getAllFrames()
method "Returns the indicated frames as well as extended frames." On Mac OS X, marked frames may be ignored. The example below demonstrates the anomaly and uses List<JInternalFrame>
to compensate.
import java.awt.*; import java.awt.event.*; import java.beans.PropertyVetoException; import java.util.ArrayList; import java.util.List; import javax.swing.*; public class InternalFrameCount extends JFrame { private static final int SIZE = 300; private static final String ICONIFY = "Iconify"; private static final String RESTORE = "Restore"; private static final String COUNT = "Count:"; private JDesktopPane desktop = new JDesktopPane(); private JLabel count = new JLabel(COUNT); private List<JInternalFrame> list = new ArrayList<JInternalFrame>(); public InternalFrameCount() { desktop.add(createInternalFrame(1, Color.RED)); desktop.add(createInternalFrame(2, Color.GREEN)); desktop.add(createInternalFrame(3, Color.BLUE)); this.add(desktop); JPanel panel = new JPanel(); panel.add(new JButton(new ButtonAction(ICONIFY))); panel.add(new JButton(new ButtonAction(RESTORE))); panel.add(count); this.add(panel, BorderLayout.SOUTH); count.setText(COUNT + desktop.getAllFrames().length); } private class ButtonAction extends AbstractAction { private boolean iconify; public ButtonAction(String name) { super(name); iconify = ICONIFY.equals(name); } @Override public void actionPerformed(ActionEvent ae) { for (JInternalFrame jif : list) { try { jif.setIcon(iconify); } catch (PropertyVetoException e) { e.printStackTrace(System.err); } } count.setText(COUNT + desktop.getAllFrames().length); } } private JInternalFrame createInternalFrame(int number, Color background) { JInternalFrame jif = new JInternalFrame( "F" + number, true, true, true, true); list.add(jif); jif.setBackground(background); int topLeft = SIZE / 10 * number; jif.pack(); jif.setBounds(topLeft, topLeft, SIZE / 2, SIZE / 2); jif.setVisible(true); return jif; } public static void main(String args[]) throws PropertyVetoException { System.out.println(System.getProperty("os.name")); System.out.println(System.getProperty("java.runtime.version")); EventQueue.invokeLater(new Runnable() { @Override public void run() { InternalFrameCount frame = new InternalFrameCount(); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.pack(); frame.setSize(SIZE, SIZE); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } }
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