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CHAPTER 7 THE TEXT VIEW WIDGET
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Listing 7-9. Inserting Child Widgets into a Text Buffer (childwidgets.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *scrolled_win, *textview, *button; GtkTextChildAnchor *anchor; GtkTextIter iter; GtkTextBuffer *buffer; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Child Widgets"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, 100); textview = gtk_text_view_new (); buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview)); gtk_text_buffer_set_text (buffer, "\n Click to exit!", -1); /* Create a new child widget anchor at the specified iterator. */ gtk_text_buffer_get_iter_at_offset (buffer, &iter, 8); anchor = gtk_text_buffer_create_child_anchor (buffer, &iter); /* Insert a GtkButton widget at the child anchor. */ button = gtk_button_new_with_label ("the button"); gtk_text_view_add_child_at_anchor (GTK_TEXT_VIEW (textview), button, anchor); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) window); 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); gtk_container_add (GTK_CONTAINER (window), scrolled_win); gtk_widget_show_all (window); gtk_main(); return 0; }
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CHAPTER 7 THE TEXT VIEW WIDGET
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When creating a GtkTextChildAnchor, you need to initialize it and insert it into a GtkTextBuffer. You can do this by calling gtk_text_buffer_create_child_anchor(). GtkTextChildAnchor* gtk_text_buffer_create_child_anchor (GtkTextBuffer *buffer, GtkTextIter *iter); A child anchor is created at the location of the specified text iterator. This child anchor is simply a mark that tells GTK+ that a child widget can be added to that point within the text buffer. Next, you need to use gtk_text_view_add_child_at_anchor() to add a child widget to the anchor point. As with GdkPixbuf objects, child widgets appear as the 0xFFFC character. This means that, if you see that character, you need to check whether it is a child widget or a pixbuf, because they will be indistinguishable otherwise. void gtk_text_view_add_child_at_anchor (GtkTextView *textview, GtkWidget *child, GtkTextChildAnchor *anchor); To check whether a child widget is at the location of an 0xFFFC character, you should call gtk_text_iter_get_child_anchor(), which will return NULL if a child anchor is not located at that position. GtkTextChildAnchor* gtk_text_iter_get_child_anchor (const GtkTextIter *iter); You can then retrieve a list of the widgets added at the anchor point with gtk_text_ child_anchor_get_widgets(). You need to note that only one child widget can be added at a single anchor, so the returned list will usually contain only one element. GList* gtk_text_child_anchor_get_widgets (GtkTextChildAnchor *anchor); The exception is when you are using the same buffer for multiple text views. In this case, multiple widgets can be added to the same anchor in the text views, as long as no text view contains more than one widget. This is because of the fact that the child widget is attached to an anchor handled by the text view instead of the text buffer. When you are finished with the list of widgets, you need to free it with g_list_free().
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GtkSourceView
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GtkSourceView is a widget that is not actually a part of the GTK+ libraries. It is an external library used to extend the GtkTextView widget. If you have ever used GEdit, you will have experienced the GtkSourceView widget.
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There is a large list of features that the GtkSourceView widget adds to text views. A few of the most notable ones follow: Line numbering Syntax highlighting for many programming and scripting languages Printing support for documents containing syntax highlighting Automatic indentation Bracket matching Undo/Redo support Source markers for denoting locations in source code Highlighting the current line Figure 7-10 shows a screenshot of GEdit using the GtkSourceView widget. It has line numbering, syntax highlighting, bracket matching, and line highlighting turned on.
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Figure 7-10. Screenshot of a GtkSourceView widget
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CHAPTER 7 THE TEXT VIEW WIDGET
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The GtkSourceView library has a whole separate API documentation, which can be viewed at http://gtksourceview.sourceforge.net. If you need to compile an application that uses this library, you need to add `pkg-config --cflags --libs gtksourceview-1.0` to the compile command. If you need syntax highlighting in a GTK+ application, the GtkSourceView library is one viable option, rather than creating your own widget from scratch.
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