wxWidgets：键盘 wxWidgets 示例

    #include "wx/wxprec.h"
    #ifndef WX_PRECOMP
    #include "wx/wx.h"
    #endif
    #ifndef wxHAS_IMAGES_IN_RESOURCES
    #include "../sample.xpm"
    #endif
    
    // IDs for menu items
    enum
    {
    QuitID = wxID_EXIT,
    ClearID = wxID_CLEAR,
    SkipHook = 100,
    SkipDown,
    
    // These IDs must be in the same order as MyFrame::InputKind enum elements.
    IDInputCustom,
    IDInputEntry,
    IDInputText,
    
    #if wxUSE_HOTKEY
    HotKeyRegister,
    HotKeyUnregister,
    #endif // wxUSE_HOTKEY
    
    TestAccelA,
    TestAccelCtrlA,
    TestAccelEsc
    };
    
    // Define a new frame type: this is going to be our main frame
    class MyFrame : public wxFrame
    {
    public:
    MyFrame(const wxString& title);
    
    private:
    // event handlers
    void OnQuit(wxCommandEvent& WXUNUSED(event)) { Close(true); }
    void OnAbout(wxCommandEvent& event);
    
    void OnInputWindowKind(wxCommandEvent& event);
    
    void OnTestAccelA(wxCommandEvent& WXUNUSED(event))
        { m_logText->AppendText("Test accelerator \"A\" used.\n"); }
    void OnTestAccelCtrlA(wxCommandEvent& WXUNUSED(event))
        { m_logText->AppendText("Test accelerator \"Ctrl-A\" used.\n"); }
    void OnTestAccelEsc(wxCommandEvent& WXUNUSED(event))
        { m_logText->AppendText("Test accelerator \"Esc\" used.\n"); }
    
    #if wxUSE_HOTKEY
    void OnRegisterHotKey(wxCommandEvent& WXUNUSED(event))
    {
        if ( RegisterHotKey(0, wxMOD_ALT | wxMOD_SHIFT, WXK_HOME) )
        {
            m_logText->AppendText("Try pressing Alt-Shift-Home anywhere now.\n");
        }
        else
        {
            m_logText->AppendText("Failed to register hot key.\n");
        }
    }
    
    void OnUnregisterHotKey(wxCommandEvent& WXUNUSED(event))
    {
        if ( !UnregisterHotKey(0) )
        {
            m_logText->AppendText("Failed to unregister hot key.\n");
        }
    }
    
    void OnHotkey(wxKeyEvent& event)
    {
        LogEvent("Hot key", event);
    }
    #endif // wxUSE_HOTKEY
    
    void OnClear(wxCommandEvent& WXUNUSED(event)) { m_logText->Clear(); }
    void OnSkipDown(wxCommandEvent& event) { m_skipDown = event.IsChecked(); }
    void OnSkipHook(wxCommandEvent& event) { m_skipHook = event.IsChecked(); }
    
    void OnKeyDown(wxKeyEvent& event)
    {
        LogEvent("KeyDown", event);
        if ( m_skipDown )
            event.Skip();
    }
    void OnKeyUp(wxKeyEvent& event) { LogEvent("KeyUp", event); }
    void OnChar(wxKeyEvent& event) { LogEvent("Char", event); event.Skip(); }
    void OnCharHook(wxKeyEvent& event)
    {
        // The logged messages can be confusing if the input window doesn't
        // have focus so warn about this.
        if ( !m_inputWin->HasFocus() )
        {
            m_logText->SetDefaultStyle(*wxRED);
            m_logText->AppendText("WARNING: focus is not on input window, "
                                  "non-hook events won't be logged.\n");
            m_logText->SetDefaultStyle(wxTextAttr());
        }
    
        LogEvent("Hook", event);
        if ( m_skipHook )
            event.Skip();
    }
    
    void OnPaintInputWin(wxPaintEvent& event);
    
    void LogEvent(const wxString& name, wxKeyEvent& event);
    
