tim/prune/correlate/OptionsChangedListener.java

   1 package tim.prune.correlate;
   2
   3 import java.awt.event.ActionListener;
   4 import java.awt.event.ActionEvent;
   5 import java.awt.event.ItemEvent;
   6 import java.awt.event.ItemListener;
   7 import java.awt.event.KeyEvent;
   8 import java.awt.event.KeyListener;
   9
  10 /**
  11  * Helper class to listen for changed options on the PhotoCorrelator
  12  * Tightly coupled but only to ok button and preview function
  13  */
  14 public class OptionsChangedListener implements KeyListener, ActionListener, ItemListener, Runnable
  15 {
  16         /** Correlator object for callbacks */
  17         private PhotoCorrelator _correlator;
  18         /** Thread counter */
  19         private int _threadCount = 0;
  20
  21         /** Default delay time from change to preview trigger */
  22         private static final long PREVIEW_DELAY_TIME = 2500L;
  23
  24
  25         /**
  26          * Constructor
  27          * @param inCorrelator correlator object for callbacks
  28          */
  29         public OptionsChangedListener(PhotoCorrelator inCorrelator)
  30         {
  31                 _correlator = inCorrelator;
  32         }
  33
  34         /**
  35          * Respond to actions performed on control
  36          * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
  37          */
  38         public void actionPerformed(ActionEvent inEvent)
  39         {
  40                 optionsChanged();
  41         }
  42
  43         /**
  44          * Run method, called by separate thread(s)
  45          * @see java.lang.Runnable#run()
  46          */
  47         public void run()
  48         {
  49                 // Wait for a certain time
  50                 try {
  51                         Thread.sleep(PREVIEW_DELAY_TIME);
  52                 }
  53                 catch (InterruptedException ie) {}
  54                 _threadCount--;
  55                 if (_threadCount == 0) {
  56                         // trigger preview (false means automatic)
  57                         _correlator.createPreview(false);
  58                 }
  59         }
  60
  61         /**
  62          * Respond to key pressed event
  63          * @param inEvent event
  64          */
  65         public void keyPressed(KeyEvent inEvent)
  66         {
  67                 optionsChanged();
  68         }
  69
  70         /** Ignore key released events */
  71         public void keyReleased(KeyEvent inEvent) {}
  72
  73         /** Ignore key typed events */
  74         public void keyTyped(KeyEvent e) {}
  75
  76         /**
  77          * Respond to item change events (eg dropdown)
  78          * @see java.awt.event.ItemListener#itemStateChanged(java.awt.event.ItemEvent)
  79          */
  80         public void itemStateChanged(ItemEvent inEvent)
  81         {
  82                 if (inEvent.getStateChange() == ItemEvent.SELECTED) {
  83                         optionsChanged();
  84                 }
  85         }
  86
  87         /**
  88          * Trigger that an option has changed, whatever type
  89          */
  90         private void optionsChanged()
  91         {
  92                 // disable ok button
  93                 _correlator.disableOkButton();
  94                 // start new thread to trigger preview
  95                 _threadCount++;
  96                 new Thread(this).start();
  97         }
  98 }