I am Trying to create Eclipse Plugin which has a composite with two TreeViewer side by side. On click of each TreeViewer content Eclipse property view should give appropriate information. Now I wanted to set Selection provider for both of this treeviewer hence I used
setSelectionProvider(treeViewer1)
setSelectionProvider(treeviewer2)
But only the second added treeviewer get set since the first one is overwritten. I am intiating this two treeviewer from class Queue.java. Hence I implemented the interface ISelectionProvider over Queue.java as below:
public void addSelectionChangedListener(ISelectionChangedListener listener)
{
selectionChangedListeners.add(listener);
}
public void
removeSelectionChangedListener(ISelectionChangedListener listener)
{
selectionChangedListeners.remove(listener);
}
private void fireSelectionChanged(final SelectionChangedEvent event)
{
Object[] listeners = selectionChangedListeners.getListeners();
for (int i = 0; i < listeners.length; ++i)
{
final ISelectionChangedListener l =
(ISelectionChangedListener) listeners[i];
Platform.run(new SafeRunnable()
{
public void run()
{
l.selectionChanged(event);
}
#Override
public void handleException(Throwable e)
{
removeSelectionChangedListener(l);
}
});
}
}
public void setSelection(ISelection selection)
{
fireSelectionChanged(new SelectionChangedEvent(this, selection));
}
public ISelection getSelection()
{
ArrayList<Object> list = new ArrayList<Object>();
Object o = getProperties();
if (o instanceof IPropertySource)
list.add(o);
return new StructuredSelection(list);
}
Can anyone help me how to resolve this issue. I will be grateful. thanks in advance. Tor.
Your view would have to write a selection provider wrapper or mediator that would delegate to the viewer that currently had focus. Then your view would set it up something like this:
SelectionProviderWrapper wrapper = new SelectionProviderWrapper();
wrapper.addViewer(treeViewer1);
wrapper.addViewer(treeViewer2);
getSite().setSelectionProvider(wrapper);
I would check out org.eclipse.jdt.internal.ui.viewsupport.SelectionProviderMediator for an example of a selection provider for multiple JFace viewers.
Related
I am trying to construct a DataGrid in GWT that will show an arbitrary dataset taken from an rpc method.
I have done some progress as I get the fields from a method and the data from another.
I have managed to construct the Datagrid and add the columns from the rpc.getFields() method and fill the table using an AsyncDataProvider.
The problem is that when I refresh the browser, it duplicates all the columns at the Datagrid. I cannot figure out what to do. I tried to remove first all the columns but no luck.
I attach the code if anyone have an idea.
public class MyCallBack implements AsyncCallback<List<Field>> {
DataGrid<Record> dg;
public MyCallBack(DataGrid<Record> dgrid) {
this.dg=dgrid;
}
public void onFailure(Throwable caught) {
Window.alert(caught.getMessage());
}
public void onSuccess(List<Field> result) {
for (int i=0;i<=result.size();i++) {
IndexedColumn ic = new IndexedColumn(i);
dg.addColumn(ic, result.get(i).getLabel());
}
}
public AsyncCallback<List<Field>> getCb() {
return this;
}
public void onModuleLoad() {
final DataGrid<Record> dg = new DataGrid<Record>();
MyCallBack mcb = new MyCallBack(dg);
DataProvider dp = new DataProvider();
DBConnectionAsync rpcService = (DBConnectionAsync) GWT.create(DBConnection.class);
ServiceDefTarget target = (ServiceDefTarget) rpcService;
String moduleRelativeURL = GWT.getModuleBaseURL() + "MySQLConnection";
target.setServiceEntryPoint(moduleRelativeURL);
rpcService.getFields(mcb.getCb());
dp.addDataDisplay(dg);
dg.setVisibleRange(0, 200);
SplitLayoutPanel slp = new SplitLayoutPanel();
slp.setHeight("700px");
slp.setWidth("1500px");
slp.addWest(dg, 770);
RootPanel.get().add(slp);
}
When you refresh a browser, all UI is lost. There is no difference between (a) show the UI for the first time or (b) show the UI after browser refresh.
Your comment "Only if I restart tomcat it works" suggests that the problem is on the server side. Most likely, you return twice the number of data points on a second call.
Try clearing the table before filling it like this:
public void onSuccess(List<Field> result) {
clearTable();
for (int i=0;i<=result.size();i++) {
IndexedColumn ic = new IndexedColumn(i);
dg.addColumn(ic, result.get(i).getLabel());
}
}
private void clearTable(){
while (dg.getColumnCount() > 0) {
db.removeColumn(0);
}
}
I want to implement a row deletion logic in a Nebula Nattable.
