SWT的TreeVierer的使用

先看一下效果图：

代码结构是这样的:

好的，现在看一下代码：

package model;

import java.util.List;

public interface ITree {
   public String getName();
   public void setName(String name);
   public List getChildren();
   public void setChildren(List children);
}

首先定义接口。再实现两个类。

package model;

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

public class Country implements ITree{
    private String name;
    private List children=new ArrayList();
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<Member> getChildren() {
        return children;
    }
    public void setChildren(List children) {
        this.children = children;
    }

}

package model;

import java.util.List;

public class Member implements ITree{
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public List getChildren() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setChildren(List children) {
        // TODO Auto-generated method stub

    }

}

以List的形式组织树形结构：

package model;

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

public class Factory {
    public static List createTree(){

        Country mouseCountry=new Country();
        mouseCountry.setName("鼠球王国");
        Country dogCountry=new Country();
        dogCountry.setName("狗狗王国");

        Member mouseBuble=new Member();
        mouseBuble.setName("小鼠球");
        Member mouseGray=new Member();
        mouseGray.setName("小灰鼠");
        ArrayList list=new ArrayList();
        list.add(mouseBuble);
        list.add(mouseGray);
        mouseCountry.setChildren(list);

        Member dogBu=new Member();
        dogBu.setName("布布狗");
        Member dogBrick=new Member();
        dogBrick.setName("专狗");
        list=new ArrayList();
        list.add(dogBrick);
        list.add(dogBu);
        dogCountry.setChildren(list);

        ArrayList countryList=new ArrayList();
        countryList.add(mouseCountry);
        countryList.add(dogCountry);
        return countryList;

    }
}

实现他的两个Provider:

package com.test;

import java.util.List;

import model.ITree;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

public class TreeContentProvider implements IStructuredContentProvider,ITreeContentProvider{

    @Override
    public void dispose() {
        // TODO Auto-generated method stub

    }

    @Override
    public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
        // TODO Auto-generated method stub

    }

    @Override
    public Object[] getChildren(Object arg0) {
        // TODO Auto-generated method stub
        ITree tree=(ITree)arg0;
        List list=tree.getChildren();
        if(list!=null){
            return list.toArray();
        }
        return new Object[0];
    }

    @Override
    public Object getParent(Object arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean hasChildren(Object element) {
        // TODO Auto-generated method stub
        ITree tree=(ITree)element;
        List list=tree.getChildren();

        return !(list==null || list.isEmpty());
    }

    @Override
    public Object[] getElements(Object arg0) {
        // TODO Auto-generated method stub
        if(arg0 instanceof List){
            List list=(List)arg0;
            return list.toArray();
        }
        return new Object[0];
    }

}

package com.test;

import model.ITree;

import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;
public class TreeLabelProvider extends LabelProvider implements ILabelProvider{
    public String getText(Object element){
        ITree node=(ITree)element;
        return node.getName();
    }
    public Image getImage(Object element){
        return null;
    }
}

最后是总的，将他们联系在一起：

package com.test;

import model.Factory;

import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class LBMShow {

    public static void main(String[] args) {
        final Display display=Display.getDefault();
        final Shell shell=new Shell();
        shell.setSize(500,500);
        shell.setText("TreeTable");

        final TreeViewer treeViewer=new TreeViewer(shell, SWT.BORDER | SWT.SCROLL_PAGE);

        treeViewer.setContentProvider(new TreeContentProvider());
        treeViewer.setLabelProvider(new TreeLabelProvider());
        treeViewer.setInput(Factory.createTree()); //这里可以将List的结构以树形结构显示出来。

        shell.pack();
        shell.open();
        shell.setLayout(new FillLayout());   //没这句话竟然出不来效果!
        shell.layout();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }

}

//******************************************************************************************************************************

需要注意的是，要添加如下的包：