    // Set m_inputWin to either a new window of the given kind:
    enum InputKind
    {
        Input_Custom,   // Just a plain wxWindow
        Input_Entry,    // Single-line wxTextCtrl
        Input_Text      // Multi-line wxTextCtrl
    };
    
    void DoCreateInputWindow(InputKind inputKind);
    
    wxTextCtrl *m_logText;
    wxWindow *m_inputWin;
    bool m_skipHook,
         m_skipDown;
    };
    
    
    // Define a new application type, each program should derive a class from wxApp
    class MyApp : public wxApp
    {
    public:
    // 'Main program' equivalent: the program execution "starts" here
    virtual bool OnInit() wxOVERRIDE
    {
        // create the main application window
        new MyFrame("Keyboard wxWidgets App");
    
        // If we returned false here, the application would exit immediately.
        return true;
    }
    };
    
    // Create a new application object: this macro will allow wxWidgets to create
    // the application object during program execution (it's better than using a
    // static object for many reasons) and also declares the accessor function
    // wxGetApp() which will return the reference of the right type (i.e. MyApp and
    // not wxApp)
    wxIMPLEMENT_APP(MyApp);
    
    
    // ============================================================================
    // implementation
    // ============================================================================
    
    // frame constructor
    MyFrame::MyFrame(const wxString& title)
       : wxFrame(NULL, wxID_ANY, title),
         m_inputWin(NULL),
         m_skipHook(true),
         m_skipDown(true)
    {
    SetIcon(wxICON(sample));
    
    // create a menu bar
    wxMenu *menuFile = new wxMenu;
    
    menuFile->Append(ClearID, "&Clear log\tCtrl-L");
    menuFile->AppendSeparator();
    
    menuFile->Append(TestAccelA, "Test accelerator &1\tA");
    menuFile->Append(TestAccelCtrlA, "Test accelerator &2\tCtrl-A");
    menuFile->Append(TestAccelEsc, "Test accelerator &3\tEsc");
    menuFile->AppendSeparator();
    
    menuFile->AppendCheckItem(SkipHook, "Skip CHAR_HOOK event",
        "Not skipping this event disables both KEY_DOWN and CHAR events"
    );
    menuFile->Check(SkipHook, true);
    menuFile->AppendCheckItem(SkipDown, "Skip KEY_DOWN event",
        "Not skipping this event disables CHAR event generation"
    );
    menuFile->Check(SkipDown, true);
    menuFile->AppendSeparator();
    
    menuFile->AppendRadioItem(IDInputCustom, "Use &custom control\tCtrl-C",
        "Use custom wxWindow for input window"
    );
    menuFile->AppendRadioItem(IDInputEntry, "Use text &entry\tCtrl-E",
        "Use single-line wxTextCtrl for input window"
    );
    menuFile->AppendRadioItem(IDInputText, "Use &text control\tCtrl-T",
        "Use multi-line wxTextCtrl for input window"
    );
    menuFile->AppendSeparator();
    
    menuFile->Append(QuitID, "E&xit\tAlt-X", "Quit this program");
    
    // the "About" item should be in the help menu
    wxMenu *menuHelp = new wxMenu;
    menuHelp->Append(wxID_ABOUT, "&About\tF1", "Show about dialog");
    
    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar();
    menuBar->Append(menuFile, "&File");
    
    #if wxUSE_HOTKEY
    wxMenu* menuHotkey = new wxMenu;
    menuHotkey->Append(HotKeyRegister, "&Register hot key");
    menuHotkey->Append(HotKeyUnregister, "&Unregister hot key");
    menuBar->Append(menuHotkey, "Hot&key");
    #endif // wxUSE_HOTKEY
    
    menuBar->Append(menuHelp, "&Help");
    
    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);
    
    DoCreateInputWindow(Input_Custom);
    
    wxTextCtrl *headerText = new wxTextCtrl(this, wxID_ANY, "",
                                            wxDefaultPosition, wxDefaultSize,
                                            wxTE_READONLY);
    headerText->SetValue(
               " event          key     KeyCode mod   UnicodeKey  "
               "  RawKeyCode RawKeyFlags  Position      Repeat");
    
    
    m_logText = new wxTextCtrl(this, wxID_ANY, "",
                               wxDefaultPosition, wxDefaultSize,
                               wxTE_MULTILINE|wxTE_READONLY|wxTE_RICH|wxHSCROLL);
    
