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swing:buttons
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swing:buttons [2015/05/11 04:44] gthanos [Η κλάση JButton] |
swing:buttons [2018/03/27 16:31] gthanos |
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| ====== Buttons, Check Boxes & Radio Buttons ====== | ====== Buttons, Check Boxes & Radio Buttons ====== | ||
| - | Για την δημιουργία ενός button μπορείτε να χρησιμοποιήσετε μία κλάση από τις απογόνους της κλάσης [[https:// | + | Για την δημιουργία ενός button μπορείτε να χρησιμοποιήσετε μία κλάση από τις απογόνους της κλάσης [[https:// |
| - | ή [[https:// | + | ή [[https:// |
| - | ===== Η κλάση JButton ===== | + | * [[swing: |
| + | * [[swing: | ||
| + | * [[swing: | ||
| - | Δείτε, μεταγλωττίστε και τρέξτε το παρακάτω παράδειγμα από το site της Oracle, το οποίο και θα συζητήσουμε στη συνέχεια. | ||
| - | <code java> | ||
| - | package components; | ||
| - | import javax.swing.AbstractButton; | ||
| - | import javax.swing.JButton; | ||
| - | import javax.swing.JPanel; | ||
| - | import javax.swing.JFrame; | ||
| - | import javax.swing.ImageIcon; | ||
| - | |||
| - | import java.awt.event.ActionEvent; | ||
| - | import java.awt.event.ActionListener; | ||
| - | import java.awt.event.KeyEvent; | ||
| - | |||
| - | /* | ||
| - | * ButtonDemo.java requires the following files: | ||
| - | | ||
| - | | ||
| - | | ||
| - | */ | ||
| - | public class ButtonDemo extends JPanel | ||
| - | implements ActionListener { | ||
| - | protected JButton b1, b2, b3; | ||
| - | |||
| - | public ButtonDemo() { | ||
| - | ImageIcon leftButtonIcon = createImageIcon(" | ||
| - | ImageIcon middleButtonIcon = createImageIcon(" | ||
| - | ImageIcon rightButtonIcon = createImageIcon(" | ||
| - | |||
| - | b1 = new JButton(" | ||
| - | b1.setVerticalTextPosition(AbstractButton.CENTER); | ||
| - | b1.setHorizontalTextPosition(AbstractButton.LEADING); | ||
| - | b1.setMnemonic(KeyEvent.VK_D); | ||
| - | b1.setActionCommand(" | ||
| - | |||
| - | b2 = new JButton(" | ||
| - | b2.setVerticalTextPosition(AbstractButton.BOTTOM); | ||
| - | b2.setHorizontalTextPosition(AbstractButton.CENTER); | ||
| - | b2.setMnemonic(KeyEvent.VK_M); | ||
| - | |||
| - | b3 = new JButton(" | ||
| - | //Use the default text position of CENTER, TRAILING (RIGHT). | ||
| - | b3.setMnemonic(KeyEvent.VK_E); | ||
| - | b3.setActionCommand(" | ||
| - | b3.setEnabled(false); | ||
| - | |||
| - | //Listen for actions on buttons 1 and 3. | ||
| - | b1.addActionListener(this); | ||
| - | b3.addActionListener(this); | ||
| - | |||
| - | b1.setToolTipText(" | ||
| - | b2.setToolTipText(" | ||
| - | b3.setToolTipText(" | ||
| - | |||
| - | //Add Components to this container, using the default FlowLayout. | ||
| - | add(b1); | ||
| - | add(b2); | ||
| - | add(b3); | ||
| - | } | ||
| - | |||
| - | public void actionPerformed(ActionEvent e) { | ||
| - | if (" | ||
| - | b2.setEnabled(false); | ||
| - | b1.setEnabled(false); | ||
| - | b3.setEnabled(true); | ||
| - | } else { | ||
| - | b2.setEnabled(true); | ||
| - | b1.setEnabled(true); | ||
| - | b3.setEnabled(false); | ||
| - | } | ||
| - | } | ||
| - | |||
| - | /** Returns an ImageIcon, or null if the path was invalid. */ | ||
| - | protected static ImageIcon createImageIcon(String path) { | ||
| - | java.net.URL imgURL = ButtonDemo.class.getResource(path); | ||
| - | if (imgURL != null) { | ||
| - | return new ImageIcon(imgURL); | ||
| - | } else { | ||
| - | System.err.println(" | ||
| - | 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(" | ||
| - | frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); | ||
| - | |||
| - | //Create and set up the content pane. | ||
| - | ButtonDemo newContentPane = new ButtonDemo(); | ||
| - | newContentPane.setOpaque(true); | ||
| - | frame.setContentPane(newContentPane); | ||
| - | |||
| - | //Display the window. | ||
| - | frame.pack(); | ||
| - | frame.setVisible(true); | ||
| - | } | ||
| - | |||
| - | public static void main(String[] args) { | ||
| - | //Schedule a job for the event-dispatching thread: | ||
| - | //creating and showing this application' | ||
| - | javax.swing.SwingUtilities.invokeLater(new Runnable() { | ||
| - | public void run() { | ||
| - | createAndShowGUI(); | ||
| - | } | ||
| - | }); | ||
| - | } | ||
| - | } | ||
| - | </ | ||
| - | Το παραπάνω παράδειγμα απαιτεί την χρήση των παρακάτω εικόνων {{: | ||
| - | - Κάθε button μπορεί να περιέχει κείμενο και ένα εικονίδιο σε αναλογία με τα αντικείμενα τύπου JLabel. Επίσης μπορεί να περιέχει και HTML όπως και τα JLabel (δεν εμφανίζεται στο παραπάνω παράδειγμα). | ||
| - | - Για κάθε Button οφείλουμε να ορίσουμε τουλάχιστον ένα ActionListener αντικείμενο. | ||
| - | - Κάθε Button μπορεί να συνδέεται με ένα //keyboard shortcut//. Για να ορίσετε ένα keyboard shortcut χρησιμοποιήστε τη μέθοδο '' | ||
swing/buttons.txt · Last modified: 2018/03/27 19:38 (external edit)
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