This is what I plan to do:
Add context menu to the Nattable which is described in http://blog.vogella.com/2015/02/03/nattable-context-menus-with-eclipse-menus/
Add an SWT Action to the menu which will implement the delete
my question is, which is the best way to accomplish this:
Should I delete the corresponding value from my data model and the table view is refreshed when I execute this.natview.refresh();?
OR
Should I get the rows from SelectionLayer and delete them (if so how do I do ?)?
OR
is there any default support for this function through IConfiguration?
In NatTable you would typically do the following:
Create a command for deleting a row
public class DeleteRowCommand extends AbstractRowCommand {
public DeleteRowCommand(ILayer layer, int rowPosition) {
super(layer, rowPosition);
}
protected DeleteRowCommand(DeleteRowCommand command) {
super(command);
}
#Override
public ILayerCommand cloneCommand() {
return new DeleteRowCommand(this);
}
}
Create a command handler for that command
public class DeleteRowCommandHandler<T> implements ILayerCommandHandler<DeleteRowCommand> {
private List<T> bodyData;
public DeleteRowCommandHandler(List<T> bodyData) {
this.bodyData = bodyData;
}
#Override
public Class<DeleteRowCommand> getCommandClass() {
return DeleteRowCommand.class;
}
#Override
public boolean doCommand(ILayer targetLayer, DeleteRowCommand command) {
//convert the transported position to the target layer
if (command.convertToTargetLayer(targetLayer)) {
//remove the element
this.bodyData.remove(command.getRowPosition());
//fire the event to refresh
targetLayer.fireLayerEvent(new RowDeleteEvent(targetLayer, command.getRowPosition()));
return true;
}
return false;
}
}
Register the command handler to the body DataLayer
bodyDataLayer.registerCommandHandler(
new DeleteRowCommandHandler<your type>(bodyDataProvider.getList()));
Add a menu item to your menu configuration that fires the command
new PopupMenuBuilder(natTable)
.withMenuItemProvider(new IMenuItemProvider() {
#Override
public void addMenuItem(NatTable natTable, Menu popupMenu) {
MenuItem deleteRow = new MenuItem(popupMenu, SWT.PUSH);
deleteRow.setText("Delete");
deleteRow.setEnabled(true);
deleteRow.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent event) {
int rowPosition = MenuItemProviders.getNatEventData(event).getRowPosition();
natTable.doCommand(new DeleteRowCommand(natTable, rowPosition));
}
});
}
})
.build();
Using this you don't need to call NatTable#refresh() because the command handler fires a RowDeleteEvent. I also don't suggest to call NatTable#refresh() in such a case, as it might change and refresh more than it should and would not update other states correctly, which is done correctly by firing the RowDeleteEvent.
Note that the shown example deletes the row for which the context menu is opened. If all selected rows should be deleted, you should create a command handler that knows the SelectionLayer and retrieve the selected rows as shown in the other answer.
In our application we do the following:
Get selected row objects:
SelectionLayer selectionLayer = body.getSelectionLayer();
int[] selectedRowPositions = selectionLayer.getFullySelectedRowPositions();
Vector<Your Model Objects> rowObjectsToRemove = new Vector<Your Model Objects>();
for (int rowPosition : selectedRowPositions) {
int rowIndex = selectionLayer.getRowIndexByPosition(rowPosition);
rowObjectsToRemove .add(listDataProvider.getRowObject(rowIndex));
}
Remove them from the data provider
call natTable.refresh()
I am creating an Eclipse RCP application with multiple views. One of my views is a multi-page editor view. Each of those pages has a a master/details block. I need to register all of those TableViewers as selection providers for my other view to listen to.
After much research online, I came across this article about multiple selection providers in a single view. I followed the instructions to create this selection provider for multiple viewers.
class MyMultipleSelectionProvider implements ISelectionProvider {
private final ListenerList selectionListeners = new ListenerList();
private ISelectionProvider delegate;
private final ISelectionChangedListener selectionListener = new ISelectionChangedListener() {
#Override
public void selectionChanged(final SelectionChangedEvent event) {
if (event.getSelectionProvider() == AdaptabilityProfileSelectionProvider.this.delegate) {
fireSelectionChanged( event.getSelection() );
}
}
};
/**
* Sets a new selection provider to delegate to. Selection listeners
* registered with the previous delegate are removed before.
