double width,
double defaultFontSize, int paragraphID, double top)
{
TextAlignment align = GetTextAlignment(p);
var list = new List<TextElement>();
bool firstLine = true;
foreach (TextElementBase baseInlineItem in p.Inlines)
{
if (baseInlineItem is EOLElement)
{
top = AppendLine(context, list, align, p, width, top, defaultFontSize, paragraphID,
firstLine);
firstLine = false;
list.Clear();
}
else
{
var inlineItem = (TextElement) baseInlineItem;
list.Add(inlineItem);
}
}
return AppendLine(context, list, align == TextAlignment.Justify ? TextAlignment.Left : align, p, width,
top, defaultFontSize, paragraphID, firstLine);
}
private double BuildImageContext(PageRenderData context, ParagraphInfo p, double top)
{
var item = (ImageElement)p.Inlines.First();
BookImage bookImage = _images.First(t => t.ID == item.ImageID);
double offsetX = (context.PageSize.Width - p.MarginLeft - p.MarginRight - item.Width) / 2.0;
var imageContext = CreateImage(context, offsetX, top, item, bookImage);
context.Images.Add(imageContext);
return top + item.Height;
}
public PageBuilder(Size pageSize, IEnumerable<BookImage> images)
{
_images = images;
_pageSize = pageSize;
_height = 0.0;
_paragraph = null;
_page = new PageInfo
{
FirstTokenID = -1
};
}
private bool AppendToPage(TextTokenBlock block)
{
if (_page.FirstTokenID < 0)
_page.FirstTokenID = block.FirstTokenID;
double height = block.Height * AppSettings.Default.FontSettings.FontInterval;
if (_height + height <= _pageSize.Height)
{
_height += height;
_page.LastTokenID = block.LastTokenID;
_page.LastTextPart = block.GetLastPart();
if (_paragraph == null)
{
_paragraph = CreateParagraph(block);
_page.Paragraphs.Add(_paragraph);
}
AddInlineToParagraph(block);
return true;
}
return false;
}
private static double AppendLine(PageRenderData context, ICollection<TextElement> inlines, TextAlignment align,
ParagraphInfo p, double width, double top, double defaultFontSize,
int paragraphID, bool firstLine)
{
if (inlines.Count == 0)
return top;
double height = inlines.Max((t => t.Height));
double inlinesWidth = inlines.Sum((t => t.Width));
double leftMargin = 0.0;
double wordSpacing = 0.0;
double textIndent = !firstLine || align != TextAlignment.Justify && align != TextAlignment.Left
? 0.0
: p.TextIndent;
width -= p.MarginRight + p.MarginLeft + textIndent;
switch (align)
{
case TextAlignment.Center:
leftMargin = (width - inlinesWidth)/2.0;
break;
case TextAlignment.Right:
leftMargin = width - inlinesWidth;
break;
case TextAlignment.Justify:
wordSpacing = (width - inlinesWidth)/(inlines.Count - 1);
break;
}
double tempLeftMargin = leftMargin + (p.MarginLeft + textIndent);
inlines.Aggregate(tempLeftMargin, (current, inlineItem) =>
BuildInlineItem(context, top, defaultFontSize, paragraphID, inlineItem, height, current, wordSpacing));
return top + height * AppSettings.Default.FontSettings.FontInterval;
}
private static TextAlignment GetTextAlignment(ParagraphInfo p)
{
if (!string.IsNullOrEmpty(p.TextAlign))
{
switch (p.TextAlign)
{
case "center":
return TextAlignment.Center;
case "right":
return TextAlignment.Right;
case "left":
return TextAlignment.Left;
}
}
return TextAlignment.Justify;
}
private void AddInlineToParagraph(TextTokenBlock block)
{
_page.Lines.Add(block);
foreach (TextElementBase baseInlineItem in block.Inlines)
{
if (!(baseInlineItem is EOPElement))
{
_paragraph.Inlines.Add(baseInlineItem);
}
else
{
_paragraph = null;
break;
}
}
}
