data-miner-manager/src/main/java/org/gcube/portlets/user/dataminermanager/client/form/ColumnListFld.java

/**
 * 
 */
package org.gcube.portlets.user.dataminermanager.client.form;

import java.util.ArrayList;
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.properties.ColumnItemProperties;
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.core.client.IdentityValueProvider;
import com.sencha.gxt.core.client.Style.SelectionMode;
import com.sencha.gxt.data.shared.ListStore;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
import com.sencha.gxt.widget.core.client.grid.CheckBoxSelectionModel;
import com.sencha.gxt.widget.core.client.grid.ColumnConfig;
import com.sencha.gxt.widget.core.client.grid.ColumnModel;
import com.sencha.gxt.widget.core.client.grid.Grid;

/**
 * 
 * @author Giancarlo Panichi email: <a
 *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
 *
 */
public class ColumnListFld extends AbstractFld {

	
	private VerticalLayoutContainer vp;
	private ColumnListParameter columnListParameter;
	private ListStore<ColumnItem> store;
	private Grid<ColumnItem> grid;
	private CheckBoxSelectionModel<ColumnItem> sm;

	/**
	 * 
	 * @param parameter
	 */
	public ColumnListFld(Parameter parameter) {
		super(parameter);

		this.columnListParameter = (ColumnListParameter) parameter;
		vp = new VerticalLayoutContainer();
		init();
		showNoSelectionField();
	}

	private void init() {
		ColumnItemProperties props = GWT.create(ColumnItemProperties.class);

		ColumnConfig<ColumnItem, String> labelCol = new ColumnConfig<ColumnItem, String>(
				props.label());

		IdentityValueProvider<ColumnItem> identity = new IdentityValueProvider<ColumnItem>();
		sm = new CheckBoxSelectionModel<ColumnItem>(identity);

		List<ColumnConfig<ColumnItem, ?>> l = new ArrayList<ColumnConfig<ColumnItem, ?>>();
		l.add(sm.getColumn());
		l.add(labelCol);
		ColumnModel<ColumnItem> cm = new ColumnModel<ColumnItem>(l);

		store = new ListStore<ColumnItem>(props.id());
		
		grid = new Grid<ColumnItem>(store, cm);
		
		sm.setSelectionMode(SelectionMode.MULTI);
		grid.setSelectionModel(sm);
		// grid.getView().setAutoExpandColumn(labelCol);
		grid.setSize("150px", "150px");
		grid.getView().setStripeRows(true);
		grid.getView().setColumnLines(true);
		grid.getView().setAutoFill(true);
		grid.setBorders(false);
		grid.setLoadMask(true);
		grid.setColumnReordering(true);
		grid.setColumnResize(false);
		grid.disable();
		
	}

	/**
	 * 
	 */
	private void showNoSelectionField() {
		vp.clear();
		vp.add(grid);
		vp.add(new HTML(
				"<div class='workflow-parameters-description'>Select table from parameter "
						+ this.columnListParameter
								.getReferredTabularParameterName() + "</div>"));
		vp.forceLayout();
	}

	/**
	 * 
	 */
	private void showFieldWithSelection(TableItemSimple tableItem) {
		vp.clear();
		vp.add(grid);
		vp.add(new HTML(
				"<div class='workflow-parameters-description'>Columns of Data Set "
						+ tableItem.getName() + "</div>"));
		vp.forceLayout();
	}

	
	/**
	 * 
	 */
	@Override
	public String getValue() {
		String separator = columnListParameter.getSeparator();
		String value = "";
		boolean first = true;
	
		for (ColumnItem columnItem : sm.getSelection()) {
			String columnName =  columnItem.getName();
			value += (first ? "" : separator) + columnName;
			first = false;
		}
		return value;
	}

	/**
	 * 
	 */
	@Override
	public Widget getWidget() {
		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);
		}
	}

	/**
	 * 
	 */
	@Override
	public boolean isValid() {
		return store.size() > 0;
	}

}