*
* #param newDelegate new selection provider
*/
public void setSelectionProviderDelegate(final ISelectionProvider newDelegate) {
if (this.delegate == newDelegate) {
return;
}
if (this.delegate != null) {
this.delegate.removeSelectionChangedListener(this.selectionListener);
}
this.delegate = newDelegate;
if (newDelegate != null) {
newDelegate.addSelectionChangedListener(this.selectionListener);
fireSelectionChanged(newDelegate.getSelection());
}
}
#Override
public void addSelectionChangedListener(final ISelectionChangedListener listener) {
this.selectionListeners.add(listener);
}
#Override
public ISelection getSelection() {
return this.delegate == null ? null : this.delegate.getSelection();
}
#Override
public void removeSelectionChangedListener(final ISelectionChangedListener listener) {
this.selectionListeners.remove(listener);
}
#Override
public void setSelection(final ISelection selection) {
if (this.delegate != null) {
this.delegate.setSelection(selection);
}
}
protected void fireSelectionChanged(final ISelection selection) {
fireSelectionChanged(this.selectionListeners, selection);
}
private void fireSelectionChanged(final ListenerList list, final ISelection selection) {
final SelectionChangedEvent event = new SelectionChangedEvent(this.delegate, selection);
final Object[] listeners = list.getListeners();
for (int i = 0; i < listeners.length; i++) {
final ISelectionChangedListener listener = (ISelectionChangedListener) listeners[i];
listener.selectionChanged(event);
}
}
}
I added a focusListener on all of the edior's viewers so they become the delegate:
tree.addFocusListener(new FocusAdapter() {
#Override
public void focusGained(final FocusEvent e) {
editor.getSelectionProvider().setSelectionProviderDelegate(MyEditorPage.this.treeViewer);
}
});
And I registered this as the selection provider for my editor:
site.setSelectionProvider( this.selectionProvider );
Then, within my view that needs to hear about the selection, I registered a selection listener for this editor:
getSite().getPage().addSelectionListener(MyEditor.ID, this.selectionListener);
When I run the application, I see that the delegate is being changed and the selection events are being fired. However, the listener list is empty.
I am never calling addSelectionChangeListener() directly. I was under the impression that that was what the selection service is for. Am I wrong? Should I be calling it? If so, when? If not, who is supposed to be adding the listener, and why isn't it happening?
If your code is based on FormEditor (or MultiPageEditorPart) then the selection provider is set to MultiPageSelectionProvider at the end of the init method. This may be overriding your site.setSelectionProvider call.
Using:
#Override
public void init(IEditorSite site, IEditorInput input)
throws PartInitException {
super.init(site, input);
site.setSelectionProvider(this.selectionProvider);
}
should make sure your provider is the one used.
I am developing a RCP application with a TreeViewer. While there are good number of articles to explain how to add editing support to the Viewer (and how changes in view are updated in the model), I don't find much for updating the Treeview when the underlaying model changes. my question in short:
TreeView ----> Model updation ------ there are lots of examples
Model ----> Treeview updation ----- this is my question
Edit:
This is what I tried and it works. comments please
viewer.getTree().addKeyListener(new KeyListener(){
#Override
public void keyPressed(KeyEvent e) {
}
#Override
public void keyReleased(KeyEvent e) {
if(e.keyCode==SWT.F3){
System.out.println("F3 pressed... new element will be added");
TreeParent root = (TreeParent) viewer.getInput();
TreeParent activityRoot = (TreeParent) root.getChildren()[0];
activityRoot.addChild(new TreeObject("NEW_ACTIVITY"));
//viewer.update(root, null);
viewer.refresh();
}
}
});
The data model is provided by your content provider, TreeViewer does not provide any means of changing this data - you must do that it your own code. When you have changed to model you can use the following methods to tell the TreeViewer about the change:
If you have just changed what needs to be shown for a single item in the tree use
TreeViewer.update(object, null);
to get that item in the tree updated. There is also an array version of this to update multiple objects.
If you have added or removed objects in the tree use
TreeViewer.refresh();
to rebuild the whole tree or
TreeViewer.refresh(object);
to refresh the part of the tree start at object.
To tell the tree about adding and removing objects there are
TreeViewer.add(parent, object);
TreeViewer.remove(object);
there are also array variants of these.
To help the TreeViewer find the objects call
TreeViewer.setUseHashlookup(true);
(must be called before TreeViewer.setInput). Since this uses a hash table the objects should have sensible hashCode and equals methods. You can also use TreeViewer.setComparer to specify a different class to do the hash code and comparison.
Based on the comments in this thread,one of the eclipse corner articles on using TreeViewer and few experimenting I had created a working model.
Here are the steps:
Create a listener interface like the following
public interface TreeModelListener extends EventListener {
public void onDelete(TreeObject obj);
}
Let the tree Content provider to add listeners to each tree model item and implement this interface like below
public class TreeContentProvider implements IStructuredContentProvider,ITreeContentProvider,TreeModelListener {
TreeViewer tv;
public TreeContentProvider(TreeViewer tv){
this.tv=tv;
}
int cnt=0;
public void inputChanged(Viewer v, Object oldInput, Object newInput) {
cnt ++;
System.out.println("inputChanged() called "+oldInput+" new: "+newInput);
if(newInput!=null){
((TreeParent)newInput).setListener(this);
TreeObject []items = ((TreeParent)newInput).getChildren();
for(TreeObject obj : items){
if(obj instanceof TreeParent){
((TreeParent) obj).setListener(this);
}
}
}
}
....
