interface/wx/app.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        app.h
   3 // Purpose:     interface of wxApp
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10 /**
  11     @class wxAppConsole
  12
  13     This class is essential for writing console-only or hybrid apps without
  14     having to define @c wxUSE_GUI=0.
  15
  16     It is used to:
  17     @li set and get application-wide properties (see wxAppConsole::CreateTraits
  18         and wxAppConsole::SetXXX functions)
  19     @li implement the windowing system message or event loop: events in fact are
  20         supported even in console-mode applications (see wxAppConsole::HandleEvent
  21         and wxAppConsole::ProcessPendingEvents);
  22     @li initiate application processing via wxApp::OnInit;
  23     @li allow default processing of events not handled by other
  24         objects in the application (see wxAppConsole::FilterEvent)
  25     @li implement Apple-specific event handlers (see wxAppConsole::MacXXX functions)
  26
  27     You should use the macro IMPLEMENT_APP(appClass) in your application
  28     implementation file to tell wxWidgets how to create an instance of your
  29     application class.
  30
  31     Use DECLARE_APP(appClass) in a header file if you want the ::wxGetApp() function
  32     (which returns a reference to your application object) to be visible to other
  33     files.
  34
  35     @library{wxbase}
  36     @category{appmanagement}
  37
  38     @see @ref overview_app, wxApp, wxAppTraits, wxEventLoop
  39 */
  40 class wxAppConsole : public wxEvtHandler
  41 {
  42 protected:
  43     /**
  44         Creates the wxAppTraits object when GetTraits() needs it for the first time.
  45
  46         @see wxAppTraits
  47     */
  48     virtual wxAppTraits* CreateTraits();
  49
  50 public:
  51
  52     /**
  53         Destructor.
  54     */
  55     virtual ~wxAppConsole();
  56
  57     /**
  58         Dispatches the next event in the windowing system event queue.
  59         Blocks until an event appears if there are none currently
  60         (use Pending() if this is not wanted).
  61
  62         This can be used for programming event loops, e.g.
  63
  64         @code
  65         while (app.Pending())
  66             Dispatch();
  67         @endcode
  68
  69         @return @false if the event loop should stop and @true otherwise.
  70
  71         @see Pending()
  72     */
  73     virtual bool Dispatch();
  74
  75     /**
  76         Call this to explicitly exit the main message (event) loop.
  77         You should normally exit the main loop (and the application) by deleting
  78         the top window.
  79     */
  80     virtual void ExitMainLoop();
  81
  82     /**
  83         This function is called before processing any event and allows the application
  84         to preempt the processing of some events.
  85
  86         If this method returns -1 the event is processed normally, otherwise either
  87         @true or @false should be returned and the event processing stops immediately
  88         considering that the event had been already processed (for the former return
  89         value) or that it is not going to be processed at all (for the latter one).
  90     */
  91     virtual int FilterEvent(wxEvent& event);
  92
  93     /**
  94         Returns the user-readable application name.
  95
  96         The difference between this string and the one returned by GetAppName()
  97         is that this one is meant to be shown to the user and so should be used
  98         for the window titles, page headers and so on while the other one
  99         should be only used internally, e.g. for the file names or
 100         configuration file keys. By default, returns the application name as
 101         returned by GetAppName() capitalized using wxString::Capitalize().
 102
 103         @since 2.9.0
 104     */
 105     wxString GetAppDisplayName() const;
 106
 107     /**
 108         Returns the application name.
 109
 110         @remarks wxWidgets sets this to a reasonable default before calling
 111                  OnInit(), but the application can reset it at will.
 112
 113         @see GetAppDisplayName()
 114     */
 115     wxString GetAppName() const;
 116
 117     /**
 118         Gets the class name of the application. The class name may be used in a
 119         platform specific manner to refer to the application.
 120
 121         @see SetClassName()
 122     */
 123     wxString GetClassName() const;
 124
 125     /**
 126         Returns the one and only global application object.
 127         Usually wxTheApp is used instead.
 128
 129         @see SetInstance()
 130     */
 131     static wxAppConsole* GetInstance();
 132
 133     /**
 134         Returns a pointer to the wxAppTraits object for the application.
 135         If you want to customize the wxAppTraits object, you must override the
 136         CreateTraits() function.
 137     */
 138     wxAppTraits* GetTraits();
 139
 140     /**
 141         Returns the user-readable vendor name. The difference between this string
 142         and the one returned by GetVendorName() is that this one is meant to be shown
 143         to the user and so should be used for the window titles, page headers and so on
 144         while the other one should be only used internally, e.g. for the file names or
 145         configuration file keys.
