我添加了一个名为MyEditorPanel的自定义面板，该面板将JPanel扩展到JTabbedPanel，并希望每个选项卡上都有一个关闭按钮，以便使用以下代码并使用ButtonTabbedComponent.java中的ButtonTabbedComponent.java
public void addTab(String name, String desc) {
MyEditorPane textEditorPane = new MyEditorPane(this, name, desc);
this.addTab(name, normal, textEditorPane, desc);
int i = this.getComponentCount() - 1;
textEditorPane.setTabCount(i);
this.setTabComponentAt(i, new ButtonTabComponent(this, normal, normalFont));
}
但是我想在关闭之前将文本保存在MyEditorPane中，如何在单击关闭按钮时获取要关闭的MyEditorPane
当我在JTabbedPane类中获得组件的名称时，它没有MyEditorPane类对象
@Override
public void remove(int index) {
Component component = this.getTabComponentAt(index);
if (component instanceof ButtonTabComponent) {
ButtonTabComponent tab = (ButtonTabComponent) component;
System.out.println("remove method called if : " + tab.getComponentCount());
component = tab.getComponent(0);
System.out.println("remove method called if : " + component.getClass().getName());
component = tab.getComponent(1);
System.out.println("remove method called if : " + component.getClass().getName());
JPanel pane = (JPanel) component;
Component[] components = pane.getComponents();
for (int i = 0, l = components.length; i < l; i++) {
System.out.println("remove method called for : " + components[i].getClass().getName());
}
super.remove(index);
}
}
方法删除的输出
remove method called if : 2
remove method called if : javax.swing.JLabel
remove method called if : javax.swing.JPanel
remove method called for : pkginterface.ButtonTabComponent$1
remove method called for : pkginterface.ButtonTabComponent$TabButton
最佳答案
因此，根据How to Use Tabbed Panes中的示例，您可以使用类似...
public void actionPerformed(ActionEvent e) {
int i = pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
Component comp = pane.getComponentAt(i);
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
System.out.println("Label text = " + label.getText());
switch (JOptionPane.showConfirmDialog(this, "Are you sure you want to close the \"" + pane.getTitleAt(i) + "\" tab?", "Close", JOptionPane.OK_CANCEL_OPTION)) {
case JOptionPane.OK_OPTION:
pane.remove(i);
break;
}
}
}
}
这使您可以确定已关闭的选项卡，找到充当选项卡视图的组件，询问用户是否要关闭此特定选项卡，并根据他们的反馈采取适当的措施
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.plaf.basic.BasicButtonUI;
public class TabComponentsDemo extends JFrame {
private final int tabNumber = 5;
private final JTabbedPane pane = new JTabbedPane();
private JMenuItem tabComponentsItem;
private JMenuItem scrollLayoutItem;
public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
//Turn off metal's use of bold fonts
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
new TabComponentsDemo("TabComponentsDemo").runTest();
}
});
}
public TabComponentsDemo(String title) {
super(title);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
initMenu();
add(pane);
}
public void runTest() {
pane.removeAll();
for (int i = 0; i < tabNumber; i++) {
String title = "Tab " + i;
pane.add(title, new JLabel(title));
initTabComponent(i);
}
tabComponentsItem.setSelected(true);
pane.setTabLayoutPolicy(JTabbedPane.WRAP_TAB_LAYOUT);
scrollLayoutItem.setSelected(false);
setSize(new Dimension(400, 200));
setLocationRelativeTo(null);
setVisible(true);
}
private void initTabComponent(int i) {
pane.setTabComponentAt(i,
new ButtonTabComponent(pane));
}
//Setting menu
private void initMenu() {
JMenuBar menuBar = new JMenuBar();
//create Options menu
tabComponentsItem = new JCheckBoxMenuItem("Use TabComponents", true);
tabComponentsItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_T, InputEvent.ALT_MASK));
tabComponentsItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < pane.getTabCount(); i++) {
if (tabComponentsItem.isSelected()) {
initTabComponent(i);
} else {
pane.setTabComponentAt(i, null);
}
}
}
});
scrollLayoutItem = new JCheckBoxMenuItem("Set ScrollLayout");
scrollLayoutItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.ALT_MASK));
scrollLayoutItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (pane.getTabLayoutPolicy() == JTabbedPane.WRAP_TAB_LAYOUT) {
pane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
} else {
pane.setTabLayoutPolicy(JTabbedPane.WRAP_TAB_LAYOUT);
}
}
});
JMenuItem resetItem = new JMenuItem("Reset JTabbedPane");
resetItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, InputEvent.ALT_MASK));
resetItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
runTest();
}
});
JMenu optionsMenu = new JMenu("Options");
optionsMenu.add(tabComponentsItem);
optionsMenu.add(scrollLayoutItem);
optionsMenu.add(resetItem);
menuBar.add(optionsMenu);
setJMenuBar(menuBar);
}
public static class ButtonTabComponent extends JPanel {
private final JTabbedPane pane;
public ButtonTabComponent(final JTabbedPane pane) {
//unset default FlowLayout' gaps
super(new FlowLayout(FlowLayout.LEFT, 0, 0));
if (pane == null) {
throw new NullPointerException("TabbedPane is null");
}
this.pane = pane;
setOpaque(false);
//make JLabel read titles from JTabbedPane
JLabel label = new JLabel() {
public String getText() {
int i = pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
return pane.getTitleAt(i);
}
return null;
}
};
add(label);
//add more space between the label and the button
label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
//tab button
JButton button = new TabButton();
add(button);
//add more space to the top of the component
setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
}
private class TabButton extends JButton implements ActionListener {
public TabButton() {
int size = 17;
setPreferredSize(new Dimension(size, size));
setToolTipText("close this tab");
//Make the button looks the same for all Laf's
setUI(new BasicButtonUI());
//Make it transparent
setContentAreaFilled(false);
//No need to be focusable
setFocusable(false);
setBorder(BorderFactory.createEtchedBorder());
setBorderPainted(false);
//Making nice rollover effect
//we use the same listener for all buttons
addMouseListener(buttonMouseListener);
setRolloverEnabled(true);
//Close the proper tab by clicking the button
addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
int i = pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
Component comp = pane.getComponentAt(i);
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
System.out.println("Label text = " + label.getText());
switch (JOptionPane.showConfirmDialog(this, "Are you sure you want to close the \"" + pane.getTitleAt(i) + "\" tab?", "Close", JOptionPane.OK_CANCEL_OPTION)) {
case JOptionPane.OK_OPTION:
pane.remove(i);
break;
}
}
}
}
//we don't want to update UI for this button
public void updateUI() {
}
//paint the cross
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
//shift the image for pressed buttons
if (getModel().isPressed()) {
g2.translate(1, 1);
}
g2.setStroke(new BasicStroke(2));
g2.setColor(Color.BLACK);
if (getModel().isRollover()) {
g2.setColor(Color.MAGENTA);
}
int delta = 6;
g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
g2.dispose();
}
}
private final static MouseListener buttonMouseListener = new MouseAdapter() {
public void mouseEntered(MouseEvent e) {
Component component = e.getComponent();
if (component instanceof AbstractButton) {
AbstractButton button = (AbstractButton) component;
button.setBorderPainted(true);
}
}
public void mouseExited(MouseEvent e) {
Component component = e.getComponent();
if (component instanceof AbstractButton) {
AbstractButton button = (AbstractButton) component;
button.setBorderPainted(false);
}
}
};
}
}