\end{itemize}
You should use the macro IMPLEMENT\_APP(appClass) in your application implementation
-file to tell wxWindows how to create an instance of your application class.
+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 (which returns
a reference to your application object) to be visible to other files.
\latexignore{\rtfignore{\wxheading{Members}}}
+
\membersection{wxApp::wxApp}
\func{void}{wxApp}{\void}
Constructor. Called implicitly with a definition of a wxApp object.
+
\membersection{wxApp::\destruct{wxApp}}
\func{void}{\destruct{wxApp}}{\void}
Destructor. Will be called implicitly on program exit if the wxApp
object is created on the stack.
+
\membersection{wxApp::argc}\label{wxappargc}
\member{int}{argc}
Number of command line arguments (after environment-specific processing).
+
\membersection{wxApp::argv}\label{wxappargv}
\member{char **}{argv}
Command line arguments (after environment-specific processing).
+
\membersection{wxApp::CreateLogTarget}\label{wxappcreatelogtarget}
\func{virtual wxLog*}{CreateLogTarget}{\void}
\helpref{wxLog}{wxlog}
+
\membersection{wxApp::Dispatch}\label{wxappdispatch}
\func{void}{Dispatch}{\void}
\helpref{wxApp::Pending}{wxapppending}
+
+\membersection{wxApp::FilterEvent}\label{wxappfilterevent}
+
+\func{int}{FilterEvent}{\param{wxEvent\& }{event}}
+
+This function is called before processing any event and allows the application
+to preempt the processing of some events. If this method returns $-1$ the event
+is processed normally, otherwise either {\tt true} or {\tt 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).
+
+
\membersection{wxApp::GetAppName}\label{wxappgetappname}
\constfunc{wxString}{GetAppName}{\void}
\wxheading{Remarks}
-wxWindows sets this to a reasonable default before
+wxWidgets sets this to a reasonable default before
calling \helpref{wxApp::OnInit}{wxapponinit}, but the application can reset it at will.
+
\membersection{wxApp::GetAuto3D}\label{wxappgetauto3d}
\constfunc{bool}{GetAuto3D}{\void}
-Returns TRUE if 3D control mode is on, FALSE otherwise.
+Returns true if 3D control mode is on, false otherwise.
\wxheading{See also}
\helpref{wxApp::SetAuto3D}{wxappsetauto3d}
+
\membersection{wxApp::GetClassName}\label{wxappgetclassname}
\constfunc{wxString}{GetClassName}{\void}
\helpref{wxApp::SetClassName}{wxappsetclassname}
+
\membersection{wxApp::GetExitOnFrameDelete}\label{wxappgetexitonframedelete}
-\constfunc{bool}{GetExitFrameOnDelete}{\void}
+\constfunc{bool}{GetExitOnFrameDelete}{\void}
-Returns TRUE if the application will exit when the top-level window is deleted, FALSE
+Returns true if the application will exit when the top-level window is deleted, false
otherwise.
\wxheading{See also}
-\helpref{wxApp::SetExitOnFrameDelete}{wxappsetexitonframedelete}
+\helpref{wxApp::SetExitOnFrameDelete}{wxappsetexitonframedelete},\\
+\helpref{wxApp shutdown overview}{wxappshutdownoverview}
+
\membersection{wxApp::GetTopWindow}\label{wxappgettopwindow}
\helpref{SetTopWindow}{wxappsettopwindow}
+
\membersection{wxApp::GetUseBestVisual}\label{wxappgetusebestvisual}
\constfunc{bool}{GetUseBestVisual}{\void}
-Returns TRUE if the application will use the best visual on systems that support
-different visuals, FALSE otherwise.
+Returns true if the application will use the best visual on systems that support
+different visuals, false otherwise.
\wxheading{See also}
\helpref{SetUseBestVisual}{wxappsetusebestvisual}
+
\membersection{wxApp::GetVendorName}\label{wxappgetvendorname}
\constfunc{wxString}{GetVendorName}{\void}
Returns the application's vendor name.
+
\membersection{wxApp::ExitMainLoop}\label{wxappexitmainloop}
\func{void}{ExitMainLoop}{\void}
You should normally exit the main loop (and the application) by deleting
the top window.
