Re: [gtkmm] Problem replacing dynamically a Gtk::MenuElem by another MenuElem

[Ian Michell <ian michell hanzi co uk>]

cedric wrote:

> Hello!
> Here is my new daily problem... ;-)
> preleminary: all of what follows in classes (mostly in the "testX" 
> class, which corresponds to ModuleX.
>
>
> i handle a Gtk::Menubar that contains a "Modules" tab, in which each 
> of my plugins put one button: for exemple, the Deals module puts a 
> menuSelectionButton = new Gtk::Menu_Helpers::MenuElem ("Module 
> Customers",
>                        Gtk::Menu::AccelKey ("<control>1"),
>                        SigC::slot(*this, &test::module_selected) );
>
>
> then, when i click on one one the modules button, i want to replace 
> the cliqued button by this one:
>
> menuSelectedButton = new Gtk::Menu_Helpers::MenuElem("MODULE 
> CUSTOMERS", m_Menu_Customers_Functionnalities); //sub menu.
> Gtk::Menu::MenuList& menulist = 
> m_Menu_Customers_Functionnalities.items();
>
>    menulist.push_back( Gtk::Menu_Helpers::MenuElem("Create a New 
> Customer",
>      SigC::slot(&test::add_customer)));
>    menulist.push_back( Gtk::Menu_Helpers::MenuElem("Delete a Customer",
>      SigC::slot(&test::del_customer)));
>    menulist.push_back( Gtk::Menu_Helpers::MenuElem("Cust others",
>      SigC::slot(&test::on_others)));
>
> so when i click on the button (which is menuSelectionButton at the 
> beginning), i call a change_menu() method, which is also in the test 
> class. I manage to replace the button when i have only one module (so 
> my pointers are correct), but my problem is when i have many modules, 
> i don t know to find the cliqued one. here are some explanations:
>
> menuButtonModulesDispayed_ptr is a ptr on the Modules.items(), so 
> menulist is a Gtk::MenuList of Gtk::MenuItemS which are the modules 
> buttons that i click to select a module. this ptr is accessible to all 
> modules and is never modified.
> each module has his own menuButtonDisplayed ptr, which is a ptr on the 
> currently displayed button. so at the beginning, it points on 
> menuSelectionButton, but it points to menuSelectedButton once we ve 
> cliqued on the button. if later we click on another module's button, 
> this ptr will point again on menuSelectionButton (not implemented yet 
> but it won t be a major problem, i think i can success in it alone ;-) )
>
> so in the While ( !end && XXXXX), i would like to replace XXXXX by 
> something like "*iter != *menuButtonDisplayed", but of course i can 
> compare neither the pointers nor the pointed objects since iter is a 
> Gtk::MenuItem* and menuButtonDisplayed is a Gtk::MenuElem*. i ve tried 
> to compare the "labels" by using Gtk::MenuItem get_submenu() then 
> Gtk::Menu get_label(), but it provoques seg faults... I don t see how 
> to compare a MenuElem to a MenuItem or a Menu! i ve read the api docs 
> and the tutos, but i ve found nothing that could help me :'(
>
> void test::change_menu ()
> {
>     // first we get the list of the Modules buttons
>    Gtk::Menu::MenuList& menulist = 
> menuButtonModulesDispayed_ptr->items();
>
>    // then, we get the button of this module
>    Gtk::Menu_Helpers::MenuList::iterator iter= menulist.begin();
>    while ( (iter != menulist.end()) ) //&& XXXXXXXXXXXXXXXXXXX )
>        { iter++; }
>
>    //we switch to the other button
>    if(menuButtonDisplayed == menuSelectionButton)
>        { menuButtonDisplayed = menuSelectedButton; }
>    else if (menuButtonDisplayed == menuSelectedButton)
>        { menuButtonDisplayed = menuSelectionButton;}
>    else { std::cout << "cust: change ptr error" << std::endl; };
[snip]

>    // to replace the button,
>    iter = menulist.insert(iter, *menuButtonDisplayed);//we add the new
>    iter++;
>    iter = menulist.erase(iter);    //then we delete the actual button
> }
[snip]

Dude not to be funny or anything, one potential cause of a seg fault 
is:  the code above, why in gods name, are
you adding an element to the menulist, then removing it straight 
afterwards? It seems pointless to me!

> thanks to anyone that can help!!!
> regards, cedric
>
>
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I think you are trying to overcomplicate things.. coud you possibly be a 
little clearer than you are being I found your post a little confusing...
[snip]
I don t see how to compare a MenuElem to a MenuItem or a Menu!
[/snip]
As an example: The first thought in my head was: HUH??????