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我想在我的RCP應用程序中構建一個視圖，該視圖只包含一個TreeViewer。JFace與TreeViewer的數據綁定
樹可以包含文件夾或葉子，文件夾可以包含文件夾和葉子。當我將文件夾添加到根文件夾的後端數據模型時，UI會自動更新，但是如果我將文件夾添加到任何分支文件夾，UI將不會自動更新。請告訴我我的代碼有什麼問題。
模型類：
public class TreeNode extends BindableObject {
private Folder parent;
private String name;
public String getName() {
return name;
}
public void setName(String name) {
super.firePropertyChange("name", this.name, this.name = name);
}
public Folder getParent() {
return parent;
}
public void setParent(Folder parent) {
this.parent = parent;
}
}
public class Folder extends TreeNode {
private List<TreeNode> children = new ArrayList<TreeNode>();
public List<TreeNode> getChildren() {
return children;
}
public void setChildren(List<TreeNode> children) {
this.children = children;
}
public void add(TreeNode node){
children.add(node);
}
}
視圖：
public class ExplorerView extends ViewPart {
private WritableList data;
private TreeViewer treeViewer;
public WritableList getData() {
return data;
}
public TreeViewer getViewer(){
return treeViewer;
}
public ExplorerView() {
// TODO Auto-generated constructor stub
}
@Override
public void createPartControl(Composite parent) {
parent.setLayout(new FillLayout(SWT.HORIZONTAL));
treeViewer = new TreeViewer(parent, SWT.BORDER);
treeViewer.setContentProvider(new ObservableListTreeContentProvider(new ExplorerObservableFactory(), new ExploerTreeStructureAdvisor()));
treeViewer.setLabelProvider(new ExplorerTreeLabelProvider());
ArrayList<TreeNode> list = new ArrayList<TreeNode>();
list.add(new ExplorerDataModel().getElements()[0]);
data = new WritableList(list, TreeNode.class);
treeViewer.setInput(data);
}
@Override
public void setFocus() {
}
}
的ObservableFactory：
public class ExplorerObservableFactory implements IObservableFactory {
@Override
public IObservable createObservable(Object target) {
System.out.println(target.getClass().getName());
if(target instanceof WritableList){
return (WritableList)target;
}
else if(target instanceof Folder){
List<TreeNode> children = ((Folder)target).getChildren();
return new WritableList(children, TreeNode.class);
}
return null;
}
}
的TreeStructureAdvisor：
public class ExploerTreeStructureAdvisor extends TreeStructureAdvisor {
@Override
public Object getParent(Object element) {
return ((TreeNode)element).getParent();
}
@Override
public Boolean hasChildren(Object element) {
if(element instanceof Folder){
return true;
}else{
return false;
}
}
}
數據：
public class ExplorerDataModel {
public TreeNode[] getElements() {
Folder f1 = new Folder();
f1.setName("Database Connections");
Folder f11 = new Folder();
f11.setName("Credit Test");
TreeNode t1 = new TreeNode();
t1.setName("[email protected]");
f11.add(t1);
t1.setParent(f11);
TreeNode t2 = new TreeNode();
t2.setName("[email protected]");
f11.add(t2);
t2.setParent(f11);
Folder f12 = new Folder();
f12.setName("Credit Product");
TreeNode t3 = new TreeNode();
t3.setName("[email protected]");
f12.add(t3);
t3.setParent(f12);
TreeNode t4 = new TreeNode();
t4.setName("[email protected]");
f12.add(t4);
t4.setParent(f12);
f1.add(f11);
f11.setParent(f1);
f1.add(f12);
f12.setParent(f1);
return new TreeNode[] { f1 };
}
}
測試命令處理程序：
public Object execute(ExecutionEvent event) throws ExecutionException {
ExplorerView v =(ExplorerView) HandlerUtil.getActiveWorkbenchWindow(event).getActivePage().findView("com.amarsoft.dmp.explorer.explorerView");
Folder f = new Folder();
f.setName("ODA Flat Files");
v.getData().add(f);
Folder f1 = (Folder) v.getData().get(0);
f1.setName("Database Connections (3)");
Folder f2 = new Folder();
f2.setName("Report Test");
f1.add(f2);
return null;
}
如果我執行上面的命令，添加文件夾「ODA平面文件」將立即出現在樹中，但添加文件夾「報告測試」不會在那裏，如果撥打TreeViewer#refresh()一切都好，但我想知道爲什麼。
數據綁定背後的想法是使JFace的模型和其他模型（在這個例子中的javabean）保持同步......我覺得你仍然需要調用方法刷新... – Matteo