如何通过外部 ActionListeners 在 CardLayout 中的面板之间切换 类
How to Switch between Panels in CardLayout from ActionListeners in external classes
我在主 class 中有一个 cardLayout,通过面板将 Gui classes 添加到布局中,当按下 Room1Button 时,它如何将主方法中的卡片切换到Gui2 卡片
这是解决此问题的最佳方法吗?我们会提供任何帮助
主要方法
import javax.swing.*;
import java.awt.*;
class Main
{
CardLayout cl=new CardLayout();
GridBagConstraints gb=new GridBagConstraints();
JFrame frame=new JFrame("Frame");
JPanel panel =new JPanel();
Gui1 g1= Gui1();
Gui2 g2= Gui2();
public Main()
{
panel.setLayout(cl);
panel.add(g1, "1");
panel.add(g2, "2");
frame.add(panel);
frame.pack();
frame.setVisible(true);
cl.show(panel,"1");
//how would the actionlistner in the Gui1 class switch the layout to "2"
cl.show(panel, "2");
}
public static void main(String[]param)
{
new Main();
}
}
gui1class
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;
public class Gui1 extends JPanel implements ActionListener{
private JButton room1Button;
JPanel panel=new JPanel();
{
setSize(1000,1000);
panel.setVisible(true);
room1Button=new JButton("Go the next Panel");
this.setVisible(true);
room1Button.addActionListener(this);
add(room1Button);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==room1Button){
Window w = SwingUtilities.getWindowAncestor(R0.this);
w.setVisible(false);
}
}
}
Gui2class
public class Gui2 extends JPanel implements Actionlistener
{
// some code
}
希望对您有所帮助。
package cardlayoutsample;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class CardLayoutSample {
JFrame frame = new JFrame("CardLayout Demo");
JPanel panelCont = new JPanel();
JPanel panelFirst = new JPanel();
JPanel panelSecond = new JPanel();
JButton btnOne = new JButton("Switch");
JButton btnTwo = new JButton("Back");
CardLayout cl = new CardLayout();
public CardLayoutSample(){
panelCont.setLayout(cl);
panelFirst.add(btnOne);
panelSecond.add(btnTwo);
panelFirst.setBackground(Color.red);
panelSecond.setBackground(Color.blue);
panelCont.add(panelFirst,"1");
panelCont.add(panelSecond,"2");
cl.show(panelCont, "1");
btnOne.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0){
cl.show(panelCont, "2");
}
});
btnTwo.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0){
cl.show(panelCont, "1");
}
});
frame.add(panelCont);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
public static void main(String[] args) {
CardLayoutSample a = new CardLayoutSample();
}
}
尝试播放这个按钮你可以看到当你点击按钮时它正在切换面板。
ActionListener 的语法
Component.addActionListener(new ActionListener (){
@Override
public void actionPerformed(ActionEvent e){
//do this
}
});
示例
LogoutButton.addActionListener(new ActionListener (){
@Override
public void actionPerformed(ActionEvent e){
System.exit(0);
}
});
ActionEvent 将包含生成事件的源对象。在本例中是 JButton。因此,您的 GUI1 class 中 ActionListener 的通用代码类似于:
JButton button = (JButton)e.getSource();
JPanel buttonPanel = (JPanel)button.getParent();
JPanel cardLayoutPanel = (JPanel)buttonPanel.getParent();
CardLayout layout = (CardLayout)cardLayoutPanel.getLayout();
layout.show(cardLayoutPanel, "2");
我在主 class 中有一个 cardLayout,通过面板将 Gui classes 添加到布局中,当按下 Room1Button 时,它如何将主方法中的卡片切换到Gui2 卡片
这是解决此问题的最佳方法吗?我们会提供任何帮助
主要方法
import javax.swing.*;
import java.awt.*;
class Main
{
CardLayout cl=new CardLayout();
GridBagConstraints gb=new GridBagConstraints();
JFrame frame=new JFrame("Frame");
JPanel panel =new JPanel();
Gui1 g1= Gui1();
Gui2 g2= Gui2();
public Main()
{
panel.setLayout(cl);
panel.add(g1, "1");
panel.add(g2, "2");
frame.add(panel);
frame.pack();
frame.setVisible(true);
cl.show(panel,"1");
//how would the actionlistner in the Gui1 class switch the layout to "2"
cl.show(panel, "2");
}
public static void main(String[]param)
{
new Main();
}
}
gui1class
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;
public class Gui1 extends JPanel implements ActionListener{
private JButton room1Button;
JPanel panel=new JPanel();
{
setSize(1000,1000);
panel.setVisible(true);
room1Button=new JButton("Go the next Panel");
this.setVisible(true);
room1Button.addActionListener(this);
add(room1Button);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==room1Button){
Window w = SwingUtilities.getWindowAncestor(R0.this);
w.setVisible(false);
}
}
}
Gui2class
public class Gui2 extends JPanel implements Actionlistener
{
// some code
}
希望对您有所帮助。
package cardlayoutsample;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class CardLayoutSample {
JFrame frame = new JFrame("CardLayout Demo");
JPanel panelCont = new JPanel();
JPanel panelFirst = new JPanel();
JPanel panelSecond = new JPanel();
JButton btnOne = new JButton("Switch");
JButton btnTwo = new JButton("Back");
CardLayout cl = new CardLayout();
public CardLayoutSample(){
panelCont.setLayout(cl);
panelFirst.add(btnOne);
panelSecond.add(btnTwo);
panelFirst.setBackground(Color.red);
panelSecond.setBackground(Color.blue);
panelCont.add(panelFirst,"1");
panelCont.add(panelSecond,"2");
cl.show(panelCont, "1");
btnOne.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0){
cl.show(panelCont, "2");
}
});
btnTwo.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0){
cl.show(panelCont, "1");
}
});
frame.add(panelCont);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
public static void main(String[] args) {
CardLayoutSample a = new CardLayoutSample();
}
}
尝试播放这个按钮你可以看到当你点击按钮时它正在切换面板。
ActionListener 的语法
Component.addActionListener(new ActionListener (){
@Override
public void actionPerformed(ActionEvent e){
//do this
}
});
示例
LogoutButton.addActionListener(new ActionListener (){
@Override
public void actionPerformed(ActionEvent e){
System.exit(0);
}
});
ActionEvent 将包含生成事件的源对象。在本例中是 JButton。因此,您的 GUI1 class 中 ActionListener 的通用代码类似于:
JButton button = (JButton)e.getSource();
JPanel buttonPanel = (JPanel)button.getParent();
JPanel cardLayoutPanel = (JPanel)buttonPanel.getParent();
CardLayout layout = (CardLayout)cardLayoutPanel.getLayout();
layout.show(cardLayoutPanel, "2");