AlignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] 显示已更改的组件： javax.swing.JPanel[，0,0484x461，隐藏，布局=java.awt.BorderLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] 组件更改： javax.swing.JPanel[，0,0484x461，隐藏，布局=java.awt.BorderLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] 显示已更改的组件： javax.swing.JPanel[，0,0484x461，隐藏，布局=java.awt.BorderLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] CardlayoutTest.EventHandler.ancestorRemoved（）javax.swing.JPanel--- 隐藏javax.swing.JPanel---隐藏
CardlayoutTest.EventHandler.ancestorAdded（）AlignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] 显示已更改的组件： javax.swing.JPanel[，0,0484x461，隐藏，布局=java.awt.BorderLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] 组件更改： javax.swing.JPanel[，0,0484x461，隐藏，布局=java.awt.BorderLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] 显示已更改的组件： javax.swing.JPanel[，0,0484x461，隐藏，布局=java.awt.BorderLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=] CardlayoutTest.EventHandler.ancestorRemoved（）javax.swing.JPanel--- 隐藏javax.swing.JPanel---隐藏,java,swing,Java,Swing,CardlayoutTest.EventHandler.ancestorAdded（） 有三个侦听器对这些事件作出反应：AncestorListener、ComponentListener和HierarchyListener 默认情况下，ComponentListener是最佳选择 事件 CardlayoutTest.main（）---------------------------第一个组件更改： javax.swing.JPanel[，0,0,0x0，无效，layout=java.aw
- 有三个侦听器对这些事件作出反应：AncestorListener、ComponentListener和HierarchyListener
- 默认情况下，ComponentListener是最佳选择
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");
}
}
public class PanelTrial extends javax.swing.JPanel implements AncestorListener {
private Container frame;
private javax.swing.JPanel btnPanel;
public PanelTrial(Container frame) {
this.frame = frame;
initComponents();
createBtnPanel();
btnPanel.addAncestorListener(this);
}
// Called on btn click event - to show/hide btnPanel
private void updateRightPanel(boolean showBtnPanel) {
jPanel1.removeAll();
GroupLayout layout = (GroupLayout) jPanel1.getLayout();
if (showBtnPanel) {
layout.setHorizontalGroup(layout.createSequentialGroup()
.addComponent(btnPanel));
layout.setVerticalGroup(layout.createParallelGroup(
Alignment.TRAILING).addComponent(btnPanel));
} else {
layout.setHorizontalGroup(layout.createSequentialGroup()
.addComponent(rightPanel));
layout.setVerticalGroup(layout.createParallelGroup(
Alignment.TRAILING).addComponent(rightPanel));
}
jPanel1.validate();
this.validate();
}
@Override
public void ancestorAdded(AncestorEvent e) {
if (e.getSource() == btnPanel)
System.out.println("BTNSPANEL LOADED / ADDED");
}
@Override
public void ancestorMoved(AncestorEvent e) {
// This is of no use for your purpose
System.out.println("Anc Moved - " + e.getSource());
}
@Override
public void ancestorRemoved(AncestorEvent e) {
if (e.getSource() == btnPanel)
System.out.println("BTNSPANEL UNLOADED / REMOVED");
}