/// <summary>
/// Create PDF pages from given HTML and appends them to the provided PDF document.<br/>
/// </summary>
/// <param name="document">PDF document to append pages to</param>
/// <param name="html">HTML source to create PDF from</param>
/// <param name="config">the configuration to use for the PDF generation (page size/page orientation/margins/etc.)</param>
/// <param name="cssData">optional: the style to use for html rendering (default - use W3 default style)</param>
/// <param name="stylesheetLoad">optional: can be used to overwrite stylesheet resolution logic</param>
/// <param name="imageLoad">optional: can be used to overwrite image resolution logic</param>
/// <returns>the generated image of the html</returns>
public static void AddPdfPages(PdfDocument document, string html, PdfGenerateConfig config, CssData cssData = null, EventHandler <HtmlStylesheetLoadEventArgs> stylesheetLoad = null, EventHandler <HtmlImageLoadEventArgs> imageLoad = null)
{
XSize orgPageSize;
// get the size of each page to layout the HTML in
if (config.PageSize != PageSize.Undefined)
{
orgPageSize = PageSizeConverter.ToSize(config.PageSize);
}
else
{
orgPageSize = config.ManualPageSize;
}
if (config.PageOrientation == PageOrientation.Landscape)
{
// invert pagesize for landscape
orgPageSize = new XSize(orgPageSize.Height, orgPageSize.Width);
}
var pageSize = new XSize(orgPageSize.Width - config.MarginLeft - config.MarginRight, orgPageSize.Height - config.MarginTop - config.MarginBottom);
if (!string.IsNullOrEmpty(html))
{
using (var container = new HtmlContainer())
{
if (stylesheetLoad != null)
{
container.StylesheetLoad += stylesheetLoad;
}
if (imageLoad != null)
{
container.ImageLoad += imageLoad;
}
container.Location = new XPoint(config.MarginLeft, config.MarginTop);
container.MaxSize = new XSize(pageSize.Width, 0);
container.SetHtml(html, cssData);
container.PageSize = pageSize;
container.MarginBottom = config.MarginBottom;
container.MarginLeft = config.MarginLeft;
container.MarginRight = config.MarginRight;
container.MarginTop = config.MarginTop;
// layout the HTML with the page width restriction to know how many pages are required
using (var measure = XGraphics.CreateMeasureContext(pageSize, XGraphicsUnit.Point, XPageDirection.Downwards))
{
container.PerformLayout(measure);
}
// while there is un-rendered HTML, create another PDF page and render with proper offset for the next page
double scrollOffset = 0;
while (scrollOffset > -container.ActualSize.Height)
{
var page = document.AddPage();
page.Height = orgPageSize.Height;
page.Width = orgPageSize.Width;
using (var g = XGraphics.FromPdfPage(page))
{
//g.IntersectClip(new XRect(config.MarginLeft, config.MarginTop, pageSize.Width, pageSize.Height));
g.IntersectClip(new XRect(0, 0, page.Width, page.Height));
container.ScrollOffset = new XPoint(0, scrollOffset);
container.PerformPaint(g);
}
scrollOffset -= pageSize.Height;
}
// add web links and anchors
HandleLinks(document, container, orgPageSize, pageSize);
}
}
}