X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/4b2214224f2fdd300791004e53d537ec901ef3ba..cb8ae61385f1c65552585cb55d8f7bd9f1f690b4:/interface/wx/app.h diff --git a/interface/wx/app.h b/interface/wx/app.h index 893ee20c6c..3261fd74aa 100644 --- a/interface/wx/app.h +++ b/interface/wx/app.h @@ -3,7 +3,7 @@ // Purpose: interface of wxApp // Author: wxWidgets team // RCS-ID: $Id$ -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -24,11 +24,11 @@ objects in the application (see wxAppConsole::FilterEvent) @li implement Apple-specific event handlers (see wxAppConsole::MacXXX functions) - You should use the macro IMPLEMENT_APP(appClass) in your application + You should use the macro wxIMPLEMENT_APP(appClass) in your application implementation file to tell wxWidgets how to create an instance of your application class. - Use DECLARE_APP(appClass) in a header file if you want the ::wxGetApp() function + Use wxDECLARE_APP(appClass) in a header file if you want the ::wxGetApp() function (which returns a reference to your application object) to be visible to other files. @@ -37,7 +37,8 @@ @see @ref overview_app, wxApp, wxAppTraits, wxEventLoopBase */ -class wxAppConsole : public wxEvtHandler +class wxAppConsole : public wxEvtHandler, + public wxEventFilter { protected: /** @@ -57,45 +58,49 @@ public: /** @name Event-handling + + Note that you should look at wxEvtLoopBase for more event-processing + documentation. */ //@{ /** - Dispatches the next event in the windowing system event queue. - Blocks until an event appears if there are none currently - (use Pending() if this is not wanted). - - This can be used for programming event loops, e.g. - - @code - while (app.Pending()) - Dispatch(); - @endcode - - @return @false if the event loop should stop and @true otherwise. + Called by wxWidgets on creation of the application. Override this if you wish + to provide your own (environment-dependent) main loop. - @see Pending(), wxEventLoopBase + @return 0 under X, and the wParam of the WM_QUIT message under Windows. */ - virtual bool Dispatch(); + virtual int MainLoop(); /** Call this to explicitly exit the main message (event) loop. You should normally exit the main loop (and the application) by deleting the top window. + + This function simply calls wxEvtLoopBase::Exit() on the active loop. */ virtual void ExitMainLoop(); /** + Overridden wxEventFilter method. + This function is called before processing any event and allows the application - to preempt the processing of some events. + to preempt the processing of some events, see wxEventFilter + documentation for more information. - If this method returns -1 the event is processed normally, otherwise either - @true or @false should be returned and the event processing stops immediately - considering that the event had been already processed (for the former return - value) or that it is not going to be processed at all (for the latter one). + wxApp implementation of this method always return -1 indicating that + the event should be processed normally. */ virtual int FilterEvent(wxEvent& event); + /** + Returns the main event loop instance, i.e. the event loop which is started + by OnRun() and which dispatches all events sent from the native toolkit + to the application (except when new event loops are temporarily set-up). + The returned value maybe @NULL. Put initialization code which needs a + non-@NULL main event loop into OnEventLoopEnter(). + */ + wxEventLoopBase* GetMainLoop() const; /** This function simply invokes the given method @a func of the specified @@ -109,64 +114,117 @@ public: wxEvent& event) const; /** - Returns @true if called from inside Yield(). + Returns @true if the application is using an event loop. + + This function always returns @true for the GUI applications which + must use an event loop but by default only returns @true for the + console programs if an event loop is already running as it can't know + whether one will be created in the future. + + Thus, it only makes sense to override it in console applications which + do use an event loop, to return @true instead of checking if there is a + currently active event loop. + */ + virtual bool UsesEventLoop() const; + + //@} + + + /** + @name Pending events + + Pending events are handled by wxAppConsole rather than wxEventLoopBase + to allow queuing of events even when there's no event loop + (e.g. in wxAppConsole::OnInit). */ - virtual bool IsYielding() const; + //@{ /** Process all pending events; it is