What is the use of JScrollPane class?

[Khan Baba]

Hi friends,

I need your help to get solution over my query related to the java concept. I am quit confused about the 'JScrollPane class'' of java programming. I don't have any idea about the use of 'JScrollPane class'. I have searched lots of websites to get details over this, but didn't get enough details. If you have knowledge about 'JScrollPane class', then please let me know that. Your help would be greatly appreciated.

[Katty]

A JScrollPane class provides a scrollable view of a lightweight component. A JScrollPane manages a viewport, optional vertical and horizontal scroll bars, and optional row and column heading viewports. Note that JScrollPane does not support heavyweight components. The JViewport provides a window, or "viewport" onto a data source - for example, a text file. That data source is the "scrollable client" (aka data model) displayed by the JViewport view.

[kelfro]

Hi friend,
If you want to know about the use of JScrollPane class of java, then please refer following example:

import javax.swing.JScrollPane;
import javax.swing.border.LineBorder;

public class AddingToJScrollPaneDM {

  public static void main(String args[]) {
    JFrame frameK = new JFrame("Tabbed Pane Sample");
    frameK.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JLabel label2 = new JLabel("Label");
    label2.setPreferredSize(new Dimension(1200, 1000));
    JScrollPane jScrollPane2 = new JScrollPane(label2);

    JButton jButton1 = new JButton();

    jScrollPane2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    jScrollPane2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    jScrollPane2.setViewportBorder(new LineBorder(Color.RED));
    jScrollPane2.getViewport().add(jButton1, null);

    frameK.add(jScrollPane, BorderLayout.CENTER);
    frameK.setSize(400, 150);
    frameK.setVisible(true);
  }
}

[Zecho]

Following are some oftenly used methods of JScrollPane class, which are very useful while accessing the properties of JScrollPane class:

• setWheelScrollingEnabled(boolean handleWheelVal)
• setViewportView(Component vw)
• setViewportBorder(Border vwportBorder)
• setViewport(JViewport vwport)
• setVerticalScrollBar(JScrollBar verticalScrlBar)
• setRowHeader(JViewport rwHeader)

[Reegan]

If you want to add component to the JScrollPane by using constructors of JScrollPane class, then please use following java code:

import javax.swing.JScrollPane;
import javax.swing.JLabel;

public class AddingToJScrollPN {

  public static void main(String argsm[]) {
    JFrame KX = new JFrame("Tabbed Pane Sample");
    KX.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JLabel label = new JLabel("Label");
    label.setPreferredSize(new Dimension(1000, 1000));
    JScrollPane jScrollPane = new JScrollPane(label);

    KX.add(jScrollPane, BorderLayout.CENTER);
    KX.setSize(300, 150);
    KX.setVisible(true);
  }
}

[opaper]

Hi,

Below are four constructors of the JScrollPane class, which comprises same nae but with different parameter list to preserve uniqueness.

1. JScrollPane(int vsbPlc, int hsbPlc)
2. JScrollPane(Component vw, int vsbPlc, int hsbPlc)
3. JScrollPane(Component vw)
4. JScrollPane()