Teams Winter 2011/team1/RCP/Create RPC Application

2. Show Data in Application

2.1 Columns data in a JFace table can be hold in ModelProvider and it is defined via instances of TableViewerColumn object:

viewer.setInput(ModelProvider.INSTANCE.getStudents());

and

TableViewerColumn col = createTableViewerColumn(titles[0], bounds[0], 0);

2.2 Add the following lines to StudentsView.java class:
Private variable:
private TableViewer viewer;
Change the createColumns()method:


   String[] titles = { "Id", "First name", "Last name", "Program" };
   int[] bounds = { 100, 100, 100, 100 };
   // First column is for the student id
   TableViewerColumn col = createTableViewerColumn(titles[0], bounds[0], 0);
   col.setLabelProvider(new ColumnLabelProvider() {
      @Override
      public String getText(Object element) {
        Student s = (Student) element;
        return s.getId();
      }
    });
 

Add the same functionality for other three columns 2.3 Run your application:

3. Add Edit Cell Data Option

3.1 To make the column editable you need to define an object of type <code>EditingSupport/<code> on your TableColumnViewer. 3.2 Create new class for each column that extends <code>EditingSupport class:

   package cs.ecl.rcp.simplercp.edit;

   import org.eclipse.jface.viewers.CellEditor;
   import org.eclipse.jface.viewers.EditingSupport;
   import org.eclipse.jface.viewers.TableViewer;
   import org.eclipse.jface.viewers.TextCellEditor;
  
   import cs.ecl.rcp.simplercp.model.Student;

   public class IdEditingSupport extends EditingSupport {
private final TableViewer viewer;

	public IdEditingSupport(TableViewer viewer) {
		super(viewer);
		this.viewer = viewer;
	}

	@Override
	protected CellEditor getCellEditor(Object element) {
		return new TextCellEditor(viewer.getTable());
	}

	@Override
	protected boolean canEdit(Object element) {
		return true;
	}

	@Override
	protected Object getValue(Object element) {
		return ((Student) element).getId();
	}

	@Override
	protected void setValue(Object element, Object value) {
		((Student) element).setId(String.valueOf(value));
		viewer.refresh();
	}
}

3.3 Assign EditorSupport objects to your TableColumnViewers in your StudentView class.
Add the following line at the end of the LabelProvider is set:

col.setEditingSupport(new IdEditingSupport(viewer));

3.4 Run your application. You should now be able to modify the content of the table:

4. Add Sorting Option

4.1 Create a new Class StudentViewerComparator.java put it in package sorter:

   package cs.ecl.rcp.simplercp.sorter;

   import org.eclipse.jface.viewers.Viewer;
   import org.eclipse.jface.viewers.ViewerComparator;

   import cs.ecl.rcp.simplercp.model.*;

   public class StudentViewerComparator extends ViewerComparator {
      private int propertyIndex;
      private static final int DESCENDING = 1;
      private int direction = DESCENDING;

      public StudentViewerComparator() {
        this.propertyIndex = 0;
        direction = DESCENDING;
      }

      public void setColumn(int column) {
        if (column == this.propertyIndex) {
            // Same column as last sort; toggle the direction
            direction = 1 - direction;
        } else {
            // New column; do an ascending sort
            this.propertyIndex = column;
            direction = DESCENDING;
        }
      }

      @Override
      public int compare(Viewer viewer, Object e1, Object e2) {
        Student s1 = (Student) e1;
        Student s2 = (Student) e2;
        int rc = 0;
        switch (propertyIndex) {
        case 0:
            rc = s1.getId().compareTo(s2.getId());
            break;            
        case 1:
            rc = s1.getFirstName().compareTo(s2.getFirstName());
            break;
        case 2:
            rc = s1.getLastName().compareTo(s2.getLastName());
            break;
        case 3:
            rc = s1.getProgram().compareTo(s2.getProgram());
            break;        
        default:
            rc = 0;
        }
        // If descending order, flip the direction
        if (direction == DESCENDING) {
            rc = -rc;
        }
        return rc;
     }
 }
 

4.2 Add new private variable to StudentsView class:
private StudentViewerComparator comparator;
4.3 Add the following lines to the end of createPartControl() method:

  comparator = new StudentViewerComparator();
  viewer.setComparator(comparator);
 

4.4 Add SelectionListener the to the createTableViewerColumn() method:

column.addSelectionListener(getSelectionAdapter(column, colNumber));

4.5 Add new method:

   private SelectionAdapter getSelectionAdapter(final TableColumn column, 

final int index) {

		SelectionAdapter selectionAdapter = new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				comparator.setColumn(index);
				int dir = viewer.getTable().getSortDirection();
				if (viewer.getTable().getSortColumn() == column) {
					dir = dir == SWT.UP ? SWT.DOWN : SWT.UP;
				} else {

					dir = SWT.DOWN;
				}
				viewer.getTable().setSortDirection(dir);
				viewer.getTable().setSortColumn(column);
				viewer.refresh();
			}
		};
		return selectionAdapter;
	}