Swt/Jface treeViewer的使用

上边介绍了，tableviewer，这里介绍一下treeViewer，总的流程类似。
一、构造一个树形结构的数据出来，这里选择国家、城市、人来构造一个树形结构，代码如下:
1，定义一个接口

packagemodel;

importjava.util.List;

publicinterfaceItree{
publicStringgetName();
publicvoidsetName(Stringname);
publicvoidsetChildren(ListChildren);
publicListgetChildren();
}

2，国家

packagemodel;

importjava.util.ArrayList;
importjava.util.List;

publicclassCountryimplementsItree{
privateLongid;
privateStringname;
privateListchildren=newArrayList();
publicCountry(){
}
publicCountry(Stringname){
this.name=name;
}
publicListgetChildren(){
returnchildren;
}
publicvoidsetChildren(Listchildren){
this.children=children;
}
publicLonggetId(){
returnid;
}
publicvoidsetId(Longid){
this.id=id;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}

}

3，城市

packagemodel;

importjava.util.ArrayList;
importjava.util.List;

publicclassCityimplementsItree{
privateLongid;
privateStringname;
privateListchildren=newArrayList();
publicCity(){
}
publicCity(Stringname){
this.name=name;
}
publicListgetChildren(){
returnchildren;
}
publicvoidsetChildren(Listchildren){
this.children=children;
}
publicLonggetId(){
returnid;
}
publicvoidsetId(Longid){
this.id=id;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
}

4，人

packagemodel;

importjava.util.ArrayList;
importjava.util.List;

publicclassPeopleimplementsItree{
privateLongid;
privateStringname;
publicPeople(){
}
publicPeople(Stringname){
this.name=name;
}
publicListgetChildren(){
returnnull;
}
publicvoidsetChildren(Listchildren){
}
publicLonggetId(){
returnid;
}
publicvoidsetId(Longid){
this.id=id;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
}

5,把这些元素组织起来

packagemodel;

importjava.util.ArrayList;
importjava.util.List;

publicclassFactory{
@SuppressWarnings("unchecked")
publicstaticListcreateTree(){
//生成国家
Countrycn=newCountry("中国");
Countryus=newCountry("美国");
Countryjp=newCountry("日本");
//生成城市
Citybeijing=newCity("北京");
Cityshanghai=newCity("上海");
Citynewyork=newCity("纽约");
Cityla=newCity("洛杉矶");
Citytokyo=newCity("东京");
Cityosaka=newCity("大阪");
//北京人
ArrayListlist=newArrayList();
list.add(newPeople("张三"));
list.add(newPeople("李四"));
list.add(newPeople("王五"));
beijing.setChildren(list);
//上海人
list=newArrayList();
list.add(newPeople("翠花"));
list.add(newPeople("小红"));
list.add(newPeople("小崔"));
shanghai.setChildren(list);
//纽约人
list=newArrayList();
list.add(newPeople("tom"));
list.add(newPeople("rose"));
list.add(newPeople("john"));
newyork.setChildren(list);
//洛杉矶人
list=newArrayList();
list.add(newPeople("Sofia"));
list.add(newPeople("sarah"));
list.add(newPeople("Jennifer"));
la.setChildren(list);
//东京人
list=newArrayList();
list.add(newPeople("渡边"));
list.add(newPeople("鬼冢"));
list.add(newPeople("山本"));
tokyo.setChildren(list);
//大阪人
list=newArrayList();
list.add(newPeople("奈奈子"));
list.add(newPeople("菜菜子"));
list.add(newPeople("新垣结衣"));
osaka.setChildren(list);

//关联城市与国家
//中国
ArrayListcitys=newArrayList();
citys.add(beijing);
citys.add(shanghai);
cn.setChildren(citys);
//美国
citys=newArrayList();
citys.add(newyork);
citys.add(la);
us.setChildren(citys);
//日本
citys=newArrayList();
citys.add(tokyo);
citys.add(osaka);
jp.setChildren(citys);
//国家列表
ArrayListcountrys=newArrayList();
countrys.add(cn);
countrys.add(us);
countrys.add(jp);
returncountrys;
}
}