 146
 147         By default, returns the same string as GetVendorName().
 148
 149         @since 2.9.0
 150     */
 151     const wxString& GetVendorDisplayName() const;
 152
 153     /**
 154         Returns the application's vendor name.
 155     */
 156     const wxString& GetVendorName() const;
 157
 158     /**
 159         This function simply invokes the given method @a func of the specified
 160         event handler @a handler with the @a event as parameter. It exists solely
 161         to allow to catch the C++ exceptions which could be thrown by all event
 162         handlers in the application in one place: if you want to do this, override
 163         this function in your wxApp-derived class and add try/catch clause(s) to it.
 164     */
 165     virtual void HandleEvent(wxEvtHandler* handler,
 166                              wxEventFunction func,
 167                              wxEvent& event) const;
 168
 169     /**
 170         Returns @true if the main event loop is currently running, i.e. if the
 171         application is inside OnRun().
 172
 173         This can be useful to test whether events can be dispatched. For example,
 174         if this function returns @false, non-blocking sockets cannot be used because
 175         the events from them would never be processed.
 176     */
 177     static bool IsMainLoopRunning();
 178
 179     /**
 180         Returns @true if called from inside Yield().
 181     */
 182     bool IsYielding() const;
 183
 184     /**
 185         Process all pending events; it is necessary to call this function to
 186         process posted events.
 187
 188         This happens during each event loop iteration in GUI mode but if there is
 189         no main loop, it may be also called directly.
 190     */
 191     virtual void ProcessPendingEvents();
 192
 193     /**
 194         Called in response of an "open-application" Apple event.
 195         Override this to create a new document in your app.
 196
 197         @onlyfor{wxmac}
 198     */
 199     virtual void MacNewFile();
 200
 201     /**
 202         Called in response of an "open-document" Apple event.
 203
 204         You need to override this method in order to open a document file after the
 205         user double clicked on it or if the document file was dropped on either the
 206         running application or the application icon in Finder.
 207
 208         @onlyfor{wxmac}
 209     */
 210     virtual void MacOpenFile(const wxString& fileName);
 211
 212     /**
 213         Called in response of a "get-url" Apple event.
 214
 215         @onlyfor{wxmac}
 216     */
 217     virtual void MacOpenURL(const wxString& url);
 218
 219     /**
 220         Called in response of a "print-document" Apple event.
 221
 222         @onlyfor{wxmac}
 223     */
 224     virtual void MacPrintFile(const wxString& fileName);
 225
 226     /**
 227         Called in response of a "reopen-application" Apple event.
 228
 229         @onlyfor{wxmac}
 230     */
 231     virtual void MacReopenApp();
 232
 233     /**
 234         Called by wxWidgets on creation of the application. Override this if you wish
 235         to provide your own (environment-dependent) main loop.
 236
 237         @return 0 under X, and the wParam of the WM_QUIT message under Windows.
 238     */
 239     virtual int MainLoop();
 240
 241     /**
 242         This function is called when an assert failure occurs, i.e. the condition
 243         specified in wxASSERT() macro evaluated to @false.
 244
 245         It is only called in debug mode (when @c __WXDEBUG__ is defined) as
 246         asserts are not left in the release code at all.
 247         The base class version shows the default assert failure dialog box proposing to
 248         the user to stop the program, continue or ignore all subsequent asserts.
 249
 250         @param file
 251             the name of the source file where the assert occurred
 252         @param line
 253             the line number in this file where the assert occurred
 254         @param func
 255             the name of the function where the assert occurred, may be
 256             empty if the compiler doesn't support C99 __FUNCTION__
 257         @param cond
 258             the condition of the failed assert in text form
 259         @param msg
 260             the message specified as argument to wxASSERT_MSG or wxFAIL_MSG, will
 261             be @NULL if just wxASSERT or wxFAIL was used
 262     */
 263     virtual void OnAssertFailure(const wxChar *file,
 264                                  int line,
 265                                  const wxChar *func,
 266                                  const wxChar *cond,
 267                                  const wxChar *msg);
 268
 269     /**
 270         Called when command line parsing fails (i.e. an incorrect command line option
 271         was specified by the user). The default behaviour is to show the program usage
 272         text and abort the program.
