2521: Explore the possibility to port the StatMan interface onto Dataminer

https://support.d4science.org/issues/2521

Fixed Layout on Fields Parameters

git-svn-id: https://svn.d4science.research-infrastructures.eu/gcube/trunk/portlets/user/data-miner-manager@127004 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portlets/user/dataminermanager/client/events/TabularFldChangeEvent.java

@@ -0,0 +1,66 @@
+package org.gcube.portlets.user.dataminermanager.client.events;
+
+import org.gcube.portlets.user.dataminermanager.shared.data.TableItemSimple;
+
+import com.google.gwt.event.shared.EventHandler;
+import com.google.gwt.event.shared.GwtEvent;
+import com.google.gwt.event.shared.HandlerRegistration;
+import com.google.gwt.event.shared.HasHandlers;
+
+/**
+ * Start Computation Event
+ * 
+ * 
+ * @author "Giancarlo Panichi" <a
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
+ *
+ */
+public class TabularFldChangeEvent extends
+		GwtEvent<TabularFldChangeEvent.TabularFldChangeEventHandler> {
+
+	public static Type<TabularFldChangeEventHandler> TYPE = new Type<TabularFldChangeEventHandler>();
+	private TableItemSimple tableItemSimple;
+
+	public interface TabularFldChangeEventHandler extends EventHandler {
+		void onChange(TabularFldChangeEvent event);
+	}
+
+	public interface HasTabularFldChangeEventHandler extends HasHandlers {
+		public HandlerRegistration addTabularFldChangeEventHandler(
+				TabularFldChangeEventHandler handler);
+	}
+
+	public TabularFldChangeEvent(TableItemSimple tableItemSimple) {
+		this.tableItemSimple = tableItemSimple;
+
+	}
+
+	@Override
+	protected void dispatch(TabularFldChangeEventHandler handler) {
+		handler.onChange(this);
+	}
+
+	@Override
+	public Type<TabularFldChangeEventHandler> getAssociatedType() {
+		return TYPE;
+	}
+
+	public static Type<TabularFldChangeEventHandler> getType() {
+		return TYPE;
+	}
+
+	public static void fire(HasHandlers source, TabularFldChangeEvent event) {
+		source.fireEvent(event);
+	}
+
+	public TableItemSimple getTableItemSimple() {
+		return tableItemSimple;
+	}
+
+	@Override
+	public String toString() {
+		return "TabularFldChangeEvent [tableItemSimple=" + tableItemSimple
+				+ "]";
+	}
+
+}

src/main/java/org/gcube/portlets/user/dataminermanager/client/experimentArea/ComputationPanel.java

@@ -2,11 +2,9 @@ package org.gcube.portlets.user.dataminermanager.client.experimentArea;
 
 import org.gcube.portlets.user.dataminermanager.client.DataMinerManager;
 import org.gcube.portlets.user.dataminermanager.client.bean.Operator;
-import org.gcube.portlets.user.dataminermanager.client.events.ComponentRefreshLayoutEvent;
 import org.gcube.portlets.user.dataminermanager.client.events.StartComputationEvent;
-import org.gcube.portlets.user.dataminermanager.client.events.ComponentRefreshLayoutEvent.ComponentRefreshLayoutEventHandler;
-import org.gcube.portlets.user.dataminermanager.client.events.StartComputationEvent.StartComputationEventHandler;
 import org.gcube.portlets.user.dataminermanager.client.events.StartComputationEvent.HasStartComputationEventHandler;
+import org.gcube.portlets.user.dataminermanager.client.events.StartComputationEvent.StartComputationEventHandler;
 import org.gcube.portlets.user.dataminermanager.client.experimentArea.ComputationParametersPanel.ComputationParametersPanelHandler;
 
 import com.google.gwt.event.shared.HandlerRegistration;
@@ -93,7 +91,7 @@ public class ComputationPanel extends FramedPanel implements
 		v.clear();
 		CenterLayoutContainer centerContainer = new CenterLayoutContainer();
 		centerContainer.add(new HTML(
-				"<p align='center'>Select an operator.</p>"));
+				"<span align='center'>Select an operator.</span>"));
 		v.add(centerContainer, new VerticalLayoutData(1, 1, new Margins(0)));
 		forceLayout();
 
@@ -111,6 +109,7 @@ public class ComputationPanel extends FramedPanel implements
 		v.add(computationParametersPanel, new VerticalLayoutData(1, -1,
 				new Margins(0,5,5,5)));
 		removeAllButton.setEnabled(true);
+		
 		forceLayout();
 	}
 

src/main/java/org/gcube/portlets/user/dataminermanager/client/experimentArea/ComputationParametersPanel.java

@@ -13,10 +13,9 @@ import org.gcube.portlets.user.dataminermanager.client.bean.Operator;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ColumnListParameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ColumnParameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
-import org.gcube.portlets.user.dataminermanager.client.events.ComponentRefreshLayoutEvent;
-import org.gcube.portlets.user.dataminermanager.client.events.ComponentRefreshLayoutEvent.ComponentRefreshLayoutEventHandler;
-import org.gcube.portlets.user.dataminermanager.client.events.ComponentRefreshLayoutEvent.HasComponentRefreshLayoutEventHandler;
 import org.gcube.portlets.user.dataminermanager.client.parametersfield.AbstractFld;
+import org.gcube.portlets.user.dataminermanager.client.parametersfield.ColumnFld;
+import org.gcube.portlets.user.dataminermanager.client.parametersfield.ColumnListFld;
 import org.gcube.portlets.user.dataminermanager.client.parametersfield.OperatorFieldWidget;
 import org.gcube.portlets.user.dataminermanager.client.parametersfield.TabularFld;
 import org.gcube.portlets.user.dataminermanager.client.util.UtilsGXT3;
@@ -24,12 +23,10 @@ import org.gcube.portlets.user.dataminermanager.client.util.UtilsGXT3;
 import com.allen_sauer.gwt.log.client.Log;
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.dom.client.Style.Unit;
-import com.google.gwt.event.shared.HandlerRegistration;
 import com.google.gwt.i18n.client.DateTimeFormat;
 import com.google.gwt.i18n.client.DateTimeFormat.PredefinedFormat;
 import com.google.gwt.resources.client.ImageResource;
 import com.google.gwt.user.client.rpc.AsyncCallback;
-import com.google.gwt.user.client.ui.HTML;
 import com.google.gwt.user.client.ui.Image;
 import com.sencha.gxt.core.client.util.Margins;
 import com.sencha.gxt.widget.core.client.button.TextButton;
@@ -73,11 +70,7 @@ public class ComputationParametersPanel extends SimpleContainer {
 	private TextField titleField;
 	private String defaultComputationTitle;
 