-\membersection{wxApp::Initialized}\label{wxappinitialized}
-
-\func{bool}{Initialized}{\void}
-
-Returns TRUE if the application has been initialized (i.e. if\rtfsp
-\helpref{wxApp::OnInit}{wxapponinit} has returned successfully). This can be useful for error
-message routines to determine which method of output is best for the
-current state of the program (some windowing systems may not like
-dialogs to pop up before the main loop has been entered).
\membersection{wxApp::MainLoop}\label{wxappmainloop}
\func{int}{MainLoop}{\void}
-Called by wxWindows on creation of the application. Override this if you wish
+Called by wxWidgets on creation of the application. Override this if you wish
to provide your own (environment-dependent) main loop.
\wxheading{Return value}
Returns 0 under X, and the wParam of the WM\_QUIT message under Windows.
-\membersection{wxApp::OnActivate}\label{wxapponactivate}
-
-\func{void}{OnActivate}{\param{wxActivateEvent\& }{event}}
-
-Provide this member function to know whether the application is being
-activated or deactivated (Windows only).
-
-\wxheading{See also}
-
-\helpref{wxWindow::OnActivate}{wxwindowonactivate}, \helpref{wxActivateEvent}{wxactivateevent}
-
-\membersection{wxApp::OnExit}\label{wxapponexit}
+%% VZ: OnXXX() functions should *not* be documented
+%%
+%%\membersection{wxApp::OnActivate}\label{wxapponactivate}
+%%
+%%\func{void}{OnActivate}{\param{wxActivateEvent\& }{event}}
+%%
+%%Provide this member function to know whether the application is being
+%%activated or deactivated (Windows only).
+%%
+%%\wxheading{See also}
+%%
+%%\helpref{wxWindow::OnActivate}{wxwindowonactivate}, \helpref{wxActivateEvent}{wxactivateevent}
+%%
+%%\membersection{wxApp::OnCharHook}\label{wxapponcharhook}
+%%
+%%\func{void}{OnCharHook}{\param{wxKeyEvent\&}{ event}}
+%%
+%%This event handler function is called (under Windows only) to allow the window to intercept keyboard events
+%%before they are processed by child windows.
+%%
+%%\wxheading{Parameters}
+%%
+%%\docparam{event}{The keypress event.}
+%%
+%%\wxheading{Remarks}
+%%
+%%Use the wxEVT\_CHAR\_HOOK macro in your event table.
+%%
+%%If you use this member, you can selectively consume keypress events by calling\rtfsp
+%%\helpref{wxEvent::Skip}{wxeventskip} for characters the application is not interested in.
+%%
+%%\wxheading{See also}
+%%
+%%\helpref{wxKeyEvent}{wxkeyevent}, \helpref{wxWindow::OnChar}{wxwindowonchar},\rtfsp
+%%\helpref{wxWindow::OnCharHook}{wxwindowoncharhook}, \helpref{wxDialog::OnCharHook}{wxdialogoncharhook}
-\func{int}{OnExit}{\void}
-Provide this member function for any processing which needs to be done as
-the application is about to exit.
+\membersection{wxApp::OnAssert}\label{wxapponassert}
-\membersection{wxApp::OnCharHook}\label{wxapponcharhook}
+\func{void}{OnAssert}{\param{const wxChar }{*file}, \param{int }{line}, \param{const wxChar }{*cond}, \param{const wxChar }{*msg}}
-\func{void}{OnCharHook}{\param{wxKeyEvent\&}{ event}}
+This function is called when an assert failure occurs, i.e. the condition
+specified in \helpref{wxASSERT}{wxassert} macro evaluated to {\tt false}.
+It is only called in debug mode (when {\tt \_\_WXDEBUG\_\_} is defined) as
+asserts are not left in the release code at all.
-This event handler function is called (under Windows only) to allow the window to intercept keyboard events
-before they are processed by child windows.
+The base class version show the default assert failure dialog box proposing to
+the user to stop the program, continue or ignore all subsequent asserts.
\wxheading{Parameters}
-\docparam{event}{The keypress event.}
+\docparam{file}{the name of the source file where the assert occured}
-\wxheading{Remarks}
-
-Use the wxEVT\_CHAR\_HOOK macro in your event table.
+\docparam{line}{the line number in this file where the assert occured}
-If you use this member, you can selectively consume keypress events by calling\rtfsp
-\helpref{wxEvent::Skip}{wxeventskip} for characters the application is not interested in.
