GWT CellTable-Need to have two buttons in last single cell of each row

Question

I am using CellTable to add columns to it. It works fine when I add rows and single data on each cell.

It has header like Name ,Age, Address with rows below it which

Answer 1

There are two ways to achieve that:

1. Subclass AbstractCell and implement the render method to create two buttons and handle its events (see here for more details).
2. Use a CompositeCell to add two ActionCells

Second approach is easier and cleaner. Here is the code for that:

public void onModuleLoad() {
    CellTable<Person> table = new CellTable<Person>();

    List<HasCell<Person, ?>> cells = new LinkedList<HasCell<Person, ?>>();
    cells.add(new ActionHasCell("Edit", new Delegate<Person>() {

        @Override
        public void execute(Person object) {
           // EDIT CODE
        }
    }));
    cells.add(new ActionHasCell("Delete", new Delegate<Person>() {

        @Override
        public void execute(Person object) {
            // DELETE CODE
        }
    }));

    CompositeCell<Person> cell = new CompositeCell<Person>(cells);
    table.addColumn(new TextColumn<Person>() {

        @Override
        public String getValue(Person object) {
            return object.getName()
        }
    }, "Name");

    // ADD Cells for Age and Address

    table.addColumn(new Column<Person, Person>(cell) {

        @Override
        public Person getValue(Person object) {
            return object;
        }
    }, "Actions");


}

private class ActionHasCell implements HasCell<Person, Person> {
    private ActionCell<Person> cell;

    public ActionHasCell(String text, Delegate<Person> delegate) {
        cell = new ActionCell<Person>(text, delegate);
    }

    @Override
    public Cell<Person> getCell() {
        return cell;
    }

    @Override
    public FieldUpdater<Person, Person> getFieldUpdater() {
        return null;
    }

    @Override
    public Person getValue(Person object) {
        return object;
    }
}

Answer 2

The solution above is perfect!THX. In addition: If you liked to design the buttons in the ActionCell, then you could do this -> In the constructon of the class you can build a html input and in "class" attribute, you can add a css style, which will be used.:

public ActionHasCell(String text, Delegate<Person> delegate) {
        cell = new ActionCell<Person>(text, delegate) {

        public void render(Context context, Person person, SafeHtmlBuilder sb)
        {
            SafeHtml html = SafeHtmlUtils.fromTrustedString("<input type=\"button\" value=\"anynameyouwant\" class=\"cssstylename\" />");
            sb.append(html);
        }

    };
}

This time you don't need the String, but you can pass parameters and use them to build the button.