how can i identify whcih instance of the view is currently active in RCP

Question

Hi, sorry for posting the same problem again, but the previous one is not in good format. I dont know why.

I am creating a RCP application. I need to open multiple instances of the same view but with different data. I did it by setting secondary id for different instances of the same view. Specifically, my problem is as follows: Please take a look,

i have a graph view called "Views.GraphView". I opened different instances of it from a command called "openGraphView" to show different graphs. the command is as follows:

page.showView("Views.GraphView", Integer.toString(instanceNum++), IWorkbenchPage.VIEW_ACTIVATE);

Now, I have a command called "TreeLayout" on this "Views.GraphView" toolbar, which suppose to change the layout of the graph and it will operate on each instace of the view. But for this, i think, i need to identify which instance of the view is active. the "TreeLayout" command looks something like this:

IViewPart findView = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage(). findView( "Views.GraphView"); //i think in the findView i need to give the id of the view [but how can i put the secondary id!!]

GraphView view = (GraphView) findView; view.changeLayout(); //i wrote this method in the graph view to change the layout

//i just tried to print the secondary id, but it did not print anyting System.out.println("From treelayout command:- " + view.getViewSite().getSecondaryId());

So how can i identify whcih instance of the view is currently active and to operate on it? Please, provide some solution.

Thanks,

-Syeed

Answer 1

You can use IWorkBenchPage.findViewReference(String viewId, String viewId) , if it returns null, the view with viewId and viewId is not present in the current perspective.

If you have a ViewReference you can use ViewReference.getView(boolean restore) to get the view

so in your handler you get something like:

final IWorkbenchPage page = HandlerUtil.getActiveWorkbenchWindow(
                    event).getActivePage();
final int instanceNum = 8;//the number of instances that are created
for (int index = 0; index < instanceNum; index++) {
    final IViewReference viewReference = page.findViewReference(
                        "Views.GraphView", Integer.toString(index));
    if (viewReference != null) {
        final IViewPart view = viewReference.getView(true);
        if (view instanceof GraphView) {
            final GraphView graphView = (GraphView) view;
            graphView.changeLayout();
        }
    }
}