/// <summary>
/// Raises the System.Drawing.Printing.PrintDocument.PrintPage event. It is called
/// before a page prints.
/// </summary>
/// <param name="e"> A System.Drawing.Printing.PrintPageEventArgs that contains the event data.</param>
protected override void OnPrintPage(PrintPageEventArgs e)
{
base.OnPrintPage(e);
IntPtr hdc = IntPtr.Zero;
IntPtr currentPage = IntPtr.Zero;
try
{
if (e.Cancel)
{
return;
}
currentPage = Pdfium.FPDF_LoadPage(_docForPrint, _pageForPrint);
if (currentPage == IntPtr.Zero)
{
e.Cancel = true;
return;
}
double dpiX = e.Graphics.DpiX;
double dpiY = e.Graphics.DpiY;
double width, height;
double x, y;
CalcSize(currentPage, dpiX, dpiY, e.PageSettings.PrintableArea, e.PageSettings.Landscape, out width, out height, out x, out y);
PageRotate rotation = CalcRotation(currentPage, e.PageSettings.Landscape, ref width, ref height, ref x, ref y);
using (var page = PdfPage.FromHandle(_pdfDoc, currentPage, _pageForPrint))
{
OnBeforeRenderPage(page, width, height, rotation);
}
hdc = e.Graphics.GetHdc();
Pdfium.SetWorldTransform(hdc, new FS_MATRIX(1, 0, 0, 1, x, y));
Pdfium.FPDF_RenderPage(
hdc,
currentPage,
(int)0,
(int)0,
(int)(width),
(int)(height),
rotation,
RenderFlags);
//Print next page
if (_pageForPrint < PrinterSettings.ToPage - (_useDP ? PrinterSettings.FromPage : 1))
{
_pageForPrint++;
e.HasMorePages = true;
}
}
finally
{
if (hdc != IntPtr.Zero)
{
e.Graphics.ReleaseHdc(hdc);
}
hdc = IntPtr.Zero;
if (currentPage != IntPtr.Zero)
{
Pdfium.FPDF_ClosePage(currentPage);
}
currentPage = IntPtr.Zero;
}
}