 273
 274         Return @true to continue normal execution or @false to return
 275         @false from OnInit() thus terminating the program.
 276
 277         @see OnInitCmdLine()
 278     */
 279     virtual bool OnCmdLineError(wxCmdLineParser& parser);
 280
 281     /**
 282         Called when the help option (@c --help) was specified on the command line.
 283         The default behaviour is to show the program usage text and abort the program.
 284
 285         Return @true to continue normal execution or @false to return
 286         @false from OnInit() thus terminating the program.
 287
 288         @see OnInitCmdLine()
 289     */
 290     virtual bool OnCmdLineHelp(wxCmdLineParser& parser);
 291
 292     /**
 293         Called after the command line had been successfully parsed. You may override
 294         this method to test for the values of the various parameters which could be
 295         set from the command line.
 296
 297         Don't forget to call the base class version unless you want to suppress
 298         processing of the standard command line options.
 299         Return @true to continue normal execution or @false to return @false from
 300         OnInit() thus terminating the program.
 301
 302         @see OnInitCmdLine()
 303     */
 304     virtual bool OnCmdLineParsed(wxCmdLineParser& parser);
 305
 306     /**
 307         This function is called if an unhandled exception occurs inside the main
 308         application event loop. It can return @true to ignore the exception and to
 309         continue running the loop or @false to exit the loop and terminate the
 310         program. In the latter case it can also use C++ @c throw keyword to
 311         rethrow the current exception.
 312
 313         The default behaviour of this function is the latter in all ports except under
 314         Windows where a dialog is shown to the user which allows him to choose between
 315         the different options. You may override this function in your class to do
 316         something more appropriate.
 317
 318         Finally note that if the exception is rethrown from here, it can be caught in
 319         OnUnhandledException().
 320     */
 321     virtual bool OnExceptionInMainLoop();
 322
 323     /**
 324         Override this member function for any processing which needs to be
 325         done as the application is about to exit. OnExit is called after
 326         destroying all application windows and controls, but before
 327         wxWidgets cleanup. Note that it is not called at all if
 328         OnInit() failed.
 329
 330         The return value of this function is currently ignored, return the same
 331         value as returned by the base class method if you override it.
 332     */
 333     virtual int OnExit();
 334
 335     /**
 336         This function may be called if something fatal happens: an unhandled
 337         exception under Win32 or a a fatal signal under Unix, for example. However,
 338         this will not happen by default: you have to explicitly call
 339         wxHandleFatalExceptions() to enable this.
 340
 341         Generally speaking, this function should only show a message to the user and
 342         return. You may attempt to save unsaved data but this is not guaranteed to
 343         work and, in fact, probably won't.
 344
 345         @see wxHandleFatalExceptions()
 346     */
 347     virtual void OnFatalException();
 348
 349     /**
 350         This must be provided by the application, and will usually create the
 351         application's main window, optionally calling SetTopWindow().
 352
 353         You may use OnExit() to clean up anything initialized here, provided
 354         that the function returns @true.
 355
 356         Notice that if you want to to use the command line processing provided by
 357         wxWidgets you have to call the base class version in the derived class
 358         OnInit().
 359
 360         Return @true to continue processing, @false to exit the application
 361         immediately.
 362     */
 363     virtual bool OnInit();
 364
 365     /**
 366         Called from OnInit() and may be used to initialize the parser with the
 367         command line options for this application. The base class versions adds
 368         support for a few standard options only.
 369     */
 370     virtual void OnInitCmdLine(wxCmdLineParser& parser);
 371
 372     /**
 373         This virtual function is where the execution of a program written in wxWidgets
 374         starts. The default implementation just enters the main loop and starts
 375         handling the events until it terminates, either because ExitMainLoop() has
 376         been explicitly called or because the last frame has been deleted and
 377         GetExitOnFrameDelete() flag is @true (this is the default).
 378
 379         The return value of this function becomes the exit code of the program, so it
 380         should return 0 in case of successful termination.
 381     */
 382     virtual int OnRun();
 383
 384     /**
 385         This function is called when an unhandled C++ exception occurs inside
 386         OnRun() (the exceptions which occur during the program startup and shutdown
 387         might not be caught at all). Notice that by now the main event loop has been
 388         terminated and the program will exit, if you want to prevent this from happening
 389         (i.e. continue running after catching an exception) you need to override
 390         OnExceptionInMainLoop().
 391
 392         The default implementation shows information about the exception in debug build
 393         but does nothing in the release build.
