ScrollPaneLayout

The layout manager is used by JScrollPane. JScrollPaneLayout is responsible for nine components: a viewport, two scrollbars, a row header, a column header, and four "corner" components.

Constructor

ScrollPaneLayout(): The parameterless constructor is used to create a new ScrollPanelLayout.

Nested Class

Modifier and Type	Class	Description
static class	ScrollPaneLayout.UIResource	It is UI resource version of ScrollPaneLayout.

FieldScrollPanelLayout Field

Modifier and Type	Field	Description
protected JViewport	colHead	It is column header child.
protected JScrollBar	hsb	It is scrollpane's horizontal scrollbar child.
protected int	hsbPolicy	It displays policy for the horizontal scrollbar.
protected Component	lowerLeft	This displays the lower left corner.
protected Component	lowerRight	This displays in the lower right corner.
protected JViewport	rowHead	It is row header child.
protected Component	upperLeft	This component displays in the upper left corner.
protected Component	upperRight	This component displays in the upper right corner.
protected JViewport	viewport	It is scrollpane's viewport child.
protected JScrollBar	vsb	It is scrollpane's vertical scrollbar child.
protected int	vsbPolicy	It is the display policy for the vertical scrollbar.

ScrollPanelLayout Methods

Modifier and Type	Method	Description
void	addLayoutComponent(String s, Component c)	It adds the specified component to the layout.
protected Component	addSingletonComponent(Component oldC, Component newC)	It removes an existing component.
JViewport	getColumnHeader()	It returns the JViewport object that is the column header.
Component	getCorner(String key)	It returns the Component at the specified corner.
JScrollBar	getHorizontalScrollBar()	It returns the JScrollBar object that handles horizontal scrolling.
int	getHorizontalScrollBarPolicy()	It returns the horizontal scrollbar-display policy.
JViewport	getRowHeader()	It returns the JViewport object that is the row header.
JScrollBar	getVerticalScrollBar()	It returns the JScrollBar object that handles vertical scrolling.
int	getVerticalScrollBarPolicy()	It returns the vertical scrollbar-display policy.
JViewport	getViewport()	It returns the JViewport object that displays the scrollable contents.

Example: 1

FileName: ScrollPaneDemo.java

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
public class ScrollPaneDemo extends JFrame
{
public ScrollPaneDemo() {
super("ScrollPane Demo");
ImageIcon img = new ImageIcon("child.png");

JScrollPane png = new JScrollPane(new JLabel(img));

getContentPane().add(png);
setSize(300,250);
setVisible(true);
}

public static void main(String[] args) {
new ScrollPaneDemo();
}
}

Output:

Example: 2

The below Java program shows the usage of the ScrollPaneLayout by arranging the several components of JLabel in a JFrame,

whose instance class is named as "ScrollPaneDemo1". We create one JScrollPane component named "scrlpane".

Also, the JRadioButton and ButtonGroup are made. We set the visibility and size of the frame by using the setVisible() and setSize() methods, respectively.

The layout is being set by using the setLayout() method.

FileName: ScrollPaneDemo1.java

// important import statements
import java.awt.BorderLayout;
import javax.swing.ButtonGroup;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JRadioButton;


// creating a class ScrollPaneDemo1
// for extending the JFrame
public class ScrollPaneDemo1 extends JFrame 
{

// Declaring the objects of
// the JScrollPane class
JScrollPane scrlpane;

// Constructor of the ScrollPaneDemo1 class
public ScrollPaneDemo1()
{

// using to invoke the super class
// methods and variables
super("JScrollPane Rating Display");

// Method to determine the size of the JFrame.
setSize(310, 210);

// Method to set the Default
// tereminating operation of the JFrame.
setDefaultCloseOperation(EXIT_ON_CLOSE);


inner(); // invoking the method inner

// Method for setting the 
// visibility of the JFrame.
setVisible(true);
}

// method inner
public void inner()
{

// Declaring the objects
// of the JRadioButton class.
JRadioButton f[][] = new JRadioButton[12][5];

// to stores the ratings (1 stat, 2 star, etc)
String cnts[] = {"RATING ", "  *", " * * ",
"* * * ", " * * * * ", " * * * * * "};

// to storing the string values
String ctg[] = {"CCNA", "Design Patterns", "Java",
	 "Python", "Algorithms",
	"JAVASCRIPT", "Operating System", "CS Subject", 
	"Data Structure", "PHP language", "Concurrency",
	"C #" };

// Declaration of objects
// of the JPanel class.
JPanel panel = new JPanel();

// method to determine the size of the JFrame.
panel.setSize(610, 410);

// method to set the Layout of the JFrame.
panel.setLayout(new GridLayout(13, 6, 10, 0));

// for loop
for (int r = 0; r < 13; r++) {

// Declaring the objects
// of the ButtonGroup class
ButtonGroup btngrp = new ButtonGroup();

for (int c = 0; c < 6; c++)
{

// for the 0th row
if (r == 0) 
{

// adding a new Jlabel
panel.add(new JLabel(cnts[c]));
}
else {
// for the 0th col
if (c == 0)
{

// adding the new Jlabel
panel.add(new JLabel(ctg[r - 1]));
}

else
{
f[r - 1][c - 1] = new JRadioButton();

// adding the form in the ButtonGroup
btngrp.add(f[r - 1][c - 1]);

// adding the form in the JFrame
panel.add(f[r - 1][c - 1]);
}
}
}
}

// Declaring the objects
// of the scrollpane class.
scrlpane = new JScrollPane(panel);

// for getting the content pane
getContentPane().add(scrlpane, BorderLayout.CENTER);
}

// main method
public static void main(String argvs[])
{
new ScrollPaneDemo1();
}
}

Output: