wxWidgets/samples/config/conftest.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        conftest.cpp
// Purpose:     demo of wxConfig and related classes
// Author:      Vadim Zeitlin
// Modified by:
// Created:     03.08.98
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows license
///////////////////////////////////////////////////////////////////////////////

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

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#include "wx/wxprec.h"

#ifndef  WX_PRECOMP
  #include "wx/wx.h"
#endif //precompiled headers

#include "wx/log.h"
#include "wx/config.h"

#ifndef __WXMSW__
    #include "../sample.xpm"
#endif

// ----------------------------------------------------------------------------
// classes
// ----------------------------------------------------------------------------

class MyApp: public wxApp
{
public:
  // implement base class virtuals
  virtual bool OnInit();
  virtual int OnExit();
};

class MyFrame: public wxFrame
{
public:
    MyFrame();
    virtual ~MyFrame();

    // callbacks
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
    void OnDelete(wxCommandEvent& event);

private:
    wxTextCtrl *m_text;
    wxCheckBox *m_check;

    DECLARE_EVENT_TABLE()
};

enum
{
  ConfTest_Quit,
  ConfTest_About,
  ConfTest_Delete
};

// ----------------------------------------------------------------------------
// event tables
// ----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  EVT_MENU(ConfTest_Quit, MyFrame::OnQuit)
  EVT_MENU(ConfTest_About, MyFrame::OnAbout)
  EVT_MENU(ConfTest_Delete, MyFrame::OnDelete)
END_EVENT_TABLE()

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

// ----------------------------------------------------------------------------
// application
// ----------------------------------------------------------------------------

IMPLEMENT_APP(MyApp)

// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit()
{
    if ( !wxApp::OnInit() )
        return false;

    // we're using wxConfig's "create-on-demand" feature: it will create the
    // config object when it's used for the first time. It has a number of
    // advantages compared with explicitly creating our wxConfig:
    //  1) we don't pay for it if we don't use it
    //  2) there is no danger to create it twice

    // application and vendor name are used by wxConfig to construct the name
    // of the config file/registry key and must be set before the first call
    // to Get() if you want to override the default values (the application
    // name is the name of the executable and the vendor name is the same)
    SetVendorName(_T("wxWidgets"));
    SetAppName(_T("conftest")); // not needed, it's the default value

    wxConfigBase *pConfig = wxConfigBase::Get();

    // uncomment this to force writing back of the defaults for all values
    // if they're not present in the config - this can give the user an idea
    // of all possible settings for this program
    pConfig->SetRecordDefaults();

    // or you could also write something like this:
    //  wxFileConfig *pConfig = new wxFileConfig("conftest");
    //  wxConfigBase::Set(pConfig);
    // where you can also specify the file names explicitly if you wish.
    // Of course, calling Set() is optional and you only must do it if
    // you want to later retrieve this pointer with Get().

    // create the main program window
    MyFrame *frame = new MyFrame;
    frame->Show(true);
    SetTopWindow(frame);

    // use our config object...
    if ( pConfig->Read(_T("/Controls/Check"), 1l) != 0 ) {
        wxMessageBox(_T("You can disable this message box by unchecking\n")
                    _T("the checkbox in the main window (of course, a real\n")
                    _T("program would have a checkbox right here but we\n")
                    _T("keep it simple)"), _T("Welcome to wxConfig demo"),
                    wxICON_INFORMATION | wxOK);
    }

    return true;
}

int MyApp::OnExit()
{
    // clean up: Set() returns the active config object as Get() does, but unlike
    // Get() it doesn't try to create one if there is none (definitely not what
    // we want here!)
    delete wxConfigBase::Set((wxConfigBase *) NULL);

    return 0;
}

// ----------------------------------------------------------------------------
// frame
// ----------------------------------------------------------------------------

// main frame ctor
MyFrame::MyFrame()
       : wxFrame((wxFrame *) NULL, wxID_ANY, _T("wxConfig Demo"))
{
    SetIcon(wxICON(sample));