 394     */
 395     virtual void OnUnhandledException();
 396
 397     /**
 398         Returns @true if unprocessed events are in the window system event queue.
 399
 400         @see Dispatch()
 401     */
 402     virtual bool Pending();
 403
 404     /**
 405         Set the application name to be used in the user-visible places such as
 406         window titles.
 407
 408         See GetAppDisplayName() for more about the differences between the
 409         display name and name.
 410
 411         Notice that if this function is called, the name is used as is, without
 412         any capitalization as done by default by GetAppDisplayName().
 413     */
 414     void SetAppDisplayName(const wxString& name);
 415
 416     /**
 417         Sets the name of the application. This name should be used for file names,
 418         configuration file entries and other internal strings. For the user-visible
 419         strings, such as the window titles, the application display name set by
 420         SetAppDisplayName() is used instead.
 421
 422         By default the application name is set to the name of its executable file.
 423
 424         @see GetAppName()
 425     */
 426     void SetAppName(const wxString& name);
 427
 428     /**
 429         Sets the class name of the application. This may be used in a platform specific
 430         manner to refer to the application.
 431
 432         @see GetClassName()
 433     */
 434     void SetClassName(const wxString& name);
 435
 436     /**
 437         Allows external code to modify global ::wxTheApp, but you should really
 438         know what you're doing if you call it.
 439
 440         @param app
 441             Replacement for the global application object.
 442
 443         @see GetInstance()
 444     */
 445     static void SetInstance(wxAppConsole* app);
 446
 447     /**
 448         Set the vendor name to be used in the user-visible places.
 449         See GetVendorDisplayName() for more about the differences between the
 450         display name and name.
 451     */
 452     void SetVendorDisplayName(const wxString& name);
 453
 454     /**
 455         Sets the name of application's vendor. The name will be used
 456         in registry access. A default name is set by wxWidgets.
 457
 458         @see GetVendorName()
 459     */
 460     void SetVendorName(const wxString& name);
 461
 462     /**
 463         Yields control to pending messages in the windowing system.
 464
 465         This can be useful, for example, when a time-consuming process writes to a
 466         text window. Without an occasional yield, the text window will not be updated
 467         properly, and on systems with cooperative multitasking, such as Windows 3.1
 468         other processes will not respond.
 469
 470         Caution should be exercised, however, since yielding may allow the
 471         user to perform actions which are not compatible with the current task.
 472         Disabling menu items or whole menus during processing can avoid unwanted
 473         reentrance of code: see ::wxSafeYield for a better function.
 474         You can avoid unwanted reentrancies also using IsYielding().
 475
 476         Note that Yield() will not flush the message logs. This is intentional as
 477         calling Yield() is usually done to quickly update the screen and popping up
 478         a message box dialog may be undesirable. If you do wish to flush the log
 479         messages immediately (otherwise it will be done during the next idle loop
 480         iteration), call wxLog::FlushActive.
 481
 482         Calling Yield() recursively is normally an error and an assert failure is
 483         raised in debug build if such situation is detected. However if the
 484         @a onlyIfNeeded parameter is @true, the method will just silently
 485         return @false instead.
 486     */
 487     virtual bool Yield(bool onlyIfNeeded = false);
 488
 489     /**
 490         Number of command line arguments (after environment-specific processing).
 491     */
 492     int argc;
 493
 494     /**
 495         Command line arguments (after environment-specific processing).
 496
 497         Under Windows and Linux/Unix, you should parse the command line
 498         arguments and check for files to be opened when starting your
 499         application. Under OS X, you need to override MacOpenFile()
 500         since command line arguments are used differently there.
 501
 502         You may use the wxCmdLineParser to parse command line arguments.
 503     */
 504     wxChar** argv;
 505 };
 506
 507
 508
 509
 510 /**
 511     @class wxApp
 512
 513     The wxApp class represents the application itself when @c wxUSE_GUI=1.
 514
 515     In addition to the features provided by wxAppConsole it keeps track of
 516     the <em>top window</em> (see SetTopWindow()) and adds support for
 517     video modes (see SetVideoMode()).
 518
 519     In general, application-wide settings for GUI-only apps are accessible
 520     from wxApp (or from wxSystemSettings).
