鼠标滚轮听者的JScrollBar不工作(mouse wheel listener not work

我正在开发的NetBeans平台（NetBeans模块）的桌面应用程序中，我有一个desktoppane和JScrollBar中。我已经实现的MouseWheelListener并添加

scrollBar.addMouseWheelListener(this);

在类的构造函数。现在，当我滚动鼠标滚轮，虽然我在获取值它不滚动滚动条

 private void scrollBarMouseWheelMoved(java.awt.event.MouseWheelEvent evt) { 


 System.out.println("mouse value is------------ " + evt.paramString());
}

上述SOUT的输出中是

mouse value is------------ MOUSE_WHEEL,(8,49),absolute(0,0),button=0,clickCount=0,scrollType=WHEEL_UNIT_SCROLL,scrollAmount=3,wheelRotation=1

我现在应该怎么做，以使有关的JScrollBar mosue轮事件？

我已经搜查，但我发现滚动面板的事件，但我明确地寻找滚动条..

我已删除了额外的代码，并显示什么，我在下面的示例代码寻找

    public final class ScrollableWindow1TopComponent extends TopComponent implements ComponentListener, MouseWheelListener {

    private javax.swing.JScrollBar scrollBar;
    private javax.swing.JDesktopPane scrollableGraphnewContainer;

    public ScrollableWindow1TopComponent() {
      this.addComponentListener(this);
      scrollBar.addMouseWheelListener(this);

    }
     private void scrollBarMouseWheelMoved(java.awt.event.MouseWheelEvent evt) {                                          
       System.out.println("mouse value is------------ " + evt.paramString());
    }
     private void scrollBarAdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) { 
      //code that works fine 
    }
  }

Answer 1:

我认为你已经看的AdjustmentListener而非MouseXxxListener ，

final JScrollBar scrollBar = myScrollpane.getVerticalScrollBar();
scrollBar.addAdjustmentListener(new AdjustmentListener() {

    @Override
    public void adjustmentValueChanged(AdjustmentEvent e) {
        System.out.println("JScrollBar's current value = " + scrollBar.getValue());
    }
});

。

编辑

:-)没有，没有在我身边的任何问题:-)

import java.awt.*;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import javax.swing.*;

public class ListPanel extends JFrame {

    private static final long serialVersionUID = 1L;

    public ListPanel() {
        setLayout(new GridLayout(0, 2, 10, 10));
        DefaultListModel model = new DefaultListModel();
        model.addElement(createButtons("one"));
        model.addElement(createButtons("two"));
        model.addElement(createButtons("three"));
        model.addElement(createButtons("four"));
        model.addElement(createButtons("five"));
        model.addElement(createButtons("six"));
        model.addElement(createButtons("seven"));
        model.addElement(createButtons("eight"));
        model.addElement(createButtons("nine"));
        model.addElement(createButtons("ten"));
        model.addElement(createButtons("eleven"));
        model.addElement(createButtons("twelwe"));
        JList list = new JList(model);
        list.setCellRenderer(new PanelRenderer());
        JScrollPane scroll1 = new JScrollPane(list);
        final JScrollBar scrollBar = scroll1.getVerticalScrollBar();
        scrollBar.addAdjustmentListener(new AdjustmentListener() {

            @Override
            public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("JScrollBar's current value = " + scrollBar.getValue());
            }
        });
        add(scroll1);
        JScrollPane scroll2 = new JScrollPane(createPanel());
        add(scroll2);        
        final JScrollBar scrollBar1 = scroll2.getVerticalScrollBar();
        scrollBar1.addAdjustmentListener(new AdjustmentListener() {

            @Override
            public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("JScrollBar's current value = " + scrollBar1.getValue());
            }
        });

    }

    public static JPanel createPanel() {
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(0, 1, 1, 1));
        panel.add(createButtons("one"));
        panel.add(createButtons("two"));
        panel.add(createButtons("three"));
        panel.add(createButtons("four"));
        panel.add(createButtons("five"));
        panel.add(createButtons("six"));
        panel.add(createButtons("seven"));
        panel.add(createButtons("eight"));
        panel.add(createButtons("nine"));
        panel.add(createButtons("ten"));
        panel.add(createButtons("eleven"));
        panel.add(createButtons("twelwe"));
        return panel;
    }

    public static JButton createButtons(String text) {
        JButton button = new JButton(text);
        return button;
    }

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

            public void run() {
                ListPanel frame = new ListPanel();
                frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
                //frame.pack();
                frame.setSize(270, 200);
                frame.setVisible(true);
            }
        });
    }

    class PanelRenderer implements ListCellRenderer {

        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            JButton renderer = (JButton) value;
            renderer.setBackground(isSelected ? Color.red : list.getBackground());
            return renderer;
        }
    }
}

从输出的System.out.println（...）

run:
JScrollBar's current value = 0
JScrollBar's current value = 0
JScrollBar's current value = 1
JScrollBar's current value = 2
JScrollBar's current value = 3
JScrollBar's current value = 4
JScrollBar's current value = 5
JScrollBar's current value = 6
JScrollBar's current value = 7
JScrollBar's current value = 8
JScrollBar's current value = 9
JScrollBar's current value = 10
JScrollBar's current value = 11
JScrollBar's current value = 12
JScrollBar's current value = 13
JScrollBar's current value = 14
JScrollBar's current value = 15
JScrollBar's current value = 78
JScrollBar's current value = 143
JScrollBar's current value = 78
JScrollBar's current value = 0
JScrollBar's current value = 78
JScrollBar's current value = 143
BUILD SUCCESSFUL (total time: 10 seconds)

Answer 2:

假如你尝试添加setWheelScrollingEnabled（真/假），在你的JScrollPane中。

Answer 3:

我实际的问题是，我没有得到改变了鼠标滚轮改变滚动的价值，但我是越来越鼠标滚轮事件，所以我必须解决如下：

 private void scrollBarMouseWheelMoved(java.awt.event.MouseWheelEvent evt) {                                          
        if (evt.getUnitsToScroll() > 0) {
            scrollBar.setValue(scrollBar.getValue() + 1);
        } else {
            scrollBar.setValue(scrollBar.getValue() - 1);
        }
   }

每次我滚轮向上侧evt.getUnitsToScroll（）给出正值和用于向下它给出负值，所以我递增滚动条和东西其余部分的值通过自动处理

  private void scrollBarAdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) { 
     //my code...
}

文章来源: mouse wheel listener not working in jscrollbar