f6bcfd974e
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
160 lines
4.5 KiB
TeX
160 lines
4.5 KiB
TeX
\section{\class{wxTimer}}\label{wxtimer}
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The wxTimer class allows you to execute code at specified intervals. Its
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precision is platform-dependent, but in general will not be better than 1ms nor
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worse than 1s.
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There are two different ways to use this class:
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\begin{enumerate}
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\item You may derive a new class from wxTimer and override the
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\helpref{Notify}{wxtimernotify} member to perform the required action.
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\item Or you may redirect the notifications to any
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\helpref{wxEvtHandler}{wxevthandler} derived object by using the non default
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constructor or \helpref{SetOwner}{wxtimersetowner}. Then use {\tt EVT\_TIMER}
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macro to connect it to the event handler which will receive
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\helpref{wxTimerEvent}{wxtimerevent} notifications.
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\end{enumerate}
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In any case, you must start the timer with \helpref{Start}{wxtimerstart}
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after constructing it before it actually starts sending notifications. It can
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be stopped later with \helpref{Stop}{wxtimerstop}.
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/timer.h>
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\wxheading{See also}
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\helpref{::wxStartTimer}{wxstarttimer}, \helpref{::wxGetElapsedTime}{wxgetelapsedtime}, \helpref{wxStopWatch}{wxstopwatch}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxTimer::wxTimer}\label{wxtimerwxtimer}
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\func{}{wxTimer}{\void}
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Default constructor. If you use it to construct the object and don't call
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\helpref{SetOwner}{wxtimersetowner} later, you must override
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\helpref{Notify}{wxtimernotify} method to process the notifications.
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\func{}{wxTimer}{\param{wxEvtHandler *}{owner}, \param{int }{id = -1}}
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Creates a timer and associates it with {\it owner}. Please see
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\helpref{SetOwner}{wxtimersetowner} for the description of parameters.
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\membersection{wxTimer::\destruct{wxTimer}}
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\func{}{\destruct{wxTimer}}{\void}
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Destructor. Stops the timer if it is running.
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\membersection{wxTimer::GetInterval}{wxtimergetinterval}
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\constfunc{int}{GetInterval}{\void}
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Returns the current interval for the timer (in milliseconds).
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\membersection{wxTimer::IsOneShot}\label{wxtimerisoneshot}
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\constfunc{bool}{IsOneShot}{\void}
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Returns TRUE if the timer is one shot, i.e. if it will stop after firing the
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first notification automatically.
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\membersection{wxTimer::IsRunning}\label{wxtimerisrunning}
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\constfunc{bool}{IsRunning}{\void}
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Returns TRUE if the timer is running, FALSE if it is stopped.
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\membersection{wxTimer::Notify}\label{wxtimernotify}
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\func{void}{Notify}{\void}
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This member should be overridden by the user if the default constructor was
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used and \helpref{SetOwner}{wxtimersetowner} wasn't called.
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Perform whatever action which is to be taken periodically here.
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\membersection{wxTimer::SetOwner}\label{wxtimersetowner}
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\func{void}{SetOwner}{\param{wxEvtHandler *}{owner}, \param{int }{id = -1}}
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Associates the timer with the given {\it owner} object. When the timer is
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running, the owner will receive \helpref{timer events}{wxtimerevent} with
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id equal to {\it id} specified here.
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\membersection{wxTimer::Start}\label{wxtimerstart}
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\func{bool}{Start}{\param{int}{ milliseconds = -1}, \param{bool}{ oneShot=FALSE}}
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(Re)starts the timer. If {\it milliseconds} parameter is -1 (value by default),
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the previous value is used. Returns FALSE if the timer could not be started,
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TRUE otherwise (in MS Windows timers are a limited resource).
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If {\it oneShot} is FALSE (the default), the \helpref{Notify}{wxtimernotify}
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function will be called repeatedly until the timer is stopped. If TRUE,
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it will be called only once and the timer will stop automatically.
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\membersection{wxTimer::Stop}\label{wxtimerstop}
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\func{void}{Stop}{\void}
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Stops the timer.
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\section{\class{wxTimerEvent}}\label{wxtimerevent}
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wxTimerEvent object is passed to the event handler of timer events.
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For example:
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\begin{verbatim}
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class MyFrame : public wxFrame
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{
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public:
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...
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void OnTimer(wxTimerEvent& event);
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private:
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wxTimer m_timer;
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};
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BEGIN_EVENT_TABLE(MyFrame, wxFrame)
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EVT_TIMER(TIMER_ID, MyFrame::OnTimer)
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END_EVENT_TABLE()
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MyFrame::MyFrame()
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: m_timer(this, TIMER_ID)
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{
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m_timer.Start(1000); // 1 second interval
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}
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void MyFrame::OnTimer(wxTimerEvent& event)
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{
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// do whatever you want to do every second here
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}
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\end{verbatim}
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\wxheading{Include files}
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<wx/timer.h>
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\wxheading{See also}
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\helpref{wxTimer}{wxtimer}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxTimerEvent::GetInterval}\label{wxtimereventgetinterval}
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\constfunc{int}{GetInterval}{\void}
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Returns the interval of the timer which generated this event.
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