 521
 522     @library{wxbase}
 523     @category{appmanagement}
 524
 525     @see @ref overview_app, wxAppTraits, wxEventLoop, wxSystemSettings
 526 */
 527 class wxApp : public wxAppConsole
 528 {
 529 public:
 530     /**
 531         Constructor. Called implicitly with a definition of a wxApp object.
 532     */
 533     wxApp();
 534
 535     /**
 536         Destructor. Will be called implicitly on program exit if the wxApp
 537         object is created on the stack.
 538     */
 539     virtual ~wxApp();
 540
 541     /**
 542         Get display mode that is used use. This is only used in framebuffer
 543         wxWin ports (such as wxMGL or wxDFB).
 544     */
 545     virtual wxVideoMode GetDisplayMode() const;
 546
 547     /**
 548         Returns @true if the application will exit when the top-level frame is deleted.
 549
 550         @see SetExitOnFrameDelete()
 551     */
 552     bool GetExitOnFrameDelete() const;
 553
 554     /**
 555         Return the layout direction for the current locale or @c wxLayout_Default
 556         if it's unknown.
 557     */
 558     virtual wxLayoutDirection GetLayoutDirection() const;
 559
 560     /**
 561         Returns @true if the application will use the best visual on systems that support
 562         different visuals, @false otherwise.
 563
 564         @see SetUseBestVisual()
 565     */
 566     bool GetUseBestVisual() const;
 567
 568     /**
 569         Returns a pointer to the top window.
 570
 571         @remarks
 572             If the top window hasn't been set using SetTopWindow(), this function
 573             will find the first top-level window (frame or dialog or instance of
 574             wxTopLevelWindow) from the internal top level window list and return that.
 575
 576         @see SetTopWindow()
 577     */
 578     virtual wxWindow* GetTopWindow() const;
 579
 580     /**
 581         Returns @true if the application is active, i.e. if one of its windows is
 582         currently in the foreground.
 583
 584         If this function returns @false and you need to attract users attention to
 585         the application, you may use wxTopLevelWindow::RequestUserAttention to do it.
 586     */
 587     virtual bool IsActive() const;
 588
 589     /**
 590         Windows-only function for processing a message. This function is called
 591         from the main message loop, checking for windows that may wish to process it.
 592
 593         The function returns @true if the message was processed, @false otherwise.
 594         If you use wxWidgets with another class library with its own message loop,
 595         you should make sure that this function is called to allow wxWidgets to
 596         receive messages. For example, to allow co-existence with the Microsoft
 597         Foundation Classes, override the PreTranslateMessage function:
 598
 599         @code
 600         // Provide wxWidgets message loop compatibility
 601         BOOL CTheApp::PreTranslateMessage(MSG *msg)
 602         {
 603             if (wxTheApp && wxTheApp->ProcessMessage((WXMSW *)msg))
 604                 return true;
 605             else
 606                 return CWinApp::PreTranslateMessage(msg);
 607         }
 608         @endcode
 609
 610         @onlyfor{wxmsw}
 611     */
 612     bool ProcessMessage(WXMSG* msg);
 613
 614     /**
 615         Sends idle events to a window and its children.
 616         Please note that this function is internal to wxWidgets and shouldn't be used
 617         by user code.
 618
 619         @remarks These functions poll the top-level windows, and their children,
 620                  for idle event processing. If @true is returned, more OnIdle
 621                  processing is requested by one or more window.
 622
 623         @see wxIdleEvent
 624     */
 625     virtual bool SendIdleEvents(wxWindow* win, wxIdleEvent& event);
 626
 627     /**
 628         Set display mode to use. This is only used in framebuffer wxWin
 629         ports (such as wxMGL or wxDFB). This method should be called from
 630         wxApp::OnInitGui.
 631     */
 632     virtual bool SetDisplayMode(const wxVideoMode& info);
 633
 634     /**
 635         Allows the programmer to specify whether the application will exit when the
 636         top-level frame is deleted.
 637
 638         @param flag
 639             If @true (the default), the application will exit when the top-level frame
 640             is deleted. If @false, the application will continue to run.
 641
 642         @see GetExitOnFrameDelete(), @ref overview_app_shutdown
 643     */
 644     void SetExitOnFrameDelete(bool flag);
 645
 646     /**
 647         Allows external code to modify global ::wxTheApp, but you should really
 648         know what you're doing if you call it.
