private void OnBeginPrint(object sender, Gtk.BeginPrintArgs args)
{
Gtk.PrintOperation op = (Gtk.PrintOperation)sender;
Gtk.PrintContext context = args.Context;
timestamp_footer = CreateTimestampLayout(context);
// FIXME: These should be configurable settings later (UI Change)
margin_top = CmToPixel(1.5, context.DpiY);
margin_left = CmToPixel(1, context.DpiX);
margin_right = CmToPixel(1, context.DpiX);
margin_bottom = 0;
double max_height = Pango.Units.FromPixels((int)context.Height -
margin_top - margin_bottom - ComputeFooterHeight(context));
Gtk.TextIter position;
Gtk.TextIter end_iter;
Buffer.GetBounds(out position, out end_iter);
double page_height = 0;
bool done = position.Compare(end_iter) >= 0;
while (!done)
{
Gtk.TextIter line_end = position;
if (!line_end.EndsLine())
{
line_end.ForwardToLineEnd();
}
int paragraph_number = position.Line;
int indentation;
using (Pango.Layout layout = CreateParagraphLayout(
context, position, line_end, out indentation)) {
Pango.Rectangle ink_rect = Pango.Rectangle.Zero;
Pango.Rectangle logical_rect = Pango.Rectangle.Zero;
for (int line_in_paragraph = 0; line_in_paragraph < layout.LineCount;
line_in_paragraph++)
{
Pango.LayoutLine line = layout.GetLine(line_in_paragraph);
line.GetExtents(ref ink_rect, ref logical_rect);
if (page_height + logical_rect.Height >= max_height)
{
PageBreak page_break = new PageBreak(
paragraph_number, line_in_paragraph);
page_breaks.Add(page_break);
page_height = 0;
}
page_height += logical_rect.Height;
}
position.ForwardLine();
done = position.Compare(end_iter) >= 0;
}
}
op.NPages = page_breaks.Count + 1;
}
private void Control_BeginPrint(object o, Gtk.BeginPrintArgs args)
{
if (_control != null && PageCount == -1)
{
var paperHeight = args.Context.Height;
var paperWidth = args.Context.Width;
_preferredSize = _control.GetPreferredSize();
#if GTK3
// to draw the widget using Cairo, we need to use an offscreen window
var gtkWidget = _control.GetContainerWidget();
_oldParent = gtkWidget.Parent;
_offscreenWindow = new Gtk.OffscreenWindow();
_offscreenWindow.Child = gtkWidget;
_offscreenWindow.SetSizeRequest((int)Math.Max(_preferredSize.Width, paperWidth), (int)Math.Max(_preferredSize.Height, paperHeight));
_offscreenWindow.ShowAll();
#endif
PageCount = (int)Math.Ceiling(_preferredSize.Height / paperHeight);
}
Callback.OnPrinting(Widget, EventArgs.Empty);
}
/// <summary>
/// OnBeginPrint - Load up the Document to be printed and analyze it.
/// </summary>
/// <param name="obj">The Print Operation</param>
/// <param name="args">The BeginPrintArgs passed by the Print Operation</param>
private void OnBeginPrint(object obj, Gtk.BeginPrintArgs args)
{
}
