juce::HighResolutionTimer Class Reference

A high-resolution periodic timer. More...

#include <juce_HighResolutionTimer.h>

Collaboration diagram for juce::HighResolutionTimer:

Classes
struct	Pimpl

Public Member Functions
virtual	~HighResolutionTimer ()
	Destructor. More...
int	getTimerInterval () const noexcept
	Returns the timer's interval. More...
virtual void	hiResTimerCallback ()=0
	The user-defined callback routine that actually gets called periodically. More...
bool	isTimerRunning () const noexcept
	Checks if the timer has been started. More...
void	startTimer (int intervalInMilliseconds)
	Starts the timer and sets the length of interval required. More...
void	stopTimer ()
	Stops the timer. More...

Protected Member Functions
	HighResolutionTimer ()
	Creates a HighResolutionTimer. More...

Private Attributes
std::unique_ptr< Pimpl >	pimpl

Detailed Description

A high-resolution periodic timer.

This provides accurately-timed regular callbacks. Unlike the normal Timer class, this one uses a dedicated thread, not the message thread, so is far more stable and precise.

You should only use this class in situations where you really need accuracy, because unlike the normal Timer class, which is very lightweight and cheap to start/stop, the HighResolutionTimer will use far more resources, and starting/stopping it may involve launching and killing threads.

See also

Timer

@tags{Core}

Constructor & Destructor Documentation

HighResolutionTimer()

juce::HighResolutionTimer::HighResolutionTimer ( )

protected

Creates a HighResolutionTimer.

When created, the timer is stopped, so use startTimer() to get it going.

~HighResolutionTimer()

virtual juce::HighResolutionTimer::~HighResolutionTimer ( )

virtual

Destructor.

Member Function Documentation

getTimerInterval()

int juce::HighResolutionTimer::getTimerInterval ( ) const

noexcept

Returns the timer's interval.

Returns

the timer's interval in milliseconds if it's running, or 0 if it's not.

hiResTimerCallback()

virtual void juce::HighResolutionTimer::hiResTimerCallback ( )

pure virtual

The user-defined callback routine that actually gets called periodically.

This will be called on a dedicated timer thread, so make sure your implementation is thread-safe!

It's perfectly ok to call startTimer() or stopTimer() from within this callback to change the subsequent intervals.

Referenced by juce::HighResolutionTimer::Pimpl::start().

isTimerRunning()

bool juce::HighResolutionTimer::isTimerRunning ( ) const

noexcept

Checks if the timer has been started.

Returns

true if the timer is running.

startTimer()

void juce::HighResolutionTimer::startTimer

(

int

intervalInMilliseconds

)

Starts the timer and sets the length of interval required.

If the timer is already started, this will reset its counter, so the time between calling this method and the next timer callback will not be less than the interval length passed in.

Parameters

intervalInMilliseconds

the interval to use (any values less than 1 will be rounded up to 1)

stopTimer()

void juce::HighResolutionTimer::stopTimer

(

)

Stops the timer.

This method may block while it waits for pending callbacks to complete. Once it returns, no more callbacks will be made. If it is called from the timer's own thread, it will cancel the timer after the current callback returns.

Member Data Documentation

pimpl

std::unique_ptr<Pimpl> juce::HighResolutionTimer::pimpl

private

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The documentation for this class was generated from the following file:

• juce_HighResolutionTimer.h