necessary to call this function to - process posted events. + process events posted with wxEvtHandler::QueueEvent or wxEvtHandler::AddPendingEvent. + + This happens during each event loop iteration (see wxEventLoopBase) in GUI mode but + it may be also called directly. + + Note that this function does not only process the pending events for the wxApp object + itself (which derives from wxEvtHandler) but also the pending events for @e any + event handler of this application. - This happens during each event loop iteration in GUI mode but if there is - no main loop, it may be also called directly. + This function will immediately return and do nothing if SuspendProcessingOfPendingEvents() + was called. */ virtual void ProcessPendingEvents(); /** - Called by wxWidgets on creation of the application. Override this if you wish - to provide your own (environment-dependent) main loop. + Deletes the pending events of all wxEvtHandlers of this application. - @return 0 under X, and the wParam of the WM_QUIT message under Windows. + See wxEvtHandler::DeletePendingEvents() for warnings about deleting the pending + events. */ - virtual int MainLoop(); + void DeletePendingEvents(); + + /** + Returns @true if there are pending events on the internal pending event list. + + Whenever wxEvtHandler::QueueEvent or wxEvtHandler::AddPendingEvent() are + called (not only for wxApp itself, but for any event handler of the application!), + the internal wxApp's list of handlers with pending events is updated and this + function will return true. + */ + bool HasPendingEvents() const; /** - Returns @true if unprocessed events are in the window system event queue. + Temporary suspends processing of the pending events. - @see Dispatch() + @see ResumeProcessingOfPendingEvents() */ - virtual bool Pending(); + void SuspendProcessingOfPendingEvents(); /** - Yields control to pending messages in the windowing system. + Resume processing of the pending events previously stopped because of a + call to SuspendProcessingOfPendingEvents(). + */ + void ResumeProcessingOfPendingEvents(); - This can be useful, for example, when a time-consuming process writes to a - text window. Without an occasional yield, the text window will not be updated - properly, and on systems with cooperative multitasking, such as Windows 3.1 - other processes will not respond. + //@} - Caution should be exercised, however, since yielding may allow the - user to perform actions which are not compatible with the current task. - Disabling menu items or whole menus during processing can avoid unwanted - reentrance of code: see ::wxSafeYield for a better function. - You can avoid unwanted reentrancies also using IsYielding(). + /** + Delayed objects destruction. - Note that Yield() will not flush the message logs. This is intentional as - calling Yield() is usually done to quickly update the screen and popping up - a message box dialog may be undesirable. If you do wish to flush the log - messages immediately (otherwise it will be done during the next idle loop - iteration), call wxLog::FlushActive. + In applications using events it may be unsafe for an event handler to + delete the object which generated the event because more events may be + still pending for the same object. In this case the handler may call + ScheduleForDestruction() instead. + */ + //@{ - Calling Yield() recursively is normally an error and an assert failure is - raised in debug build if such situation is detected. However if the - @a onlyIfNeeded parameter is @true, the method will just silently - return @false instead. - */ - virtual bool Yield(bool onlyIfNeeded = false); + /** + Schedule the object for destruction in the near future. + + Notice that if the application is not using an event loop, i.e. if + UsesEventLoop() returns @false, this method will simply delete the + object immediately. + + Examples of using this function inside wxWidgets itself include + deleting the top level windows when they are closed and sockets when + they are disconnected. + */ + void ScheduleForDestruction(wxObject *object); + + /** + Check if the object had been scheduled for destruction with + ScheduleForDestruction(). + + This function may be useful as an optimization to avoid doing something + with an object which will be soon destroyed in any case. + */ + bool IsScheduledForDestruction(wxObject *object) const; //@} + bool Yield(bool onlyIfNeeded = false); + /** Allows external code to modify global ::wxTheApp, but you should