-	/*
+	private TextButton submit;
-	 * public ComputationParametersPanel(DataMinerPortletServiceAsync service,
-	 * Operator operator, ComputationParametersPanelHandler handler) {
-	 * this(operator); this.setHandler(handler); }
-	 */
 
 	public ComputationParametersPanel(Operator operator) {
 		super();
@@ -92,7 +85,6 @@ public class ComputationParametersPanel extends SimpleContainer {
 		}
 	}
 
-	
 	private void init() {
 		addStyleName("workflow");
 	}
@@ -107,19 +99,23 @@ public class ComputationParametersPanel extends SimpleContainer {
 		img.setStylePrimaryName("workflow-icon");
 		v.add(img, new VerticalLayoutData(-1, -1, new Margins(-10, 0, 0, 5)));
 
-		HtmlLayoutContainer title = new HtmlLayoutContainer(operator.getName());
+		HtmlLayoutContainer title = new HtmlLayoutContainer("<span>"
+				+ operator.getName() + "</span>");
 		title.addStyleName("workflow-title");
 		v.add(title, new VerticalLayoutData(-1, -1, new Margins(15, 0, 0, -25)));
 
 		String descr = operator.getDescription();
 		descr = (descr == null || descr.contentEquals("")) ? "no-description"
 				: operator.getDescription();
-		HtmlLayoutContainer description = new HtmlLayoutContainer(descr);
+		HtmlLayoutContainer description = new HtmlLayoutContainer("<span>"
+				+ descr + "</span>");
 		description.addStyleName("workflow-description");
-		v.add(description, new VerticalLayoutData(-1, -1, new Margins(0,0,0,5)));
+		v.add(description, new VerticalLayoutData(-1, -1, new Margins(0, 5, 0,
+				10)));
 
 		addTitleField();
 		
+	
 		parametersPanel = new FormPanel() {
 			@Override
 			public boolean isValid(boolean preventMark) {
@@ -136,21 +132,55 @@ public class ComputationParametersPanel extends SimpleContainer {
 			}
 
 		};
+		//parametersPanel = new FramedPanel();
+		parametersPanel.setDeferHeight(false);
 		parametersPanel.setBorders(false);
 
 		// parametersPanel.getElement().getStyle().setMargin(20, px);
 		parametersFieldSet = new FieldSet();
 		parametersFieldSet.setHeadingText("Parameters");
+		
 		vParameters = new VerticalLayoutContainer();
+		
+		Image imgLoading = new Image(PRELOAD_IMAGE);
+		vParameters.add(imgLoading, new VerticalLayoutData(1, -1, new Margins(5)));
+		
 		parametersFieldSet.add(vParameters, new MarginData(0));
 		parametersFieldSet.setCollapsible(false);
-		parametersPanel.add(parametersFieldSet, new MarginData(new Margins(5,5, 5, 5)));
+		parametersPanel.add(parametersFieldSet, new MarginData(new Margins(5)));
-
 		v.add(parametersPanel, new VerticalLayoutData(1, -1, new Margins()));
 				
+		submit = new TextButton("Start Computation");
+		submit.setToolTip(START_BUTTON_TOOLTIP);
+		submit.setIcon(DataMinerManager.resources.startComputation());
+		
+		
+		submit.getElement().getStyle().setMarginLeft(20, Unit.PX);
+		submit.getElement().getStyle().setMarginBottom(20, Unit.PX);
+
+		submit.addSelectHandler(new SelectHandler() {
+
+			@Override
+			public void onSelect(SelectEvent event) {
+				if (handler != null && parametersPanel.isValid()) {
+					String value = titleField.getValue();
+					String title = (value == null || value.contentEquals("")) ? defaultComputationTitle
+							: value;
+					handler.startComputation(title, title); // TODO insert
+															// description
+				}
+
+			}
+		});
+		
+		v.add(submit);
+		//, new VerticalLayoutData(-1, -1, new Margins(0, 0, 20, 20)));
+		submit.setVisible(false);
+		
+		forceLayout();
+
 		loadOperatorParameters();
 
-		fireEvent(new ComponentRefreshLayoutEvent());
 	}
 
 	/**
@@ -162,7 +192,7 @@ public class ComputationParametersPanel extends SimpleContainer {
 		titleField.setValue(defaultComputationTitle);
 		FieldLabel titleLabel = new FieldLabel(titleField, "Computation Title");
 		v.add(titleLabel, new VerticalLayoutData(-1, -1,
-				new Margins(0,0,0,5)));
+				new Margins(5, 0, 0, 5)));
 	}
 
 	/**
@@ -185,10 +215,8 @@ public class ComputationParametersPanel extends SimpleContainer {
 								"Impossible to retrieve parameters.");
 					}
 				});
-		Image img = new Image(PRELOAD_IMAGE);
+		
-		img.setStyleName("workflow-parameters-preload");
+
-		vParameters.add(img, new VerticalLayoutData(-1, -1, new Margins()));
-		forceLayout();
 	}
 
 	/**
@@ -220,7 +248,20 @@ public class ComputationParametersPanel extends SimpleContainer {
 						if (tabularField != null) {
 							AbstractFld field = fieldWidgetsMap
 									.get(p.getName()).getField();
-							tabularField.addChangeListener(field);
+							if (field instanceof ColumnFld) {
+								ColumnFld columnField = (ColumnFld) field;
+								tabularField
+										.addTabularFldChangeEventHandler(columnField);
+							} else {
+								if (field instanceof ColumnListFld) {
+									ColumnListFld columnListField = (ColumnListFld) field;
+									tabularField
+											.addTabularFldChangeEventHandler(columnListField);
+								} else {
+
+								}
+							}
+
 						}
 					} catch (Exception e) {
 						e.printStackTrace();
@@ -234,31 +275,7 @@ public class ComputationParametersPanel extends SimpleContainer {
 				}
 			}
 
-			final TextButton submit = new TextButton("Start Computation");
+			submit.setVisible(true);
-			submit.setToolTip(START_BUTTON_TOOLTIP);
-			submit.setIcon(DataMinerManager.resources.startComputation());
-			submit.getElement().getStyle().setMarginLeft(20, Unit.PX);
-			submit.getElement().getStyle().setMarginBottom(20, Unit.PX);
-
-			submit.addSelectHandler(new SelectHandler() {
-
-				@Override
-				public void onSelect(SelectEvent event) {
-					if (handler != null && parametersPanel.isValid()) {
-						String value = titleField.getValue();
-						String title = (value == null || value
-								.contentEquals("")) ? defaultComputationTitle
-								: value;
-						handler.startComputation(title, title); // TODO insert
-																// description
-					}
-
-				}
-			});
-
-			//new VerticalLayoutData(-1, -1, new Margins(0, 0, 20,20))
-			v.add(submit);
-			
 			forceLayout();
 		} catch (Throwable e) {
 			Log.error("Error in show form:" + e.getLocalizedMessage());

