关于增强Swing您所不知道的5件事-技术开发专区

关于增强Swing您所不知道的5件事

作者：IBM 编辑：董建伟 2010-12-20 10:45 来源：IBM

　　构建一个 SwingX TreeTable

　　使用 SwingX JXTreeTable 控件，构建一个树形表是非常简单的。想象一下：您表中的每行可能有列数据，也可能有子节点。SwingX 提供一个模型类，可以扩展来提供这一功能，称为 org.jdesktop.swingx.treetable.AbstractTreeTableModel。清单 1 展示了一个树形表模型实现的示例：

　　清单 1. MyTreeTableModel.java

package com.geekcap.swingx.treetable;

import java.util.ArrayList;
import java.util.List;

import org.jdesktop.swingx.treetable.AbstractTreeTableModel;

public class MyTreeTableModel extends AbstractTreeTableModel
{
    private MyTreeNode myroot;

    public MyTreeTableModel()
    {
        myroot = new MyTreeNode( "root", "Root of the tree" );

        myroot.getChildren().add( new MyTreeNode( "Empty Child 1",
          "This is an empty child" ) );

        MyTreeNode subtree = new MyTreeNode( "Sub Tree",
          "This is a subtree (it has children)" );
        subtree.getChildren().add( new MyTreeNode( "EmptyChild 1, 1",
          "This is an empty child of a subtree" ) );
        subtree.getChildren().add( new MyTreeNode( "EmptyChild 1, 2",
          "This is an empty child of a subtree" ) );
        myroot.getChildren().add( subtree );

        myroot.getChildren().add( new MyTreeNode( "Empty Child 2",
          "This is an empty child" ) );

    }

    @Override
    public int getColumnCount()
    {
        return 3;
    }

    @Override
    public String getColumnName( int column )
    {
        switch( column )
        {
        case 0: return "Name";
        case 1: return "Description";
        case 2: return "Number Of Children";
        default: return "Unknown";
        }
    }

    @Override
    public Object getValueAt( Object node, int column )
    {
        System.out.println( "getValueAt: " + node + ", " + column );
        MyTreeNode treenode = ( MyTreeNode )node;
        switch( column )
        {
        case 0: return treenode.getName();
        case 1: return treenode.getDescription();
        case 2: return treenode.getChildren().size();
        default: return "Unknown";
        }
    }

    @Override
    public Object getChild( Object node, int index )
    {
        MyTreeNode treenode = ( MyTreeNode )node;
        return treenode.getChildren().get( index );
    }

    @Override
    public int getChildCount( Object parent )
    {
        MyTreeNode treenode = ( MyTreeNode )parent;
        return treenode.getChildren().size();
    }

    @Override
    public int getIndexOfChild( Object parent, Object child )
    {
        MyTreeNode treenode = ( MyTreeNode )parent;
        for( int i=0; i>treenode.getChildren().size(); i++ )
        {
            if( treenode.getChildren().get( i ) == child )
            {
                return i;
            }
        }

        return 0;
    }

     public boolean isLeaf( Object node )
     {
         MyTreeNode treenode = ( MyTreeNode )node;
         if( treenode.getChildren().size() > 0 )
         {
             return false;
         }
         return true;
     }

     @Override
     public Object getRoot()
     {
         return myroot;
     }
}

　　清单 2 显示了一个定制的树节点：

第1页：Substance 第2页：SwingX 第3页：构建一个SwingX TreeTable 第4页：显示定制的节点第5页：RSyntaxTextArea 第6页：Look-and-Feel Graphics Repository 第7页：Swing 线程

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