 649
 650         @param app
 651             Replacement for the global application object.
 652
 653         @see GetInstance()
 654     */
 655     static void SetInstance(wxAppConsole* app);
 656
 657     /**
 658         Allows runtime switching of the UI environment theme.
 659
 660         Currently implemented for wxGTK2-only.
 661         Return @true if theme was successfully changed.
 662
 663         @param theme
 664             The name of the new theme or an absolute path to a gtkrc-theme-file
 665     */
 666     virtual bool SetNativeTheme(const wxString& theme);
 667
 668     /**
 669         Sets the 'top' window. You can call this from within OnInit() to let wxWidgets
 670         know which is the main window. You don't have to set the top window;
 671         it is only a convenience so that (for example) certain dialogs without parents
 672         can use a specific window as the top window.
 673
 674         If no top window is specified by the application, wxWidgets just uses the
 675         first frame or dialog (or better, any wxTopLevelWindow) in its top-level
 676         window list, when it needs to use the top window.
 677         If you previously called SetTopWindow() and now you need to restore this
 678         automatic behaviour you can call @code wxApp::SetTopWindow(NULL) @endcode.
 679
 680         @param window
 681             The new top window.
 682
 683         @see GetTopWindow(), OnInit()
 684     */
 685     void SetTopWindow(wxWindow* window);
 686
 687     /**
 688         Allows the programmer to specify whether the application will use the best
 689         visual on systems that support several visual on the same display. This is typically
 690         the case under Solaris and IRIX, where the default visual is only 8-bit whereas
 691         certain applications are supposed to run in TrueColour mode.
 692
 693         Note that this function has to be called in the constructor of the wxApp
 694         instance and won't have any effect when called later on.
 695         This function currently only has effect under GTK.
 696
 697         @param flag
 698             If @true, the app will use the best visual.
 699         @param forceTrueColour
 700             If @true then the application will try to force using a TrueColour
 701             visual and abort the app if none is found.
 702     */
 703     void SetUseBestVisual(bool flag, bool forceTrueColour = false);
 704 };
 705
 706
 707
 708 // ============================================================================
 709 // Global functions/macros
 710 // ============================================================================
 711
 712
 713 /** @ingroup group_funcmacro_rtti */
 714 //@{
 715
 716 /**
 717     This is used in headers to create a forward declaration of the ::wxGetApp()
 718     function implemented by IMPLEMENT_APP().
 719
 720     It creates the declaration <tt>className& wxGetApp()</tt>.
 721
 722     @header{wx/app.h}
 723
 724     Example:
 725
 726     @code
 727     DECLARE_APP(MyApp)
 728     @endcode
 729 */
 730 #define DECLARE_APP( className )
 731
 732 /**
 733     This is used in the application class implementation file to make the
 734     application class known to wxWidgets for dynamic construction.
 735
 736     @header{wx/app.h}
 737
 738     Example:
 739
 740     @code
 741     IMPLEMENT_APP(MyApp)
 742     @endcode
 743
 744     @see DECLARE_APP().
 745 */
 746 #define IMPLEMENT_APP( className )
 747
 748 //@}
 749
 750
 751
 752 /**
 753     The global pointer to the singleton wxApp object.
 754
 755     @see wxApp::GetInstance()
 756 */
 757 wxApp *wxTheApp;
 758
 759
 760
 761 /** @ingroup group_funcmacro_appinitterm */
 762 //@{
 763
 764 /**
 765     This function doesn't exist in wxWidgets but it is created by using the
 766     IMPLEMENT_APP() macro.
 767
 768     Thus, before using it anywhere but in the same module where this macro is
 769     used, you must make it available using DECLARE_APP().
 770
 771     The advantage of using this function compared to directly using the global
 772     ::wxTheApp pointer is that the latter is of type wxApp* and so wouldn't
 773     allow you to access the functions specific to your application class but
 774     not present in wxApp while wxGetApp() returns the object of the right type.
 775
 776     @header{wx/app.h}
 777 */
 778 wxAppDerivedClass& wxGetApp();
 779
 780 /**
 781     If @a doIt is @true, the fatal exceptions (also known as general protection
 782     faults under Windows or segmentation violations in the Unix world) will be
 783     caught and passed to wxApp::OnFatalException.
 784
 785     By default, i.e. before this function is called, they will be handled in
 786     the normal way which usually just means that the application will be
 787     terminated. Calling wxHandleFatalExceptions() with @a doIt equal to @false
 788     will restore this default behaviour.
