ButtonCornerSample.java Source code

Introduction

Here is the source code for ButtonCornerSample.java

Source

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 ButtonCornerSample {
    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.getContentPane().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());
    }
}