THE TEXT VIEW WIDGET in Font

Painting Data Matrix 2d barcode in Font THE TEXT VIEW WIDGET

/* Add the name of the text g_object_set_data (G_OBJECT g_object_set_data (G_OBJECT g_object_set_data (G_OBJECT g_object_set_data (G_OBJECT

tag as a data parameter of the object. */ (bold), "tag", "bold"); (italic), "tag", "italic"); (underline), "tag", "underline"); (strike), "tag", "strike");

/* Connect each of the buttons and the combo box to the necessary signals. */ g_signal_connect (G_OBJECT (bold), "clicked", G_CALLBACK (format), (gpointer) textview); g_signal_connect (G_OBJECT (italic), "clicked", G_CALLBACK (format), (gpointer) textview); g_signal_connect (G_OBJECT (underline), "clicked", G_CALLBACK (format), (gpointer) textview); g_signal_connect (G_OBJECT (strike), "clicked", G_CALLBACK (format), (gpointer) textview); g_signal_connect (G_OBJECT (scale), "changed", G_CALLBACK (scale_changed), (gpointer) textview); g_signal_connect (G_OBJECT (clear), "clicked", G_CALLBACK (clear_clicked), (gpointer) textview); /* Pack the widgets into a GtkVBox, vbox = gtk_vbox_new (TRUE, 5); gtk_box_pack_start (GTK_BOX (vbox), gtk_box_pack_start (GTK_BOX (vbox), gtk_box_pack_start (GTK_BOX (vbox), gtk_box_pack_start (GTK_BOX (vbox), gtk_box_pack_start (GTK_BOX (vbox), gtk_box_pack_start (GTK_BOX (vbox), GtkHBox, and then into the window. */ bold, FALSE, FALSE, 0); italic, FALSE, FALSE, 0); underline, FALSE, FALSE, 0); strike, FALSE, FALSE, 0); scale, FALSE, FALSE, 0); clear, FALSE, FALSE, 0);

scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_container_add (GTK_CONTAINER (scrolled_win), textview); gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win), GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS); hbox = gtk_hbox_new (FALSE, 5); gtk_box_pack_start (GTK_BOX (hbox), scrolled_win, TRUE, TRUE, 0); gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, TRUE, 0); gtk_container_add (GTK_CONTAINER (window), hbox); gtk_widget_show_all (window);

gtk_main(); return 0; } /* Retrieve the tag from the "tag" object data and apply it to the selection. */ static void format (GtkWidget *widget, GtkTextView *textview) { GtkTextIter start, end; GtkTextBuffer *buffer; gchar *tagname; tagname = (gchar*) g_object_get_data (G_OBJECT (widget), "tag"); buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_get_selection_bounds (buffer, &start, &end); gtk_text_buffer_apply_tag_by_name (buffer, tagname, &start, &end); } /* Apply the selected text size property as the tag. */ static void scale_changed (GtkComboBox *combo, GtkTextView *textview) { const gchar *text; if (gtk_combo_box_get_active (combo) == -1) return; text = gtk_combo_box_get_active_text (combo); g_object_set_data (G_OBJECT (combo), "tag", (gpointer) text); format (GTK_WIDGET (combo), textview); gtk_combo_box_set_active (combo, -1); } /* Remove all of the tags from the selected text. */ static void clear_clicked (GtkButton *button, GtkTextView *textview) { GtkTextIter start, end; GtkTextBuffer *buffer;

buffer = gtk_text_view_get_buffer (textview); gtk_text_buffer_get_selection_bounds (buffer, &start, &end); gtk_text_buffer_remove_all_tags (buffer, &start, &end); } When you create a text tag, you normally have to add it to a GtkTextBuffer s tag table, an object that holds all of the tags available to a text buffer. You can create a new GtkTextTag object with gtk_text_tag_new() and then add it to the tag table. However, you can do this all in one step with gtk_text_buffer_create_tag(). GtkTextTag* gtk_text_buffer_create_tag (GtkTextBuffer *buffer, const gchar *tag_name, const gchar *first_property_name, ...); The first two parameters of the function allow you to specify the text buffer to whose tag table the GtkTextTag will be added and a name to give the text tag. This name can be used to reference a tag for which you do not have the GtkTextTag object anymore. The next set of parameters is a NULL-terminated list of GtkTextTag style properties and their values. For example, if you wanted to create a text tag that sets the background and foreground colors as black and white respectively, you could use the following function. This function returns the text tag that was created, although it will have already been added to the text buffer s tag table. tag = gtk_text_buffer_create_tag (buffer, "colors", "background", "#000000", "foreground", "#FFFFFF", NULL); There are a large number of style properties available in GTK+. A full list of GtkTextTag styles is shown in Appendix C. The table shows the name of each property, a short description of its use, and what type of value it accepts. Once you have created a text tag and added it to a GtkTextBuffer s tag table, you can apply it to ranges of text. In Listing 7-7, the tag is applied to selected text when a button is clicked. If there is no selected text, the cursor position will be set to the style. All text typed at that position would have the tag applied as well. Tags are generally applied to text with gtk_text_buffer_apply_tag_by_name(). The tag is applied to the text between the start and end iterators. If you still have access to the GtkTextTag object, you can also apply a tag with gtk_text_buffer_apply_tag(). void gtk_text_buffer_apply_tag_by_name (GtkTextBuffer *buffer, const gchar *tag_name, const GtkTextIter *start, const GtkTextIter *end);