Re: How can I change the font of a text field using non-deprecated way?

[Yuri Khan via gtk-app-devel-list]

On Sat, Sep 22, 2018 at 3:11 PM Радомир Хаџић via gtk-app-devel-list
 wrote:

> I'm trying to make a small application in C using GTK+3 (the latest
> stable). The application is going to have a text field implemented using
> GtkTextView where a user can write text. I also font a user to be able to
> change font, so I've added a font chooser using GtkFontChooserDialog.
>
> The problem is that I don't know how to actually set the font of a text
> field to the one that a user chose using font chooser. Well, at least not
> using an up-to-date method. I know I can use gtk_widget_override_font(),
> and though it works perfectly, I'd rather not use it since it's deprecated
> function so it's not meant to be used anymore.

The functionality you are describing is present in pretty much every
GTK+3-based text editor, so look at the source of any one of them.

Gedit (as of 3.18.3 as packaged in Ubuntu 16.04) uses
gtk_widget_override_font, and so does Mousepad (as of 0.4.0), and
what’s good for the stock text editors of GNOME and Xfce, is probably
good for you, too.
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Re: How can I change the font of a text field using non-deprecated way?

[Eric Cashon via gtk-app-devel-list]

 
Hi Radomir,

The function gtk_widget_override_font() is deprecated but as far as I know it 
still works fine in GTK3. 

With the Pango font description and the textview you should be able to set 
everything up without getting any deprecated warnings. It doesn't set the 
textview widget itself to a particular font but you do have the Pango font 
description that you can use elsewhere if needed.

Eric

    
//gcc -Wall font_chooser1.c -o font_chooser1 `pkg-config --cflags --libs 
gtk+-3.0`

#include 

static void show_font_chooser(GtkWidget *button, gpointer **user_data)
  {
    static gint i=1;
    GtkWidget *chooser=gtk_font_chooser_dialog_new("Font Chooser", 
GTK_WINDOW(user_data[0]));
    gint result=gtk_dialog_run(GTK_DIALOG(chooser));

    if(result==GTK_RESPONSE_OK)
  {   
    PangoFontDescription 
*desc=gtk_font_chooser_get_font_desc(GTK_FONT_CHOOSER(chooser));
    GtkTextBuffer 
*buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(user_data[1]));
    gchar *tag_name=g_strdup_printf("font-tag%i", i);
    GtkTextTag *font_tag=gtk_text_buffer_create_tag(buffer, tag_name, 
"font-desc", desc, NULL);
    g_ptr_array_add((GPtrArray*)user_data[2], (gpointer)font_tag);
    i++;
    g_free(tag_name);
    pango_font_description_free(desc);
  }
    
    gtk_widget_destroy(chooser);
  }
static void insert_text(GtkTextBuffer *textbuffer, GtkTextIter *location, gchar 
*text, gint len, GPtrArray *tags)
  {
    GtkTextIter *start=gtk_text_iter_copy(location);
    gtk_text_iter_backward_chars(start, len);
    //Get the last tag added to the tag array.
    GtkTextTag *font_tag=GTK_TEXT_TAG(g_ptr_array_index(tags, ((tags->len)-1)));
    gtk_text_buffer_apply_tag(textbuffer, font_tag, start, location);
    gtk_text_iter_free(start);
  }
int main(int argc, char *argv[])
  {
    gtk_init(, );

    GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Font Chooser");
    gtk_window_set_default_size(GTK_WINDOW(window), 300, 300);
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    gtk_container_set_border_width(GTK_CONTAINER(window), 20);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    GtkWidget *textview=gtk_text_view_new();
    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(textview), GTK_WRAP_CHAR);
    gtk_widget_set_hexpand(textview, TRUE);
    gtk_widget_set_vexpand(textview, TRUE);

    PangoContext *context=gtk_widget_get_pango_context(textview);
    PangoFontDescription *desc=pango_context_get_font_description(context);

    //For saving the tag pointers.
    GPtrArray *tags=g_ptr_array_new();

    GtkTextBuffer *buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));
    GtkTextTag *font_tag=gtk_text_buffer_create_tag(buffer, "font-tag", 
"font-desc", desc, NULL);
    g_ptr_array_add(tags, (gpointer)font_tag);
    g_signal_connect_after(buffer, "insert-text", G_CALLBACK(insert_text), 
tags); 

    GtkWidget *button=gtk_button_new_with_label("FontChooser");
    gtk_widget_set_hexpand(button, TRUE);
    gpointer user_data[]={window, textview, tags};
    g_signal_connect(button, "clicked", G_CALLBACK(show_font_chooser), 
user_data);

    GtkWidget *grid=gtk_grid_new();
    gtk_grid_attach(GTK_GRID(grid), textview, 0, 0, 1, 1);
    gtk_grid_attach(GTK_GRID(grid), button, 0, 1, 1, 1);

    gtk_container_add(GTK_CONTAINER(window), grid);

    gtk_widget_show_all(window);
    
    gtk_main();

    return 0;
  }

 
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