Re: [gtkmm] some easy questions from a beginner

[Carl Nygard <cjnygard fast net>]

On Thu, 2002-07-11 at 11:42, Daniel Perez Alcazar wrote:
> 
> Hello,
> 
> I've recently begin to work with Gtkmm, and I've had some problems.
> Sure you have solved these problems before. I've read the examples 
> of gtkmm and I've not found anything related, so I'm asking you now.
> 
> I have 2 main problems :
> 
> 	1- I can't do a "pack_start" with any thing different to a Widget object.
> 	I want to do a pack_start(menu,false,false,0), where "menu" is an
> 	object derived from the MenuBar class.
> 
> 	2- The first times I wrote  gtkmm code, I always wrote 
> 	derived classes from Gtkmm classes and I declared an instance of
> 	them and after this, I always did a "menu.show()", being "menu" the
> 	derived class. I do that because "menu" has inherited all the methods
> 	of the mother class (which is intended to be a gtkmm widget). But 
> 	the compiler gives me an error: <<request for member "show" in
>  	"menu"	, which is of non-aggregate type "nsMenu ()()">>. After some
> 	investigation, I saw that all of the examples call the "show" method 
> 	inside the class itself, but I don't understand why my approach is not
> 	correct.
> 
> Here you have all the code. Ah! I'm sorry if sometimes it's difficult to
> understand my written English!
> 
> Thank you very much,
> 
> Dani P.
> 
> ////////////////////// nsMain.cpp ////////////////////////////////
> #include <gtk--/main.h>
> #include <gtk--/window.h>
> #include <gtk--/box.h>
> #include "nsMenu.h"
> 
> int main (int argc, char *argv[])
> {
> 	Gtk::Main start(argc,argv);
> 	Gtk::Window window(GTK_WINDOW_TOPLEVEL);
> 	
> 	nsMenu menu();

You're declaring a function named menu taking no arguments and returning
an object of type nsMenu.  Drop the () and you should be good.  Compiler
is expecting use of 'menu' to be a function.

> 	//menu.show(); <----- This is what I meant in 2nd problem
> 	
> 	Gtk::VBox main_packing_box(FALSE,0);
> 	main_packing_box.pack_start(menu,false,0);
> 	main_packing_box.show();
> 	
> 	
> 	window.set_title("NetScout");
> 	window.set_policy(false,false,true);
> 	window.add(main_packing_box);
> 	window.show();
> 
> 	
> 	start.run();
> 
> 	return(0);
> }
> /////////////////////// End nsMain ///////////////////////////
> 
> --------------------------------
> 
> /////////////////////// nsMenu.cpp //////////////////////////
> #include "nsMenu.h"
> 
> nsMenu::nsMenu()
> {
> 	
> 	Gtk::Menu file_menu();
> 		MenuList& file_menu_list=file_menu.items();
> 		file_menu_list.push_back("Open");
> 		file_menu_list.push_back("Save");
> 		file_menu.show();
> 		
> 	MenuList& menu_bar_list=items();
> 	menu_bar_list.push_back(MenuElem("File",NULL,file_menu));
> 	show(); <--- This is what I did to solve the 2nd  issue.
> }
> 
> ////////////////////////// End nsMenu /////////////////////////
> 
> ---------------------------------
> 
> /////////////////////////// nsMenu.h ////////////////////////////
> 
> #include <gtk--/menubar.h>
> #include <gtk--/menu.h>
> 
> class nsMenu : public Gtk::MenuBar
> {
> 	nsMenu::nsMenu();
> };
> 
> 
> //////////////////////// End nsMenu.h ///////////////////////
> 
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