forked from AuroraMiddleware/gtk
176 lines
3.3 KiB
Plaintext
176 lines
3.3 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GtkPrintContext
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<!-- ##### SECTION Short_Description ##### -->
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Encapsulates context for drawing pages
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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A GtkPrintContext encapsulates context information that is required when
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drawing pages for printing, such as the cairo context and important
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parameters like page size and resolution. It also lets you easily
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create #PangoLayout and #PangoContext objects that match the font metrics
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of the cairo surface.
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</para>
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<para>
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GtkPrintContext objects gets passed to the ::begin-print, ::end-print,
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::request-page-setup and ::draw-page signals on the #GtkPrintOperation.
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</para>
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<example>
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<title>Using GtkPrintContext in a ::draw-page callback</title>
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<programlisting>
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static void
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draw_page (GtkPrintOperation *operation,
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GtkPrintContext *context,
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int page_nr)
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{
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cairo_t *cr;
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PangoLayout *layout;
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PangoFontDescription *desc;
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cr = gtk_print_context_get_cairo (context);
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/* Draw a red rectangle, as wide as the paper (inside the margins) */
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cairo_set_source_rgb (cr, 1.0, 0, 0);
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cairo_rectangle (cr, 0, 0, gtk_print_context_get_width (context), 50);
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cairo_fill (cr);
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/* Draw some lines */
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cairo_move_to (cr, 20, 10);
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cairo_line_to (cr, 40, 20);
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cairo_arc (cr, 60, 60, 20, 0, M_PI);
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cairo_line_to (cr, 80, 20);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_set_line_width (cr, 5);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
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cairo_stroke (cr);
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/* Draw some text */
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layout = gtk_print_context_create_layout (context);
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pango_layout_set_text (layout, "Hello World! Printing is easy", -1);
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desc = pango_font_description_from_string ("sans 28");
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pango_layout_set_font_description (layout, desc);
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pango_font_description_free (desc);
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cairo_move_to (cr, 30, 20);
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pango_cairo_layout_path (cr, layout);
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/* Font Outline */
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cairo_set_source_rgb (cr, 0.93, 1.0, 0.47);
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cairo_set_line_width (cr, 0.5);
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cairo_stroke_preserve (cr);
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/* Font Fill */
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cairo_set_source_rgb (cr, 0, 0.0, 1.0);
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cairo_fill (cr);
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g_object_unref (layout);
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}
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</programlisting>
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</example>
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<para>
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Printing support was added in GTK+ 2.10.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### SECTION Stability_Level ##### -->
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<!-- ##### STRUCT GtkPrintContext ##### -->
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<para>
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</para>
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<!-- ##### FUNCTION gtk_print_context_get_cairo_context ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_get_page_setup ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_get_width ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_get_height ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_get_dpi_x ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_get_dpi_y ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_get_pango_fontmap ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_create_pango_context ##### -->
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<para>
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</para>
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@context:
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@Returns:
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<!-- ##### FUNCTION gtk_print_context_create_pango_layout ##### -->
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<para>
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</para>
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@context:
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@Returns:
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