really know what you're doing if you call it. @@ -180,7 +238,7 @@ public: /** Returns the one and only global application object. - Usually wxTheApp is used instead. + Usually ::wxTheApp is used instead. @see SetInstance() */ @@ -196,55 +254,6 @@ public: */ static bool IsMainLoopRunning(); - - /** - @name Mac-specific functions - */ - //@{ - - /** - Called in response of an "open-application" Apple event. - Override this to create a new document in your app. - - @onlyfor{wxmac} - */ - virtual void MacNewFile(); - - /** - Called in response of an "open-document" Apple event. - - You need to override this method in order to open a document file after the - user double clicked on it or if the document file was dropped on either the - running application or the application icon in Finder. - - @onlyfor{wxmac} - */ - virtual void MacOpenFile(const wxString& fileName); - - /** - Called in response of a "get-url" Apple event. - - @onlyfor{wxmac} - */ - virtual void MacOpenURL(const wxString& url); - - /** - Called in response of a "print-document" Apple event. - - @onlyfor{wxmac} - */ - virtual void MacPrintFile(const wxString& fileName); - - /** - Called in response of a "reopen-application" Apple event. - - @onlyfor{wxmac} - */ - virtual void MacReopenApp(); - - //@} - - /** @name Callbacks for application-wide "events" */ @@ -315,6 +324,26 @@ public: */ virtual bool OnCmdLineParsed(wxCmdLineParser& parser); + /** + Called by wxEventLoopBase::SetActive(): you can override this function + and put here the code which needs an active event loop. + + Note that this function is called whenever an event loop is activated; + you may want to use wxEventLoopBase::IsMain() to perform initialization + specific for the app's main event loop. + + @see OnEventLoopExit() + */ + virtual void OnEventLoopEnter(wxEventLoopBase* loop); + + /** + Called by wxEventLoopBase::OnExit() for each event loop which + is exited. + + @see OnEventLoopEnter() + */ + virtual void OnEventLoopExit(wxEventLoopBase* loop); + /** This function is called if an unhandled exception occurs inside the main application event loop. It can return @true to ignore the exception and to @@ -346,7 +375,7 @@ public: /** This function may be called if something fatal happens: an unhandled - exception under Win32 or a a fatal signal under Unix, for example. However, + exception under Win32 or a fatal signal under Unix, for example. However, this will not happen by default: you have to explicitly call wxHandleFatalExceptions() to enable this. @@ -365,7 +394,7 @@ public: You may use OnExit() to clean up anything initialized here, provided that the function returns @true. - Notice that if you want to to use the command line processing provided by + Notice that if you want to use the command line processing provided by wxWidgets you have to call the base class version in the derived class OnInit(). @@ -394,15 +423,21 @@ public: virtual int OnRun(); /** - This function is called when an unhandled C++ exception occurs inside - OnRun() (the exceptions which occur during the program startup and shutdown - might not be caught at all). Notice that by now the main event loop has been - terminated and the program will exit, if you want to prevent this from happening - (i.e. continue running after catching an exception) you need to override - OnExceptionInMainLoop(). + This function is called when an unhandled C++ exception occurs in user + code called by wxWidgets. + + Any unhandled exceptions thrown from (overridden versions of) OnInit() + and OnExit() methods as well as any exceptions thrown from inside the + main loop and re-thrown by OnUnhandledException() will result in a call + to this function. - The default implementation shows information about the exception in debug build - but does nothing in the release build. + By the time this function is called, the program is already about to + exit and the exception can't be handled nor ignored any more, override + OnUnhandledException() or use explicit @c try/catch blocks around + OnInit() body to be able to handle the exception earlier. + + The default implementation dumps information about the exception using + wxMessageOutputBest. */ virtual void OnUnhandledException(); @@ -421,8 +456,13 @@ public: is that this one is meant to be shown to the user and so should be used for the window titles, page headers and so on while the other one should be only used internally, e.g. for the file names or - configuration file keys. By default, returns