Java 单击按钮时如何在jframe上用另一个jpanel替换jpanel
我希望在按下帧左侧JPanel中的相应按钮时,替换帧中心的JPanel。 我正在使用cardlayout替换中心的面板。 下面是我用来在单击按钮时更改面板的示例代码,但它不起作用。谁能告诉我密码有什么问题吗 库扩展了JFrameJava 单击按钮时如何在jframe上用另一个jpanel替换jpanel,java,swing,actionlistener,cardlayout,Java,Swing,Actionlistener,Cardlayout,我希望在按下帧左侧JPanel中的相应按钮时,替换帧中心的JPanel。 我正在使用cardlayout替换中心的面板。 下面是我用来在单击按钮时更改面板的示例代码,但它不起作用。谁能告诉我密码有什么问题吗 库扩展了JFrame Public Library(){ Container container = getContentPane(); container.setLayout( new BorderLayout() ); setExtended
Public Library(){
Container container = getContentPane();
container.setLayout( new BorderLayout() );
setExtendedState(JFrame.MAXIMIZED_BOTH);
banner = new BannerPanel();
container.add(banner,BorderLayout.NORTH);
MenuButtons = new MenuButtonPanel();
container.add(MenuButtons,BorderLayout.WEST);
SelectedButtonPanel = new SelectedPanel(container);
setLocationRelativeTo(null);
setVisible( true );
init();
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
MenuButtonPanel扩展了JPanel,其中包含多个按钮。it ButtonHandler的内部类实现了按钮的actionListner
//inner class
class ButtonEventHandler implements ActionListener {
public void actionPerformed( ActionEvent event ){
SelectedPanel selectObj = new SelectedPanel();
if("about".equals(event.getActionCommand()))
{
selectObj.showReplacePanel("about");
}
else if("checkout".equals(event.getActionCommand()))
{
selectObj.showReplacePanel("checkout");
}
else if("search".equals(event.getActionCommand()))
{
selectObj.showReplacePanel("search");
}
所选面板应在框架中心显示替换的Jpanel
public SelectedPanel() {}
public SelectedPanel(Container framePane)
{
addSelectedPanel(framePane);
}
public void addSelectedPanel(Container framePane)
{
cardPanel = new JPanel();
//set layout of panel
cardPanel.setLayout(new CardLayout());
cardPanel.setBorder(null);
cardPanel.setForeground(new Color(0, 0, 0));
//this.selObj = selObj;
aboutPanel = new About();
checkoutPanel = new Checkout();
searchPanel = new Search();
cardPanel.add(aboutPanel,ABOUTBUTTON);
cardPanel.add(checkoutPanel,CHECKOUTBUTTON);
cardPanel.add(searchPanel, SEARCHBUTTON);
framePane.add(cardPanel, BorderLayout.CENTER); }
selectedPanel类还有showReplacePanel()方法,该方法在buttonClick的actionPerformed中调用
public void showReplacePanel(String selObj)
{
System.out.println("cardlayout entered");
CardLayout cl = (CardLayout)(cardPanel.getLayout());
System.out.println("cardlayout entered");
switch(selObj){
case "about":
cl.show(cardPanel,ABOUTBUTTON);
break;
case "search":
//this.repPanel = searchPanel;
cl.show(cardPanel,SEARCHBUTTON);
break;
case "checkout":
cl.show(cardPanel,CHECKOUTBUTTON);
//this.repPanel = checkoutPanel;
break;
我为您创建了一个示例,看看
actionPerformed(ActionEvent e)
方法
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PanelSwap extends JPanel implements ActionListener {
JPanel firstPanel = new JPanel();
JPanel secondPanel = new JPanel();
public PanelSwap() {
super(new BorderLayout());
firstPanel.setBackground(Color.RED);
secondPanel.setBackground(Color.YELLOW);
JButton swap1 = new JButton("SwapToYellow");
swap1.addActionListener(this);
JButton swap2 = new JButton("SwapToRed");
swap2.addActionListener(this);
firstPanel.add(swap1);
secondPanel.add(swap2);
add(firstPanel);
}
/** Listens to the buttons and perfomr the swap. */
public void actionPerformed(ActionEvent e) {
for (Component component : getComponents())
if (firstPanel == component) {
remove(firstPanel);
add(secondPanel);
} else {
remove(secondPanel);
add(firstPanel);
}
repaint();
revalidate();
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("PanelSwap");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
JComponent newContentPane = new PanelSwap();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
您是否将操作侦听器添加到某个内容中?请提供一个简单、简短、可编译且完整的示例a,以获得更好的帮助。:-)一个相关的,同时需要一些帮助:-)对于一个空间中的许多组件,请使用如图所示的。我忘了将cardPanel和ShowRepalCheckPanel设置为静态。一旦我宣布,它现在就可以工作了,尽管您给出的示例在这方面是好的+1:-),但当
Swing
已经有一个Layout Manager
可以处理这种情况并取消revalidate()/repaint()
-1时,它被认为不是一个好的实践,因为这个原因:(.此外,OP使用的是CardLayout
,它不是像revalidate()/repaint()
:-)这样的调用的从属)谢谢你的回复。但是有8个按钮,每次点击按钮我都需要更改面板。我在网上看到的所有示例都是用于在2个面板之间切换的。因此我实现了cardlayout。我解决了代码中的问题。我无法声明showReplacePanel()方法和cardPanel为静态。将htem声明为静态后,将替换面板。