JScrollPane: setCorner(String key, Component corner) : JScrollPane « javax.swing « Java by API

1. Java by API
2. javax.swing
3. JScrollPane

JScrollPane: setCorner(String key, Component corner)

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

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

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

    Icon acrossLogo = new ImageIcon("logo-across.jpg");
    Icon downLogo = new ImageIcon("logo-down.jpg");
    Icon bookCover = new ImageIcon("puzzlebook.jpg");
    JLabel columnLabel = new JLabel(acrossLogo);
    JLabel rowLabel = new JLabel(downLogo);
    JLabel coverLabel = new JLabel(bookCover);
    JButton button = new JButton("+");
    button.setFont(new Font("Monospaced", Font.PLAIN, 8));
    JScrollPane scrollPane = new JScrollPane(coverLabel);
    scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, button);
    scrollPane.setColumnHeaderView(columnLabel);
    scrollPane.setRowHeaderView(rowLabel);

    ActionListener actionListener = new JScrollPaneToTopAction(scrollPane);
    button.addActionListener(actionListener);

    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

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());
  }
}

   
    
  

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