A GtkPrintContext encapsulates context information that is required when
drawing pages for printing, such as the cairo context and important
parameters like page size and resolution. It also lets you easily
create PangoLayout and PangoContext objects that match the font metrics
of the cairo surface. GtkPrintContext objects gets passed to the ::begin-print, ::end-print,
::request-page-setup and ::draw-page signals on the GtkPrintOperation. Using GtkPrintContext in a ::draw-page callback
draw_page <- function(operation, context, page_nr)
{
cr <- context$getCairoContext() # Draw a red rectangle, as wide as the paper (inside the margins)
cr$setSourceRgb(1.0, 0, 0)
cr$rectangle(0, 0, context$getWidth(), 50) cr$fill() # Draw some lines
cr$moveTo(20, 10)
cr$lineTo(40, 20)
cr$arc(60, 60, 20, 0, pi)
cr$lineTo(80, 20) cr$setSourceRgb(0, 0, 0)
cr$setLineWidth(5)
cr$setLineCap("round")
cr$setLineJoin("round") cr$stroke() # Draw some text layout <- context$createLayout()
layout$setText("Hello World! Printing is easy")
desc <- pangoFontDescriptionFromString("sans 28")
layout$setFontDescription(desc) cr$moveTo(30, 20)
cr$layoutPath(layout) # Font Outline
cr$setSourceRgb(0.93, 1.0, 0.47)
cr$setLineWidth(0.5)
cr$strokePreserve() # Font Fill
cr$setSourceRgb(0, 0.0, 1.0)
cr$fill()
}
Printing support was added in GTK+ 2.10.