    // menu
    wxMenu *file_menu = new wxMenu;

    file_menu->Append(ConfTest_Delete, _T("&Delete"), _T("Delete config file"));
    file_menu->AppendSeparator();
    file_menu->Append(ConfTest_About, _T("&About\tF1"), _T("About this sample"));
    file_menu->AppendSeparator();
    file_menu->Append(ConfTest_Quit, _T("E&xit\tAlt-X"), _T("Exit the program"));
    wxMenuBar *menu_bar = new wxMenuBar;
    menu_bar->Append(file_menu, _T("&File"));
    SetMenuBar(menu_bar);

#if wxUSE_STATUSBAR
    CreateStatusBar();
#endif // wxUSE_STATUSBAR

    // child controls
    wxPanel *panel = new wxPanel(this);
    (void)new wxStaticText(panel, wxID_ANY, _T("These controls remember their values!"),
                            wxPoint(10, 10), wxSize(300, 20));
    m_text = new wxTextCtrl(panel, wxID_ANY, _T(""), wxPoint(10, 40), wxSize(300, 20));
    m_check = new wxCheckBox(panel, wxID_ANY, _T("show welcome message box at startup"),
                            wxPoint(10, 70), wxSize(300, 20));

    // restore the control's values from the config

    // NB: in this program, the config object is already created at this moment
    // because we had called Get() from MyApp::OnInit(). However, if you later
    // change the code and don't create it before this line, it won't break
    // anything - unlike if you manually create wxConfig object with Create()
    // or in any other way (then you must be sure to create it before using it!).
    wxConfigBase *pConfig = wxConfigBase::Get();

    // we could write Read("/Controls/Text") as well, it's just to show SetPath()
    pConfig->SetPath(_T("/Controls"));

    m_text->SetValue(pConfig->Read(_T("Text"), _T("")));
    m_check->SetValue(pConfig->Read(_T("Check"), 1l) != 0);

    // SetPath() understands ".."
    pConfig->SetPath(_T("../MainFrame"));

    // restore frame position and size
    int x = pConfig->Read(_T("x"), 50),
        y = pConfig->Read(_T("y"), 50),
        w = pConfig->Read(_T("w"), 350),
        h = pConfig->Read(_T("h"), 200);
    Move(x, y);
    SetClientSize(w, h);

    pConfig->SetPath(_T("/"));
    wxString s;
    if ( pConfig->Read(_T("TestValue"), &s) )
    {
        wxLogStatus(this, wxT("TestValue from config is '%s'"), s.c_str());
    }
    else
    {
        wxLogStatus(this, wxT("TestValue not found in the config"));
    }
}

void MyFrame::OnQuit(wxCommandEvent&)
{
    Close(true);
}

void MyFrame::OnAbout(wxCommandEvent&)
{
    wxMessageBox(_T("wxConfig demo\n(c) 1998-2001 Vadim Zeitlin"), _T("About"),
                 wxICON_INFORMATION | wxOK);
}

void MyFrame::OnDelete(wxCommandEvent&)
{
    wxConfigBase *pConfig = wxConfigBase::Get();
    if ( pConfig == NULL )
    {
        wxLogError(_T("No config to delete!"));
        return;
    }

    if ( pConfig->DeleteAll() )
    {
        wxLogMessage(_T("Config file/registry key successfully deleted."));

        delete wxConfigBase::Set(NULL);
        wxConfigBase::DontCreateOnDemand();
    }
    else
    {
        wxLogError(_T("Deleting config file/registry key failed."));
    }
}

MyFrame::~MyFrame()
{
    wxConfigBase *pConfig = wxConfigBase::Get();
    if ( pConfig == NULL )
        return;

    // save the control's values to the config
    pConfig->Write(_T("/Controls/Text"), m_text->GetValue());
    pConfig->Write(_T("/Controls/Check"), m_check->GetValue());

    // save the frame position
    int x, y, w, h;
    GetClientSize(&w, &h);
    GetPosition(&x, &y);
    pConfig->Write(_T("/MainFrame/x"), (long) x);
    pConfig->Write(_T("/MainFrame/y"), (long) y);
    pConfig->Write(_T("/MainFrame/w"), (long) w);
    pConfig->Write(_T("/MainFrame/h"), (long) h);

    pConfig->Write(_T("/TestValue"), wxT("A test value"));
}