我在带有treeviewer的eclipse插件中有一个视图，我试图根据编辑器中使用ISelectionService的选择在TreeViewer中选择一行。我能够找到必须选择的元素，我在下面的代码片段中尝试了以下内容：
v.setExpandedState(file, true);
v.refresh();
v.setSelection(new StructuredSelection(iDialogSettings), true);
我还检查了Contentprovider的View，它返回了正确的父元素。
我在这里做错了什么？还有什么我需要检查和尝试？
我查了以下帖子：
https://alexandraniculai.wordpress.com/2010/08/14/when-jface-treeviewer-setselection-doesnt-work/
编辑：
查看 -
public class Objects extends ViewPart {
public static final String ID = "suitacore.views.Objects"; //$NON-NLS-1$
private TreeViewer v = null;
private Tree tree;
private List <IFile> outer;
private Action groupByDate;
public Objects() {
}
private void resizeTable(Tree table_) {
for (TreeColumn tc : table_.getColumns())
tc.pack();
}
/**
* Create contents of the view part.
* @param parent
*/
@Override
public void createPartControl(Composite parent) {
v = new TreeViewer(parent, SWT.FULL_SELECTION | SWT.V_SCROLL
| SWT.H_SCROLL | SWT.BORDER);
tree = v.getTree();
v.getTree().setLinesVisible(true);
v.getTree().setHeaderVisible(true);
v.getTree().setFont((new Font(null, "Calibri", 11, SWT.CENTER)));
String[] columLabels = {
" ObjectMaps ",
"ObjectReference",
"ObjectTagName",
"ObjectIDAttribute",
"ObjectNameAttribute",
"ObjectXPathAttribute",
"ObjectClassAttributes",
" ObjectText " ,
"MoreAttributes"};
for (int i = 0; i < columLabels.length; i++) {
TreeViewerColumn column = new TreeViewerColumn(v, SWT.NONE);
column.getColumn().setWidth(100);
column.getColumn().setMoveable(true);
column.getColumn().setText(columLabels[i]);
if (i == 1) {
column.setEditingSupport(new ObjectsViewTextCellEditingSupport(v));
}
}
IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IProject projects[] = root.getProjects();
outer = new ArrayList<IFile>();
for (IProject iProject : projects) {
IFolder objectMap = iProject.getFolder(ProjectConstants.objectMap);
if (null != objectMap) {
try {
for (IResource iResource : objectMap.members()) {
if (iResource instanceof IFile) {
IFile file = (IFile) iResource;
if (file.getFileExtension().equals("xml")) {
outer.add(file);
}
}
}
} catch (CoreException e) {
e.printStackTrace();
}
}
}
v.setContentProvider(new ObjectViewContentProvider(outer));
v.setLabelProvider(new ObjectViewLabelProvider());
v.setInput(outer);
createActions();
initializeToolBar();
initializeMenu();
resizeTable(tree);
getSite().setSelectionProvider(v);
ISelectionService ss = getSite().getWorkbenchWindow().getSelectionService();
ss.addPostSelectionListener(listener);
}
private Object searchObjectfromID(String objectID) {
Object iSection = null;
for (IFile file : outer) {
if (file.getFileExtension().equalsIgnoreCase("xml")) {
DialogSettings settings = new DialogSettings("root");
try {
settings.load(file.getLocation().toString());
IDialogSettings sections[] = settings.getSections();
for (IDialogSettings iDialogSettings : sections) {
if (iDialogSettings.getName().equals(objectID)) {
System.out.println("Dialog setting for the element>" + iDialogSettings.getName());
v.setExpandedState(file, true);
//v.setSelection(new StructuredSelection(file), true);
v.setSelection(new StructuredSelection(iDialogSettings), true);
v.refresh(true);
break;
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
return iSection;
}
/* adding listeners*/
private ISelectionListener listener = new ISelectionListener() {
public void selectionChanged(IWorkbenchPart sourcepart, ISelection selection) {
if (sourcepart != Objects.this) {
System.out.println("printing selection for object view ..." + selection);
if (selection instanceof IStructuredSelection) {
IStructuredSelection ss = (IStructuredSelection) selection;
Object element = ss.getFirstElement();
System.out.println("printing selected element for object view ..." + element);
if (element instanceof CSVRow) {
CSVRow row = (CSVRow) element;
System.out.println("here is our obejct id in the obejct view" + row.getElementAt(2));
final String objectID= row.getElementAt(2);
PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
public void run() {
searchObjectfromID(objectID);
}
});
}
}
}
}
};
/**
* Create the actions.
