JScrollPane 中的滚动条不适用于 JTables

Question

我有一个 JScrollPane，里面有许多巨大的 JTable。

当我通过鼠标滚动向下滚动 JScrollPane 时，当鼠标指针经过 JTable 时它就会停止。 （即滚动条仅在 B 区域有效，但在 A 区域无效。）

如何避免这种情况？谢谢。

这是代码：

/*
 * test.java
 *
 * Created on Jun 26, 2011, 7:39:43 PM
 */
package collector;

import javax.swing.JScrollPane;

/**
 *
 * @author Bhathiya
 */
public class test extends javax.swing.JFrame {

    /** Creates new form test */
    public test() {
        initComponents();
        jScrollPane2.setWheelScrollingEnabled( false );
        jScrollPane3.setWheelScrollingEnabled( false );
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jPanel1 = new javax.swing.JPanel();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jScrollPane3 = new javax.swing.JScrollPane();
        jTable2 = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jScrollPane1.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

        jScrollPane2.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        jScrollPane2.setVerticalScrollBarPolicy(javax.swing.ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jTable1.setAutoscrolls(false);
        jScrollPane2.setViewportView(jTable1);

        jScrollPane3.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        jScrollPane3.setVerticalScrollBarPolicy(javax.swing.ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);

        jTable2.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jTable2.setAutoscrolls(false);
        jTable2.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
        jScrollPane3.setViewportView(jTable2);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jScrollPane3, javax.swing.GroupLayout.Alignment.LEADING, 0, 0, Short.MAX_VALUE)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 374, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(151, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 298, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 131, Short.MAX_VALUE)
                .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 168, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(194, 194, 194))
        );

        jScrollPane1.setViewportView(jPanel1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 544, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new test().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JScrollPane jScrollPane3;
    private javax.swing.JTable jTable1;
    private javax.swing.JTable jTable2;
    // End of variables declaration
}

Answer 1

这可能是因为每个表都有自己的 JScrollPane （至少表 C 是这样）。当鼠标位于表格内时，最里面的滚动窗格是对鼠标滚轮做出反应的滚动窗格。我认为你不应该修改它：这是正常行为。

编辑：

这很丑陋，但我不确定是否还有其他方法可以做到这一点。我已经能够通过删除由 UI 添加到滚动窗格的侦听器来使您的示例正常工作（即使禁用滚轮滚动）：

for (MouseWheelListener listener : jScrollPane2.getMouseWheelListeners()) {
    jScrollPane2.removeMouseWheelListener(listener);
}
// same for jScrollPane3

这并不优雅，但在可滚动面板内有多个可滚动表也不是。

Answer 2

我有一个 JScrollPane，里面有许多巨大的 JTable。

我假设每个子表也都添加到 JScrollPane 中。如果是这样，则滚动事件将传递到这些滚动窗格而不是向外滚动窗格。因此，您需要

scrollPane.setWheelScrollingEnabled( false );

在主滚动窗格中包含的每个滚动窗格上使用：。

更新：

问题是，即使滚轮已被禁用，滚动窗格也会拦截所有 mouseScrolled 事件，并且它们不会传递到父滚动窗格。所以解决方案是不要将表添加到滚动窗格中。而是使用带有 BorderLayout 的 JPanel。像这样的东西：

import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableMultiple extends JPanel
{
    public TableMultiple()
    {
        setLayout( new BorderLayout() );
        Box box = Box.createVerticalBox();
        box.add(Box.createVerticalStrut(50));

        JPanel panel = new JPanel( new BorderLayout() );
        JTable table = new JTable(10, 5);
        panel.add(table.getTableHeader(), BorderLayout.NORTH);
        panel.add(table);
        box.add( panel );

        box.add(Box.createVerticalStrut(50));

        JTable table2 = new JTable(100, 5);
        table2.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane2 = new JScrollPane( table2 );
        box.add( scrollPane2 );

        box.add(Box.createVerticalStrut(50));

        JTable table3 = new JTable(10, 5);
        box.add( table3 );

        box.add(Box.createVerticalStrut(50));

        add( new JScrollPane(box) );
    }

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("TableMultiple");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new TableMultiple() );
        frame.setSize(400, 500);
        frame.setLocationRelativeTo( null );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

Answer 3

我只需使用 Eclipse 可视化编辑器即可完成此操作。不过 VE 项目刚刚结束。我喜欢只编写重要的 Swing 内容，而不是每个 JLabel...