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/AbstractFld.java

@@ -19,6 +19,7 @@ public abstract class AbstractFld {
 	public abstract String getValue();	
 	public abstract Widget getWidget();
 	
+	
 	/**
 	 * 
 	 */
@@ -48,9 +49,6 @@ public abstract class AbstractFld {
 		// (for string, int, float, double and boolean) the  built-in validation is enough
 		return true;
 	}
-	/**
+	
-	 * @param tableItem
+	
-	 */
-	public void fireEvent(Object message) {		
-	}	
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/BooleanFld.java

@@ -7,14 +7,23 @@ import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ObjectPar
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
 
 import com.google.gwt.user.client.ui.Widget;
+import com.sencha.gxt.core.client.util.Margins;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
 import com.sencha.gxt.widget.core.client.form.CheckBox;
 
 /**
- * @author ceras
+ * 
+ * @author Giancarlo Panichi email: <a
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
  *
  */
 public class BooleanFld extends AbstractFld {
 
+	private SimpleContainer fieldContainer;
 	private CheckBox checkBox = new CheckBox();
 
 	/**
@@ -22,14 +31,38 @@ public class BooleanFld extends AbstractFld {
 	 */
 	public BooleanFld(Parameter parameter) {
 		super(parameter);
+		fieldContainer = new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
 
 		ObjectParameter p = (ObjectParameter) parameter;
-		checkBox.setValue(!p.getDefaultValue().toUpperCase().equals("FALSE"));
+
-		if (p.getDescription()!=null)
+		if (p.getDefaultValue() != null)
-			checkBox.setTitle(p.getDescription());
+			checkBox.setValue(!p.getDefaultValue().toUpperCase()
+					.equals("FALSE"));
+		else checkBox.setValue(false);
 		checkBox.setBoxLabel(p.getName());
+
+		HtmlLayoutContainer descr;
+
+		if (p.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			checkBox.setToolTip(p.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ p.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
 		}
 
+		horiz.add(checkBox, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
+
+	}
 
 	@Override
 	public String getValue() {
@@ -38,7 +71,7 @@ public class BooleanFld extends AbstractFld {
 
 	@Override
 	public Widget getWidget() {
-		return checkBox;
+		return fieldContainer;
 	}
 
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/ColumnFld.java

@@ -7,16 +7,25 @@ import java.util.ArrayList;
 
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ColumnParameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent.TabularFldChangeEventHandler;
 import org.gcube.portlets.user.dataminermanager.client.properties.ColumnItemPropertiesCombo;
 import org.gcube.portlets.user.dataminermanager.shared.data.ColumnItem;
 import org.gcube.portlets.user.dataminermanager.shared.data.TableItemSimple;
 
 import com.google.gwt.core.client.GWT;
-import com.google.gwt.user.client.ui.HTML;
 import com.google.gwt.user.client.ui.Widget;
 import com.sencha.gxt.cell.core.client.form.ComboBoxCell.TriggerAction;
+import com.sencha.gxt.core.client.util.Format;
+import com.sencha.gxt.core.client.util.Margins;
 import com.sencha.gxt.data.shared.ListStore;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.form.ComboBox;
 
 /**
@@ -25,9 +34,10 @@ import com.sencha.gxt.widget.core.client.form.ComboBox;
  *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
  *
  */
-public class ColumnFld extends AbstractFld {
+public class ColumnFld extends AbstractFld implements
+		TabularFldChangeEventHandler {
 
-	private VerticalLayoutContainer vp;
+	//private VerticalLayoutContainer vp;
 
 	private String defaultColumn;
 
@@ -35,16 +45,27 @@ public class ColumnFld extends AbstractFld {
 	private ListStore<ColumnItem> store;
 	private String referredTabularParameterName;
 
+	private SimpleContainer fieldContainer;
+
+	private SimpleContainer vContainer;
+
 	/**
 	 * @param parameter
 	 */
 	public ColumnFld(Parameter parameter) {
 		super(parameter);
-		vp = new VerticalLayoutContainer();
+		
 
 		ColumnParameter p = (ColumnParameter) parameter;
-		this.referredTabularParameterName = p.getReferredTabularParameterName();
+		
-		this.defaultColumn = p.getDefaultColumn();
+		referredTabularParameterName = p.getReferredTabularParameterName();
+		defaultColumn = p.getDefaultColumn();
+
+		fieldContainer = new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
+		
 		
 		ColumnItemPropertiesCombo props = GWT
 				.create(ColumnItemPropertiesCombo.class);
@@ -56,18 +77,62 @@ public class ColumnFld extends AbstractFld {
 		comboBox.setForceSelection(true);
 		comboBox.setEditable(false);
 		comboBox.setTriggerAction(TriggerAction.ALL);
-		if (p.getDescription() != null)
-			comboBox.setTitle(p.getDescription());
 		comboBox.setEnabled(false);
-		showNoSelectionField();
+
+		HtmlLayoutContainer descr;
+
+		if (p.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			comboBox.setToolTip(p.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ p.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
 		}
 
+		vContainer=new SimpleContainer();
+		showNoSelectionField();
+		horiz.add(vContainer, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
+		fieldContainer.forceLayout();
+		
+		
+	}
+
+	private void showNoSelectionField() {
+		vContainer.clear();
+		VerticalLayoutContainer vField = new VerticalLayoutContainer();
+		HtmlLayoutContainer typeDescription= new HtmlLayoutContainer(
+				"<div class='workflow-parameters-description'><p>Select table from parameter "
+						+ Format.ellipse(referredTabularParameterName,30) + "</p></div>");
+		typeDescription.setStylePrimaryName("workflow-parameters-description");
+		vField.add(comboBox, new VerticalLayoutData(1,-1,new Margins(0)));
+		vField.add(typeDescription, new VerticalLayoutData(-1,-1,new Margins(0)));
+		vContainer.add(vField);
+	}
+	
+	private void showFieldWithSelection(TableItemSimple tableItem) {
+		vContainer.clear();
+		VerticalLayoutContainer vField = new VerticalLayoutContainer();
+		HtmlLayoutContainer typeDescription= new HtmlLayoutContainer(
+				"<div class='workflow-parameters-description'><p>Columns of Table "
+						+ Format.ellipse(tableItem.getName(),30) + "</p></div>");
+		typeDescription.setStylePrimaryName("workflow-parameters-description");
+		vField.add(comboBox, new VerticalLayoutData(1,-1,new Margins(0)));
+		vField.add(typeDescription, new VerticalLayoutData(-1,-1,new Margins(0)));
+		vContainer.add(vField);
+	}
+	
+
 	/**
 	 * 
-	 */
+	
 	private void showNoSelectionField() {
 		vp.clear();
-		;
 		vp.add(comboBox);
 		vp.add(new HTML(
 				"<div class='workflow-parameters-description'>Select table from parameter "
@@ -75,9 +140,6 @@ public class ColumnFld extends AbstractFld {
 		vp.forceLayout();
 	}
 
