Application Techniques

Using Timers

How to use the timer control on a form.

About this technique



Java Client Techniques> General techniques for controls


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Related reading

See the chapter on the Form Designer in the Tools Guide

Starting the timer control   Top of page

In this example, you click on the text button btnStartTimer to set the value of the integer field fldTimerValue to 0 and to start the timer tmrUser. This button fires the TimerTicked event on the timer, which is coded to get the current value and increment it one unit. The running value is displayed in fldTimerValue.

This code is in the actionPerformed event for the btnStartTimer button.

  // Set the counter to 0 
  // Start the timer 

This code is in the timeIntervalExpired event of tmrUser Timer control.

  // Timer has ticked, so increment the counter by 1 
  fldTimerValue.setValue(fldTimerValue.getValue() + 1); 
  // Add a row to the trace list box to show that the timer has ticked 
  subfrmTrace.lbEventList.addRow("tmrUser => TimerTicked"); 

Stopping the timer control   Top of page

The timer resumes after each timeIntervalExpired event until you stop it. The following code uses the stopTimer() method to stop tmrUser.

This code is in the actionPerformed event of the btnStopTime button.

  // Stop the timer 

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