Passing parameters while showing a view in Eclipse RCP

1
votes

I am creating eclipse RCP application and I am stuck with passing parameter while showing a view. As the first approach, I tried setting a static variable in View2 from View1 and opened that view (as below). It works. 

IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();               
String viewIdToClose = studentListView.ID;
IViewPart viewToClose = activePage.findView(viewIdToClose);
TableItem item = studentTable.getItem(studentTable.getSelectionIndex());
String text = item.getText(ListViewConstants.TABLE_COLUMN_ONE);
activePage.hideView(viewToClose);
try {
    String viewIdToOpen = StudentReview.ID;
    StudentReview.userId = text;
     activePage.showView(viewIdToOpen);                 
} catch (PartInitException e) {...}

As this doesn't seem to be a good approach, I tried as per the suggestion mentioned in the below link(accepted answer). Passing parameters to the view . In this approach, we can pass parameters only after showing the view.

But the issue I have is, the view to be opened should have the value from selected row while calling showView() i.e, I want to populate the parameters in View 2 based on View 1's selection. Is there any way to achieve this? Is it good to use PULL instead of PUSH approach? Any suggestion is appreciated. Thanks!!!

UPDATE 1: Approach mentioned in Passing parameters to the view Interface:

public interface ICommunicationView extends IViewPart{
   public void accept(Object parameter);
}

Calling accept():

IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
String viewIdToClose = StudentListView.ID;
IViewPart viewToClose = activePage.findView(viewIdToClose);
TableItem item = studentTable.getItem(studentTable.getSelectionIndex());
String text = item.getText(ListViewConstants.TABLE_COLUMN_ONE);
activePage.hideView(viewToClose);
try {
   String viewIdToOpen = StudentReview.ID;
   ICommunicationView viewToOpen = (ICommunicationView) activePage.showView(viewIdToOpen);
   viewToOpen.accept(text);//Sending userId to Review view
} catch (PartInitException e) { ... }

StudentReviewView:

private String studentId;
//getters and setters
@Override
public void accept(Object parameter) {
  setStudentId(parameter.toString());
}

public void createPartControl(final Composite parent) {
   ...
  System.out.println("Student Id" + this.getStudentId());    
}

It prints Student Id as null.

Am I missing something obvious?

Thanks!

3
javaeclipseeclipse-plugineclipse-rcp
Why doesn't the accepted answer on the link you mentioned solve your problem? If you send userId to StudentReviewView after calling showView it will be populated right after being opened, won't it? - Mario Marinato
Actually I store student data in XML files with the name <studentId>.xml. In createPartControl() of review view, I will unmarshall the corresponding XML file and populate the components. For that I need studentId while calling createPartControl(). In this case I am getting student ID as null, as createPartControl() is called before sending student ID. I have updated my question. PS : I have changed variable name from userId to studentId. - user2455158

3 Answers

1
votes

Platform calls createPartControl when the view is opened by activePage.showView(viewIdToOpen). So don't populate your fields on createPartControl. Do it when setStudentId is called.

0
votes

I also encountered this problem. Found a way around it by repacking the specific view component that needs to be updated. Here is a proof of concept that sets a string:

Setter interface:

public interface ViewSetter {    
    void setMessage(String message); 
}

View that gets initialized:

//view that implements ViewSetter  

@Override
public void createPartControl(Composite parent) {       
    label = new Label(parent, SWT.NONE); //label is a field
}

@Override
public void setMessage(final String message) {
    Display.getDefault().syncExec(new Runnable() {  
        @Override
        public void run() {
            label.setText(message);
            label.pack(true);
        }
    });
}

Code that creates and initializes the view:

IViewPart view = page.showView(viewID);
ViewSetter viewSetter = (ViewSetter)view;
viewSetter.setMessage("Hello World");