-	/**
-	 * 
-	 */
 	private void showFieldWithSelection(TableItemSimple tableItem) {
 		vp.clear();
 		vp.add(comboBox);
@@ -85,7 +147,7 @@ public class ColumnFld extends AbstractFld {
 				"<div class='workflow-parameters-description'>Columns of Table "
 						+ tableItem.getName() + "</div>"));
 		vp.forceLayout();
-	}
+	} */
 
 	/**
 	 * 
@@ -101,23 +163,22 @@ public class ColumnFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return vp;
+		return fieldContainer;
 	}
 
-	
 	@Override
-	public void fireEvent(Object message) {
+	public void onChange(TabularFldChangeEvent event) {
-		if (message == null) {
+		TableItemSimple tableItemSimple = event.getTableItemSimple();
+		if (tableItemSimple == null) {
 			store.clear();
 			store.commitChanges();
 			comboBox.clear();
 			comboBox.setEnabled(false);
 			showNoSelectionField();
 		} else {
-			TableItemSimple tableItem = (TableItemSimple) message;
 			store.clear();
 			store.commitChanges();
-			ArrayList<ColumnItem> columns = tableItem.getColumns();
+			ArrayList<ColumnItem> columns = tableItemSimple.getColumns();
 			if (columns != null) {
 				store.addAll(columns);
 				for (ColumnItem columnItem : columns) {
@@ -130,8 +191,9 @@ public class ColumnFld extends AbstractFld {
 			}
 			comboBox.clear();
 			comboBox.setEnabled(true);
-			showFieldWithSelection(tableItem);
+			showFieldWithSelection(tableItemSimple);
 		}
+		fieldContainer.forceLayout();
 	}
 
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/ColumnListFld.java

@@ -8,6 +8,8 @@ import java.util.List;
 
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ColumnListParameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent.TabularFldChangeEventHandler;
 import org.gcube.portlets.user.dataminermanager.client.properties.ColumnItemProperties;
 import org.gcube.portlets.user.dataminermanager.shared.data.ColumnItem;
 import org.gcube.portlets.user.dataminermanager.shared.data.TableItemSimple;
@@ -30,8 +32,8 @@ import com.sencha.gxt.widget.core.client.grid.Grid;
  *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
  *
  */
-public class ColumnListFld extends AbstractFld {
+public class ColumnListFld extends AbstractFld implements
-
+		TabularFldChangeEventHandler {
 
 	private VerticalLayoutContainer vp;
 	private ColumnListParameter columnListParameter;
@@ -110,7 +112,6 @@ public class ColumnListFld extends AbstractFld {
 		vp.forceLayout();
 	}
 
-	
 	/**
 	 * 
 	 */
@@ -136,26 +137,7 @@ public class ColumnListFld extends AbstractFld {
 		return vp;
 	}
 
-	/**
+	
-	 * 
-	 */
-	@Override
-	public void fireEvent(Object message) {
-		if (message == null) {
-			store.clear();
-			store.commitChanges();
-			grid.disable();
-			showNoSelectionField();
-		} else {
-			TableItemSimple tableItem = (TableItemSimple) message;
-			store.clear();
-			store.commitChanges();
-			store.addAll(tableItem.getColumns());
-			store.commitChanges();
-			grid.enable();
-			showFieldWithSelection(tableItem);
-		}
-	}
 
 	/**
 	 * 
@@ -165,4 +147,23 @@ public class ColumnListFld extends AbstractFld {
 		return store.size() > 0;
 	}
 
+	@Override
+	public void onChange(TabularFldChangeEvent event) {
+		TableItemSimple tableItemSimple = event.getTableItemSimple();
+		if (tableItemSimple == null) {
+			store.clear();
+			store.commitChanges();
+			grid.disable();
+			showNoSelectionField();
+		} else {
+			store.clear();
+			store.commitChanges();
+			store.addAll(tableItemSimple.getColumns());
+			store.commitChanges();
+			grid.enable();
+			showFieldWithSelection(tableItemSimple);
+		}
+		
+	}
+
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/DoubleFld.java

@@ -4,6 +4,14 @@ import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ObjectPar
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
 
 import com.google.gwt.user.client.ui.Widget;
+import com.sencha.gxt.core.client.util.Margins;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.form.DoubleField;
 
 /**
@@ -14,6 +22,7 @@ import com.sencha.gxt.widget.core.client.form.DoubleField;
  */
 public class DoubleFld extends AbstractFld {
 	
+	private SimpleContainer fieldContainer;
 	private DoubleField numberField;
 
 	/**
@@ -21,6 +30,10 @@ public class DoubleFld extends AbstractFld {
 	 */
 	public DoubleFld(Parameter parameter) {
 		super(parameter);
+		fieldContainer=new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
 
 		ObjectParameter p = (ObjectParameter) parameter;
 
@@ -28,10 +41,37 @@ public class DoubleFld extends AbstractFld {
 
 		if (p.getDefaultValue() != null)
 			numberField.setValue(Double.parseDouble(p.getDefaultValue()));
+		else 
+			numberField.setAllowBlank(false);
 			
-		if (p.getDescription() != null)
+		HtmlLayoutContainer descr;
-			numberField.setTitle(p.getDescription());
 
+		if (p.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			numberField.setToolTip(p.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ p.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
+		}
+
+		SimpleContainer vContainer=new SimpleContainer();
+		VerticalLayoutContainer vField = new VerticalLayoutContainer();
+		HtmlLayoutContainer typeDescription = new HtmlLayoutContainer(
+				"Double Value");
+		typeDescription.setStylePrimaryName("workflow-parameters-description");
+		vField.add(numberField, new VerticalLayoutData(1,-1,new Margins(0)));
+		vField.add(typeDescription, new VerticalLayoutData(-1,-1,new Margins(0)));
+		vContainer.add(vField);
+		
+		horiz.add(vContainer, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
+		
+		fieldContainer.forceLayout();
 	}
 
 	/**
@@ -47,7 +87,7 @@ public class DoubleFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return numberField;
+		return fieldContainer;
 	}
 
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/EnumFld.java

@@ -8,17 +8,24 @@ import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter
 
 import com.google.gwt.user.client.ui.Widget;
 import com.sencha.gxt.cell.core.client.form.ComboBoxCell.TriggerAction;
+import com.sencha.gxt.core.client.util.Margins;
 import com.sencha.gxt.data.shared.StringLabelProvider;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
 import com.sencha.gxt.widget.core.client.form.SimpleComboBox;
 
 /**
  * 
- * @author Giancarlo Panichi
+ * @author Giancarlo Panichi email: <a
- * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
  *
  */
 public class EnumFld extends AbstractFld {
 
+	private SimpleContainer fieldContainer;
 	private SimpleComboBox<String> listBox;
 