 789
 790     Notice that this function is only available if @c wxUSE_ON_FATAL_EXCEPTION
 791     is 1 and under Windows platform this requires a compiler with support for
 792     SEH (structured exception handling) which currently means only Microsoft
 793     Visual C++ or a recent Borland C++ version.
 794
 795     @header{wx/app.h}
 796 */
 797 bool wxHandleFatalExceptions(bool doIt = true);
 798
 799 /**
 800     This function is used in wxBase only and only if you don't create
 801     wxApp object at all. In this case you must call it from your
 802     @c main() function before calling any other wxWidgets functions.
 803
 804     If the function returns @false the initialization could not be performed,
 805     in this case the library cannot be used and wxUninitialize() shouldn't be
 806     called neither.
 807
 808     This function may be called several times but wxUninitialize() must be
 809     called for each successful call to this function.
 810
 811     @header{wx/app.h}
 812 */
 813 bool wxInitialize();
 814
 815 /**
 816     This function is for use in console (wxBase) programs only. It must be called
 817     once for each previous successful call to wxInitialize().
 818
 819     @header{wx/app.h}
 820 */
 821 void wxUninitialize();
 822
 823 /**
 824     This function wakes up the (internal and platform dependent) idle system,
 825     i.e. it will force the system to send an idle event even if the system
 826     currently @e is idle and thus would not send any idle event until after
 827     some other event would get sent. This is also useful for sending events
 828     between two threads and is used by the corresponding functions
 829     wxPostEvent() and wxEvtHandler::AddPendingEvent().
 830
 831     @header{wx/app.h}
 832 */
 833 void wxWakeUpIdle();
 834
 835 /**
 836     Calls wxApp::Yield.
 837
 838     @deprecated
 839     This function is kept only for backwards compatibility. Please use
 840     the wxApp::Yield method instead in any new code.
 841
 842     @header{wx/app.h}
 843 */
 844 bool wxYield();
 845
 846 /**
 847     This function is similar to wxYield(), except that it disables the user
 848     input to all program windows before calling wxYield() and re-enables it
 849     again afterwards. If @a win is not @NULL, this window will remain enabled,
 850     allowing the implementation of some limited user interaction.
 851     Returns the result of the call to ::wxYield.
 852
 853     @header{wx/app.h}
 854 */
 855 bool wxSafeYield(wxWindow* win = NULL, bool onlyIfNeeded = false);
 856
 857 /**
 858     This function initializes wxWidgets in a platform-dependent way. Use this if you
 859     are not using the default wxWidgets entry code (e.g. main or WinMain).
 860
 861     For example, you can initialize wxWidgets from an Microsoft Foundation Classes
 862     (MFC) application using this function.
 863
 864     @note This overload of wxEntry is available under all platforms.
 865
 866     @see wxEntryStart()
 867
 868     @header{wx/app.h}
 869 */
 870 int wxEntry(int& argc, wxChar** argv);
 871
 872 /**
 873     See wxEntry(int&,wxChar**) for more info about this function.
 874
 875     Notice that under Windows CE platform, and only there, the type of @a pCmdLine
 876     is @c wchar_t *, otherwise it is @c char *, even in Unicode build.
 877
 878     @remarks To clean up wxWidgets, call wxApp::OnExit followed by the static
 879              function wxApp::CleanUp. For example, if exiting from an MFC application
 880              that also uses wxWidgets:
 881              @code
 882              int CTheApp::ExitInstance()
 883              {
 884                 // OnExit isn't called by CleanUp so must be called explicitly.
 885                 wxTheApp->OnExit();
 886                 wxApp::CleanUp();
 887
 888                 return CWinApp::ExitInstance();
 889              }
 890              @endcode
 891
 892     @header{wx/app.h}
 893 */
 894 int wxEntry(HINSTANCE hInstance,
 895             HINSTANCE hPrevInstance = NULL,
 896             char* pCmdLine = NULL,
 897             int nCmdShow = SW_SHOWNORMAL);
 898
 899 //@}
 900
 901
 902
 903 /** @ingroup group_funcmacro_procctrl */
 904 //@{
 905
 906 /**
 907     Exits application after calling wxApp::OnExit.
 908
 909     Should only be used in an emergency: normally the top-level frame
 910     should be deleted (after deleting all other frames) to terminate the
 911     application. See wxCloseEvent and wxApp.
 912
 913     @header{wx/app.h}
 914 */
 915 void wxExit();
 916
 917 //@}
 918