Resetting the Viewport Position: move JScrollPane to the top : JScrollPane « Swing « Java Tutorial

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Java Tutorial » Swing » JScrollPane 
14. 46. 9. Resetting the Viewport Position: move JScrollPane to the top
Resetting the Viewport Position: move JScrollPane to the top
import java.awt.event.*;
import javax.swing.*;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;

class JScrollPaneToTopAction implements ActionListener {
  JScrollPane scrollPane;
  public JScrollPaneToTopAction(JScrollPane scrollPane) {
    if (scrollPane == null) {
      throw new IllegalArgumentException(
        "JScrollPaneToTopAction: null JScrollPane");
    }
    this.scrollPane = scrollPane;
  }
  public void actionPerformed(ActionEvent actionEvent) {
    JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar();
    JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar();
    verticalScrollBar.setValue(verticalScrollBar.getMinimum());
    horizontalScrollBar.setValue(horizontalScrollBar.getMinimum());
  }
}


public class JScrollPaneToTopActionDemo {

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

    JLabel label = new JLabel("Label");
    label.setPreferredSize(new Dimension(10001000));
    JScrollPane jScrollPane = new JScrollPane(label);

    JButton bn = new JButton("Move");
    
    bn.addActionListener(new JScrollPaneToTopAction(jScrollPane));
    
    frame.add(bn, BorderLayout.SOUTH);
    frame.add(jScrollPane, BorderLayout.CENTER);
    frame.setSize(400150);
    frame.setVisible(true);
  }
}
14. 46. JScrollPane
14. 46. 1. Working with JScrollPane Headers and Corners
14. 46. 2. Add component to JScrollPaneAdd component to JScrollPane
14. 46. 3. Create a scrollable list
14. 46. 4. A corner component is displayed only if the two components at a right angle from the corner are currently shown.A corner component is displayed only if the two components at a right angle from the corner are currently shown.
14. 46. 5. Set Row Header ViewSet Row Header View
14. 46. 6. Adding component to JScrollPane using its constructorAdding component to JScrollPane using its constructor
14. 46. 7. JScrollPane: display a large component within a smaller display areaJScrollPane: display a large component within a smaller display area
14. 46. 8. Set Continuous Layout
14. 46. 9. Resetting the Viewport Position: move JScrollPane to the topResetting the Viewport Position: move JScrollPane to the top
14. 46. 10. Customizing a JScrollPane Look and Feel
14. 46. 11. Get the default scrollbar policy
14. 46. 12. Listening for Scrollbar Value Changes in a JScrollPane Container
14. 46. 13. Make the scrollbars always appear
14. 46. 14. Make the scrollbars never appear
14. 46. 15. JScrollPane Scrollbar Policies
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