+\docparam{cond}{the condition of the failed assert in string form}
-\wxheading{See also}
+\docparam{msg}{the message specified as argument to
+\helpref{wxASSERT\_MSG}{wxassertmsg} or \helpref{wxFAIL\_MSG}{wxfailmsg}, will
+be {\tt NULL} if just \helpref{wxASSERT}{wxassert} or \helpref{wxFAIL}{wxfail}
+was used}
-\helpref{wxKeyEvent}{wxkeyevent}, \helpref{wxWindow::OnChar}{wxwindowonchar},\rtfsp
-\helpref{wxWindow::OnCharHook}{wxwindowoncharhook}, \helpref{wxDialog::OnCharHook}{wxdialogoncharhook}
\membersection{wxApp::OnCmdLineError}\label{wxapponcmdlineerror}
was specified by the user). The default behaviour is to show the program usage
text and abort the program.
-Return {\tt TRUE} to continue normal execution or {\tt FALSE} to return
-{\tt FALSE} from \helpref{OnInit}{wxapponinit} thus terminating the program.
+Return {\tt true} to continue normal execution or {\tt false} to return
+{\tt false} from \helpref{OnInit}{wxapponinit} thus terminating the program.
\wxheading{See also}
\helpref{OnInitCmdLine}{wxapponinitcmdline}
+
\membersection{wxApp::OnCmdLineHelp}\label{wxapponcmdlinehelp}
\func{bool}{OnCmdLineHelp}{\param{wxCmdLineParser\& }{parser}}
Called when the help option ({\tt --help}) was specified on the command line.
The default behaviour is to show the program usage text and abort the program.
-Return {\tt TRUE} to continue normal execution or {\tt FALSE} to return
-{\tt FALSE} from \helpref{OnInit}{wxapponinit} thus terminating the program.
+Return {\tt true} to continue normal execution or {\tt false} to return
+{\tt false} from \helpref{OnInit}{wxapponinit} thus terminating the program.
\wxheading{See also}
\helpref{OnInitCmdLine}{wxapponinitcmdline}
+
\membersection{wxApp::OnCmdLineParsed}\label{wxapponcmdlineparsed}
\func{bool}{OnCmdLineParsed}{\param{wxCmdLineParser\& }{parser}}
Don't forget to call the base class version unless you want to suppress
processing of the standard command line options.
-Return {\tt TRUE} to continue normal execution or {\tt FALSE} to return
-{\tt FALSE} from \helpref{OnInit}{wxapponinit} thus terminating the program.
+Return {\tt true} to continue normal execution or {\tt false} to return
+{\tt false} from \helpref{OnInit}{wxapponinit} thus terminating the program.
\wxheading{See also}
\helpref{OnInitCmdLine}{wxapponinitcmdline}
+
+\membersection{wxApp::OnExceptionInMainLoop}{wxapponexceptioninmainloop}
+
+\func{virtual bool}{OnExceptionInMainLoop}{\void}
+
+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
+continue running the loop or \false to exit the loop and terminate the
+program. In the latter case it can also use C++ \texttt{throw} keyword to
+rethrow the current exception.
+
+The default behaviour of this function is the latter in all ports except under
+Windows where a dialog is shown to the user which allows him to choose between
+the different options. You may override this function in your class to do
+something more appropriate.
+
+Finally note that if the exception is rethrown from here, it can be caught in
+\helpref{OnUnhandledException}{wxapponunhandledexception}.
+
+
+\membersection{wxApp::OnExit}\label{wxapponexit}
+
+\func{virtual int}{OnExit}{\void}
+
+Override this member function for any processing which needs to be
+done as the application is about to exit. OnExit is called after
+destroying all application windows and controls, but before
+wxWidgets cleanup. Note that it is not called at all if
+\helpref{OnInit}{wxapponinit} failed.
+
+The return value of this function is currently ignored, return the same value
+as returned by the base class method if you override it.
+
+
\membersection{wxApp::OnFatalException}\label{wxapponfatalexception}
\func{void}{OnFatalException}{\void}
\wxheading{See also}
-\helpref{wxHandleFatalExcetions}{wxhandlefatalexceptions}
+\helpref{wxHandleFatalExceptions}{wxhandlefatalexceptions}
%% VZ: the wxApp event handler are private and should not be documented here!
%%
%%since this forwards OnIdle events to windows and also performs garbage collection for
%%windows whose destruction has been delayed.