 	/**
@@ -26,6 +33,10 @@ public class EnumFld extends AbstractFld {
 	 */
 	public EnumFld(Parameter parameter) {
 		super(parameter);
+		fieldContainer = new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
 
 		EnumParameter p = (EnumParameter) parameter;
 
@@ -35,11 +46,27 @@ public class EnumFld extends AbstractFld {
 		listBox.setForceSelection(true);
 		listBox.setEditable(false);
 		listBox.setTriggerAction(TriggerAction.ALL);
-		if (p.getDescription() != null)
+
-			listBox.setTitle(p.getDescription());
 		if (p.getDefaultValue() != null)
 			listBox.setValue(p.getDefaultValue());
 
+		HtmlLayoutContainer descr;
+
+		if (p.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			listBox.setToolTip(p.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ p.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
+		}
+		horiz.add(listBox, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
+
 	}
 
 	/**

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/FloatFld.java

@@ -4,6 +4,14 @@ import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ObjectPar
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
 
 import com.google.gwt.user.client.ui.Widget;
+import com.sencha.gxt.core.client.util.Margins;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.form.FloatField;
 
 /**
@@ -14,6 +22,7 @@ import com.sencha.gxt.widget.core.client.form.FloatField;
  */
 public class FloatFld extends AbstractFld {
 	
+	private SimpleContainer fieldContainer;
 	private FloatField numberField;
 
 	/**
@@ -21,16 +30,49 @@ public class FloatFld extends AbstractFld {
 	 */
 	public FloatFld(Parameter parameter) {
 		super(parameter);
+		fieldContainer=new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
 
 		ObjectParameter p = (ObjectParameter) parameter;
 		
+	
 		numberField = new FloatField();
 
 		if (p.getDefaultValue() != null)
 			numberField.setValue(Float.parseFloat(p.getDefaultValue()));
+		else 
+			numberField.setAllowBlank(false);
 			
-		if (p.getDescription() != null)
+
-			numberField.setTitle(p.getDescription());
+		HtmlLayoutContainer descr;
+
+		if (p.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			numberField.setToolTip(p.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ p.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
+		}
+
+		SimpleContainer vContainer=new SimpleContainer();
+		VerticalLayoutContainer vField = new VerticalLayoutContainer();
+		HtmlLayoutContainer typeDescription = new HtmlLayoutContainer(
+				"Float Value");
+		typeDescription.setStylePrimaryName("workflow-parameters-description");
+		vField.add(numberField, new VerticalLayoutData(1,-1,new Margins(0)));
+		vField.add(typeDescription, new VerticalLayoutData(-1,-1,new Margins(0)));
+		vContainer.add(vField);
+		
+		horiz.add(vContainer, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
+		fieldContainer.forceLayout();
 		
 	}
 
@@ -48,6 +90,6 @@ public class FloatFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return numberField;
+		return fieldContainer;
 	}
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/IntFld.java

@@ -1,22 +1,28 @@
-
 package org.gcube.portlets.user.dataminermanager.client.parametersfield;
 
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ObjectParameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
 
 import com.google.gwt.user.client.ui.Widget;
+import com.sencha.gxt.core.client.util.Margins;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.form.IntegerField;
 
-
 /**
  * 
- * @author Giancarlo Panichi
+ * @author Giancarlo Panichi email: <a
- * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
  *
  */
 public class IntFld extends AbstractFld {
 
-	
+	private SimpleContainer fieldContainer;
 	private IntegerField numberField;
 
 	/**
@@ -24,19 +30,48 @@ public class IntFld extends AbstractFld {
 	 */
 	public IntFld(Parameter parameter) {
 		super(parameter);
+		fieldContainer = new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
 
 		ObjectParameter p = (ObjectParameter) parameter;
 
-		
 		numberField = new IntegerField();
 
 		if (p.getDefaultValue() != null)
 			numberField.setValue(Integer.parseInt(p.getDefaultValue()));
-
+		else
-		if (p.getDescription() != null)
-			numberField.setTitle(p.getDescription());
 			numberField.setAllowBlank(false);
 
+		HtmlLayoutContainer descr;
+
+		if (p.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			numberField.setToolTip(p.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ p.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
+		}
+
+		SimpleContainer vContainer=new SimpleContainer();
+		VerticalLayoutContainer vField = new VerticalLayoutContainer();
+		HtmlLayoutContainer typeDescription = new HtmlLayoutContainer(
+				"Integer Value");
+		typeDescription.setStylePrimaryName("workflow-parameters-description");
+		vField.add(numberField, new VerticalLayoutData(1,-1,new Margins(0)));
+		vField.add(typeDescription, new VerticalLayoutData(-1,-1,new Margins(0)));
+		vContainer.add(vField);
+		
+		horiz.add(vContainer, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
+		fieldContainer.forceLayout();
+
 	}
 
 	/**
@@ -53,7 +88,7 @@ public class IntFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return numberField;
+		return fieldContainer;
 	}
 
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/ListStringFld.java

@@ -11,37 +11,135 @@ import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ListParam
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ObjectParameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
 
+import com.google.gwt.editor.client.Editor.Path;
 import com.google.gwt.user.client.ui.Widget;
+import com.sencha.gxt.core.client.ValueProvider;
+import com.sencha.gxt.core.client.util.Margins;
+import com.sencha.gxt.data.shared.ModelKeyProvider;
+import com.sencha.gxt.data.shared.PropertyAccess;
 import com.sencha.gxt.widget.core.client.button.TextButton;
-import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.MarginData;
 import com.sencha.gxt.widget.core.client.container.SimpleContainer;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
+import com.sencha.gxt.widget.core.client.form.TextField;
 
 /**
- * @author ceras
+ * 
+ * @author Giancarlo Panichi
+ * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
  *
  */
 public class ListStringFld extends AbstractFld {
 	
-	private List<Item> items;
+	private SimpleContainer fieldContainer;
-	private SimpleContainer simpleContainer;
+	private HBoxLayoutContainer horiz;
+	private SimpleContainer listContainer;
 	private VerticalLayoutContainer vp;
+	private List<Item> items;
 	private ListParameter listParameter;
-
 	/**
+	 * 
 	 * @param parameter
 	 */
 	public ListStringFld(Parameter parameter) {
 		super(parameter);
-		this.listParameter = (ListParameter) parameter;
+		
-		simpleContainer = new SimpleContainer();
+		listParameter = (ListParameter) parameter;	
+		
+		listContainer = new SimpleContainer();
 		vp = new VerticalLayoutContainer();
-		simpleContainer.add(vp);
 		items = new ArrayList<Item>();
 		addField(null);
+		listContainer.add(vp, new MarginData(new Margins()));
+		
+		fieldContainer = new SimpleContainer();
+		horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
+		
+		HtmlLayoutContainer descr;
+
+		if (listParameter.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			listContainer.setToolTip(listParameter.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ listParameter.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
 		}
 
