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--- swing:menus_checkboxes_radio [2018/03/27 17:33]
gthanos
+++ swing:menus_checkboxes_radio [2018/03/27 19:21]
@@ Line 1: / Line 1: @@
-====== CheckBox Menu Items & RadioButton Menu Items ======
-Σε αναλογία με τα check box buttons και radio buttons μπορείτε να ορίσετε σε ένα μενού //CheckBox Menu Items// και //RadioButton Menu Items//. Δείτε το παρακάτω παράδειγμα χρήσης ενός τέτοιου μενού από το site της Oracle.
-<code java MenuLookDemo.java>
-import java.awt.*;
-import java.awt.event.*;
-import javax.swing.JMenu;
-import javax.swing.JMenuItem;
-import javax.swing.JCheckBoxMenuItem;
-import javax.swing.JRadioButtonMenuItem;
-import javax.swing.ButtonGroup;
-import javax.swing.JMenuBar;
-import javax.swing.KeyStroke;
-import javax.swing.ImageIcon;
-import javax.swing.JPanel;
-import javax.swing.JTextArea;
-import javax.swing.JScrollPane;
-import javax.swing.JFrame;
-/* MenuLookDemo.java requires images/middle.gif. */
-/*
- * This class exists solely to show you what menus look like.
- * It has no menu-related event handling.
- */
-public class MenuLookDemo {
-  JTextArea output;
-  JScrollPane scrollPane;
-  public JMenuBar createMenuBar() {
-    JMenuBar menuBar;
-    JMenu menu, submenu;
-    JMenuItem menuItem;
-    JRadioButtonMenuItem rbMenuItem;
-    JCheckBoxMenuItem cbMenuItem;
-    //Create the menu bar.
-    menuBar = new JMenuBar();
-    //Build the first menu.
-    menu = new JMenu("A Menu");
-    menu.setMnemonic(KeyEvent.VK_A);
-    menu.getAccessibleContext().setAccessibleDescription(
-        "The only menu in this program that has menu items");
-    menuBar.add(menu);
-    //a group of JMenuItems
-    menuItem = new JMenuItem("A text-only menu item",
-                 KeyEvent.VK_T);
-    //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead
-    menuItem.setAccelerator(KeyStroke.getKeyStroke(
-        KeyEvent.VK_1, ActionEvent.ALT_MASK));
-    menuItem.getAccessibleContext().setAccessibleDescription(
-        "This doesn't really do anything");
-    menu.add(menuItem);
-    ImageIcon icon = createImageIcon("images/middle.gif");
-    menuItem = new JMenuItem("Both text and icon", icon);
-    menuItem.setMnemonic(KeyEvent.VK_B);
-    menu.add(menuItem);
-    menuItem = new JMenuItem(icon);
-    menuItem.setMnemonic(KeyEvent.VK_D);
-    menu.add(menuItem);
-    //a group of radio button menu items
-    menu.addSeparator();
-    ButtonGroup group = new ButtonGroup();
-    rbMenuItem = new JRadioButtonMenuItem("A radio button menu item");
-    rbMenuItem.setSelected(true);
-    rbMenuItem.setMnemonic(KeyEvent.VK_R);
-    group.add(rbMenuItem);
-    menu.add(rbMenuItem);
-    rbMenuItem = new JRadioButtonMenuItem("Another one");
-    rbMenuItem.setMnemonic(KeyEvent.VK_O);
-    group.add(rbMenuItem);
-    menu.add(rbMenuItem);
-    //a group of check box menu items
-    menu.addSeparator();
-    cbMenuItem = new JCheckBoxMenuItem("A check box menu item");
-    cbMenuItem.setMnemonic(KeyEvent.VK_C);
-    menu.add(cbMenuItem);
-    cbMenuItem = new JCheckBoxMenuItem("Another one");
-    cbMenuItem.setMnemonic(KeyEvent.VK_H);
-    menu.add(cbMenuItem);
-    //a submenu
-    menu.addSeparator();
-    submenu = new JMenu("A submenu");
-    submenu.setMnemonic(KeyEvent.VK_S);
-    menuItem = new JMenuItem("An item in the submenu");
-    menuItem.setAccelerator(KeyStroke.getKeyStroke(
-        KeyEvent.VK_2, ActionEvent.ALT_MASK));
-    submenu.add(menuItem);
-    menuItem = new JMenuItem("Another item");
-    submenu.add(menuItem);
-    menu.add(submenu);
-    //Build second menu in the menu bar.
-    menu = new JMenu("Another Menu");
-    menu.setMnemonic(KeyEvent.VK_N);
-    menu.getAccessibleContext().setAccessibleDescription(
-        "This menu does nothing");
-    menuBar.add(menu);
-    return menuBar;
-  }
-  public Container createContentPane() {
-    //Create the content-pane-to-be.
-    JPanel contentPane = new JPanel(new BorderLayout());
-    contentPane.setOpaque(true);
-    //Create a scrolled text area.
-    output = new JTextArea(5, 30);
-    output.setEditable(true);
-    scrollPane = new JScrollPane(output);
-    //Add the text area to the content pane.
-    contentPane.add(scrollPane, BorderLayout.CENTER);
-    return contentPane;
-  }
-  /** Returns an ImageIcon, or null if the path was invalid. */
-  protected static ImageIcon createImageIcon(String path) {
-    java.net.URL imgURL = MenuLookDemo.class.getResource(path);
-    if (imgURL != null) {
-      return new ImageIcon(imgURL);
-    } else {
-      System.err.println("Couldn't find file: " + path);
-      return null;
-    }
-  }
-  /**
-   * Create the GUI and show it.  For thread safety,
-   * this method should be invoked from the
-   * event-dispatching thread.
-   */
-  private static void createAndShowGUI() {
-    //Create and set up the window.
-    JFrame frame = new JFrame("MenuLookDemo");
-    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-    //Create and set up the content pane.
-    MenuLookDemo demo = new MenuLookDemo();
-    frame.setJMenuBar(demo.createMenuBar());
-    frame.setContentPane(demo.createContentPane());
-    //Display the window.
-    frame.setSize(450, 260);
-    frame.setVisible(true);
-  }
-  public static void main(String[] args) {
-    //Schedule a job for the event-dispatching thread:
-    //creating and showing this application's GUI.
-    javax.swing.SwingUtilities.invokeLater(new Runnable() {
-      public void run() {
-        createAndShowGUI();
-      }
-    });
-  }
-}
-</code>

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