CODEWITHSUNDEEP
c++gtkcairopango
user1109856
user1109856

Reputation: 61

rendering multiattributed textview

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 ?

Upvotes: 0

Views: 514

Answers (1)

serge_gubenko
serge_gubenko

Reputation: 20492

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

Upvotes: 1

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