アプリ終了の確認 - Siv3D/Reference-JP GitHub Wiki

# include <Siv3D.hpp>

void Main()
{
    Graphics::SetBackground(Color(160, 200, 100));

    GUI gui(GUIStyle::Default);
    gui.setTitle(L"タイトル");
    gui.addln(GUIText::Create(L"終了しますか？"));
    gui.add(L"yes", GUIButton::Create(L"はい"));
    gui.add(L"no", GUIButton::Create(L"いいえ"));
    gui.setCenter(Window::Center());
    gui.hide();

    System::SetExitEvent(WindowEvent::Manual);

    while (System::Update())
    {
        if ((System::GetPreviousEvent() & WindowEvent::CloseButton)
            || (System::GetPreviousEvent() & WindowEvent::EscapeKey))
        {
            gui.show();
        }

        if (gui.button(L"yes").pushed)
        {
            System::Exit();
        }
        else if (gui.button(L"no").pushed)
        {
            gui.hide();
        }
    }
}