%%
-%%wxWindows' strategy for OnIdle processing is as follows. After pending user interface events for an
-%%application have all been processed, wxWindows sends an OnIdle event to the application object. wxApp::OnIdle itself
+%%wxWidgets' strategy for OnIdle processing is as follows. After pending user interface events for an
+%%application have all been processed, wxWidgets sends an OnIdle event to the application object. wxApp::OnIdle itself
%%sends an OnIdle event to each application window, allowing windows to do idle processing such as updating
%%their appearance. If either wxApp::OnIdle or a window OnIdle function requested more time, by
-%%caling \helpref{wxIdleEvent::RequestMore}{wxidleeventrequestmore}, wxWindows will send another OnIdle
+%%calling \helpref{wxIdleEvent::RequestMore}{wxidleeventrequestmore}, wxWidgets will send another OnIdle
%%event to the application object. This will occur in a loop until either a user event is found to be
%%pending, or OnIdle requests no more time. Then all pending user events are processed until the system
%%goes idle again, when OnIdle is called, and so on.
%%
%%Use the EVT\_END\_SESSION event table macro to handle query end session events.
%%
-%%The default handler calls \helpref{wxWindow::Close}{wxwindowclose} with a TRUE argument
+%%The default handler calls \helpref{wxWindow::Close}{wxwindowclose} with a true argument
%%(forcing the application to close itself silently).
%%
%%\wxheading{Remarks}
%%\helpref{wxCloseEvent}{wxcloseevent},\rtfsp
%%\helpref{wxApp::OnQueryEndSession}{wxapponqueryendsession}
+
\membersection{wxApp::OnInit}\label{wxapponinit}
\func{bool}{OnInit}{\void}
This must be provided by the application, and will usually create the
application's main window, optionally calling
-\helpref{wxApp::SetTopWindow}{wxappsettopwindow}.
+\helpref{wxApp::SetTopWindow}{wxappsettopwindow}. You may use
+\helpref{OnExit}{wxapponexit} 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
-wxWindows you have to call the base class version in the derived class
+wxWidgets you have to call the base class version in the derived class
OnInit().
-Return TRUE to continue processing, FALSE to exit the application.
+Return \true to continue processing, \false to exit the application
+immediately.
+
\membersection{wxApp::OnInitCmdLine}\label{wxapponinitcmdline}
parser with the command line options for this application. The base class
versions adds support for a few standard options only.
+
\membersection{wxApp::OnQueryEndSession}\label{wxapponqueryendsession}
\func{void}{OnQueryEndSession}{\param{wxCloseEvent\& }{event}}
about to close down. Typically, an application will try to save unsaved documents
at this point.
-If \helpref{wxCloseEvent::CanVeto}{wxcloseeventcanveto} returns TRUE, the application
+If \helpref{wxCloseEvent::CanVeto}{wxcloseeventcanveto} returns true, the application
is allowed to veto the shutdown by calling \helpref{wxCloseEvent::Veto}{wxcloseeventveto}.
The application might veto the shutdown after prompting for documents to be saved, and the
user has cancelled the save.
Use the EVT\_QUERY\_END\_SESSION event table macro to handle query end session events.
You should check whether the application is forcing the deletion of the window
-using \helpref{wxCloseEvent::GetForce}{wxcloseeventgetforce}. If this is TRUE,
+using \helpref{wxCloseEvent::GetForce}{wxcloseeventgetforce}. If this is true,
destroy the window using \helpref{wxWindow::Destroy}{wxwindowdestroy}.
If not, it is up to you whether you respond by destroying the window.
The default handler calls \helpref{wxWindow::Close}{wxwindowclose} on the top-level window,
-and vetoes the shutdown if Close returns FALSE. This will be sufficient for many applications.
+and vetoes the shutdown if Close returns false. This will be sufficient for many applications.
\wxheading{Remarks}
\wxheading{See also}
\helpref{wxWindow::Close}{wxwindowclose},\rtfsp
-\helpref{wxWindow::OnCloseWindow}{wxwindowonclosewindow},\rtfsp
-\helpref{wxCloseEvent}{wxcloseevent},\rtfsp
-\helpref{wxApp::OnEndSession}{wxapponendsession}
+\helpref{wxCloseEvent}{wxcloseevent}\rtfsp
+
+
+\membersection{wxApp::OnRun}\label{wxapponrun}
+
+\func{virtual int}{OnRun}{\void}
+
+This virtual function is where the execution of a program written in wxWidgets
+starts. The default implementation just enters the main loop and starts
+handling the events until it terminates, either because
+\helpref{ExitMainLoop}{wxappexitmainloop} has been explicitly called or because
+the last frame has been deleted and
+\helpref{GetExitOnFrameDelete}{wxappgetexitonframedelete} flag is \true (this
+is the default).