the application name as - returned by GetAppName() capitalized using wxString::Capitalize(). + configuration file keys. + + If the application name for display had been previously set by + SetAppDisplayName(), it will be returned by this function. Otherwise, + if SetAppName() had been called its value will be returned; also as is. + Finally if none was called, this function returns the program name + capitalized using wxString::Capitalize(). @since 2.9.0 */ @@ -431,8 +471,9 @@ public: /** Returns the application name. - @remarks wxWidgets sets this to a reasonable default before calling - OnInit(), but the application can reset it at will. + If SetAppName() had been called, returns the string passed to it. + Otherwise returns the program name, i.e. the value of @c argv[0] passed + to the @c main() function. @see GetAppDisplayName() */ @@ -531,7 +572,7 @@ public: Under Windows and Linux/Unix, you should parse the command line arguments and check for files to be opened when starting your - application. Under OS X, you need to override MacOpenFile() + application. Under OS X, you need to override MacOpenFiles() since command line arguments are used differently there. You may use the wxCmdLineParser to parse command line arguments. @@ -554,6 +595,25 @@ public: In general, application-wide settings for GUI-only apps are accessible from wxApp (or from wxSystemSettings or wxSystemOptions classes). + @beginEventEmissionTable + @event{EVT_QUERY_END_SESSION(func)} + Process a query end session event, supplying the member function. + See wxCloseEvent. + @event{EVT_END_SESSION(func)} + Process an end session event, supplying the member function. + See wxCloseEvent. + @event{EVT_ACTIVATE_APP(func)} + Process a @c wxEVT_ACTIVATE_APP event. See wxActivateEvent. + @event{EVT_HIBERNATE(func)} + Process a hibernate event. See wxActivateEvent. + @event{EVT_DIALUP_CONNECTED(func)} + A connection with the network was established. See wxDialUpEvent. + @event{EVT_DIALUP_DISCONNECTED(func)} + The connection with the network was lost. See wxDialUpEvent. + @event{EVT_IDLE(func)} + Process a @c wxEVT_IDLE event. See wxIdleEvent. + @endEventTable + @library{wxbase} @category{appmanagement} @@ -575,7 +635,7 @@ public: /** Get display mode that is used use. This is only used in framebuffer - wxWin ports (such as wxMGL or wxDFB). + wxWidgets ports such as wxDFB. */ virtual wxVideoMode GetDisplayMode() const; @@ -621,6 +681,25 @@ public: */ virtual bool IsActive() const; + /** + This function is similar to wxYield(), except that it disables the user + input to all program windows before calling wxAppConsole::Yield and re-enables it + again afterwards. If @a win is not @NULL, this window will remain enabled, + allowing the implementation of some limited user interaction. + Returns the result of the call to wxAppConsole::Yield. + + @see wxSafeYield + */ + virtual bool SafeYield(wxWindow *win, bool onlyIfNeeded); + + /** + Works like SafeYield() with @e onlyIfNeeded == @true except that + it allows the caller to specify a mask of events to be processed. + + See wxAppConsole::YieldFor for more info. + */ + virtual bool SafeYieldFor(wxWindow *win, long eventsToProcess); + /** Windows-only function for processing a message. This function is called from the main message loop, checking for windows that may wish to process it. @@ -647,22 +726,8 @@ public: bool ProcessMessage(WXMSG* msg); /** - Sends idle events to a window and its children. - Please note that this function is internal to wxWidgets and shouldn't be used - by user code. - - @remarks These functions poll the top-level windows, and their children, - for idle event processing. If @true is returned, more OnIdle - processing is requested by one or more window. - - @see wxIdleEvent - */ - virtual bool SendIdleEvents(wxWindow* win, wxIdleEvent& event); - - /** - Set display mode to use. This is only used in framebuffer wxWin - ports (such as wxMGL or wxDFB). This method should be called from - wxApp::OnInitGui. + Set display mode to use. This is only used in framebuffer wxWidgets + ports such as wxDFB. */ virtual bool SetDisplayMode(const wxVideoMode& info); @@ -725,6 +790,72 @@ public: visual and abort the app if none is found. */ void SetUseBestVisual(bool flag, bool forceTrueColour = false); + + + /** + @name Mac-specific functions + */ + //@{ + + /** + Called in response of an "open-application" Apple event. + Override this to create a new document in your app. + + @onlyfor{wxosx} + */ + virtual