Re: Accelerator

[Chuck Crisler <charles crisler comcast net>]

Accelerators can be confusing. There are 2 ways to do them, one
reasonably well documented, the other not documented at all (AFAIK).
Here is a sample of the undocumented (and really more complicated) way.
HTH
I have removed some redundant code, but this should show you the basic
steps.

Chuck Crisler

class HelloWorld : public Gtk::Window
{
public:
	HelloWorld();
	virtual ~HelloWorld();

protected:
	//Signal Handlers
	virtual void on_button_clicked();
	virtual void on_fileopen_activated();
	virtual void on_fileclose_activated();
...
	//Member widgets.
	Gtk::Button m_button;
	Gtk::VBox m_VBox;
	Gtk::MenuBar m_MainMenu;
	Gtk::Menu m_FileMenu;
	Gtk::Menu m_EditMenu;
	Gtk::MenuItem m_RootMenu1;
	Gtk::MenuItem m_RootMenu2;
	Gtk::MenuItem m_FileOpenItem;
	Gtk::MenuItem m_FileCloseItem;
...
	Glib::RefPtr<Gtk::AccelGroup>	m_oAccelGroup;
};
HelloWorld::HelloWorld() : m_button(Gtk::Stock::OK)
{
	//Set border width for window
	set_border_width( 10 );
	set_title( "Menu Test Window" );

	//	Create the accelerator group for the window.
	m_oAccelGroup = Gtk::AccelGroup::create( );
	//	Add that group to the window so that accelerators can be added.
	add_accel_group( m_oAccelGroup );

	Glib::ustring  strAccelSignal = "activate";
...
	//	Setup the file menu options.
	m_FileOpenItem.add_label("Open", false, Gtk::ALIGN_LEFT,
Gtk::ALIGN_TOP);
	m_FileCloseItem.add_label("Close", false, Gtk::ALIGN_LEFT,
Gtk::ALIGN_TOP);
...
	m_FileExit.signal_activate().connect(sigc::mem_fun(*this,
&HelloWorld::on_fileexit_activated));

	//	Setup the accelerators
	m_FileOpenItem.add_accelerator( strAccelSignal, m_oAccelGroup, GDK_O,
		Gdk::CONTROL_MASK, Gtk::ACCEL_MASK );
	m_FileCloseItem.add_accelerator( strAccelSignal, m_oAccelGroup, GDK_C,
		Gdk::CONTROL_MASK, Gtk::ACCEL_MASK );
...
	m_FileMenu.append(m_FileOpenItem);
	m_FileMenu.append(m_FileCloseItem);
...
	m_RootMenu1.add_label("File", false, Gtk::ALIGN_LEFT, Gtk::ALIGN_TOP);
	m_RootMenu2.add_label("Edit", false, Gtk::ALIGN_LEFT, Gtk::ALIGN_TOP);
	m_RootMenu1.set_submenu(m_FileMenu);
	m_RootMenu2.set_submenu(m_EditMenu);

	m_RootMenu1.show();
	m_RootMenu2.show();
	m_MainMenu.append(m_RootMenu1);
	m_MainMenu.append(m_RootMenu2);
	m_MainMenu.show();
	m_VBox.add(m_MainMenu);
...
	m_Window.set_size_request( 780, 550 );
	m_Window.show();
	m_VBox.add(m_Window);
	m_VBox.show();
	add(m_VBox);

	set_default_size( 800, 600 );

	show_all_children();
	show();
}
...

void HelloWorld::on_fileopen_activated()
{
	std::cout << "Hello World! FileOpen activated." << std::endl;
}

void HelloWorld::on_fileclose_activated()
{
	std::cout << "Hello World! FileClose activated." << std::endl;
}

void HelloWorld::on_fileexit_activated()
{
	std::cout << "Hello World! FileExit activated." << std::endl;
	//	Terminate the application.
	Gtk::Main::quit();
}
...

int main(int argc, char *argv[])
{
	Gtk::Main kit(argc, argv);
	HelloWorld helloworld;
	//Shows the window and returns when it is closed.
	Gtk::Main::run();

	return (0);
}


On Mon, 2009-05-25 at 10:41 -0400, dhk wrote:
> Are accelerators only for menu items?  I've seen a lot of examples with 
> accelerators and the all seem to connect to a menu item.  I've been 
> having a difficult time getting accelerators to work even with the 
> examples.  I think I'm missing something.
> 
> One thing I would like is to just have an accelerator execute a function 
> or a callback.  Maybe if I could just print "Hello World" to the 
> terminal when pressing Alt-F4 would help prove the concept.
> 
> Can someone help?
> 
> Thanks,
> 
> dhk
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