+
+The return value of this function becomes the exit code of the program, so it
+should return $0$ in case of successful termination.
+
+
+\membersection{wxApp::OnUnhandledException}\label{wxapponunhandledexception}
+
+\func{virtual void}{OnUnhandledException}{\void}
+
+This function is called when an unhandled C++ exception occurs inside
+\helpref{OnRun()}{wxapponrun} (the exceptions which occur during the program
+startup and shutdown might not be caught at all).
+Note that the exception type is lost by now, so if you want to really handle
+the exception you should override \helpref{OnRun()}{wxapponrun} and put a
+try/catch clause around the call to the base class version there.
+
\membersection{wxApp::ProcessMessage}\label{wxappprocessmessage}
-\func{bool}{ProcessMessage}{\param{MSG *}{msg}}
+\func{bool}{ProcessMessage}{\param{WXMSG *}{msg}}
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. The function returns TRUE if the message
-was processed, FALSE otherwise. If you use wxWindows with another class
+may wish to process it. The function returns true if the message
+was processed, false otherwise. If you use wxWidgets with another class
library with its own message loop, you should make sure that this
-function is called to allow wxWindows to receive messages. For example,
-to allow co-existance with the Microsoft Foundation Classes, override
+function is called to allow wxWidgets to receive messages. For example,
+to allow co-existence with the Microsoft Foundation Classes, override
the PreTranslateMessage function:
\begin{verbatim}
-// Provide wxWindows message loop compatibility
+// Provide wxWidgets message loop compatibility
BOOL CTheApp::PreTranslateMessage(MSG *msg)
{
- if (wxTheApp && wxTheApp->ProcessMessage(msg))
- return TRUE;
+ if (wxTheApp && wxTheApp->ProcessMessage((WXMSW *)msg))
+ return true;
else
return CWinApp::PreTranslateMessage(msg);
}
\end{verbatim}
+
\membersection{wxApp::Pending}\label{wxapppending}
\func{bool}{Pending}{\void}
-Returns TRUE if unprocessed events are in the window system event queue.
+Returns true if unprocessed events are in the window system event queue.
\wxheading{See also}
\helpref{wxApp::Dispatch}{wxappdispatch}
-\membersection{wxApp::SendIdleEvents}\label{wxappsendidleevents}
-
-\func{bool}{SendIdleEvents}{\void}
-Sends idle events to all top-level windows.
+\membersection{wxApp::SendIdleEvents}\label{wxappsendidleevents}
-\func{bool}{SendIdleEvents}{\param{wxWindow*}{ win}}
+\func{bool}{SendIdleEvents}{\param{wxWindow*}{ win}, \param{wxIdleEvent\& }{event}}
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.
+
\wxheading{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.
+If true is returned, more OnIdle processing is requested by one or more window.
\wxheading{See also}
-\helpref{wxApp::OnIdle}{wxapponidle}, \helpref{wxWindow::OnIdle}{wxwindowonidle}, \helpref{wxIdleEvent}{wxidleevent}
+\helpref{wxIdleEvent}{wxidleevent}
+
\membersection{wxApp::SetAppName}\label{wxappsetappname}
Sets the name of the application. The name may be used in dialogs
(for example by the document/view framework). A default name is set by
-wxWindows.
+wxWidgets.