void MacNewFile(); + + /** + Called in response of an openFiles message with Cocoa, or an + "open-document" Apple event with Carbon. + + You need to override this method in order to open one or more document + files after the user double clicked on it or if the files and/or + folders were dropped on either the application in the dock or the + application icon in Finder. + + By default this method calls MacOpenFile for each file/folder. + + @onlyfor{wxosx} + + @since 2.9.3 + */ + virtual void MacOpenFiles(const wxArrayString& fileNames); + + /** + Called in response of an "open-document" Apple event. + + @deprecated + This function is kept mostly for backwards compatibility. Please + override wxApp::MacOpenFiles method instead in any new code. + + @onlyfor{wxosx} + */ + virtual void MacOpenFile(const wxString& fileName); + + /** + Called in response of a "get-url" Apple event. + + @onlyfor{wxosx} + */ + virtual void MacOpenURL(const wxString& url); + + /** + Called in response of a "print-document" Apple event. + + @onlyfor{wxosx} + */ + virtual void MacPrintFile(const wxString& fileName); + + /** + Called in response of a "reopen-application" Apple event. + + @onlyfor{wxosx} + */ + virtual void MacReopenApp(); + + //@} + }; @@ -739,35 +870,37 @@ public: /** This is used in headers to create a forward declaration of the ::wxGetApp() - function implemented by IMPLEMENT_APP(). + function implemented by wxIMPLEMENT_APP(). - It creates the declaration className& wxGetApp(). + It creates the declaration className& wxGetApp() + (requires a final semicolon). @header{wx/app.h} Example: @code - DECLARE_APP(MyApp) + wxDECLARE_APP(MyApp); @endcode */ -#define DECLARE_APP( className ) +#define wxDECLARE_APP( className ) /** This is used in the application class implementation file to make the application class known to wxWidgets for dynamic construction. + Note that this macro requires a final semicolon. @header{wx/app.h} Example: @code - IMPLEMENT_APP(MyApp) + wxIMPLEMENT_APP(MyApp); @endcode - @see DECLARE_APP(). + @see wxDECLARE_APP() */ -#define IMPLEMENT_APP( className ) +#define wxIMPLEMENT_APP( className ) //@} @@ -787,10 +920,10 @@ wxApp *wxTheApp; /** This function doesn't exist in wxWidgets but it is created by using the - IMPLEMENT_APP() macro. + wxIMPLEMENT_APP() macro. Thus, before using it anywhere but in the same module where this macro is - used, you must make it available using DECLARE_APP(). + used, you must make it available using wxDECLARE_APP(). The advantage of using this function compared to directly using the global ::wxTheApp pointer is that the latter is of type wxApp* and so wouldn't @@ -857,22 +990,18 @@ void wxUninitialize(); void wxWakeUpIdle(); /** - Calls wxApp::Yield. + Calls wxAppConsole::Yield. @deprecated This function is kept only for backwards compatibility. Please use - the wxApp::Yield method instead in any new code. + the wxAppConsole::Yield method instead in any new code. @header{wx/app.h} */ bool wxYield(); /** - This function is similar to wxYield(), except that it disables the user - input to all program windows before calling wxYield() and re-enables it - again afterwards. If @a win is not @NULL, this window will remain enabled, - allowing the implementation of some limited user interaction. - Returns the result of the call to ::wxYield. + Calls wxApp::SafeYield. @header{wx/app.h} */ @@ -940,3 +1069,37 @@ void wxExit(); //@} +/** @addtogroup group_funcmacro_debug */ +//@{ + +/** + @def wxDISABLE_DEBUG_SUPPORT() + + Use this macro to disable all debugging code in release build when not + using wxIMPLEMENT_APP(). + + Currently this macro disables assert checking and debug and trace level + logging messages in release build (i.e. when @c NDEBUG is defined). It is + used by wxIMPLEMENT_APP() macro so you only need to use it explicitly if you + don't use this macro but initialize wxWidgets directly (e.g. calls + wxEntry() or wxEntryStart() itself). + + If you do not want to disable debugging code even in release build of your + application, you can use wxSetDefaultAssertHandler() and + wxLog::SetLogLevel() with @c wxLOG_Max parameter to enable assertions and + debug logging respectively. + + @see wxDISABLE_ASSERTS_IN_RELEASE_BUILD(), + wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD(), + @ref overview_debugging + + @since 2.9.1 + + @header{wx/app.h} + */ +#define wxDISABLE_DEBUG_SUPPORT() \ + wxDISABLE_ASSERTS_IN_RELEASE_BUILD(); \ + wxDISABLE_DEBUG_LOGGING_IN_RELEASE_BUILD() + +//@} +