app.h

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/////////////////////////////////////////////////////////////////////////////
// Name:        wx/app.h
// Purpose:     wxAppBase class and macros used for declaration of wxApp
//              derived class in the user code
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id: app.h,v 1.129 2005/06/21 09:56:12 VS Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_APP_H_BASE_
#define _WX_APP_H_BASE_

// ----------------------------------------------------------------------------
// headers we have to include here
// ----------------------------------------------------------------------------

#include "wx/event.h"       // for the base class

#if wxUSE_GUI
    #include "wx/window.h"  // for wxTopLevelWindows

    #include "wx/vidmode.h"
#endif // wxUSE_GUI

#include "wx/build.h"
#include "wx/init.h"        // we must declare wxEntry()

class WXDLLIMPEXP_BASE wxAppConsole;
class WXDLLIMPEXP_BASE wxAppTraits;
class WXDLLIMPEXP_BASE wxCmdLineParser;
class WXDLLIMPEXP_BASE wxLog;
class WXDLLIMPEXP_BASE wxMessageOutput;

// wxUSE_EVTLOOP_IN_APP is a temporary hack needed until all ports are updated
// to use wxEventLoop, otherwise we get linking errors on wxMac, it's going to
// disappear a.s.a.p.
#ifdef __WXMAC__
    #define wxUSE_EVTLOOP_IN_APP 0
#else
    #define wxUSE_EVTLOOP_IN_APP 1
    class WXDLLEXPORT wxEventLoop;
#endif

// ----------------------------------------------------------------------------
// typedefs
// ----------------------------------------------------------------------------

// the type of the function used to create a wxApp object on program start up
typedef wxAppConsole* (*wxAppInitializerFunction)();

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

enum
{
    wxPRINT_WINDOWS = 1,
    wxPRINT_POSTSCRIPT = 2
};

// ----------------------------------------------------------------------------
// wxAppConsole: wxApp for non-GUI applications
// ----------------------------------------------------------------------------

class WXDLLIMPEXP_BASE wxAppConsole : public wxEvtHandler
{
public:
    // ctor and dtor
    wxAppConsole();
    virtual ~wxAppConsole();


    // the virtual functions which may/must be overridden in the derived class
    // -----------------------------------------------------------------------

    // This is the very first function called for a newly created wxApp object,
    // it is used by the library to do the global initialization. If, for some
    // reason, you must override it (instead of just overriding OnInit(), as
    // usual, for app-specific initializations), do not forget to call the base
    // class version!
    virtual bool Initialize(int& argc, wxChar **argv);

    // This gives wxCocoa a chance to call OnInit() with a memory pool in place
    virtual bool CallOnInit() { return OnInit(); }

    // Called before OnRun(), this is a good place to do initialization -- if
    // anything fails, return false from here to prevent the program from
    // continuing. The command line is normally parsed here, call the base
    // class OnInit() to do it.
    virtual bool OnInit();

    // this is here only temporary hopefully (FIXME)
    virtual bool OnInitGui() { return true; }

    // This is the replacement for the normal main(): all program work should
    // be done here. When OnRun() returns, the programs starts shutting down.
    virtual int OnRun() = 0;

    // This is only called if OnInit() returned true so it's a good place to do
    // any cleanup matching the initializations done there.
    virtual int OnExit();

    // This is the very last function called on wxApp object before it is
    // destroyed. If you override it (instead of overriding OnExit() as usual)
    // do not forget to call the base class version!
    virtual void CleanUp();

    // Called when a fatal exception occurs, this function should take care not
    // to do anything which might provoke a nested exception! It may be
    // overridden if you wish to react somehow in non-default way (core dump
    // under Unix, application crash under Windows) to fatal program errors,
    // however extreme care should be taken if you don't want this function to
    // crash.
    virtual void OnFatalException() { }

#if wxUSE_EXCEPTIONS
    // function called if an uncaught exception is caught inside the main
    // event loop: it may return true to continue running the event loop or
    // false to stop it (in the latter case it may rethrow the exception as
    // well)
    virtual bool OnExceptionInMainLoop();

    // Called when an unhandled C++ exception occurs inside OnRun(): note that
    // the exception type is lost by now, so if you really want to handle the
    // exception you should override OnRun() and put a try/catch around
    // MainLoop() call there
    virtual void OnUnhandledException() { }
#endif // wxUSE_EXCEPTIONS

    // Called from wxExit() function, should terminate the application a.s.a.p.
    virtual void Exit();


    // application info: name, description, vendor
    // -------------------------------------------

    // NB: all these should be set by the application itself, there are no
    //     reasonable default except for the application name which is taken to
    //     be argv[0]

        // set/get the application name
    wxString GetAppName() const
    {
        return m_appName.empty() ? m_className : m_appName;
    }
    void SetAppName(const wxString& name) { m_appName = name; }

        // set/get the app class name
    wxString GetClassName() const { return m_className; }
    void SetClassName(const wxString& name) { m_className = name; }

        // set/get the vendor name
    const wxString& GetVendorName() const { return m_vendorName; }
    void SetVendorName(const wxString& name) { m_vendorName = name; }


    // cmd line parsing stuff
    // ----------------------

    // all of these methods may be overridden in the derived class to
    // customize the command line parsing (by default only a few standard
    // options are handled)
    //
    // you also need to call wxApp::OnInit() from YourApp::OnInit() for all
    // this to work

#if wxUSE_CMDLINE_PARSER
    // this one is called from OnInit() to add all supported options
    // to the given parser (don't forget to call the base class version if you
    // override it!)
    virtual void OnInitCmdLine(wxCmdLineParser& parser);