    // set monospace font to have output in nice columns
    wxFont font(wxFontInfo(10).Family(wxFONTFAMILY_TELETYPE));
    headerText->SetFont(font);
    m_logText->SetFont(font);
    
    // layout
    wxBoxSizer *sizer = new wxBoxSizer(wxVERTICAL);
    sizer->Add(m_inputWin, wxSizerFlags().Expand());
    sizer->Add(headerText, wxSizerFlags().Expand());
    sizer->Add(m_logText, wxSizerFlags(1).Expand());
    SetSizerAndFit(sizer);
    
    // set size and position on screen
    SetSize(700, 340);
    CentreOnScreen();
    
    // connect menu event handlers
    
    Bind(wxEVT_MENU, &MyFrame::OnQuit, this, QuitID);
    Bind(wxEVT_MENU, &MyFrame::OnAbout, this, wxID_ABOUT);
    Bind(wxEVT_MENU, &MyFrame::OnClear, this, ClearID);
    Bind(wxEVT_MENU, &MyFrame::OnSkipHook, this, SkipHook);
    Bind(wxEVT_MENU, &MyFrame::OnSkipDown, this, SkipDown);
    Bind(wxEVT_MENU, &MyFrame::OnInputWindowKind, this, IDInputCustom, IDInputText);
    Bind(wxEVT_MENU, &MyFrame::OnTestAccelA, this, TestAccelA);
    Bind(wxEVT_MENU, &MyFrame::OnTestAccelCtrlA, this, TestAccelCtrlA);
    Bind(wxEVT_MENU, &MyFrame::OnTestAccelEsc, this, TestAccelEsc);
    #if wxUSE_HOTKEY
    Bind(wxEVT_MENU, &MyFrame::OnRegisterHotKey, this, HotKeyRegister);
    Bind(wxEVT_MENU, &MyFrame::OnUnregisterHotKey, this, HotKeyUnregister);
    Bind(wxEVT_HOTKEY, &MyFrame::OnHotkey, this);
    #endif // wxUSE_HOTKEY
    
    // notice that we don't connect OnCharHook() to the input window, unlike
    // the usual key events this one is propagated upwards
    Bind(wxEVT_CHAR_HOOK, &MyFrame::OnCharHook, this);
    
    // status bar is useful for showing the menu items help strings
    CreateStatusBar();
    
    // and show itself (the frames, unlike simple controls, are not shown when
    // created initially)
    Show(true);
    }
    
    // event handlers
    
    void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
    {
    wxMessageBox("Demonstrates keyboard event processing in wxWidgets\n"
                 "(c) 2002 Vadim Zeitlin\n"
                 "(c) 2008 Marcin Wojdyr",
                 "About wxWidgets Keyboard Sample",
                 wxOK | wxICON_INFORMATION, this);
    }
    
    void MyFrame::DoCreateInputWindow(InputKind inputKind)
    {
    wxWindow* const oldWin = m_inputWin;
    
    switch ( inputKind )
    {
        case Input_Custom:
            m_inputWin = new wxWindow(this, wxID_ANY,
                                      wxDefaultPosition, wxSize(-1, 50),
                                      wxRAISED_BORDER);
            break;
    
        case Input_Entry:
            m_inputWin = new wxTextCtrl(this, wxID_ANY, "Press keys here");
            break;
    
        case Input_Text:
            m_inputWin = new wxTextCtrl(this, wxID_ANY, "Press keys here",
                                        wxDefaultPosition, wxSize(-1, 50),
                                        wxTE_MULTILINE);
            break;
    }
    
    m_inputWin->SetBackgroundColour(*wxBLUE);
    m_inputWin->SetForegroundColour(*wxWHITE);
    
