IlvTimer Class Reference

Timer class. More...

#include <ilviews/base/timer.h>

Inherited by IlvSharedTimer, and IlvSmartTimer.

Public Member Functions
	IlvTimer (IlvDisplay *display, int secs=1, int millis=0, IlvTimerProc proc=0, IlAny arg=0)
	Constructor. More...
virtual void	doIt ()
	Calls the internal function set in the constructor or by setProc. More...
IlvDisplay *	getDisplay () const
	Gets the display object. More...
IlUInt	getPeriod () const
	Gets the period of the object. More...
virtual IlBoolean	isRunning () const
	Indicates whether the timer is currently running. More...
virtual void	run ()
	Launches the timer. More...
virtual void	run (int secs, int millis=0)
	Launches the timer with a new time period. More...
IlBoolean	runOnce () const
	Checks the "run once" state of this timer. More...
void	runOnce (IlBoolean runOnce)
	Sets the "run once" state of this timer. More...
void	setProc (IlvTimerProc proc, IlAny arg=0)
	Sets the user-defined function that will be called when the timer wakes up. More...
virtual void	suspend ()
	Stops the timer. More...

Detailed Description

Timer class.

Library: display

Rogue Wave Views has an internal mechanism for implementing timers. The internal mechanism is hidden and system-dependent. It is based on the IlvTimer class.
The purpose of a timer is to call a function repeatedly, once every given time period. To call a function this way, create an IlvTimer instance and call its member function run. The timer object calls its member function doIt each time the period expires. Timers are based on the time-out mechanisms of the display system. The timer automatically repeats the call to doIt after every period if the timer is not specified to run only once. The IlvTimer class can be used in two different cases:

• The first case supposes you have a user-defined function that must match the IlvTimerProc type. In this case, you simply instantiate an IlvTimer object, specifying this function, and an argument the function can use.
• The second case uses a derived subclass of IlvTimer with overloading of the member function doIt.

A timer is attached to an instance of the IlvDisplay class.

See Also

IlvTimerProc.

Constructor & Destructor Documentation

IlvTimer::IlvTimer	(	IlvDisplay *	display,
		int	secs = 1,
		int	millis = 0,
		IlvTimerProc	proc = 0,
		IlAny	arg = 0
	)

Constructor.

Initializes a new timer for a given display.

Parameters

display	The display instance of this timer.
secs	The number of seconds of this timer's period.
millis	The number of milliseconds of this timer's period.
proc	The procedure that is called regularly.
arg	A user argument sent to proc.

Member Function Documentation

virtual void IlvTimer::doIt ( )

virtual

Calls the internal function set in the constructor or by setProc.

This is the virtual member function that is called when the timer is running. Its default implementation consists of calling the internal function that you may have set in the constructor call or in a call to the member function setProc. You can also overload this member function to define your own implementation.

IlvDisplay* IlvTimer::getDisplay

(

)

const

Gets the display object.

Returns

A pointer to the IlvDisplay object for which this object was created.

IlUInt IlvTimer::getPeriod

(

)

const

Gets the period of the object.

Returns

The period of the object in milliseconds.

virtual IlBoolean IlvTimer::isRunning ( ) const

virtual

Indicates whether the timer is currently running.

An IlBoolean value that indicates whether the timer is currently running.

Returns

IlTrue if the timer is currently running. If IlFalse, the timer is suspended.

virtual void IlvTimer::run ( )

virtual

Launches the timer.

Launches the timer with its internal time period.

virtual void IlvTimer::run ( int  secs, int  millis = 0  )

virtual

Launches the timer with a new time period.

Lets you specify a new period which is ( 1000 × secs + millis ), in milliseconds. Then it launches the timer.

Parameters

secs	The number of seconds of the period.
millis	The number of milliseconds added to the period.

IlBoolean IlvTimer::runOnce

(

)

const

Checks the "run once" state of this timer.

If the "run once" state is set to IlTrue, the timer will not be rearmed when called. This means that it will run only once. However, after the first call to doIt is complete-and you do not need the timer anymore-you need to delete it.

void IlvTimer::runOnce

(

IlBoolean

runOnce

)

Sets the "run once" state of this timer.

Parameters

runOnce

The new "run once" state.

void IlvTimer::setProc	(	IlvTimerProc	proc,
		IlAny	arg = 0
	)

Sets the user-defined function that will be called when the timer wakes up.

Parameters

proc	Specifies the function to be called.
arg	Specifies a user-defined argument for the function.

virtual void IlvTimer::suspend ( )

virtual

Stops the timer.

Stops the timer. The object is still valid but is quiet.