60 lines
1.7 KiB
Java
60 lines
1.7 KiB
Java
// ui/List.java
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// ©2016 MindView LLC: see Copyright.txt
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import javax.swing.*;
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import javax.swing.border.*;
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import javax.swing.event.*;
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import java.awt.*;
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import java.awt.event.*;
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import static onjava.SwingConsole.*;
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public class List extends JFrame {
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private String[] flavors = {
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"Chocolate", "Strawberry", "Vanilla Fudge Swirl",
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"Mint Chip", "Mocha Almond Fudge", "Rum Raisin",
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"Praline Cream", "Mud Pie"
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};
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private int count = 0;
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private DefaultListModel<String> lItems =
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new DefaultListModel<>();
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private JList<String> lst = new JList<>(lItems);
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private JTextArea t =
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new JTextArea(flavors.length, 20);
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private JButton b = new JButton("Add Item");
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private ActionListener bl = e -> {
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if(count < flavors.length) {
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lItems.add(0, flavors[count++]);
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} else {
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// Disable, since there are no more
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// flavors left to be added to the List
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b.setEnabled(false);
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}
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};
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private ListSelectionListener ll = e -> {
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if(e.getValueIsAdjusting()) return;
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t.setText("");
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for(Object item : lst.getSelectedValuesList())
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t.append(item + "\n");
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};
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public List() {
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t.setEditable(false);
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setLayout(new FlowLayout());
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// Create Borders for components:
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Border brd = BorderFactory.createMatteBorder(
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1, 1, 2, 2, Color.BLACK);
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lst.setBorder(brd);
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t.setBorder(brd);
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// Add the first four items to the List
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for(int i = 0; i < 4; i++)
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lItems.addElement(flavors[count++]);
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add(t);
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add(lst);
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add(b);
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// Register event listeners
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lst.addListSelectionListener(ll);
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b.addActionListener(bl);
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}
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public static void main(String[] args) {
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run(new List(), 250, 375);
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}
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}
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