    // connect event handlers for the blue input window
    m_inputWin->Bind(wxEVT_KEY_DOWN, &MyFrame::OnKeyDown, this);
    m_inputWin->Bind(wxEVT_KEY_UP, &MyFrame::OnKeyUp, this);
    m_inputWin->Bind(wxEVT_CHAR, &MyFrame::OnChar, this);
    
    if ( inputKind == Input_Custom )
    {
        m_inputWin->Bind(wxEVT_PAINT, &MyFrame::OnPaintInputWin, this);
    }
    
    if ( oldWin )
    {
        GetSizer()->Replace(oldWin, m_inputWin);
        Layout();
        delete oldWin;
    }
    }
    
    void MyFrame::OnInputWindowKind(wxCommandEvent& event)
    {
    DoCreateInputWindow(
        static_cast<InputKind>(event.GetId() - IDInputCustom)
    );
    }
    
    void MyFrame::OnPaintInputWin(wxPaintEvent& WXUNUSED(event))
    {
    wxPaintDC dc(m_inputWin);
    dc.SetTextForeground(*wxWHITE);
    wxFont font(*wxSWISS_FONT);
    font.SetWeight(wxFONTWEIGHT_BOLD);
    font.SetPointSize(font.GetPointSize() + 2);
    dc.SetFont(font);
    
    dc.DrawLabel("Press keys here",
                 m_inputWin->GetClientRect(), wxALIGN_CENTER);
    }
    
    
    // helper function that returns textual description of wx virtual keycode
    const char* GetVirtualKeyCodeName(int keycode)
    {
    switch ( keycode )
    {
    #define WXK_(x) \
        case WXK_##x: return #x;
    
        WXK_(BACK)
        WXK_(TAB)
        WXK_(RETURN)
        WXK_(ESCAPE)
        WXK_(SPACE)
        WXK_(DELETE)
        WXK_(START)
        WXK_(LBUTTON)
        WXK_(RBUTTON)
        WXK_(CANCEL)
        WXK_(MBUTTON)
        WXK_(CLEAR)
        WXK_(SHIFT)
        WXK_(ALT)
        WXK_(CONTROL)
        WXK_(MENU)
        WXK_(PAUSE)
        WXK_(CAPITAL)
        WXK_(END)
        WXK_(HOME)
        WXK_(LEFT)
        WXK_(UP)
        WXK_(RIGHT)
        WXK_(DOWN)
        WXK_(SELECT)
        WXK_(PRINT)
        WXK_(EXECUTE)
        WXK_(SNAPSHOT)
        WXK_(INSERT)
        WXK_(HELP)
        WXK_(NUMPAD0)
        WXK_(NUMPAD1)
        WXK_(NUMPAD2)
        WXK_(NUMPAD3)
        WXK_(NUMPAD4)
        WXK_(NUMPAD5)
        WXK_(NUMPAD6)
        WXK_(NUMPAD7)
        WXK_(NUMPAD8)
        WXK_(NUMPAD9)
        WXK_(MULTIPLY)
        WXK_(ADD)
        WXK_(SEPARATOR)
        WXK_(SUBTRACT)
        WXK_(DECIMAL)
        WXK_(DIVIDE)
        WXK_(F1)
        WXK_(F2)
        WXK_(F3)
        WXK_(F4)
        WXK_(F5)
        WXK_(F6)
        WXK_(F7)
        WXK_(F8)
        WXK_(F9)
        WXK_(F10)
        WXK_(F11)
        WXK_(F12)
        WXK_(F13)
        WXK_(F14)
        WXK_(F15)
        WXK_(F16)
        WXK_(F17)
        WXK_(F18)
        WXK_(F19)
        WXK_(F20)
        WXK_(F21)
        WXK_(F22)
        WXK_(F23)
        WXK_(F24)
        WXK_(NUMLOCK)
        WXK_(SCROLL)
        WXK_(PAGEUP)
        WXK_(PAGEDOWN)
        WXK_(NUMPAD_SPACE)
        WXK_(NUMPAD_TAB)
        WXK_(NUMPAD_ENTER)
        WXK_(NUMPAD_F1)
        WXK_(NUMPAD_F2)
        WXK_(NUMPAD_F3)
        WXK_(NUMPAD_F4)
        WXK_(NUMPAD_HOME)
        WXK_(NUMPAD_LEFT)
        WXK_(NUMPAD_UP)
        WXK_(NUMPAD_RIGHT)
        WXK_(NUMPAD_DOWN)
        WXK_(NUMPAD_PAGEUP)
        WXK_(NUMPAD_PAGEDOWN)
        WXK_(NUMPAD_END)
        WXK_(NUMPAD_BEGIN)
        WXK_(NUMPAD_INSERT)
        WXK_(NUMPAD_DELETE)
        WXK_(NUMPAD_EQUAL)
        WXK_(NUMPAD_MULTIPLY)
        WXK_(NUMPAD_ADD)
        WXK_(NUMPAD_SEPARATOR)
        WXK_(NUMPAD_SUBTRACT)
        WXK_(NUMPAD_DECIMAL)
        WXK_(NUMPAD_DIVIDE)
    
