Struct gtk4::PrintContext
source · #[repr(transparent)]pub struct PrintContext { /* private fields */ }
Expand description
A PrintContext
encapsulates context information that is required when
drawing pages for printing.
This includes the cairo context and important parameters like page size
and resolution. It also lets you easily create pango::Layout
and
pango::Context
objects that match the font metrics of the cairo surface.
PrintContext
objects get passed to the
begin-print
,
end-print
,
request-page-setup
and
draw-page
signals on the
PrintOperation
object.
Using GtkPrintContext in a ::draw-page callback
⚠️ The following code is in c ⚠️
static void
draw_page (GtkPrintOperation *operation,
GtkPrintContext *context,
int page_nr)
{
cairo_t *cr;
PangoLayout *layout;
PangoFontDescription *desc;
cr = gtk_print_context_get_cairo_context (context);
// Draw a red rectangle, as wide as the paper (inside the margins)
cairo_set_source_rgb (cr, 1.0, 0, 0);
cairo_rectangle (cr, 0, 0, gtk_print_context_get_width (context), 50);
cairo_fill (cr);
// Draw some lines
cairo_move_to (cr, 20, 10);
cairo_line_to (cr, 40, 20);
cairo_arc (cr, 60, 60, 20, 0, M_PI);
cairo_line_to (cr, 80, 20);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 5);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
cairo_stroke (cr);
// Draw some text
layout = gtk_print_context_create_pango_layout (context);
pango_layout_set_text (layout, "Hello World! Printing is easy", -1);
desc = pango_font_description_from_string ("sans 28");
pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
cairo_move_to (cr, 30, 20);
pango_cairo_layout_path (cr, layout);
// Font Outline
cairo_set_source_rgb (cr, 0.93, 1.0, 0.47);
cairo_set_line_width (cr, 0.5);
cairo_stroke_preserve (cr);
// Font Fill
cairo_set_source_rgb (cr, 0, 0.0, 1.0);
cairo_fill (cr);
g_object_unref (layout);
}
Implements
Implementations§
source§impl PrintContext
impl PrintContext
sourcepub fn create_pango_context(&self) -> Context
pub fn create_pango_context(&self) -> Context
Creates a new pango::Context
that can be used with the
PrintContext
.
Returns
a new Pango context for @self
sourcepub fn create_pango_layout(&self) -> Layout
pub fn create_pango_layout(&self) -> Layout
Creates a new pango::Layout
that is suitable for use
with the PrintContext
.
Returns
a new Pango layout for @self
sourcepub fn cairo_context(&self) -> Context
pub fn cairo_context(&self) -> Context
Obtains the cairo context that is associated with the
PrintContext
.
Returns
the cairo context of @self
sourcepub fn dpi_x(&self) -> f64
pub fn dpi_x(&self) -> f64
Obtains the horizontal resolution of the PrintContext
,
in dots per inch.
Returns
the horizontal resolution of @self
sourcepub fn dpi_y(&self) -> f64
pub fn dpi_y(&self) -> f64
Obtains the vertical resolution of the PrintContext
,
in dots per inch.
Returns
the vertical resolution of @self
sourcepub fn page_setup(&self) -> PageSetup
pub fn page_setup(&self) -> PageSetup
Obtains the PageSetup
that determines the page
dimensions of the PrintContext
.
Returns
the page setup of @self
sourcepub fn pango_fontmap(&self) -> FontMap
pub fn pango_fontmap(&self) -> FontMap
Returns a pango::FontMap
that is suitable for use
with the PrintContext
.
Returns
the font map of @self
sourcepub fn set_cairo_context(&self, cr: &Context, dpi_x: f64, dpi_y: f64)
pub fn set_cairo_context(&self, cr: &Context, dpi_x: f64, dpi_y: f64)
Sets a new cairo context on a print context.
This function is intended to be used when implementing an internal print preview, it is not needed for printing, since GTK itself creates a suitable cairo context in that case.
cr
the cairo context
dpi_x
the horizontal resolution to use with @cr
dpi_y
the vertical resolution to use with @cr
Trait Implementations§
source§impl Clone for PrintContext
impl Clone for PrintContext
source§impl Debug for PrintContext
impl Debug for PrintContext
source§impl Display for PrintContext
impl Display for PrintContext
source§impl HasParamSpec for PrintContext
impl HasParamSpec for PrintContext
type ParamSpec = ParamSpecObject
§type SetValue = PrintContext
type SetValue = PrintContext
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, PrintContext>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for PrintContext
impl Hash for PrintContext
source§impl Ord for PrintContext
impl Ord for PrintContext
source§impl ParentClassIs for PrintContext
impl ParentClassIs for PrintContext
source§impl<OT: ObjectType> PartialEq<OT> for PrintContext
impl<OT: ObjectType> PartialEq<OT> for PrintContext
source§impl<OT: ObjectType> PartialOrd<OT> for PrintContext
impl<OT: ObjectType> PartialOrd<OT> for PrintContext
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for PrintContext
impl StaticType for PrintContext
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for PrintContext
Auto Trait Implementations§
impl RefUnwindSafe for PrintContext
impl !Send for PrintContext
impl !Sync for PrintContext
impl Unpin for PrintContext
impl UnwindSafe for PrintContext
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