gtkmm dynamically add tabs to notebook

[Woody1987]

I have a notebook widget with which I want to dynamically add new tabs to. So far I have:



Gtk::Label tabLabel;
Gtk::Notebook mainNotebook;
Gtk::HBox tabHbox;

for(int i = 0; i < numPortfolios(); i++)
{
tabLabel.set_text(getPortfolio(i).getName());
mainNotebook.append_page(tabHbox, tabLabel);
}


This compiles without any errors or warnings but when it runs, I get:


Gtk-WARNING **: Can't set a parent on widget which has a parent
Gtk-WARNING **: Can't set a parent on widget which has a parent


And then, when I click on a tab I get:


GLib-GObject-WARNING **: /build/buildd/glib2.0-2.26.1/gobject/gsignal.c:2392: instance `0x2240e20' has no handler with id `149'
Gtk-CRITICAL **: IA__gtk_widget_get_visible: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_show: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_get_mapped: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_unrealize: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_unrealize: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_is_toplevel: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_is_toplevel: assertion `GTK_IS_WIDGET (widget)' failed
Gtk-CRITICAL **: IA__gtk_widget_destroy: assertion `GTK_IS_WIDGET (widget)' failedGtk-CRITICAL **: IA__gtk_widget_destroy: assertion `GTK_IS_WIDGET (widget)' failed


Only the last tab has a label, the others are blank. Clicking on other tabs does nothing but show the above errors.

[SledgeHammer_999]

This is just a guess. For each tab you need to create a different instance of Gtk::HBox+Gtk::Label. In your code you try to append the same instances to multiple tabs(containers). This only works for the first iteration of the "for loop". On the next iterations the widgets(tabHBox+tabLabel) already have a parent(the first tab) thats why Gtk refuses to add them in the subsequent tabs-parents.

This MAY solve your problem:


Gtk::Notebook mainNotebook;


for(int i = 0; i < numPortfolios(); i++)
{
Gtk::Label tabLabel;
Gtk::HBox tabHbox;


tabLabel.set_text(getPortfolio(i).getName());
mainNotebook.append_page(tabHbox, tabLabel);
}

The code above creates a new instance of Gtk::HBox+Gtk::Label in each iteration of the for loop.

[Woody1987]

Thanks, but it doesnt work. No tabs are created at all using your code.

I read somewhere that I could use Gtk::manage(). Is this right? If so, how?

[Woody1987]

Solved it:



for(int i = 0; i < numPortfolios(); i++)
{
Label *tabLabel = Gtk::manage(new Label(getPortfolio(i).getName()));
HBox *tabHbox = Gtk::manage(new HBox());
mainNotebook.append_page(*tabHbox, *tabLabel);
}

[Woody1987]

I now have another problem relating to this. After the page is appended, I want to pass the HBox to a function to pack widgets into it.



void createTabs()
{
for(int i = 0; i < numPortfolios(); i++)
{
Label *tabLabel = manage(new Label(getPortfolio(i).getName()));
HBox *tabHbox = manage(new HBox());
mainNotebook.append_page(*tabHbox, *tabLabel);
createTabContent(getPortfolio(i), tabHbox);
}
}

void createTabContent(Portfolio p, HBox *hbox)
{
Button a("test");
hbox->pack_start(a);
}


The above compiles fine, but the button I created does not show.

[Woody1987]

Solved it again.



void createTabContent(Portfolio p, Gtk::HBox *hbox)
{
Button *a = manage(new Button("test"));
hbox->pack_start(*a);
}