+ AltosFrequency[] frequencies = new AltosFrequency[0];
+
+ int selected = -1;
+
+ LinkedList<ActionListener> action_listeners = new LinkedList<ActionListener>();
+
+ public void addActionListener(ActionListener listener) {
+ action_listeners.add(listener);
+ }
+
+ public void removeActionListener(ActionListener listener) {
+ action_listeners.remove(listener);
+ }
+
+ public void actionPerformed(ActionEvent ev) {
+ FreqEntry e = (FreqEntry) ev.getSource();
+ set_selected(e.frequency);
+ ActionEvent event = new ActionEvent(e.frequency, 0, "selected");
+ for (ActionListener l : action_listeners)
+ l.actionPerformed(event);
+ }
+
+ boolean label = true;
+
+ public void set_label(boolean label) {
+ this.label = label;
+ set_label();
+ }
+
+ private void set_label() {
+ String new_text = "";
+ if (0 <= selected && selected < frequencies.length) {
+ AltosFrequency frequency = frequencies[selected];
+ new_text = String.format("%s%7.3f MHz (%s) ▾",
+ label ? "Frequency: " : "",
+ frequency.frequency,
+ frequency.description);
+ }
+ setText(new_text);
+ }
+
+ private void set_selected(AltosFrequency frequency) {
+ for (int i = 0; i < frequencies.length; i++) {
+ if (frequencies[i].frequency == frequency.frequency) {
+ selected = i;
+ set_label();
+ }
+ }
+ }
+
+ private AltosFrequency get_selected() {
+ if (0 <= selected && selected < frequencies.length)
+ return frequencies[selected];
+ return null;
+ }
+
+ private void add(AltosFrequency add) {
+ int insert;
+
+ for (insert = 0; insert < frequencies.length; insert++) {
+ if (frequencies[insert].frequency == add.frequency)
+ return;
+ if (add.frequency < frequencies[insert].frequency)
+ break;
+ }
+
+ AltosFrequency[] new_frequencies = new AltosFrequency[frequencies.length + 1];
+
+ for (int before = 0; before < insert; before++)
+ new_frequencies[before] = frequencies[before];
+ new_frequencies[insert] = add;
+
+ for (int after = insert; after < frequencies.length; after++)
+ new_frequencies[after+1] = frequencies[after];
+
+ frequencies = new_frequencies;
+
+ FreqEntry e = new FreqEntry(add);
+ add(e, insert);
+ e.addActionListener(this);
+ }
+
+ private void remove(AltosFrequency remove) {
+ int delete;
+ for (delete = 0; delete < frequencies.length; delete++) {
+ if (frequencies[delete].frequency == remove.frequency)
+ break;
+ if (remove.frequency < frequencies[delete].frequency)
+ return;
+ }
+
+ remove(delete);
+
+ AltosFrequency[] new_frequencies = new AltosFrequency[frequencies.length - 1];
+
+ for (int before = 0; before < delete; before++)
+ new_frequencies[before] = frequencies[before];
+
+ for (int after = delete + 1; after < frequencies.length; after++)
+ new_frequencies[after-1] = frequencies[after];
+ frequencies = new_frequencies;
+ }
+