Say I have a simple JFrame with a JTabbedPane containing 3 panels, and the second panel contains a JComponent. Is there a way the JComponent to be notified when "Tab 2" panel is removed from its container? My problem is that the JComponent may be deep in the hierarchy.
Obviously, I am looking for SWING solution here... :)
,'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''`.
| |
| ,----------Y....................... |
| | Tab 1 | Tab 2 | Tab 3 | |
| :..........: :..................................... |
| | | |
| | | |
| | | |
| | +--------------------+ | |
| | |Some JComponent here| | |
| | +--------------------+ | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| `-----------------------------------------------------------' |
`-----------------------------------------------------------------
I tried to do this with the ancestorRemoved(), but no luck... I am obviously doing something wrong...
PS. the ASCII art is made with JavE.
I'd be use ComponentListener for this job (CardLayout is so close, similar in compare with JTabbedPane), code example contains all related listeners (disclaimer --> notice blocking EDT works only as code example and in this form only)
Ancesor & HierarchyListener are little bit asynchronous, maybe there is your problem to catch proper event from AncestorListener
my question about similar issue
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
public class CardlayoutTest extends JFrame {
private static final long serialVersionUID = 1L;
public CardLayout card = new CardLayout();
public CardlayoutTest() {
JPanel pnlA = new JPanel(new BorderLayout());
pnlA.add(new JButton("A"), BorderLayout.CENTER);
JPanel pnlB = new JPanel(new BorderLayout());
pnlB.add(new JButton("B"), BorderLayout.CENTER);
JPanel pnlC = new JPanel(new BorderLayout());
pnlC.add(new JButton("C"), BorderLayout.CENTER);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(card);
add(pnlA, "A");
add(pnlB, "B");
add(pnlC, "C");
pnlA.addAncestorListener(new EventHandler());
pnlB.addAncestorListener(new EventHandler());
pnlC.addAncestorListener(new EventHandler());
pnlA.addHierarchyListener(new EventHandler());
pnlB.addHierarchyListener(new EventHandler());
pnlB.addHierarchyListener(new EventHandler());
pnlA.addComponentListener(new EventHandler());
pnlB.addComponentListener(new EventHandler());
pnlB.addComponentListener(new EventHandler());
}
class EventHandler implements AncestorListener, ComponentListener, HierarchyListener {
@Override
public void ancestorAdded(AncestorEvent event) {
System.out.println("CardlayoutTest.EventHandler.ancestorAdded()");
}
@Override
public void ancestorMoved(AncestorEvent event) {
System.out.println("CardlayoutTest.EventHandler.ancestorMoved()");
}
@Override
public void ancestorRemoved(AncestorEvent event) {
System.out.println("CardlayoutTest.EventHandler.ancestorRemoved()");
}
@Override
public void hierarchyChanged(HierarchyEvent e) {
System.out.println("Components Change: " + e.getChanged());
if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0) {
if (e.getComponent().isDisplayable()) {
System.out.println("Components DISPLAYABILITY_CHANGED : " + e.getChanged());
} else {
System.out.println("Components DISPLAYABILITY_CHANGED : " + e.getChanged());
}
}
if ((e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) {
if (e.getComponent().isDisplayable()) {
System.out.println("Components SHOWING_CHANGED : " + e.getChanged());
} else {
System.out.println("Components SHOWING_CHANGED : " + e.getChanged());
}
}
}
public void componentHidden(ComponentEvent e) {
System.out.println(e.getComponent().getClass().getName() + " --- Hidden");
}
public void componentMoved(ComponentEvent e) {
System.out.println(e.getComponent().getClass().getName() + " --- Moved");
}
public void componentResized(ComponentEvent e) {
System.out.println(e.getComponent().getClass().getName() + " --- Resized ");
}
public void componentShown(ComponentEvent e) {
System.out.println(e.getComponent().getClass().getName() + " --- Shown");
}
}
public static void main(String[] args) {
CardlayoutTest t = new CardlayoutTest();
t.setSize(500, 500);
System.out.println("CardlayoutTest.main()------------------------ FIRST");
t.card.show(t.getContentPane(), "A");
t.setVisible(true);
System.out.print("\n");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
}
System.out.println("CardlayoutTest.main()------------------------ SECOND");
t.card.show(t.getContentPane(), "B");
System.out.print("\n");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
}
System.out.println("CardlayoutTest.main()------------------------ THIRD");
t.card.show(t.getContentPane(), "C");
System.out.print("\n");
}
}