JScrollBar scroll-Verhalten auf 2 JButtons umleiten?

[java.jago]

Hi,

Ich habe eine JScollPane. Ich will die JScollBars nicht anzeigen sondern deren Funktionalität auf zwei JButtons (mit Pfeil-Images die nach links und rechts zeigen) umleiten.

Wie kann ich das am einfachsten machen?


Danke,
jago

 

[André Uhres]

Du könntest deine Komponente mit JViewport#setView in einen JViewport tun
und dann mit JViewport#setViewPosition scrollen:

package scroll;

/*
 * ScrollTest.java
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.Timer;
import javax.swing.event.*;

public class ScrollTest extends JPanel implements MouseListener, ActionListener {

    private JViewport viewport;
    private JComponent scrollable;
    private JButton bt1;
    private JButton bt2;
    private Timer timer1;
    private Timer timer2;
    private int scrollDelay = 50;
    private int scrollSchritt = 10;
    private Point viewPosition = new Point(0, 0);

    public ScrollTest() {
        setBackground(Color.YELLOW);
        scrollable = getScrollable();
        viewport = new JViewport();
        viewport.setView(scrollable);
        viewport.setPreferredSize(new Dimension(201, 81));
        viewport.setViewPosition(viewPosition);
        bt1 = new JButton("<");
        bt2 = new JButton(">");
        add(bt1);
        add(bt2);
        bt1.addMouseListener(this);
        bt2.addMouseListener(this);
        add(viewport);
        timer1 = new Timer(scrollDelay, this);
        timer2 = new Timer(scrollDelay, this);
    }

    @Override
    public void mouseClicked(MouseEvent e) {
    }

    @Override
    public void mousePressed(MouseEvent e) {
        Object source = e.getSource();
        if (source == bt1) {
            timer1.start();
        }
        if (source == bt2) {
            timer2.start();
        }
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        Object source = e.getSource();
        if (source == bt1) {
            timer1.stop();
        }
        if (source == bt2) {
            timer2.stop();
        }
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();
        if (source == timer1) {
            viewPosition.x -= scrollSchritt;
            if (viewPosition.x < 0) {
                viewPosition.x = 0;
            }

            viewport.setViewPosition(viewPosition);
//            scrollable.revalidate();
        }
        if (source == timer2) {
            viewPosition.x += scrollSchritt;
            if (viewPosition.x > scrollable.getWidth() - viewport.getWidth()) {
                viewPosition.x -= scrollSchritt;
            }
            viewport.setViewPosition(viewPosition);
//            scrollable.revalidate();
        }
    }

    private JComponent getScrollable() {
        JComponent result = null;

        JLabel label = new JLabel("Diesen Text kannst du mit den beiden Buttons nach links oder rechts scrollen.");
        result = label;

//        JTable table = new JTable(4, 6);
//        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//        JPanel borderPanel = new JPanel(new BorderLayout());
//        borderPanel.setBorder(BorderFactory.createLineBorder(table.getGridColor()));
//        JPanel panel = new JPanel(new BorderLayout());
//        panel.add(table.getTableHeader(), BorderLayout.NORTH);
//        panel.add(table);
//        borderPanel.add(panel);
//        result = borderPanel;

        return result;
    }

    public static void main(final String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame frame = new JFrame("");
                frame.setSize(300, 200);
                frame.setResizable(false);
                frame.setLocationRelativeTo(null);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setContentPane(new ScrollTest());
                frame.setVisible(true);
            }
        });
    }
}

 

[Guest]

Cool Danke!

Du kennst dich wirklich sehr gut mit Swing aus - Respekt!