    // called after successfully parsing the command line, return true
    // to continue and false to exit (don't forget to call the base class
    // version if you override it!)
    virtual bool OnCmdLineParsed(wxCmdLineParser& parser);

    // called if "--help" option was specified, return true to continue
    // and false to exit
    virtual bool OnCmdLineHelp(wxCmdLineParser& parser);

    // called if incorrect command line options were given, return
    // false to abort and true to continue
    virtual bool OnCmdLineError(wxCmdLineParser& parser);
#endif // wxUSE_CMDLINE_PARSER


    // miscellaneous customization functions
    // -------------------------------------

    // create the app traits object to which we delegate for everything which
    // either should be configurable by the user (then he can change the
    // default behaviour simply by overriding CreateTraits() and returning his
    // own traits object) or which is GUI/console dependent as then wxAppTraits
    // allows us to abstract the differences behind the common fa鏰de
    wxAppTraits *GetTraits();

    // the functions below shouldn't be used now that we have wxAppTraits
#if WXWIN_COMPATIBILITY_2_4

#if wxUSE_LOG
        // override this function to create default log target of arbitrary
        // user-defined class (default implementation creates a wxLogGui
        // object) -- this log object is used by default by all wxLogXXX()
        // functions.
    wxDEPRECATED( virtual wxLog *CreateLogTarget() );
#endif // wxUSE_LOG

        // similar to CreateLogTarget() but for the global wxMessageOutput
        // object
    wxDEPRECATED( virtual wxMessageOutput *CreateMessageOutput() );

#endif // WXWIN_COMPATIBILITY_2_4


    // event processing functions
    // --------------------------

    // this method allows to filter all the events processed by the program, so
    // you should try to return quickly from it to avoid slowing down the
    // program to the crawl
    //
    // return value should be -1 to continue with the normal event processing,
    // or TRUE or FALSE to stop further processing and pretend that the event
    // had been already processed or won't be processed at all, respectively
    virtual int FilterEvent(wxEvent& event);

#if wxUSE_EXCEPTIONS
    // call the specified handler on the given object with the given event
    //
    // this method only exists to allow catching the exceptions thrown by any
    // event handler, it would lead to an extra (useless) virtual function call
    // if the exceptions were not used, so it doesn't even exist in that case
    virtual void HandleEvent(wxEvtHandler *handler,
                             wxEventFunction func,
                             wxEvent& event) const;
#endif // wxUSE_EXCEPTIONS

    // process all events in the wxPendingEvents list -- it is necessary to
    // call this function to process posted events. This happens during each
    // event loop iteration in GUI mode but if there is no main loop, it may be
    // also called directly.
    virtual void ProcessPendingEvents();

    // doesn't do anything in this class, just a hook for GUI wxApp
    virtual bool Yield(bool WXUNUSED(onlyIfNeeded) = false) { return true; }

    // make sure that idle events are sent again
    virtual void WakeUpIdle() { }

    // this is just a convenience: by providing its implementation here we
    // avoid #ifdefs in the code using it
    static bool IsMainLoopRunning() { return false; }


    // debugging support
    // -----------------

    // this function is called when an assert failure occurs, the base class
    // version does the normal processing (i.e. shows the usual assert failure
    // dialog box)
    //
    // the arguments are the place where the assert occurred, the text of the
    // assert itself and the user-specified message
#ifdef __WXDEBUG__
    virtual void OnAssert(const wxChar *file,
                          int line,
                          const wxChar *cond,
                          const wxChar *msg);
#endif // __WXDEBUG__

    // check that the wxBuildOptions object (constructed in the application
    // itself, usually the one from IMPLEMENT_APP() macro) matches the build
    // options of the library and abort if it doesn't
    static bool CheckBuildOptions(const char *optionsSignature,
                                  const char *componentName);
#if WXWIN_COMPATIBILITY_2_4
    wxDEPRECATED( static bool CheckBuildOptions(const wxBuildOptions& buildOptions) );
#endif

    // implementation only from now on
    // -------------------------------

    // helpers for dynamic wxApp construction
    static void SetInitializerFunction(wxAppInitializerFunction fn)
        { ms_appInitFn = fn; }
    static wxAppInitializerFunction GetInitializerFunction()
        { return ms_appInitFn; }

    // accessors for ms_appInstance field (external code might wish to modify
    // it, this is why we provide a setter here as well, but you should really
    // know what you're doing if you call it), wxTheApp is usually used instead
    // of GetInstance()
    static wxAppConsole *GetInstance() { return ms_appInstance; }
    static void SetInstance(wxAppConsole *app) { ms_appInstance = app; }


    // command line arguments (public for backwards compatibility)
    int      argc;
    wxChar **argv;

protected:
    // the function which creates the traits object when GetTraits() needs it
    // for the first time
    virtual wxAppTraits *CreateTraits();


    // function used for dynamic wxApp creation
    static wxAppInitializerFunction ms_appInitFn;

    // the one and only global application object
    static wxAppConsole *ms_appInstance;


    // application info (must be set from the user code)
    wxString m_vendorName,      // vendor name (ACME Inc)
             m_appName,         // app name
             m_className;       // class name

    // the class defining the application behaviour, NULL initially and created
    // by GetTraits() when first needed
    wxAppTraits *m_traits;


    // the application object is a singleton anyhow, there is no sense in
    // copying it
    DECLARE_NO_COPY_CLASS(wxAppConsole)
};

// ----------------------------------------------------------------------------
// wxAppBase: the common part of wxApp implementations for all platforms
// ----------------------------------------------------------------------------

#if wxUSE_GUI

class WXDLLIMPEXP_CORE wxAppBase : public wxAppConsole
{
public:
    wxAppBase();
    virtual ~wxAppBase();

    // the virtual functions which may/must be overridden in the derived class