+		horiz.add(listContainer, new BoxLayoutData(new Margins(0)));
+		horiz.add(descr, new BoxLayoutData(new Margins(0)));
+
+		fieldContainer.add(horiz);
+		fieldContainer.forceLayout();
+	}
+	
+	public interface ItemStringProperties extends PropertyAccess<ItemString> {
+
+		@Path("id")
+		ModelKeyProvider<ItemString> id();
+		ValueProvider<ItemString, String> label();
+
+		
+	}
+	
+	public class ItemString{
+		
+		
+	}
+	
+	/*
+	private void gridDef(){
+		 ColumnConfig<Stock, String> nameCol = new ColumnConfig<Stock, String>(props.name(), 50, "Company");
+	      ColumnConfig<Stock, String> symbolCol = new ColumnConfig<Stock, String>(props.symbol(), 75, "Symbol");
+	      ColumnConfig<Stock, Double> lastCol = new ColumnConfig<Stock, Double>(props.last(), 75, "Last");
+	      ColumnConfig<Stock, Double> changeCol = new ColumnConfig<Stock, Double>(props.change(), 75, "Change");
+	      ColumnConfig<Stock, Date> lastTransCol = new ColumnConfig<Stock, Date>(props.lastTrans(), 100, "Last Updated");
+	 
+	      final NumberFormat number = NumberFormat.getFormat("0.00");
+	      changeCol.setCell(new AbstractCell<Double>() {
+	        @Override
+	        public void render(Context context, Double value, SafeHtmlBuilder sb) {
+	          String style = "style='color: " + (value < 0 ? "red" : "green") + "'";
+	          String v = number.format(value);
+	          sb.appendHtmlConstant("<span " + style + ">" + v + "</span>");
+	        }
+	      });
+	 
+	      lastTransCol.setCell(new DateCell(DateTimeFormat.getFormat("MM/dd/yyyy")));
+	 
+	      List<ColumnConfig<Stock, ?>> columns = new ArrayList<ColumnConfig<Stock, ?>>();
+	      columns.add(nameCol);
+	      columns.add(symbolCol);
+	      columns.add(lastCol);
+	      columns.add(changeCol);
+	      columns.add(lastTransCol);
+	 
+	      ColumnModel<Stock> cm = new ColumnModel<Stock>(columns);
+	 
+	      ListStore<Stock> store = new ListStore<Stock>(props.key());
+	      store.addAll(TestData.getStocks());
+	 
+	      final Grid<Stock> grid = new Grid<Stock>(store, cm);
+	      grid.setAllowTextSelection(true);
+	      grid.getView().setAutoExpandColumn(nameCol);
+	      grid.getView().setStripeRows(true);
+	      grid.getView().setColumnLines(true);
+	      grid.setBorders(false);
+	      grid.setColumnReordering(true);
+	 
+	}
+	*/
+
 	private void addField(Item upperItem) {
 
 		ObjectParameter objPar = new ObjectParameter(listParameter.getName(),
@@ -50,7 +148,7 @@ public class ListStringFld extends AbstractFld {
 		if (upperItem == null) {
 			Item item = new Item(objPar, true);
 			items.add(item);
-			vp.add(item);
+			vp.add(item, new VerticalLayoutData(1,-1, new Margins()));
 		} else {
 			// search the position of the upper item
 			int pos = 0;
@@ -66,7 +164,6 @@ public class ListStringFld extends AbstractFld {
 			vp.insert(item, pos + 1);
 		}
 		
-		simpleContainer.forceLayout();
 	}
 
 	/**
@@ -81,7 +178,7 @@ public class ListStringFld extends AbstractFld {
 			items.get(0).hideCancelButton();
 		}
 		
-		simpleContainer.forceLayout();
+		
 
 	}
 
@@ -108,7 +205,7 @@ public class ListStringFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return simpleContainer;
+		return fieldContainer;
 	}
 
 	/**
@@ -118,74 +215,88 @@ public class ListStringFld extends AbstractFld {
 	public boolean isValid() {
 		boolean valid = false;
 		for (Item item : items)
-			if (item.getField().getValue() != null) {
+			if (item.isValid()) {
 				valid = true;
 				break;
 			}
 		return valid;
 	}
 
-	private class Item extends HorizontalLayoutContainer {
+	private class Item extends HBoxLayoutContainer {
 
-		private StringFld field;
+		private TextField field;
-		private TextButton addButton;
+		private TextButton addBtn;
-		private TextButton removeButton;
+		private TextButton removeBtn;
 
 		/**
 		 * @param objPar
 		 */
 		public Item(ObjectParameter objectParameter, boolean first) {
 			super();
-			this.field = new StringFld(objectParameter);
-			this.add(field.getWidget());
 			
-			addButton = new TextButton("");
+			field = new TextField();
+			field.setAllowBlank(false);
 			
-			addButton.setIcon(DataMinerManager.resources.add());
+			addBtn = new TextButton("");
 
-			addButton.addSelectHandler(new SelectEvent.SelectHandler() {
+			addBtn.setIcon(DataMinerManager.resources.add());
+
+			addBtn.addSelectHandler(new SelectEvent.SelectHandler() {
 
 				@Override
 				public void onSelect(SelectEvent event) {
 					addField(Item.this);
+					forceLayout();
+					vp.forceLayout();
+					fieldContainer.forceLayout();
 
 				}
 			});
 
-			removeButton = new TextButton("");
+			removeBtn = new TextButton("");
 
-			removeButton.setIcon(DataMinerManager.resources.cancel());
+			removeBtn.setIcon(DataMinerManager.resources.cancel());
 
-			removeButton.addSelectHandler(new SelectEvent.SelectHandler() {
+			removeBtn.addSelectHandler(new SelectEvent.SelectHandler() {
 
 				@Override
 				public void onSelect(SelectEvent event) {
 					removeField(Item.this);
+					forceLayout();
+					vp.forceLayout();
+					fieldContainer.forceLayout();
 
 				}
 			});
 
-			removeButton.setVisible(!first);
+			removeBtn.setVisible(!first);
 			
-			this.add(addButton);
+			setPack(BoxLayoutPack.START);
-			this.add(removeButton);
+			setEnableOverflow(false);
+			add(field, new BoxLayoutData(new Margins()));
+			add(addBtn,new BoxLayoutData(new Margins()));
+			add(removeBtn,new BoxLayoutData(new Margins()));
+		
+			forceLayout();
 		}
 
 		public void showCancelButton() {
-			removeButton.setVisible(true);
+			removeBtn.setVisible(true);
 		}
 
 		public void hideCancelButton() {
-			removeButton.setVisible(false);
+			removeBtn.setVisible(false);
 		}
 
 		public String getValue() {
-			return field.getValue();
+			return field.getCurrentValue();
 		}
 		
