CARDLAYOUT

Introduction

The class CardLayout arranges each component in the container as a card. Only one card is visible at a time, and the container acts as a stack of cards.

Class Declaration

Following is the declaration for java.awt.CardLayout class −

public class CardLayout
   extends Object
      implements LayoutManager2, Serializable

Class Constructors

Sr.No.	Constructor & Description
1	CardLayout() Creates a new card layout with the gaps of size zero.
2	CardLayout(int hgap, int vgap) Creates a new card layout with the specified horizontal and vertical gaps.

Class Methods

Sr.No.	Method & Description
1	void addLayoutComponent(Component comp, Object constraints) Adds the specified component to this card layout's internal table of names.
2	void addLayoutComponent(String name, Component comp) If the layout manager uses a per-component string, adds the component comp to the layout, associating it with the string specified by name.
3	void first(Container parent) Flips to the first card of the container.
4	int getHgap() Gets the horizontal gap between the components.
5	float getLayoutAlignmentX(Container parent) Returns the alignment along the x axis.
6	float getLayoutAlignmentY(Container parent) Returns the alignment along the y axis.
7	int getVgap() Gets the vertical gap between the components.
8	void invalidateLayout(Container target) Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
9	void last(Container parent) Flips to the last card of the container.
10	void layoutContainer(Container parent) Lays out the specified container using this card layout.
11	Dimension maximumLayoutSize(Container target) Returns the maximum dimensions for this layout given the components in the specified target container.
12	Dimension minimumLayoutSize(Container parent) Calculates the minimum size for the specified panel.
13	void next(Container parent) Flips to the next card of the specified container.
14	Dimension preferredLayoutSize(Container parent) Determines the preferred size of the container argument using this card layout.
15	void previous(Container parent) Flips to the previous card of the specified container.
16	void removeLayoutComponent(Component comp) Removes the specified component from the layout.
17	void setHgap(int hgap) Sets the horizontal gap between the components.
18	void setVgap(int vgap) Sets the vertical gap between the components.
19	void show(Container parent, String name) Flips to the component that was added to this layout with the specified name, using addLayoutComponent.
20	String toString() Returns a string representation of the state of this card layout.

Methods Inherited

This class inherits methods from the following class −

• java.lang.Object

CardLayout Example

Create the following Java program using any editor of your choice in say D:/ > SWING > com > sjavaspot > gui >

SwingLayoutDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingLayoutDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   private JLabel msglabel;

   public SwingLayoutDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingLayoutDemo swingLayoutDemo = new SwingLayoutDemo();  
      swingLayoutDemo.showCardLayoutDemo();       
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      
      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showCardLayoutDemo(){
      headerLabel.setText("Layout in action: CardLayout");      

      final JPanel panel = new JPanel();
      panel.setBackground(Color.CYAN);
      panel.setSize(300,300);

      CardLayout layout = new CardLayout();
      layout.setHgap(10);
      layout.setVgap(10);
      panel.setLayout(layout);        
      
      JPanel buttonPanel = new JPanel(new FlowLayout());
      buttonPanel.add(new JButton("OK"));
      buttonPanel.add(new JButton("Cancel"));    

      JPanel textBoxPanel = new JPanel(new FlowLayout());
      textBoxPanel.add(new JLabel("Name:"));
      textBoxPanel.add(new JTextField(20));

      panel.add("Button", buttonPanel);
      panel.add("Text", textBoxPanel);
      final DefaultComboBoxModel panelName = new DefaultComboBoxModel();

      panelName.addElement("Button");
      panelName.addElement("Text");
      final JComboBox listCombo = new JComboBox(panelName);    
      
      listCombo.setSelectedIndex(0);
      JScrollPane listComboScrollPane = new JScrollPane(listCombo);    
      JButton showButton = new JButton("Show");

      showButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) { 
            String data = "";
            if (listCombo.getSelectedIndex() != -1) {  
               CardLayout cardLayout = (CardLayout)(panel.getLayout());
               cardLayout.show(panel, 
                  (String)listCombo.getItemAt(listCombo.getSelectedIndex()));            
            }              
            statusLabel.setText(data);
         }
      }); 
      controlPanel.add(listComboScrollPane);
      controlPanel.add(showButton);
      controlPanel.add(panel);
      mainFrame.setVisible(true);  
   }
}

THE OUTPUT:

ANOTHER CODE ON CARDLAYOUT

import java.awt.*;  
import java.awt.event.*;  
  
import javax.swing.*;  
  
public class CardLayoutExample extends JFrame implements ActionListener{  
CardLayout card;  
JButton b1,b2,b3;  
Container c;  
    CardLayoutExample(){  
          
        c=getContentPane();  
        card=new CardLayout(40,30);  
//create CardLayout object with 40 hor space and 30 ver space  
        c.setLayout(card);  
          
        b1=new JButton("Apple");  
        b2=new JButton("Boy");  
        b3=new JButton("Cat");  
        b1.addActionListener(this);  
        b2.addActionListener(this);  
        b3.addActionListener(this);  
              
        c.add("a",b1);c.add("b",b2);c.add("c",b3);  
                          
    }  
    public void actionPerformed(ActionEvent e) {  
    card.next(c);  
    }  
  
    public static void main(String[] args) {  
        CardLayoutExample cl=new CardLayoutExample();  
        cl.setSize(400,400);  
        cl.setVisible(true);  
        cl.setDefaultCloseOperation(EXIT_ON_CLOSE);  
    }  
}  

THE OUTPUT:

ANOTHER CODE ON CARDLAYOUT

import java.awt.*;    
import java.awt.event.*;  
class CardLayoutExample extends Frame implements ActionListener 
{ 
     CardLayout card = new CardLayout(20,20); 
                        
     CardLayoutExample() 
     { 
        
      setLayout(card); 
         Button Btnfirst = new Button("first "); 
             
     Button BtnSecond = new Button ("Second"); 
         
      Button BtnThird = new Button("Third"); 
         
     add(Btnfirst,"Card1"); 
         
     add(BtnSecond,"Card2"); 
         
     add(BtnThird,"Card3"); 
         
     Btnfirst.addActionListener(this); 
         
     BtnSecond.addActionListener (this); 
             
     BtnThird.addActionListener(this); 
     
} 
     
   public void actionPerformed(ActionEvent e) 
     { 
       
        card.next(this); 
     
   }  
} 
   
class CardLayoutJavaExample 
   { 
        
     public static void main(String args[]) 
       {  
            CardLayoutExample frame = new CardLayoutExample();  
            frame.setTitle("CardLayout in Java Example");  
            frame.setSize(220,150);
 
            frame.setResizable(false); 
            
frame.setVisible(true);
 
       } 
  
 } 

THE OUTPUT