package altosui;
-import java.awt.*;
-import java.awt.event.*;
import javax.swing.*;
-import javax.swing.filechooser.FileNameExtensionFilter;
-import javax.swing.table.*;
-import java.io.*;
-import java.util.*;
-import java.text.*;
-import java.util.prefs.*;
-import java.util.concurrent.LinkedBlockingQueue;
+import org.altusmetrum.altoslib_2.*;
+import org.altusmetrum.altosuilib_1.*;
public class AltosFreqList extends JComboBox {
public void set_frequency(double new_frequency) {
int i;
+
+ if (new_frequency < 0) {
+ setVisible(false);
+ return;
+ }
+
for (i = 0; i < getItemCount(); i++) {
AltosFrequency f = (AltosFrequency) getItemAt(i);