二、定义内容器和标签器
1,内容器

importjava.util.List;

importmodel.Itree;

importorg.eclipse.jface.viewers.IStructuredContentProvider;
importorg.eclipse.jface.viewers.ITreeContentProvider;
importorg.eclipse.jface.viewers.Viewer;

publicclassTreeContentProviderimplementsIStructuredContentProvider,ITreeContentProvider{

publicObject[]getElements(ObjectinputElement){
if(inputElementinstanceofList){
Listinput=(List)inputElement;
returninput.toArray();
}
returnnewObject[0];
}
publicObject[]getChildren(ObjectparentElement){
Itreenode=(Itree)parentElement;
Listlist=node.getChildren();
if(list==null){
returnnewObject[0];
}
returnlist.toArray();
}

publicbooleanhasChildren(Objectelement){
Itreenode=(Itree)element;
Listlist=node.getChildren();
return!(list==null||list.isEmpty());
}
//以下三个函数根据需要填充
publicObjectgetParent(Objectelement){
returnnull;
}
publicvoidinputChanged(Viewerviewer,ObjectoldInput,ObjectnewInput){
}
publicvoiddispose(){
}
}

2，标签器：

importmodel.Itree;

importorg.eclipse.jface.viewers.ILabelProvider;
importorg.eclipse.jface.viewers.LabelProvider;
importorg.eclipse.swt.graphics.Image;

publicclassTreeLabelProviderextendsLabelProviderimplementsILabelProvider{
publicStringgetText(Objectelement){
Itreenode=(Itree)element;
returnnode.getName();
}
publicImagegetImage(Objectelement){
returnnull;
}
}

三、好了，准备工作做好了，把上边的内容利用起来就好了。

importmodel.Factory;

importorg.eclipse.jface.viewers.TreeViewer;
importorg.eclipse.swt.SWT;
importorg.eclipse.swt.layout.FillLayout;
importorg.eclipse.swt.widgets.Display;
importorg.eclipse.swt.widgets.Shell;
importorg.eclipse.swt.widgets.Tree;


publicclassTestTreeViewer{

privatestaticTreetree;
publicstaticvoidmain(String[]args){
finalDisplaydisplay=Display.getDefault();
finalShellshell=newShell();
shell.setSize(500,375);
shell.setText("SWTApplication");
//
finalTreeViewertreeViewer=newTreeViewer(shell,SWT.BORDER|SWT.H_SCROLL);
tree=treeViewer.getTree();
tree.setBounds(83,75,264,185);

treeViewer.setLabelProvider(newTreeLabelProvider());
treeViewer.setContentProvider(newTreeContentProvider());
treeViewer.setInput(Factory.createTree());

shell.open();
shell.setLayout(newFillLayout());
shell.layout();
while(!shell.isDisposed()){
if(!display.readAndDispatch())
display.sleep();
}
}

}

看看是不是已经实现了treeViewer
四、上边是简单的treeViewer，如果我们需要带checkbox的treeViewer，简单，只需要更改

finalTreeViewertreeViewer=newTreeViewer(shell,SWT.BORDER|SWT.H_SCROLL);

把TreeViewer换成CheckboxTreeViewer。这就是mvc的好处了。
但现实中我们多用ContainerCheckedTreeViewer代替CheckboxTreeViewer，因为这个提供了更多的功能。
CheckboxTreeViewer是TreeViewer的子类, ContainerCheckedTreeViewer是CheckboxTreeViewer的子类，所以可以随便替换。
替换后：

finalContainerCheckedTreeViewertreeViewer=newContainerCheckedTreeViewer(shell,SWT.BORDER|SWT.H_SCROLL);

五、treeviewer和tableviewer都介绍过了，考虑一下把两个结合起来是不是我们经常需要的情况。尝试一下吧。
六、souce下载:http://www.blogjava.net/Files/dreamstone/jface-6.rar