NAME¶

SoOneShotSensor — sensor for one-time only callbacks

INHERITS FROM¶

SoSensor > SoDelayQueueSensor > SoOneShotSensor

SYNOPSIS¶

#include <Inventor/sensors/SoOneShotSensor.h>

Methods from class SoOneShotSensor:

SoOneShotSensor()

SoOneShotSensor(SoSensorCB *func, void *data)

~SoOneShotSensor()

Methods from class SoDelayQueueSensor:

void setPriority(uint32_t pri)

uint32_t getPriority()

static uint32_t getDefaultPriority()

virtual void schedule()

virtual void unschedule()

virtual SbBool isScheduled()

Methods from class SoSensor:

void setFunction(SoSensorCB *callbackFunction)

SoSensorCB * getFunction() const

void setData(void *callbackData)

void * getData() const

DESCRIPTION¶

A one-shot sensor is triggered once after it is scheduled, when the delay queue is processed. Like all delay queue sensors, one-shot sensors with a non-zero priority are just added to the delay queue when scheduled; if they are scheduled again before the delay queue is processed nothing happens, and they are guaranteed to be called only once when the delay queue is processed. For example, a one-shot sensor whose callback function redraws the scene might be scheduled whenever the scene graph changes and whenever a window-system event reporting that the window changed size occurs. By using a one-shot, the scene will only be redrawn once even if a window-changed-size event occurs just after the scene graph is modified (or if several window-changed-size events occur in a row).

Calling schedule() in the callback function is a useful way of getting something to happen repeatedly as often as possible, while still handling events and timeouts.

A priority 0 one-shot sensor isn't very useful, since scheduling it is exactly the same as directly calling its callback function.

METHODS¶

SoOneShotSensor()

SoOneShotSensor(SoSensorCB *func, void *data)

Creation methods. The second method takes the callback function and data to be called when the sensor is triggered.

~SoOneShotSensor()

Destroys the sensor, freeing up any memory associated with it after unscheduling it.

SEE ALSO¶

SoIdleSensor, SoDelayQueueSensor