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1 | \section{\class{wxTimer}}\label{wxtimer} | |
2 | ||
3 | The wxTimer class allows you to execute code at specified intervals. Its | |
4 | precision is platform-dependent, but in general will not be better than 1ms nor | |
5 | worse than 1s. | |
6 | ||
7 | There are two different ways to use this class: | |
8 | ||
9 | \begin{enumerate} | |
10 | \item You may derive a new class from wxTimer and override the | |
11 | \helpref{Notify}{wxtimernotify} member to perform the required action. | |
12 | \item Or you may redirect the notifications to any | |
13 | \helpref{wxEvtHandler}{wxevthandler} derived object by using the non default | |
14 | constructor or \helpref{SetOwner}{wxtimersetowner}. Then use {\tt EVT\_TIMER} | |
15 | macro to connect it to the event handler which will receive | |
16 | \helpref{wxTimerEvent}{wxtimerevent} notifications. | |
17 | \end{enumerate} | |
18 | ||
19 | In any case, you must start the timer with \helpref{Start}{wxtimerstart} | |
20 | after constructing it before it actually starts sending notifications. It can | |
21 | be stopped later with \helpref{Stop}{wxtimerstop}. | |
22 | ||
23 | \wxheading{Derived from} | |
24 | ||
25 | \helpref{wxObject}{wxobject} | |
26 | ||
27 | \wxheading{Include files} | |
28 | ||
29 | <wx/timer.h> | |
30 | ||
31 | \wxheading{See also} | |
32 | ||
33 | \helpref{::wxStartTimer}{wxstarttimer}, \helpref{::wxGetElapsedTime}{wxgetelapsedtime}, \helpref{wxStopWatch}{wxstopwatch} | |
34 | ||
35 | \latexignore{\rtfignore{\wxheading{Members}}} | |
36 | ||
37 | \membersection{wxTimer::wxTimer}\label{wxtimerwxtimer} | |
38 | ||
39 | \func{}{wxTimer}{\void} | |
40 | ||
41 | Default constructor. If you use it to construct the object and don't call | |
42 | \helpref{SetOwner}{wxtimersetowner} later, you must override | |
43 | \helpref{Notify}{wxtimernotify} method to process the notifications. | |
44 | ||
45 | \func{}{wxTimer}{\param{wxEvtHandler *}{owner}, \param{int }{id = -1}} | |
46 | ||
47 | Creates a timer and associates it with {\it owner}. Please see | |
48 | \helpref{SetOwner}{wxtimersetowner} for the description of parameters. | |
49 | ||
50 | \membersection{wxTimer::\destruct{wxTimer}} | |
51 | ||
52 | \func{}{\destruct{wxTimer}}{\void} | |
53 | ||
54 | Destructor. Stops the timer if it is running. | |
55 | ||
56 | \membersection{wxTimer::GetInterval}{wxtimergetinterval} | |
57 | ||
58 | \constfunc{int}{GetInterval}{\void} | |
59 | ||
60 | Returns the current interval for the timer (in milliseconds). | |
61 | ||
62 | \membersection{wxTimer::IsOneShot}\label{wxtimerisoneshot} | |
63 | ||
64 | \constfunc{bool}{IsOneShot}{\void} | |
65 | ||
66 | Returns TRUE if the timer is one shot, i.e. if it will stop after firing the | |
67 | first notification automatically. | |
68 | ||
69 | \membersection{wxTimer::IsRunning}\label{wxtimerisrunning} | |
70 | ||
71 | \constfunc{bool}{IsRunning}{\void} | |
72 | ||
73 | Returns TRUE if the timer is running, FALSE if it is stopped. | |
74 | ||
75 | \membersection{wxTimer::Notify}\label{wxtimernotify} | |
76 | ||
77 | \func{void}{Notify}{\void} | |
78 | ||
79 | This member should be overridden by the user if the default constructor was | |
80 | used and \helpref{SetOwner}{wxtimersetowner} wasn't called. | |
81 | ||
82 | Perform whatever action which is to be taken periodically here. | |
83 | ||
84 | \membersection{wxTimer::SetOwner}\label{wxtimersetowner} | |
85 | ||
86 | \func{void}{SetOwner}{\param{wxEvtHandler *}{owner}, \param{int }{id = -1}} | |
87 | ||
88 | Associates the timer with the given {\it owner} object. When the timer is | |
89 | running, the owner will receive \helpref{timer events}{wxtimerevent} with | |
90 | id equal to {\it id} specified here. | |
91 | ||
92 | \membersection{wxTimer::Start}\label{wxtimerstart} | |
93 | ||
94 | \func{bool}{Start}{\param{int}{ milliseconds = -1}, \param{bool}{ oneShot=FALSE}} | |
95 | ||
96 | (Re)starts the timer. If {\it milliseconds} parameter is -1 (value by default), | |
97 | the previous value is used. Returns FALSE if the timer could not be started, | |
98 | TRUE otherwise (in MS Windows timers are a limited resource). | |
99 | ||
100 | If {\it oneShot} is FALSE (the default), the \helpref{Notify}{wxtimernotify} | |
101 | function will be called repeatedly until the timer is stopped. If TRUE, | |
102 | it will be called only once and the timer will stop automatically. | |
103 | ||
104 | If the timer was already running, it will be stopped by this method before | |
105 | restarting it. | |
106 | ||
107 | \membersection{wxTimer::Stop}\label{wxtimerstop} | |
108 | ||
109 | \func{void}{Stop}{\void} | |
110 | ||
111 | Stops the timer. | |
112 | ||
113 | \section{\class{wxTimerEvent}}\label{wxtimerevent} | |
114 | ||
115 | wxTimerEvent object is passed to the event handler of timer events. | |
116 | ||
117 | For example: | |
118 | ||
119 | \begin{verbatim} | |
120 | class MyFrame : public wxFrame | |
121 | { | |
122 | public: | |
123 | ... | |
124 | void OnTimer(wxTimerEvent& event); | |
125 | ||
126 | private: | |
127 | wxTimer m_timer; | |
128 | }; | |
129 | ||
130 | BEGIN_EVENT_TABLE(MyFrame, wxFrame) | |
131 | EVT_TIMER(TIMER_ID, MyFrame::OnTimer) | |
132 | END_EVENT_TABLE() | |
133 | ||
134 | MyFrame::MyFrame() | |
135 | : m_timer(this, TIMER_ID) | |
136 | { | |
137 | m_timer.Start(1000); // 1 second interval | |
138 | } | |
139 | ||
140 | void MyFrame::OnTimer(wxTimerEvent& event) | |
141 | { | |
142 | // do whatever you want to do every second here | |
143 | } | |
144 | ||
145 | \end{verbatim} | |
146 | ||
147 | \wxheading{Include files} | |
148 | ||
149 | <wx/timer.h> | |
150 | ||
151 | \wxheading{See also} | |
152 | ||
153 | \helpref{wxTimer}{wxtimer} | |
154 | ||
155 | \latexignore{\rtfignore{\wxheading{Members}}} | |
156 | ||
157 | \membersection{wxTimerEvent::GetInterval}\label{wxtimereventgetinterval} | |
158 | ||
159 | \constfunc{int}{GetInterval}{\void} | |
160 | ||
161 | Returns the interval of the timer which generated this event. | |
162 |