wxTimer Class Reference

#include </home/zeitlin/src/wx/github/interface/wx/timer.h>

Inheritance diagram for wxTimer:

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Detailed Description

The wxTimer class allows you to execute code at specified intervals.

Its precision is platform-dependent, but in general will not be better than 1ms nor worse than 1s.

There are three different ways to use this class:

• You may derive a new class from wxTimer and override the wxTimer::Notify member to perform the required action.
• You may redirect the notifications to any wxEvtHandler derived object by using the non-default constructor or wxTimer::SetOwner. Then use the EVT_TIMER macro to connect it to the event handler which will receive wxTimerEvent notifications.
• You may use a derived class and the EVT_TIMER macro to connect it to an event handler defined in the derived class. If the default constructor is used, the timer object will be its own owner object, since it is derived from wxEvtHandler.

In any case, you must start the timer with wxTimer::Start() after constructing it before it actually starts sending notifications. It can be stopped later with wxTimer::Stop().

注:

A timer can only be used from the main thread.

Library:  wxBase

Category:  Miscellaneous

参照:

wxStopWatch

Public Member Functions
	wxTimer ()
	Default constructor.
	wxTimer (wxEvtHandler *owner, int id=-1)
	Creates a timer and associates it with owner.
virtual	~wxTimer ()
	Destructor.
int	GetId () const
	Returns the ID of the events generated by this timer.
int	GetInterval () const
	Returns the current interval for the timer (in milliseconds).
wxEvtHandler *	GetOwner () const
	Returns the current owner of the timer.
bool	IsOneShot () const
	Returns true if the timer is one shot, i.e.
bool	IsRunning () const
	Returns true if the timer is running, false if it is stopped.
virtual void	Notify ()
	This member should be overridden by the user if the default constructor was used and SetOwner() wasn't called.
void	SetOwner (wxEvtHandler *owner, int id=-1)
	Associates the timer with the given owner object.
virtual bool	Start (int milliseconds=-1, bool oneShot=false)
	(Re)starts the timer.
virtual void	Stop ()
	Stops the timer.

List of all members.

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Constructor & Destructor Documentation

wxTimer::wxTimer

(

)

Default constructor.

If you use it to construct the object and don't call SetOwner() later, you must override Notify() method to process the notifications.

wxTimer::wxTimer	(	wxEvtHandler *	owner,
		int	id = -1
	)

Creates a timer and associates it with owner.

Please see SetOwner() for the description of parameters.

virtual wxTimer::~wxTimer

(

)

[virtual]

Destructor.

Stops the timer if it is running.

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Member Function Documentation

int wxTimer::GetId

(

)

const

Returns the ID of the events generated by this timer.

int wxTimer::GetInterval

(

)

const

Returns the current interval for the timer (in milliseconds).

wxEvtHandler* wxTimer::GetOwner

(

)

const

Returns the current owner of the timer.

If non-NULL this is the event handler which will receive the timer events (see wxTimerEvent) when the timer is running.

bool wxTimer::IsOneShot

(

)

const

Returns true if the timer is one shot, i.e.

if it will stop after firing the first notification automatically.

bool wxTimer::IsRunning

(

)

const

Returns true if the timer is running, false if it is stopped.

virtual void wxTimer::Notify

(

)

[virtual]

This member should be overridden by the user if the default constructor was used and SetOwner() wasn't called.

Perform whatever action which is to be taken periodically here.

Notice that throwing exceptions from this method is currently not supported, use event-based timer handling approach if an exception can be thrown while handling timer notifications.

void wxTimer::SetOwner	(	wxEvtHandler *	owner,
		int	id = -1
	)

Associates the timer with the given owner object.

When the timer is running, the owner will receive timer events (see wxTimerEvent) with id equal to id specified here.

virtual bool wxTimer::Start	(	int	milliseconds = -1,
		bool	oneShot = false
	)		[virtual]

(Re)starts the timer.

If milliseconds parameter is -1 (value by default), the previous value is used. Returns false if the timer could not be started, true otherwise (in MS Windows timers are a limited resource).

If oneShot is false (the default), the Notify() function will be called repeatedly until the timer is stopped. If true, it will be called only once and the timer will stop automatically.

To make your code more readable you may also use the following symbolic constants:

• wxTIMER_CONTINUOUS: Start a normal, continuously running, timer
• wxTIMER_ONE_SHOT: Start a one shot timer If the timer was already running, it will be stopped by this method before restarting it.

virtual void wxTimer::Stop

(

)

[virtual]

Stops the timer.