-		public StringFld getField() {
+		public boolean isValid(){
-			return field;
+			return field.isValid();
 		}
+
+		
 	}
 
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/StringFld.java

@@ -8,13 +8,11 @@ import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter
 
 import com.google.gwt.user.client.ui.Widget;
 import com.sencha.gxt.core.client.util.Margins;
-import com.sencha.gxt.core.client.util.Padding;
 import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
 import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
 import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
-import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
-import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer.HorizontalLayoutData;
 import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.MarginData;
 import com.sencha.gxt.widget.core.client.container.SimpleContainer;
 import com.sencha.gxt.widget.core.client.form.TextField;
 
@@ -26,8 +24,7 @@ import com.sencha.gxt.widget.core.client.form.TextField;
  */
 public class StringFld extends AbstractFld {
 
-	private SimpleContainer simpleContainer;
+	private SimpleContainer fieldContainer;
-	private HorizontalLayoutContainer horiz;
 	private TextField textField;
 
 	/**
@@ -35,10 +32,6 @@ public class StringFld extends AbstractFld {
 	 */
 	public StringFld(Parameter parameter) {
 		super(parameter);
-		simpleContainer=new SimpleContainer();
-		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
-		horiz.setPack(BoxLayoutPack.START);
-		horiz.setEnableOverflow(false);
 		
 		ObjectParameter p = (ObjectParameter) parameter;
 		
@@ -60,12 +53,16 @@ public class StringFld extends AbstractFld {
 			descr.addStyleName("workflow-fieldDescription");
 		}
 		
+		fieldContainer=new SimpleContainer();
+		HBoxLayoutContainer horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
+
 		horiz.add(textField,new BoxLayoutData(new Margins()));
 		horiz.add(descr,new BoxLayoutData(new Margins()));
+		fieldContainer.add(horiz,new MarginData(new Margins()));
 	
-		/*horiz.add(textField, new HorizontalLayoutData(-1,-1,new Margins()));
+		fieldContainer.forceLayout();
-		horiz.add(descr,new HorizontalLayoutData(1,-1,new Margins()));*/
-		simpleContainer.add(horiz);
 	}
 
 	/**
@@ -81,7 +78,7 @@ public class StringFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return simpleContainer;
+		return fieldContainer;
 	}
 
 }

src/main/java/org/gcube/portlets/user/dataminermanager/client/parametersfield/TabularFld.java

@@ -10,6 +10,9 @@ import java.util.List;
 import org.gcube.portlets.user.dataminermanager.client.DataMinerManager;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
 import org.gcube.portlets.user.dataminermanager.client.bean.parameters.TabularParameter;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent.HasTabularFldChangeEventHandler;
+import org.gcube.portlets.user.dataminermanager.client.events.TabularFldChangeEvent.TabularFldChangeEventHandler;
 import org.gcube.portlets.user.dataminermanager.client.rpc.DataMinerPortletServiceAsync;
 import org.gcube.portlets.user.dataminermanager.client.util.UtilsGXT3;
 import org.gcube.portlets.user.dataminermanager.shared.data.TableItemSimple;
@@ -20,17 +23,23 @@ import org.gcube.portlets.widgets.wsexplorer.shared.Item;
 import org.gcube.portlets.widgets.wsexplorer.shared.ItemType;
 
 import com.allen_sauer.gwt.log.client.Log;
+import com.google.gwt.event.shared.GwtEvent;
+import com.google.gwt.event.shared.HandlerRegistration;
 import com.google.gwt.user.client.rpc.AsyncCallback;
-import com.google.gwt.user.client.ui.HTML;
 import com.google.gwt.user.client.ui.Widget;
 import com.sencha.gxt.core.client.dom.XDOM;
 import com.sencha.gxt.core.client.util.Format;
+import com.sencha.gxt.core.client.util.Margins;
 import com.sencha.gxt.widget.core.client.button.TextButton;
-import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutData;
+import com.sencha.gxt.widget.core.client.container.BoxLayoutContainer.BoxLayoutPack;
+import com.sencha.gxt.widget.core.client.container.HBoxLayoutContainer;
+import com.sencha.gxt.widget.core.client.container.HtmlLayoutContainer;
 import com.sencha.gxt.widget.core.client.container.MarginData;
 import com.sencha.gxt.widget.core.client.container.SimpleContainer;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
+import com.sencha.gxt.widget.core.client.form.TextField;
 
 /**
  * 
@@ -38,17 +47,17 @@ import com.sencha.gxt.widget.core.client.event.SelectEvent;
  * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
  *
  */
-public class TabularFld extends AbstractFld {
+public class TabularFld extends AbstractFld implements HasTabularFldChangeEventHandler {
 	
-	private SimpleContainer sc;
+	private SimpleContainer fieldContainer;
+	private HBoxLayoutContainer horiz;
 	private VerticalLayoutContainer vp;
 	
-	// TableSelector tableSelector;
 	private WorkspaceExplorerSelectDialog wselectDialog;
 	private TextButton selectButton, selectButton2, cancelButton;
-	private HTML templatesList;
+	private HtmlLayoutContainer templatesList;
 	private TableItemSimple selectedTableItem = null;
-	private List<AbstractFld> listeners = new ArrayList<AbstractFld>();
+	//private List<AbstractFld> listeners = new ArrayList<AbstractFld>();
 
 	/**
 	 * @param parameter
@@ -56,11 +65,36 @@ public class TabularFld extends AbstractFld {
 	public TabularFld(Parameter parameter) {
 		super(parameter);
 		Log.debug("TabularField");
+	
+		SimpleContainer tabContainer=new SimpleContainer();
 		vp=new VerticalLayoutContainer();
 		init();
-		sc=new SimpleContainer();
+		tabContainer.add(vp, new MarginData(new Margins(0)));
-		sc.add(vp, new MarginData(0));
+		
+		fieldContainer = new SimpleContainer();
+		horiz = new HBoxLayoutContainer();
+		horiz.setPack(BoxLayoutPack.START);
+		horiz.setEnableOverflow(false);
+		
+		HtmlLayoutContainer descr;
+
+		if (parameter.getDescription() == null) {
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'></p>");
+			descr.addStyleName("workflow-fieldDescription");
+
+		} else {
+			tabContainer.setToolTip(parameter.getDescription());
+			descr = new HtmlLayoutContainer("<p style='margin-left:5px;'>"
+					+ parameter.getDescription() + "</p>");
+			descr.addStyleName("workflow-fieldDescription");
+		}
+
+		horiz.add(tabContainer, new BoxLayoutData(new Margins()));
+		horiz.add(descr, new BoxLayoutData(new Margins()));
+
+		fieldContainer.add(horiz);
 		showNoSelectionField();
+		
 	}
 	
 	
@@ -68,17 +102,6 @@ public class TabularFld extends AbstractFld {
 		TabularParameter p = (TabularParameter) parameter;
 		List<String> templates = p.getTemplates();
 
