Databind and check TableViewer?

Question

I use a structure org.eclipse.core.databindingto bind some fields Textin a SWT application. I add an update strategy to check the data and set the value on the model only when the user clicks the save button:

    UpdateValueStrategy toModel = new UpdateValueStrategy(UpdateValueStrategy.POLICY_CONVERT);
    if (validator != null) {
        toModel.setAfterGetValidator(validator);
    }

    UpdateValueStrategy fromModel = new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE);

    binding = bindingContext.bindValue(SWTObservables.observeText(this, SWT.Modify),
                    BeansObservables.observeValue(pVO, propertyName), toModel, fromModel);

This piece of code works very well.

But how can I do the same on TableViewer?

I want it to work so that when I add something to IHM, the model remains unchanged until I call getBindingContext().updateModels();

Answer 1

JFace Databinding Framework TableViewer. , SWT, TableViewer, ListViewer TreeViewer. :

• ()
• ()
• set sorter ()

viewer.setInput(data), .

:

TableViewer tableViewer = new TableViewer(parent); 

Table table = tableViewer.getTable(); 
table.setHeaderVisible(true);      
table.setLinesVisible(true);`

for (int i = 0; i < COLUMN_NAMES.length; i++) {
    TableColumn tableColumn = new TableColumn(table, SWT.LEFT);
    tableColumn.setText(COLUMN_NAMES[i]);
    tableColumn.setWidth(COLUMN_WIDTHS[i]);
}

tableViewer.setContentProvider(new ModelContentProvider());
tableViewer.setLabelProvider(new ModelLabelProvider());
tableViewer.setInput(models);

:

class ModelContentProvider implements IStructuredContentProvider {

    @SuppressWarnings("unchecked")
    @Override
    public Object[] getElements(Object inputElement) {
        // The inputElement comes from view.setInput()
        if (inputElement instanceof List) {
            List models = (List) inputElement;
            return models.toArray();
        }
        return new Object[0];
    }

/* ... other methods */

}

TableItem TableItem(item.getData()).

, , LabelProvider, TableItem:

class ModelLabelProvider extends LabelProvider implements
        ITableLabelProvider {

    @Override
    public Image getColumnImage(Object element, int columnIndex) {
        // no image to show
        return null;
    }

    @Override
    public String getColumnText(Object element, int columnIndex) {
        // each element comes from the ContentProvider.getElements(Object)
        if (!(element instanceof Model)) {
            return "";
        }
        Model model = (Model) element;
        switch (columnIndex) {
        case 0:
            return model.getFoo();
        case 1:
            return model.getBar();
        default:
            break;
        }
        return "";
    }
}

. , CellEditor . CellEditor, , TableViewer:

tableViewer.setColumnProperties(COLUMNS_PROPERTIES);
tableViewer.setCellEditors(new CellEditor[] {
        new TextCellEditor(table), new TextCellEditor(table) });
tableViewer.setCellModifier(new ModelCellModifier(tableViewer));

CellModifier:

class ModelCellModifier implements ICellModifier {
    TableViewer viewer;

    public ModelCellModifier(TableViewer viewer) {
        this.viewer = viewer;
    }

    @Override
    public boolean canModify(Object element, String property) {
        // property is defined by viewer.setColumnProperties()
        // allow the FOO column can be modified.
        return "foo_prop".equals(property);
    }

    @Override
    public Object getValue(Object element, String property) {
        if ("foo_prop".equals(property)) {
            return ((Model) element).getFoo();
        }
        if ("bar_prop".equals(property)) {
            return ((Model) element).getBar();
        }
        return "";
    }

    @Override
    public void modify(Object element, String property, Object value) {
        if ("foo_prop".equals(property)) {
            TableItem item = (TableItem) element;
            ((Model) item.getData()).setFoo("" + value);

            // refresh the viewer to show the changes to our user.
            viewer.refresh();
        }
    }
}

, , .

Answer 2

ViewerSupport:

TableViewer tableViewer = ...
IObservableList tableElements = ...
IValueProperty[] columnProperties = ...
ViewerSupport.bind(tableViewer, tableElements, columnProperties);

Answer 3

i consistent with qualidafial.

Snippet017TableViewerWithDerivedColumnsof fragments jface.databindingis a complete example of this.