private TResult _ownerInvoke <TResult>(Fn <TResult> method)
{
if (owner.InvokeRequired)
{
return((TResult)owner.Invoke(method));
}
else
{
return(method());
}
}
private void _document_PrintPage(object sender, PrintPageEventArgs e)
{
// running on a seperate thread, so we invoke _webFramePrivate
// methods on the owners ui thread
if (_printGfx == null)
{
// initialise printing
_printGfx = e.Graphics;
_hDC = _printGfx.GetHdc().ToInt32();
_owner.Invoke(new MethodInvoker(delegate() {
_webFramePrivate.setInPrintingMode(1, _hDC);
}));
_nPages = (uint)_owner.Invoke(
new GetPrintedPageCountDelegate(delegate() {
return(_webFramePrivate.getPrintedPageCount(_hDC));
}));
_page = 1;
}
_owner.Invoke(new MethodInvoker(delegate() {
_webFramePrivate.spoolPages(_hDC, _page, _page, IntPtr.Zero);
}));
++_page;
if (_page <= _nPages)
{
e.HasMorePages = true;
}
else
{
_owner.Invoke(new MethodInvoker(delegate() {
_webFramePrivate.setInPrintingMode(0, _hDC);
}));
e.HasMorePages = false;
_printGfx = null;
_nPages = 0;
}
}