Following is the declaration for java.awt.GridBagLayout class −
public class GridBagLayout
extends Object
implements LayoutManager2, Serializable
# Field
Following are the fields for java.awt.GridBagLayout class −
static int DEFAULT_SIZE− Indicates the size from the component or the gap should be used for a particular range value.static int PREFERRED_SIZE− Indicates the preferred size from the component or the gap should be used for a particular range value.
# Constructors
GridBagLayout() | Creates a grid bag layout manager. |
Class Methods
void addLayoutComponent(Component comp, Object constraints) | Adds the specified component to the layout, using the specified constraints object. |
void addLayoutComponent(String name, Component comp) | Adds the specified component with the specified name to the layout. |
protected void adjustForGravity(GridBagConstraints constraints, Rectangle r) | Adjusts the x, y width and height fields to the correct values depending on the constraint geometry and pads. |
protected void AdjustForGravity(GridBagConstraints constraints, Rectangle r) | This method is obsolete and supplied for backward compatibility only; new code should call adjustForGravity instead. |
protected void arrangeGrid(Container parent) | Lays out the grid. |
protected void ArrangeGrid(Container parent) | This method is obsolete and supplied for backward compatibility only; new code should call arrangeGrid instead. |
GridBagConstraints getConstraints(Component comp) | Gets the constraints for the specified component. |
float getLayoutAlignmentX(Container parent) | Returns the alignment along the x-axis. |
float getLayoutAlignmentY(Container parent) | Returns the alignment along the y-axis. |
int[][] getLayoutDimensions() | Determines column widths and row heights for the layout grid. |
protected java.awt.GridBagLayoutInfo getLayoutInfo(Container parent, int sizeflag) | Fills in an instance of GridBagLayoutInfo for the current set of managed children. |
protected java.awt.GridBagLayoutInfo GetLayoutInfo(Container parent, int sizeflag) | This method is obsolete and supplied for backward compatibility only; new code should call getLayoutInfo instead. |
Point getLayoutOrigin() | Determines the origin of the layout area, in the graphics coordinate space of the target container. |
double[][] getLayoutWeights() | Determines the weights of the layout grid’s columns and rows. |
protected Dimension getMinSize(Container parent, java.awt.GridBagLayoutInfo info) | Figures out the minimum size of the master based on the information from getLayoutInfo(). |
protected Dimension GetMinSize(Container parent, java.awt.GridBagLayoutInfo info) | This method is obsolete and supplied for backward compatibility only; new code should call getMinSize instead. |
void invalidateLayout(Container target) | Invalidates the layout, indicating that if the layout manager has cached information it should be discarded. |
void layoutContainer(Container parent) | Lays out the specified container using this grid bag layout. |
Point location(int x, int y) | Determines which cell in the layout grid contains the point specified by (x, y). |
protected GridBagConstraints lookupConstraints(Component comp) | Retrieves the constraints for the specified component. |
Dimension maximumLayoutSize(Container target) | Returns the maximum dimensions for this layout given the components in the specified target container. |
Dimension minimumLayoutSize(Container parent) | Determines the minimum size of the parent container using this grid bag layout. |
Dimension preferredLayoutSize(Container parent) | Determines the preferred size of the parent container using this grid bag layout. |
void removeLayoutComponent(Component comp) | Removes the specified component from this layout. |
void setConstraints(Component comp, GridBagConstraints constraints) | Sets the constraints for the specified component in this layout. |
String toString() | Returns a string representation of this grid bag layout’s values. |
# Methods Inherited
- java.lang.Object
# GridBagLayout Example
SwingLayoutDemo.java
package com.simplecheatsheet.gui;
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.showGridBagLayoutDemo();
}
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 showGridBagLayoutDemo(){
headerLabel.setText("Layout in action: GridBagLayout");
JPanel panel = new JPanel();
panel.setBackground(Color.darkGray);
panel.setSize(300,300);
GridBagLayout layout = new GridBagLayout();
panel.setLayout(layout);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 0;
gbc.gridy = 0;
panel.add(new JButton("Button 1"),gbc);
gbc.gridx = 1;
gbc.gridy = 0;
panel.add(new JButton("Button 2"),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.ipady = 20;
gbc.gridx = 0;
gbc.gridy = 1;
panel.add(new JButton("Button 3"),gbc);
gbc.gridx = 1;
gbc.gridy = 1;
panel.add(new JButton("Button 4"),gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = 2;
panel.add(new JButton("Button 5"),gbc);
controlPanel.add(panel);
mainFrame.setVisible(true);
}
}