A little black magic... When the C++ object (for a window or

[wxWidgets.git] / samples / keyboard / keyboard.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        keyboard.cpp
// Purpose:     Keyboard wxWindows sample
// Author:      Vadim Zeitlin
// Modified by:
// Created:     07.04.02
// RCS-ID:      $Id$
// Copyright:   (c) 2002 Vadim Zeitlin
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWindows headers)
#ifndef WX_PRECOMP
    #include "wx/wx.h"
#endif

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
    virtual bool OnInit();
};

// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
    // ctor(s)
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
            long style = wxDEFAULT_FRAME_STYLE);

    ~MyFrame() { delete m_logTarget; }

    // event handlers (these functions should _not_ be virtual)
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
    void OnClear(wxCommandEvent& event);
    void OnSkip(wxCommandEvent& event);
    void OnShowRaw(wxCommandEvent& event);

    void OnSize(wxSizeEvent& event);

private:
    wxLog *m_logTarget;

    class TextWindow *m_winText;
    wxListBox *m_lboxLog;

    // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
};

// A log target which just redirects the messages to a listbox
class LboxLogger : public wxLog
{
public:
    LboxLogger(wxListBox *lbox, wxLog *logOld)
    {
        m_lbox = lbox;
        //m_lbox->Disable(); -- looks ugly under MSW
        m_logOld = logOld;
    }

    virtual ~LboxLogger()
    {
        wxLog::SetActiveTarget(m_logOld);
    }

private:
    // implement sink functions
    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t)
    {
        // don't put trace messages into listbox or we can get into infinite
        // recursion
        if ( level == wxLOG_Trace )
        {
            if ( m_logOld )
            {
                // cast is needed to call protected method
                ((LboxLogger *)m_logOld)->DoLog(level, szString, t);
            }
        }
        else
        {
            wxLog::DoLog(level, szString, t);
        }
    }

    virtual void DoLogString(const wxChar *szString, time_t t)
    {
        wxString msg;
        TimeStamp(&msg);
        msg += szString;

        #ifdef __WXUNIVERSAL__
            m_lbox->AppendAndEnsureVisible(msg);
        #else // other ports don't have this method yet
            m_lbox->Append(msg);
            m_lbox->SetFirstItem(m_lbox->GetCount() - 1);
        #endif
    }

    // the control we use
    wxListBox *m_lbox;

    // the old log target
    wxLog *m_logOld;
};

class TextWindow : public wxWindow
{
public:
    TextWindow(wxWindow *parent)
        : wxWindow(parent, -1, wxDefaultPosition, wxDefaultSize,
                   wxRAISED_BORDER)
    {
        m_skip = TRUE;
        m_showRaw = FALSE;

        SetBackgroundColour(*wxBLUE);
    }

    void SetSkip(bool skip) { m_skip = skip; }
    void SetShowRaw(bool show) { m_showRaw = show; }

protected:
    void OnKeyDown(wxKeyEvent& event) { LogEvent(_T("Key down"), event); }
    void OnKeyUp(wxKeyEvent& event) { LogEvent(_T("Key up"), event); }
    void OnChar(wxKeyEvent& event) { LogEvent(_T("Char"), event); }

    void OnPaint(wxPaintEvent& event)
    {
        wxPaintDC dc(this);
        dc.SetTextForeground(*wxWHITE);
        dc.DrawLabel(_T("Press keys here"), GetClientRect(), wxALIGN_CENTER);
    }

private:
    static inline wxChar GetChar(bool on, wxChar c) { return on ? c : _T('-'); }

    void LogEvent(const wxChar *name, wxKeyEvent& event);

    bool m_skip;
    bool m_showRaw;

    DECLARE_EVENT_TABLE()
};

BEGIN_EVENT_TABLE(TextWindow, wxWindow)
    EVT_KEY_DOWN(TextWindow::OnKeyDown)
    EVT_KEY_UP(TextWindow::OnKeyUp)
    EVT_CHAR(TextWindow::OnChar)

