#include <wx/intl.h>

class MyApp : public wxApp
{
public:
    ~MyApp() ;
    // 初始化应用程序
    virtual bool OnInit();
    // 根据用户选择的语言重新创建wxLocale变量
    void SelectLanguage(int lang);
private:
    wxLocale* m_locale; // 'our' locale
};

IMPLEMENT_APP(MyApp)

bool MyApp::OnInit()
{
    wxImage::AddHandler( new wxPNGHandler );
    m_locale = NULL;
    SelectLanguage( wxLANGUAGE_DEFAULT );
    MyFrame *frame = new MyFrame(_("i18n wxWidgets App"));
    frame->Show(true);
    return true;
}

void MyApp::SelectLanguage(int lang)
{
    delete m_locale;
    m_locale = new wxLocale( lang );
    m_locale->AddCatalog( wxT("i18n") );
}

MyApp::~MyApp()
{
    delete m_locale;
}

void MyFrame::SetupStrings()
{
    m_helloString->SetLabel(_("Welcome to International Sample"));
    m_todayString->SetLabel(wxString::Format(_("Now is %s"), wxDateTime::Now().Format().c_str()));
    m_thousandString->SetLabel(wxString::Format(_("12345 divided by 10 is written as %.1f"), 1234.5));
    m_flag->SetBitmap(wxBitmap(_("flag.png"), wxBITMAP_TYPE_PNG ));
    // 创建菜单条
    wxMenu *menuFile = new wxMenu;
    // About菜单应该位于帮助菜单
    wxMenu *helpMenu = new wxMenu;
    helpMenu->Append(wxID_ABOUT, _("&About...\tF1"), wxT("Show about dialog"));
    menuFile->Append(wxID_NEW, _("Change language..."), wxT("Select a new language"));
    menuFile->AppendSeparator();
    menuFile->Append(wxID_EXIT, _("E&xit\tAlt-X"), wxT("Quit this program"));
    wxMenuBar *menuBar = new wxMenuBar();
    menuBar->Append(menuFile, _("&File"));
    menuBar->Append(helpMenu, _("&Help"));
    wxMenuBar* formerMenuBar = GetMenuBar();
    SetMenuBar(menuBar);
    delete formerMenuBar;
    SetStatusText(_("Welcome to wxWidgets!"));
}

void MyFrame::OnChangeLanguage(wxCommandEvent& event)
{
    wxArrayInt languageCodes;
    wxArrayString languageNames;
    languageCodes.Add(wxLANGUAGE_GERMAN);
    languageNames.Add(_("German"));
    languageCodes.Add(wxLANGUAGE_FRENCH);
    languageNames.Add(_("French"));
    languageCodes.Add(wxLANGUAGE_ENGLISH);
    languageNames.Add(_("English"));
    int lang = wxGetSingleChoiceIndex( _("Select language:"), _("Language"), languageNames );
    if ( lang != -1 )
    {
        wxGetApp().SelectLanguage(languageCodes[lang]);
        SetupStrings();
    }
}