// Purpose: interface of wxApp
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
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.
@see @ref overview_app, wxApp, wxAppTraits, wxEventLoopBase
*/
-class wxAppConsole : public wxEvtHandler
+class wxAppConsole : public wxEvtHandler,
+ public wxEventFilter
{
protected:
/**
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
wxEventFunction func,
wxEvent& event) const;
+ /**
+ 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;
+
//@}
/**
- Allows external code to modify global ::wxTheApp, but you should really
- know what you're doing if you call it.
+ @name Pending events
- @param app
- Replacement for the global application object.
+ 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).
+ */
+ //@{
- @see GetInstance()
+ /**
+ Process all pending events; it is necessary to call this function to
+ 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 function will immediately return and do nothing if SuspendProcessingOfPendingEvents()
+ was called.
*/
- static void SetInstance(wxAppConsole* app);
+ virtual void ProcessPendingEvents();
/**
- Returns the one and only global application object.
- Usually ::wxTheApp is used instead.
+ Deletes the pending events of all wxEvtHandlers of this application.
- @see SetInstance()
+ See wxEvtHandler::DeletePendingEvents() for warnings about deleting the pending
+ events.
*/
- static wxAppConsole* GetInstance();
+ void DeletePendingEvents();
/**
- Returns @true if the main event loop is currently running, i.e. if the
- application is inside OnRun().
+ Returns @true if there are pending events on the internal pending event list.
- This can be useful to test whether events can be dispatched. For example,
- if this function returns @false, non-blocking sockets cannot be used because
- the events from them would never be processed.
+ 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.
*/
- static bool IsMainLoopRunning();
+ bool HasPendingEvents() const;
+ /**
+ Temporary suspends processing of the pending events.
+
+ @see ResumeProcessingOfPendingEvents()
+ */
+ void SuspendProcessingOfPendingEvents();
/**
- @name Mac-specific functions
+ Resume processing of the pending events previously stopped because of a
+ call to SuspendProcessingOfPendingEvents().
*/
- //@{
+ void ResumeProcessingOfPendingEvents();
+
+ //@}
/**
- Called in response of an "open-application" Apple event.
- Override this to create a new document in your app.
+ Delayed objects destruction.
- @onlyfor{wxmac}
- */
- virtual void MacNewFile();
+ 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.
+ */
+ //@{
/**
- Called in response of an "open-document" Apple event.
+ Schedule the object for destruction in the near future.
- 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.
+ 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.
- @onlyfor{wxmac}
- */
- virtual void MacOpenFile(const wxString& fileName);
+ 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);
/**
- Called in response of a "get-url" Apple event.
+ Check if the object had been scheduled for destruction with
+ ScheduleForDestruction().
- @onlyfor{wxmac}
- */
- virtual void MacOpenURL(const wxString& url);
+ 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);
/**
- Called in response of a "print-document" Apple event.
+ Allows external code to modify global ::wxTheApp, but you should really
+ know what you're doing if you call it.
- @onlyfor{wxmac}
+ @param app
+ Replacement for the global application object.
+
+ @see GetInstance()
*/
- virtual void MacPrintFile(const wxString& fileName);
+ static void SetInstance(wxAppConsole* app);
/**
- Called in response of a "reopen-application" Apple event.
+ Returns the one and only global application object.
+ Usually ::wxTheApp is used instead.
- @onlyfor{wxmac}
+ @see SetInstance()
*/
- virtual void MacReopenApp();
+ static wxAppConsole* GetInstance();
- //@}
+ /**
+ Returns @true if the main event loop is currently running, i.e. if the
+ application is inside OnRun().
+ This can be useful to test whether events can be dispatched. For example,
+ if this function returns @false, non-blocking sockets cannot be used because
+ the events from them would never be processed.
+ */
+ static bool IsMainLoopRunning();
/**
@name Callbacks for application-wide "events"
*/
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
/**
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.
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().
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();
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
*/
/**
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()
*/
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.
/**
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;
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);
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();
+
+ //@}
+
};
/**
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 <tt>className& wxGetApp()</tt>.
+ It creates the declaration <tt>className& wxGetApp()</tt>
+ (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 )
//@}
/**
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
//@}
+/** @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()
+
+//@}
+
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