        WXK_(WINDOWS_LEFT)
        WXK_(WINDOWS_RIGHT)
    #ifdef __WXOSX__
        WXK_(RAW_CONTROL)
    #endif
        WXK_(BROWSER_BACK)
        WXK_(BROWSER_FORWARD)
        WXK_(BROWSER_REFRESH)
        WXK_(BROWSER_STOP)
        WXK_(BROWSER_SEARCH)
        WXK_(BROWSER_FAVORITES)
        WXK_(BROWSER_HOME)
        WXK_(VOLUME_MUTE)
        WXK_(VOLUME_DOWN)
        WXK_(VOLUME_UP)
        WXK_(MEDIA_NEXT_TRACK)
        WXK_(MEDIA_PREV_TRACK)
        WXK_(MEDIA_STOP)
        WXK_(MEDIA_PLAY_PAUSE)
        WXK_(LAUNCH_MAIL)
        WXK_(LAUNCH_APP1)
        WXK_(LAUNCH_APP2)
    #undef WXK_
    
    default:
        return NULL;
    }
    }
    
    // helper function that returns textual description of key in the event
    wxString GetKeyName(const wxKeyEvent &event)
    {
    int keycode = event.GetKeyCode();
    const char* virt = GetVirtualKeyCodeName(keycode);
    if ( virt )
        return virt;
    if ( keycode > 0 && keycode < 32 )
        return wxString::Format("Ctrl-%c", (unsigned char)('A' + keycode - 1));
    if ( keycode >= 32 && keycode < 128 )
        return wxString::Format("'%c'", (unsigned char)keycode);
    
    #if wxUSE_UNICODE
    int uc = event.GetUnicodeKey();
    if ( uc != WXK_NONE )
        return wxString::Format("'%c'", uc);
    #endif
    
    return "unknown";
    }
    
    
    void MyFrame::LogEvent(const wxString& name, wxKeyEvent& event)
    {
    wxString msg;
    // event  key_name  KeyCode  modifiers  Unicode  raw_code raw_flags pos
    msg.Printf("%7s %15s %5d   %c%c%c%c"
    #if wxUSE_UNICODE
                   "%5d (U+%04x)"
    #else
                   "    none   "
    #endif
    #ifdef wxHAS_RAW_KEY_CODES
                   "  %7lu    0x%08lx"
    #else
                   "  not-set    not-set"
    #endif
                   "  (%5d,%5d)"
                   "  %s"
                   "\n",
               name,
               GetKeyName(event),
               event.GetKeyCode(),
               event.ControlDown() ? 'C' : '-',
               event.AltDown()     ? 'A' : '-',
               event.ShiftDown()   ? 'S' : '-',
               event.MetaDown()    ? 'M' : '-'
    #if wxUSE_UNICODE
               , event.GetUnicodeKey()
               , event.GetUnicodeKey()
    #endif
    #ifdef wxHAS_RAW_KEY_CODES
               , (unsigned long) event.GetRawKeyCode()
               , (unsigned long) event.GetRawKeyFlags()
    #endif
               , event.GetX()
               , event.GetY()
               , event.IsAutoRepeat() ? "Yes" : "No"
               );
    
    m_logText->AppendText(msg);
    }