#Override
public void onDelete(TreeObject obj) {
System.out.println("Delete of "+obj+" handled by content handler ");
TreeParent parent = obj.getParent();
if(parent.getChildren().length<=1){
return;
}
parent.removeChild(obj);
this.tv.refresh();
}
}
Add a method to the TreeModel class as below . And obviously TreeParent class should have an ArrayList of listeners that is being used in #1 above
public void fireChildDelete(final TreeObject obj){
if(this.listener!=null){
new Runnable(){
#Override
public void run() {
System.out.println("New thread spawned with ID "+Thread.currentThread().getId());
listener.onDelete(obj);
}
}.run();
}
}
Finally add KeyListener to the TreeViewer Object to handle Delete key as below:
tv.getTree().addKeyListener(new KeyListener(){
#Override
public void keyPressed(KeyEvent e) {
}
#Override
public void keyReleased(KeyEvent e) {
if(e.keyCode==SWT.F3){
System.out.println("F3 pressed... new element will be added");
TreeParent root = (TreeParent) tv.getInput();
TreeParent activityRoot = (TreeParent) root.getChildren()[0];
activityRoot.addChild(new TreeObject("NEW_ACTIVITY"));
//viewer.update(root, null);
tv.refresh();
}
if(e.keyCode==SWT.DEL){
System.out.println("DEL key pressed... element will be deleted "+((Tree)e.getSource()).getSelection().length);
if(((Tree)e.getSource()).getSelection().length>0){
final IStructuredSelection selection = (IStructuredSelection) tv
.getSelection();
System.out.println("DEL#2 key pressed... element will be deleted "+selection.getFirstElement().getClass());
TreeParent parent = ((TreeObject)selection.getFirstElement()).getParent();
parent.fireChildDelete((TreeObject) selection.getFirstElement());
//tv.remove(selection.getFirstElement());
//viewer.update(viewer.getInput(),null);
//tv.refresh();
}
}
}
});
I am developing an Eclipse plug-in that has currently 2 views. In my first view I have a list of connections displayed in a TableViewer (name and connection status).In my second view I want to load the tables in a database (the connection). This loading will be done by clicking a menu item on a connection ("view details"). These tables will be displayed in a TreeViewer because they can also have children. I have tried to do it this way:
My View class:
public class DBTreeView extends ViewPart {
private TreeViewer treeViewer;
private Connection root = null;
public DBTreeView() {
Activator.getDefault().setDbTreeView(this);
}
public void createPartControl(Composite parent) {
treeViewer = new TreeViewer(parent);
treeViewer.setContentProvider(new DBTreeContentProvider());
treeViewer.setLabelProvider(new DBTreeLabelProvider());
}
public void setInput(Connection conn){
root = conn;
treeViewer.setInput(root);
treeViewer.refresh();
}
}
I made a setInput method that is called from the action registered with the menu item in the connections view with the currently selected connection as argument:
MViewContentsAction class:
public void run(){
selectedConnection = Activator.getDefault().getConnectionsView().getSelectedConnection();
Activator.getDefault().getDbTreeView().setInput(selectedConnection);
}
In my ContentProvider class:
public Object[] getChildren(Object arg0) {
if (arg0 instanceof Connection){
return ((Connection) arg0).getTables().toArray();
}
return EMPTY_ARRAY;
}
where EMPTY_ARRAY is an...empty array
The problem I'm facing is that when in debug mode, this piece of code is not executed somehow:
Activator.getDefault().getDbTreeView().setInput(selectedConnection);
And also nothing happens in the tree view when clicking the menu item. Any ideas?
Thank you
Huh. Ok, what you're doing here is.. not really the right way. What you should be doing is registering your TableViewer as a selection provider.
getSite().setSelectionProvider(tableViewer);
Then, define a selection listener and add it to the view with the tree viewer like this:
ISelectionListener listener = new ISelectionListener() {
public void selectionChanged(IWorkbenchPart part, ISelection sel) {
if (!(sel instanceof IStructuredSelection))
return;
IStructuredSelection ss = (IStructuredSelection) sel;
// rest of your code dealing with checking whether selection is what is
//expected and if it is, setting it as an input to
//your tree viewer
}
};
public void createPartControl(Composite parent) {
getSite().getPage().addSelectionListener(listener);
}
Now your tree viewer's input will be changed according to what is selected in the table viewer (btw, don't forget to call treeviewer.refresh() after you set new input).
See an example here.