Example usage for javax.swing JInternalFrame addVetoableChangeListener

Introduction

In this page you can find the example usage for javax.swing JInternalFrame addVetoableChangeListener.

Prototype

public synchronized void addVetoableChangeListener(VetoableChangeListener listener) 

Source Link

Document

Adds a VetoableChangeListener to the listener list.

Usage

From source file:VetoableChangeListenerDemo.java

public static void main(final String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JDesktopPane desktop = new JDesktopPane();

    JInternalFrame palette = new JInternalFrame("Palette", true, true, true, true);

    palette.addVetoableChangeListener(new IconPolice());

    palette.setBounds(350, 150, 100, 100);
    desktop.add(palette, JDesktopPane.PALETTE_LAYER);
    palette.setVisible(true);// w  ww. j  a v a  2s.co m

    frame.add(desktop, BorderLayout.CENTER);
    frame.setSize(500, 300);
    frame.setVisible(true);
}

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From source file:InternalFrameTest.java

/**
 * Creates an internal frame on the desktop.
 * @param c the component to display in the internal frame
 * @param t the title of the internal frame.
 *//* w  w  w  .j  a va2 s.co m*/
public void createInternalFrame(Component c, String t) {
    final JInternalFrame iframe = new JInternalFrame(t, true, // resizable
            true, // closable
            true, // maximizable
            true); // iconifiable

    iframe.add(c, BorderLayout.CENTER);
    desktop.add(iframe);

    iframe.setFrameIcon(new ImageIcon("document.gif"));

    // add listener to confirm frame closing
    iframe.addVetoableChangeListener(new VetoableChangeListener() {
        public void vetoableChange(PropertyChangeEvent event) throws PropertyVetoException {
            String name = event.getPropertyName();
            Object value = event.getNewValue();

            // we only want to check attempts to close a frame
            if (name.equals("closed") && value.equals(true)) {
                // ask user if it is ok to close
                int result = JOptionPane.showInternalConfirmDialog(iframe, "OK to close?", "Select an Option",
                        JOptionPane.YES_NO_OPTION);

                // if the user doesn't agree, veto the close
                if (result != JOptionPane.YES_OPTION)
                    throw new PropertyVetoException("User canceled close", event);
            }
        }
    });

    // position frame
    int width = desktop.getWidth() / 2;
    int height = desktop.getHeight() / 2;
    iframe.reshape(nextFrameX, nextFrameY, width, height);

    iframe.show();

    // select the frame--might be vetoed
    try {
        iframe.setSelected(true);
    } catch (PropertyVetoException e) {
    }

    frameDistance = iframe.getHeight() - iframe.getContentPane().getHeight();

    // compute placement for next frame

    nextFrameX += frameDistance;
    nextFrameY += frameDistance;
    if (nextFrameX + width > desktop.getWidth())
        nextFrameX = 0;
    if (nextFrameY + height > desktop.getHeight())
        nextFrameY = 0;
}

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