-		/*
-		 * tableSelector = new TableSelector(templates) {
-		 * 
-		 * @Override public void fireSelection(TableItemSimple tableItem) {
-		 * super.fireSelection(tableItem); selectedTableItem = tableItem;
-		 * showFieldWithSelection();
-		 * 
-		 * loadTableMetadata(tableItem); // send change message to all listeners
-		 * // it will be managed by all columnFields and columnListField that
-		 * depends by tabular field } };
-		 */
 		List<ItemType> selectableTypes = new ArrayList<ItemType>();
 		selectableTypes.add(ItemType.EXTERNAL_FILE);
 		List<ItemType> showableTypes = new ArrayList<ItemType>();
@@ -183,11 +206,11 @@ public class TabularFld extends AbstractFld {
 		String list = "";
 		boolean first = true;
 		for (String template : templates) {
-			list += (first ? "" : ", ") + template;
+			list += (first ? "" : ", ") + Format.ellipse(template,50);
 			first = false;
 		}
-		templatesList = new HTML("Suitable Data Set Templates: <br>" + list);
+		templatesList = new HtmlLayoutContainer("<p>Suitable Data Set Templates: <br>" + list+"</p>");
-		templatesList.addStyleName("workflow-templatesList");
+		templatesList.addStyleName("workflow-parameters-description");
 
 		
 	}
@@ -200,7 +223,6 @@ public class TabularFld extends AbstractFld {
 				Log.error("Error in retrieveTableInformation " + caught.getMessage());
 				if (caught instanceof ExpiredSessionServiceException) {
 					UtilsGXT3.alert("Error", "Expired Session");
-					//sessionExpiredShowDelayed();
 					
 				} else {
 					UtilsGXT3.alert(
@@ -216,53 +238,13 @@ public class TabularFld extends AbstractFld {
 				Log.debug("Retrieved: "+result);
 				selectedTableItem=result;
 				showFieldWithSelection();
-				//loadTableMetadata(selectedTableItem);
 				updateListeners(selectedTableItem);
 			}
 		});	
 	}
 
-	/**
-	 * @param tableItem
 	
-	protected void loadTableMetadata(final TableItemSimple tableItem) {
-		//TabularData tabularData = DataMinerManager.getTabularData();
-		String tableId = tableItem.getId();
 
-		tabularData.getTableDefinition(tableId,
-				new AsyncCallback<TableDefinition>() {
-
-					@Override
-					public void onFailure(Throwable caught) {
-						vp.unmask();
-						Info.display("ERROR", "");
-					}
-
-					@Override
-					public void onSuccess(TableDefinition tableDefinition) {
-						vp.unmask();
-						List<ColumnDefinition> columns = tableDefinition
-								.getColumnsAsList();
-						Collections.sort(columns, new ColumnPositionComparator(
-								false));
-						for (ColumnDefinition column : columns)
-							tableItem.addColumnName(column.getLabel());
-						updateListeners(tableItem);
-					}
-
-				});
-
-		vp.mask("Load Data Set Metadata...", Constants.maskLoadingStyle);
-	}*/
-
-	/**
-	 * @param id
-	 */
-	protected void updateListeners(TableItemSimple tableItem) {
-		for (AbstractFld abstractField : listeners) {
-			abstractField.fireEvent(tableItem);
-		}
-	}
 	
 	/**
 	 * 
@@ -271,22 +253,25 @@ public class TabularFld extends AbstractFld {
 		vp.clear();
 		vp.add(selectButton);
 		vp.add(templatesList);
-		sc.forceLayout();
+		fieldContainer.forceLayout();
 	}
 
 	/**
 	 * 
 	 */
 	private void showFieldWithSelection() {
-		//final String tableId = selectedTableItem.getId();
+		String tableName = selectedTableItem.getName();
-		final String tableName = selectedTableItem.getName();
 
-		vp.clear();
+		if(tableName==null|| tableName.isEmpty()){
-		HorizontalLayoutContainer hp = new HorizontalLayoutContainer();
+			tableName="NoName";
-		hp.add(new HTML("<div class='workflow-parameters-tableDescription'>"
+		}
-				+ Format.ellipse(tableName, 30) + "</div>"));
+		
-		hp.add(selectButton2);
+		TextField tableDescription=new TextField();
-		hp.add(cancelButton);
+		tableDescription.setValue(tableName);
+		tableDescription.setReadOnly(true);
+		
+		/*HTML tableDescription=new HTML("<div class='workflow-parameters-tableDescription'>"
+				+ Format.ellipse(tableName, 30) + "</div>");*/
 		
 		TextButton openTableButton = new TextButton("Open Data Set");
 		openTableButton.addSelectHandler(new SelectEvent.SelectHandler() {
@@ -319,10 +304,16 @@ public class TabularFld extends AbstractFld {
 			}
 		});
 		
-		hp.add(openTableButton);
+		
-		vp.add(hp);
+		HBoxLayoutContainer h=new HBoxLayoutContainer();
+		h.add(tableDescription,new BoxLayoutData(new Margins()));
+		h.add(selectButton2,new BoxLayoutData(new Margins()));
+		h.add(cancelButton,new BoxLayoutData(new Margins()));
+		vp.clear();
+		vp.add(h);
 		vp.add(templatesList);
-		sc.forceLayout();
+		vp.forceLayout();
+		fieldContainer.forceLayout();
 	}
 
 	/**
@@ -338,7 +329,7 @@ public class TabularFld extends AbstractFld {
 	 */
 	@Override
 	public Widget getWidget() {
-		return sc;
+		return fieldContainer;
 	}
 
 	/**
@@ -349,7 +340,25 @@ public class TabularFld extends AbstractFld {
 		return (selectedTableItem != null);
 	}
 
-	public void addChangeListener(AbstractFld abstractField) {
+
-		this.listeners.add(abstractField);
+
+	@Override
+	public HandlerRegistration addTabularFldChangeEventHandler(
+			TabularFldChangeEventHandler handler) {
+		return fieldContainer.addHandler(handler, TabularFldChangeEvent.getType());
+		
+	}
+
+	
+	
+	private void updateListeners(TableItemSimple tableItemSimple) {
+		TabularFldChangeEvent event=new TabularFldChangeEvent(tableItemSimple);
+		fireEvent(event);
+	}
+
+
+	@Override
+	public void fireEvent(GwtEvent<?> event) {
+		fieldContainer.fireEvent(event);		
 	}
 }

src/main/webapp/DataMinerManager.css

@@ -296,9 +296,9 @@
 
 .workflow-parameters-preload {
 	display: block;
-	margin: auto;
+	background: url('ajax-loader-big.gif') no-repeat;
-	margin-left: auto;
+	width: 400px;
-	margin-right: auto;
+	height: 180px;
 }
 
 /* TOOLTIP */