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



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??????




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