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Functions
Description
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.
Example 50. Using GtkPrintContext in a ::draw-page callback
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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_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); } |
Printing support was added in GTK+ 2.10.
Functions
gtk_print_context_get_cairo_context ()
cairo_t *
gtk_print_context_get_cairo_context (GtkPrintContext *context);
Obtains the cairo context that is associated with the GtkPrintContext.
Since 2.10
gtk_print_context_set_cairo_context ()
void gtk_print_context_set_cairo_context (GtkPrintContext *context,cairo_t *cr,double dpi_x,double dpi_y);
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.
Parameters
context |
||
cr |
the cairo context |
|
dpi_x |
the horizontal resolution to use with |
|
dpi_y |
the vertical resolution to use with |
Since 2.10
gtk_print_context_get_page_setup ()
GtkPageSetup *
gtk_print_context_get_page_setup (GtkPrintContext *context);
Obtains the GtkPageSetup that determines the page dimensions of the GtkPrintContext.
Since 2.10
gtk_print_context_get_width ()
gdouble
gtk_print_context_get_width (GtkPrintContext *context);
Obtains the width of the GtkPrintContext, in pixels.
Since 2.10
gtk_print_context_get_height ()
gdouble
gtk_print_context_get_height (GtkPrintContext *context);
Obtains the height of the GtkPrintContext, in pixels.
Since 2.10
gtk_print_context_get_dpi_x ()
gdouble
gtk_print_context_get_dpi_x (GtkPrintContext *context);
Obtains the horizontal resolution of the GtkPrintContext, in dots per inch.
Since 2.10
gtk_print_context_get_dpi_y ()
gdouble
gtk_print_context_get_dpi_y (GtkPrintContext *context);
Obtains the vertical resolution of the GtkPrintContext, in dots per inch.
Since 2.10
gtk_print_context_get_pango_fontmap ()
PangoFontMap *
gtk_print_context_get_pango_fontmap (GtkPrintContext *context);
Returns a PangoFontMap that is suitable for use with the GtkPrintContext.
Since 2.10
gtk_print_context_create_pango_context ()
PangoContext *
gtk_print_context_create_pango_context
(GtkPrintContext *context);
Creates a new PangoContext that can be used with the GtkPrintContext.
Since 2.10
gtk_print_context_create_pango_layout ()
PangoLayout *
gtk_print_context_create_pango_layout (GtkPrintContext *context);
Creates a new PangoLayout that is suitable for use with the GtkPrintContext.
Since 2.10
gtk_print_context_get_hard_margins ()
gboolean gtk_print_context_get_hard_margins (GtkPrintContext *context,gdouble *top,gdouble *bottom,gdouble *left,gdouble *right);
Obtains the hardware printer margins of the GtkPrintContext, in units.
Parameters
context |
||
top |
top hardware printer margin. |
[out] |
bottom |
bottom hardware printer margin. |
[out] |
left |
left hardware printer margin. |
[out] |
right |
right hardware printer margin. |
[out] |
Since 2.20