Adding a tab in a GTK-Notebook when using Glade

Question

I have written a C-program and am studying GTK and Glade to build a GUI and now I am stuck for at least two days:

I need a notebook with one tab. In this tab is a button, if clicked a new tab is added.

I found: 'gtk_notebook_append_page(notebook_pointer, tab_content_pointer, label)' but whatever I do it doesn't work. Especially I am not sure what to take as tab_content. I get one out of three error messages: it complains that it is top level and can't get a parent or it has already a parent or the new tab just can't be inserted.

Does anyone know what to take in glade to be used as tab_content? Or knows an example where I could learn that?

Or do I need to dump glade and write everything in C-code? I found examples for that.

Thanks for your help.

Answer 1

Draw a notebook with Glade. If you right - click on the tab you want to change, you can delete its contents. (A tab can contain a single widget, though you can put in a HBox or a Grid to combine several).

Once deleted, you can insert any other widget there. Here is an example:

A window with a notebook. First tab contents deleted

Inserted a Box, but by default it's vertical, so...

I changed the property to horizontal

I inserted an image widget in the first space, and a checkbutton in the second. (Change the computer's theme to make is a little more visible.

If you want to add pages from you C-code you can do that too, just get a reference to the notebook, and then modify the tab contents.

As a note, I'd recommend looking at using Python as manager of your GUI. Managing GUIs in Gtk and C - using Glade or not - is tedious. There are several example on the net about how to do that:

-Using Python GTK GUI front end with C++ backend

-How to use GTK+ 3 in Python to manage your whole application

This code adds a new tab perfectly here:

notebook = GTK_WIDGET (gtk_builder_get_object (builder, "notebook1"));
    if (!notebook) {
        g_critical ("Widget \"%s\" is missing in file %s.",
        TOP_WINDOW, "notebook1");
    }
tab_label = gtk_label_new ("New page's tab");
page_contents = gtk_label_new ("New page's contents");

gtk_notebook_append_page(notebook, page_contents, tab_label);

Note that you have to put "notebook1" in the ID field of the notebook's widget in Glade.