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/* Menus
*
* There are several widgets involved in displaying menus. The
* Gtk::MenuBar widget is a menu bar, which normally appears horizontally
* at the top of an application, but can also be layed out vertically.
* The Gtk::Menu widget is the actual menu that pops up. Both Gtk::MenuBar
* and Gtk::Menu are subclasses of Gtk::MenuShell; a Gtk::MenuShell contains
* menu items (Gtk::MenuItem). Each menu item contains text and/or images
* and can be selected by the user.
*
* There are several kinds of menu item, including plain Gtk::MenuItem,
* Gtk::CheckMenuItem which can be checked/unchecked, Gtk::RadioMenuItem
* which is a check menu item that's in a mutually exclusive group,
* and Gtk::SeparatorMenuItem which is a separator bar.
*
* A Gtk::MenuItem can have a submenu, which is simply a Gtk::Menu to pop
* up when the menu item is selected. Typically, all menu items in a menu bar
* have submenus.
*
* Gtk::Builder provides a higher-level interface for creating menu bars
* and menus; while you can construct menus manually, most people don't
* do that. There's a separate demo for Gtk::Builder.
*/
#include <gtkmm.h>
#include <iostream>
class Example_Menus : public Gtk::Window
{
public:
Example_Menus();
~Example_Menus() override;
protected:
//signal handlers:
void on_button_clicked();
void on_item_activated(const Glib::ustring& item);
Gtk::Menu* create_menu(gint depth);
//Member widgets:
Gtk::Box m_VBox1, m_VBox_Sub1, m_VBox_Sub2;
Gtk::MenuBar m_MenuBar;
Gtk::Separator m_Separator;
Gtk::Button m_Button;
};
//Called by DemoWindow;
Gtk::Window* do_menus()
{
return new Example_Menus();
}
Example_Menus::Example_Menus()
: m_VBox1(Gtk::ORIENTATION_VERTICAL),
m_VBox_Sub1(Gtk::ORIENTATION_VERTICAL, 10),
m_VBox_Sub2(Gtk::ORIENTATION_VERTICAL, 10),
m_Separator(Gtk::ORIENTATION_HORIZONTAL),
m_Button("close")
{
set_title("menus");
set_border_width(0);
add(m_VBox1);
m_VBox1.pack_start(m_MenuBar, Gtk::PACK_SHRINK);
{
//Note:: It's generally easier to use the Gtk::Builder API.
Gtk::MenuItem* pMenuItem = Gtk::make_managed<Gtk::MenuItem>("test\nline2");
pMenuItem->set_submenu( *(create_menu(2)) );
m_MenuBar.append(*pMenuItem);
pMenuItem->show();
pMenuItem = Gtk::make_managed<Gtk::MenuItem>("foo");
pMenuItem->set_submenu( *(create_menu(3)) );
m_MenuBar.append(*pMenuItem);
pMenuItem->show();
pMenuItem = Gtk::make_managed<Gtk::MenuItem>("bar");
pMenuItem->set_submenu( *(create_menu(4)) );
m_MenuBar.append(*pMenuItem);
pMenuItem->show();
}
m_VBox_Sub1.set_border_width(10);
m_VBox1.pack_start(m_VBox_Sub1);
{
auto accel_group = Gtk::AccelGroup::create();
add_accel_group(accel_group);
auto pMenu = create_menu(1);
pMenu->set_accel_group(accel_group);
Gtk::MenuItem* pMenuItem = Gtk::make_managed<Gtk::SeparatorMenuItem>();
pMenu->append(*pMenuItem);
pMenuItem->show();
pMenuItem = Gtk::make_managed<Gtk::MenuItem>("accel");
pMenuItem->set_submenu(*pMenu);
m_MenuBar.append(*pMenuItem);
pMenuItem->show();
pMenuItem = Gtk::make_managed<Gtk::CheckMenuItem>("Accelerate Me");
pMenuItem->add_accelerator("activate", accel_group, GDK_KEY_F1,
Gdk::ModifierType(0), Gtk::ACCEL_VISIBLE);
pMenu->append(*pMenuItem);
pMenuItem->show();
pMenuItem->signal_activate().connect(
sigc::bind(sigc::mem_fun(*this, &Example_Menus::on_item_activated), "F1"));
pMenuItem = Gtk::make_managed<Gtk::CheckMenuItem>("Accelerator Locked");
pMenu->append(*pMenuItem);
pMenuItem->add_accelerator("activate", accel_group, GDK_KEY_F2,
Gdk::ModifierType(0), Gtk::ACCEL_VISIBLE | Gtk::ACCEL_LOCKED);
pMenuItem->show();
pMenuItem->signal_activate().connect(
sigc::bind(sigc::mem_fun(*this, &Example_Menus::on_item_activated), "F2"));
pMenuItem = Gtk::make_managed<Gtk::CheckMenuItem>("Accelerator Frozen");
pMenu->append(*pMenuItem);
pMenuItem->add_accelerator("activate", accel_group, GDK_KEY_F3,
Gdk::ModifierType(0), Gtk::ACCEL_VISIBLE);
pMenuItem->show();
pMenuItem->signal_activate().connect(
sigc::bind(sigc::mem_fun(*this, &Example_Menus::on_item_activated), "F3"));
}
m_VBox1.pack_start(m_Separator, Gtk::PACK_SHRINK);
m_VBox_Sub2.set_border_width(10);
m_VBox1.pack_start(m_VBox_Sub2, Gtk::PACK_SHRINK);
m_Button.signal_clicked().connect(sigc::mem_fun(*this, &Example_Menus::on_button_clicked));
m_VBox_Sub2.pack_start(m_Button);
m_Button.set_can_default(true);
m_Button.grab_default();
show_all();
}
Example_Menus::~Example_Menus()
{
}
Gtk::Menu* Example_Menus::create_menu(gint depth)
{
if (depth < 1)
return nullptr;
Gtk::Menu* pMenu = Gtk::make_managed<Gtk::Menu>();
{
Gtk::RadioMenuItem::Group radiogroup;
for(int i = 0, j = 1; i < 5; i++, j++)
{
char buf[32];
sprintf(buf, "item %2d - %d", depth, j);
Gtk::MenuItem* pMenuItem = Gtk::make_managed<Gtk::RadioMenuItem>(radiogroup, buf);
pMenu->append(*pMenuItem);
pMenuItem->show();
if(i == 3)
pMenuItem->set_sensitive(false);
Gtk::Menu* pSubMenu = create_menu(depth - 1);
if(pSubMenu)
pMenuItem->set_submenu(*pSubMenu);
}
}
return pMenu;
}
void Example_Menus::on_item_activated(const Glib::ustring& item)
{
std::cout << "Item " << item << " was activated" << std::endl;
}
void Example_Menus::on_button_clicked()
{
hide();
}
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