Question

In MVP pattern the widget (the view) exposes its widgets in form like this:

@Override    
public HasClickHandlers getAddIssueClickHandlers() {
            return addIssueButton;
        }

and like:

@Override
public HasText getTaskName() {
    return taskName; // taskName is a Label
}

To allow the presenter to modify the view or get the values from a widget. However, its uncertain how to get a table widget, like FlexTable or CellTable in order for the presenter to modify the table. Any ideas is much appreciated. Thanks.

Answer 1

Not all GWT widgets were designed with these interfaces (i.e. HasclickHandlers, HasText, IsWidget, etc) in mind.
In recent GWT versions the basic widgets were changed so that they implement these interfaces in order to make the views which use them testable in unit tests. So I am not sure if the FlexTable implements these interfaces but in case of CellTable you can use the HasData interface.

Here you can find the interfaces that are implemented by the CellTable: Javadoc

I personally would expose the CellTable via the HasData interface, which can be used to set and retrieve the selectionModel (for selecting rows in the CellTable).
For modifying or updating the data that is displayed in the CellTable, I would use a ListDataProvider and store it in the Presenter.

@Override    
public HasData getCellTableDisplay() {
            return cellTable;
}

and in the constructor of the presenter
you can create a ListDataProvider and use the addDataDisplay function to add the CellTable:

final ListDataProvider<String> dataProvider = new ListDataProvider<String>();
dataProvider.addDataDisplay(getView().getCellTableDisplay);