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
S.N. | Constructor & Description |
---|---|
1 | CardLayout()Creates a new card layout with gaps of size zero. |
2 | CardLayout(int hgap, int vgap)Creates a new card layout with the specified horizontal and vertical gaps. |
Class methods
S.N. | 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 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 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 components. |
18 | void setVgap(int vgap)Sets the vertical gap between 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 classes:
- java.lang.Object
CardLayout Example
Create the following java program using any editor of your choice in say D:/ > AWT > com > adglob > gui >AwtLayoutDemo.java
package com.adglob.gui; import java.awt.*; import java.awt.event.*; public class AwtLayoutDemo { private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; private Label msglabel; public AwtLayoutDemo(){ prepareGUI(); } public static void main(String[] args){ AwtLayoutDemo awtLayoutDemo = new AwtLayoutDemo(); awtLayoutDemo.showCardLayoutDemo(); } private void prepareGUI(){ mainFrame = new Frame("Java AWT Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); headerLabel = new Label(); headerLabel.setAlignment(Label.CENTER); statusLabel = new Label(); statusLabel.setAlignment(Label.CENTER); statusLabel.setSize(350,100); msglabel = new Label(); msglabel.setAlignment(Label.CENTER); msglabel.setText("Welcome to Adglob AWT Tutorial."); controlPanel = new Panel(); 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 Panel panel = new Panel(); panel.setBackground(Color.CYAN); panel.setSize(300,300); CardLayout layout = new CardLayout(); layout.setHgap(10); layout.setVgap(10); panel.setLayout(layout); Panel buttonPanel = new Panel(new FlowLayout()); buttonPanel.add(new Button("OK")); buttonPanel.add(new Button("Cancel")); Panel textBoxPanel = new Panel(new FlowLayout()); textBoxPanel.add(new Label("Name:")); textBoxPanel.add(new TextField(20)); panel.add("Button", buttonPanel); panel.add("Text", textBoxPanel); Choice choice = new Choice(); choice.add("Button"); choice.add("Text"); choice.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { CardLayout cardLayout = (CardLayout)(panel.getLayout()); cardLayout.show(panel, (String)e.getItem()); } }); controlPanel.add(choice); controlPanel.add(panel); mainFrame.setVisible(true); } }
Compile the program using command prompt. Go to D:/ > AWT and type the following command.
D:\AWT>javac com\adglob\gui\AwtlayoutDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\AWT>java com.adglob.gui.AwtlayoutDemo
Verify the following output
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