    EVT_PAINT(TextWindow::OnPaint)
END_EVENT_TABLE()

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// IDs for the controls and the menu commands
enum
{
    // menu items
    Keyboard_Quit = 1,

    Keyboard_Clear,
    Keyboard_Skip,
    Keyboard_ShowRaw,

    // it is important for the id corresponding to the "About" command to have
    // this standard value as otherwise it won't be handled properly under Mac
    // (where it is special and put into the "Apple" menu)
    Keyboard_About = wxID_ABOUT
};

// ----------------------------------------------------------------------------
// event tables and other macros for wxWindows
// ----------------------------------------------------------------------------

// the event tables connect the wxWindows events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(Keyboard_Quit,  MyFrame::OnQuit)
    EVT_MENU(Keyboard_About, MyFrame::OnAbout)

    EVT_MENU(Keyboard_Clear, MyFrame::OnClear)
    EVT_MENU(Keyboard_Skip, MyFrame::OnSkip)
    EVT_MENU(Keyboard_ShowRaw, MyFrame::OnShowRaw)

    EVT_SIZE(MyFrame::OnSize)
END_EVENT_TABLE()

// Create a new application object: this macro will allow wxWindows 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)
IMPLEMENT_APP(MyApp)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------

// 'Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
    // create the main application window
    MyFrame *frame = new MyFrame(_T("Keyboard wxWindows App"),
                                 wxPoint(50, 50), wxSize(450, 340));

    // and show it (the frames, unlike simple controls, are not shown when
    // created initially)
    frame->Show(TRUE);

    // success: wxApp::OnRun() will be called which will enter the main message
    // loop and the application will run. If we returned FALSE here, the
    // application would exit immediately.
    return TRUE;
}

// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------

// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size, long style)
       : wxFrame(NULL, -1, title, pos, size, style),
         m_winText(NULL)
{
#if wxUSE_MENUS
    // create a menu bar
    wxMenu *menuFile = new wxMenu;
    menuFile->Append(Keyboard_Clear, _T("&Clear log\tCtrl-L"));
    menuFile->AppendSeparator();
    menuFile->Append(Keyboard_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));

    wxMenu *menuKeys = new wxMenu;
    menuKeys->AppendCheckItem(Keyboard_ShowRaw, _T("Show &raw keys\tCtrl-R"));
    menuKeys->AppendSeparator();
    menuKeys->AppendCheckItem(Keyboard_Skip, _T("&Skip key down\tCtrl-S"));

    // the "About" item should be in the help menu
    wxMenu *menuHelp = new wxMenu;
    menuHelp->Append(Keyboard_About, _T("&About...\tF1"), _T("Show about dialog"));

    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar();
    menuBar->Append(menuFile, _T("&File"));
    menuBar->Append(menuKeys, _T("&Keys"));
    menuBar->Append(menuHelp, _T("&Help"));

    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);

    menuBar->Check(Keyboard_Skip, TRUE);

#ifndef wxHAS_RAW_KEY_CODES
    menuBar->Enable(Keyboard_ShowRaw, FALSE);
#endif // !wxHAS_RAW_KEY_CODES
#endif // wxUSE_MENUS

    m_winText = new TextWindow(this);
    m_lboxLog = new wxListBox(this, -1);

    m_logTarget = new LboxLogger(m_lboxLog, wxLog::GetActiveTarget());
    wxLog::SetActiveTarget(m_logTarget);

#if wxUSE_STATUSBAR
    // create a status bar just for fun (by default with 1 pane only)
    CreateStatusBar(2);
    SetStatusText(_T("Welcome to wxWindows!"));
#endif // wxUSE_STATUSBAR
}

// event handlers

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    // TRUE is to force the frame to close
    Close(TRUE);
}

void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
    wxString msg = _T("Demonstrates keyboard event processing in wxWindows\n")