\wxheading{See also}
\helpref{wxApp::GetAppName}{wxappgetappname}
+
\membersection{wxApp::SetAuto3D}\label{wxappsetauto3d}
\func{void}{SetAuto3D}{\param{const bool}{ auto3D}}
\wxheading{Parameters}
-\docparam{auto3D}{If TRUE, all controls will be created with 3D appearances unless
-overridden for a control or dialog. The default is TRUE}
+\docparam{auto3D}{If true, all controls will be created with 3D appearances unless
+overridden for a control or dialog. The default is true}
\wxheading{Remarks}
\helpref{wxApp::GetAuto3D}{wxappgetauto3d}
+
\membersection{wxApp::SetClassName}\label{wxappsetclassname}
\func{void}{SetClassName}{\param{const wxString\& }{name}}
\helpref{wxApp::GetClassName}{wxappgetclassname}
+
\membersection{wxApp::SetExitOnFrameDelete}\label{wxappsetexitonframedelete}
\func{void}{SetExitOnFrameDelete}{\param{bool}{ flag}}
\wxheading{Parameters}
-\docparam{flag}{If TRUE (the default), the application will exit when the top-level frame is
-deleted. If FALSE, the application will continue to run.}
+\docparam{flag}{If true (the default), the application will exit when the top-level frame is
+deleted. If false, the application will continue to run.}
+
+\wxheading{See also}
+
+\helpref{wxApp::GetExitOnFrameDelete}{wxappgetexitonframedelete},\\
+\helpref{wxApp shutdown overview}{wxappshutdownoverview}
+
\membersection{wxApp::SetTopWindow}\label{wxappsettopwindow}
\func{void}{SetTopWindow}{\param{wxWindow* }{window}}
Sets the `top' window. You can call this from within \helpref{wxApp::OnInit}{wxapponinit} to
-let wxWindows know which is the main window. You don't have to set the top window;
+let wxWidgets know which is the main window. You don't have to set the top window;
it is only a convenience so that (for example) certain dialogs without parents can use a
specific window as the top window. If no top window is specified by the application,
-wxWindows just uses the first frame or dialog in its top-level window list, when it
+wxWidgets just uses the first frame or dialog in its top-level window list, when it
needs to use the top window.
\wxheading{Parameters}
\helpref{wxApp::GetTopWindow}{wxappgettopwindow}, \helpref{wxApp::OnInit}{wxapponinit}
+
\membersection{wxApp::SetVendorName}\label{wxappsetvendorname}
\func{void}{SetVendorName}{\param{const wxString\& }{name}}
Sets the name of application's vendor. The name will be used
in registry access. A default name is set by
-wxWindows.
+wxWidgets.
\wxheading{See also}
\helpref{wxApp::GetVendorName}{wxappgetvendorname}
-\membersection{wxApp::GetStdIcon}\label{wxappgetstdicon}
-
-\func{virtual wxIcon}{GetStdIcon}{\param{int }{which}} const
-
-Returns the icons used by wxWindows internally, e.g. the ones used for
-message boxes. This function is used internally and
-can be overridden by the user to change the default icons.
-
-\wxheading{Parameters}
-
-\docparam{which}{One of the wxICON\_XXX specifies which icon to return.}
-
-See \helpref{wxMessageBox}{wxmessagebox} for a list of icon identifiers.
\membersection{wxApp::SetUseBestVisual}\label{wxappsetusebestvisual}
Allows the programmer to specify whether the application will use the best visual
on systems that support several visual on the same display. This is typically the
case under Solaris and IRIX, where the default visual is only 8-bit whereas certain
-appications are supposed to run in TrueColour mode.
+applications are supposed to run in TrueColour mode.
Note that this function has to be called in the constructor of the {\tt wxApp}
instance and won't have any effect when called later on.
\wxheading{Parameters}
-\docparam{flag}{If TRUE, the app will use the best visual.}
+\docparam{flag}{If true, the app will use the best visual.}
+
+
+\membersection{wxApp::HandleEvent}\label{wxapphandleevent}
+
+\constfunc{virtual void}{HandleEvent}{\param{wxEvtHandler}{ *handler}, \param{wxEventFunction}{ func}, \param{wxEvent\& }{event}}
+
+This function simply invokes the given method \arg{func} of the specified
+event handler \arg{handler} with the \arg{event} as parameter. It exists solely
+to allow to catch the C++ exceptions which could be thrown by all event
+handlers in the application in one place: if you want to do this, override this
+function in your wxApp-derived class and add try/catch clause(s) to it.
+
+
+\membersection{wxApp::Yield}\label{wxappyield}
+
+\func{bool}{Yield}{\param{bool}{ onlyIfNeeded = false}}
+
+Yields control to pending messages in the windowing system. 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 \helpref{::wxSafeYield}{wxsafeyield} for a better
+function.
+
+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 \helpref{wxLog::FlushActive}{wxlogflushactive}.
+
+Calling Yield() recursively is normally an error and an assert failure is
+raised in debug build if such situation is detected. However if the the
+{\it onlyIfNeeded} parameter is {\tt true}, the method will just silently
+return {\tt false} instead.
projects / wxWidgets.git / blobdiff