*/
private void createActions() {
// Create the actions
}
/**
* Initialize the toolbar.
*/
private void initializeToolBar() {
IToolBarManager toolbarManager = getViewSite().getActionBars()
.getToolBarManager();
}
/**
* Initialize the menu.
*/
private void initializeMenu() {
IMenuManager menuManager = getViewSite().getActionBars()
.getMenuManager();
}
@Override
public void setFocus() {
// Set the focus
}
}
ContentProvider：
public class ObjectViewContentProvider implements ITreeContentProvider {
private List <IFile> outer;
public ObjectViewContentProvider(List<IFile> outer) {
super();
this.outer = outer;
}
@Override
public void dispose() {
}
@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
}
@Override
public Object[] getElements(Object inputElement) {
return ((List) inputElement).toArray();
}
@Override
public Object[] getChildren(Object parentElement) {
Object obj[] = null;
if (parentElement instanceof IFile) {
System.out.println("get children called ObejctVewContentProvider......." + parentElement);
IFile file = (IFile) parentElement;
if (file.getFileExtension().equalsIgnoreCase("xml")) {
DialogSettings rootSection = new DialogSettings("root");
try {
rootSection.load(file.getLocation().toString());
obj = rootSection.getSections();
System.out.println("no of childeren for file parent>>" + obj.length );
}
catch (IOException e) {
e.printStackTrace();
}
}
}
else if (parentElement instanceof IDialogSettings) {
/*System.out.println("get children called ObejctVewContentProvider......." + parentElement);
IDialogSettings objects = (IDialogSettings) parentElement;
obj = objects.getSections();
System.out.println("no of childeren for IDialogsettings parent>>" + obj.length );*/
}
return obj;
}
@Override
public Object getParent(Object element) {
IFile ifile = null;
System.out.println("get parent called ObejctVewContentProvider........................" + element);
if (element instanceof IDialogSettings) {
System.out.println("ObejctVewContentProvider......>>>" + element);
IDialogSettings section = (IDialogSettings) element;
for (IFile file : outer) {
if (file.getFileExtension().equalsIgnoreCase("xml")) {
DialogSettings settings = new DialogSettings("root");
try {
settings.load(file.getLocation().toString());
IDialogSettings sections[] = settings.getSections();
for (IDialogSettings iDialogSettings : sections) {
if (iDialogSettings.getName().equals(section.getName())) {
ifile = file;
System.out.println("Returning parent for section >>" + ifile);
break;
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
else if (element instanceof DialogSettings) {
System.out.println("ObejctVewContentProvider......<<<<<<<<<<<<<<<<<<<<<<<<<<<" + element);
}
return ifile;
}
@Override
public boolean hasChildren(Object element) {
Object[] obj = getChildren(element);
return obj == null ? false : obj.length > 0;
}
}
答案 0 :(得分：0)
您似乎在正在执行选择的代码中再次加载DialogSettings，并使用新的对话框设置来设置选择。这不起作用，因为新加载的IDialogSettings对象与内容提供者返回的IDialogSettings对象不是同一对象。
如果实现了对象的equals和hashCode方法以使两个对象相等，则只能使用不同的对象 - IDialogSettings不是这种情况。
您应该使用内容提供商返回的相同IDialogSettings对象。
或者，您可以为查看者提供IElementComparer，其中包含以下方法：
public boolean equals(Object a, Object b);
public int hashCode(Object element);
您必须实现此操作才能使两个IDialogSetting对象相等并具有相同的哈希码。