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--- swing:menus_checkboxes_radio [2018/03/27 19:21]
+++ swing:menus_checkboxes_radio [2018/03/27 20:19]
gthanos
@@ 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.
+Για την εκτέλεση του παρακάτω κώδικα θα χρειαστείτε το εικονίδιο [[https://docs.oracle.com/javase/tutorial/uiswing/examples/components/MenuLookDemoProject/src/components/images/middle.gif|middle.gif]].
+<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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