rendering multiattributed textview - c++

Question

problem: I have a Textview with different Texttags in different selected text areas. At the end of editing, i would like to render this multi tagged textbuffer/textview into drawingarea.But I am not getting how can I render multi tagged textview using Pango/cairo layout ?. It would be great if I get any Gtk+/Gtkmm code that shows text drawing.
EX: Lets say My text is "AAABBB" and in this AAA has bold tag set and BBB is non bold and italic set..now how can i render this kind of text ?

Answer 1

Assuming you're looking for a c++ example, check if code below would work for you:
#include <gtk/gtk.h>
static gboolean on_expose_event_0(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
GdkScreen *screen = gdk_drawable_get_screen(widget->window);
PangoRenderer *renderer = gdk_pango_renderer_get_default (screen);
GdkGC *gc = gdk_gc_new(widget->window);
gdk_pango_renderer_set_drawable(GDK_PANGO_RENDERER (renderer), widget->window);
gdk_pango_renderer_set_gc(GDK_PANGO_RENDERER (renderer), gc);
PangoContext *context = gdk_pango_context_get_for_screen (screen);
PangoLayout *layout = pango_layout_new (context);
pango_layout_set_markup(layout, "<b>AAA</b><i>bbb</i>", -1);
PangoFontDescription *font = pango_font_description_from_string("Times 20");
pango_layout_set_font_description(layout, font);
pango_font_description_free(font);
pango_renderer_draw_layout (renderer, layout, 1, 1);
gdk_pango_renderer_set_drawable(GDK_PANGO_RENDERER (renderer), NULL);
gdk_pango_renderer_set_gc(GDK_PANGO_RENDERER (renderer), NULL);
g_object_unref(layout);
g_object_unref(context);
g_object_unref(gc);
return FALSE;
}
int main( int argc, char *argv[])
{
GtkWidget *window;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_widget_add_events (window, GDK_BUTTON_PRESS_MASK);
g_signal_connect(window, "expose-event", G_CALLBACK(on_expose_event_0), NULL);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_title(GTK_WINDOW(window), "pango test");
gtk_window_set_default_size(GTK_WINDOW(window), 400, 300);
gtk_widget_set_app_paintable(window, TRUE);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
There is also an example on using pango with cairo here: Using Pango with Cairo
hope this helps, regards