tabular-data-column-widget/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java

package org.gcube.portlets.user.td.columnwidget.client;

import java.util.ArrayList;

import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.sencha.gxt.cell.core.client.form.ComboBoxCell.TriggerAction;
import com.sencha.gxt.core.client.util.Margins;
import com.sencha.gxt.data.client.loader.RpcProxy;
import com.sencha.gxt.data.shared.LabelProvider;
import com.sencha.gxt.data.shared.ListStore;
import com.sencha.gxt.data.shared.loader.ListLoadConfig;
import com.sencha.gxt.data.shared.loader.ListLoadResult;
import com.sencha.gxt.data.shared.loader.ListLoadResultBean;
import com.sencha.gxt.data.shared.loader.ListLoader;
import com.sencha.gxt.data.shared.loader.LoadResultListStoreBinding;
import com.sencha.gxt.widget.core.client.ContentPanel;
import com.sencha.gxt.widget.core.client.FramedPanel;
import com.sencha.gxt.widget.core.client.button.TextButton;
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;
import com.sencha.gxt.widget.core.client.form.FieldLabel;
import com.sencha.gxt.widget.core.client.form.TextField;
import com.sencha.gxt.widget.core.client.info.Info;

public class ChangeColumnTypePanel extends FramedPanel {
	protected String WIDTH = "640px";
	protected String HEIGHT = "520px";
	
	protected ChangeColumnTypeDialog parent;
	protected TextField label=null;
	protected TRId trId;
	protected String columnName;
	protected ColumnData column;
	protected ComboBox<ColumnData> combo=null;
	
	
	public ChangeColumnTypePanel(TRId trId, String columnName){
		setWidth(WIDTH);
		setHeight(HEIGHT);
		setHeaderVisible(false);
		setBodyBorder(false);
		this.trId=trId;
		this.columnName=columnName;
		
		VerticalLayoutContainer basicLayout = new VerticalLayoutContainer();
	    
		ContentPanel panel = new ContentPanel();
		panel.setHeaderVisible(false);
		
		ColumnDataProperties props = GWT.create(ColumnDataProperties.class);
		ListStore<ColumnData> store = new ListStore<ColumnData>(props.id());
		
		Log.trace("Store created");
		RpcProxy<ListLoadConfig, ListLoadResult<ColumnData>> proxy = new RpcProxy<ListLoadConfig,  ListLoadResult<ColumnData>>() {
			
			public void load(ListLoadConfig loadConfig, final AsyncCallback<ListLoadResult<ColumnData>> callback) {
				loadData(loadConfig, callback);
			}	
		};
		final ListLoader<ListLoadConfig, ListLoadResult<ColumnData>> loader = new ListLoader<ListLoadConfig, ListLoadResult<ColumnData>>(proxy);
		loader.setRemoteSort(false);
		loader.addLoadHandler(new LoadResultListStoreBinding<ListLoadConfig, ColumnData, ListLoadResult<ColumnData>>(store));
		Log.trace("Loader created");
		
		
		combo = new ComboBox<ColumnData>(store,
				props.label()){
			@Override
			protected void onAfterFirstAttach() {
				super.onAfterFirstAttach();
				Scheduler.get().scheduleDeferred(new ScheduledCommand() {
					public void execute() {
						loader.load();
					}
				});
			}
		};
		Log.trace("Combo created");
		
		addHandlersForEventObservation(combo, props.label());

		combo.setEmptyText("Select a column...");
		combo.setWidth(150);
		combo.setTypeAhead(true);
		combo.setTriggerAction(TriggerAction.ALL);
		combo.setLoader(loader);
		
		FramedPanel form = new FramedPanel();
	    form.setHeaderVisible(false);
	    //form.setWidth(350);
	    form.setBodyStyle("background: none;");
	 
	    VerticalLayoutContainer v = new VerticalLayoutContainer();
	    v.add(new FieldLabel(combo, "Column"), new VerticalLayoutData(1, -1));
	    form.add(v);
	    form.addButton(new TextButton("Change"));
	   
	    
	    panel.add(form);
	    basicLayout.add(panel, new VerticalLayoutData(-1, -1, new Margins()));
		add(basicLayout);

	}

	private <T> void addHandlersForEventObservation(ComboBox<T> combo,
			final LabelProvider<T> labelProvider) {
		combo.addValueChangeHandler(new ValueChangeHandler<T>() {

			public void onValueChange(ValueChangeEvent<T> event) {
				Info.display(
						"Value Changed",
						"New value: "
								+ (event.getValue() == null ? "nothing"
										: labelProvider.getLabel(event
												.getValue()) + "!"));
				
			}
		});
		combo.addSelectionHandler(new SelectionHandler<T>() {
			public void onSelection(SelectionEvent<T> event) {
				Info.display(
						"State Selected",
						"You selected "
								+ (event.getSelectedItem() == null ? "nothing"
										: labelProvider.getLabel(event
												.getSelectedItem()) + "!"));
			}
		});
	}
	

		
		

	protected void loadData(ListLoadConfig loadConfig,
			final AsyncCallback<ListLoadResult<ColumnData>> callback) {
		TDGWTServiceAsync.INSTANCE.getColumns(trId, new AsyncCallback<ArrayList<ColumnData>>(){

			public void onFailure(Throwable caught) {
				Log.error("load combo failure:"+caught.getLocalizedMessage());
				callback.onFailure(caught);
			}

			public void onSuccess(ArrayList<ColumnData> result) {
				Log.trace("loaded " + result.size() + " ColumnData");
				if(columnName!=null){
					for(ColumnData cd: result){
						if(cd.getName().compareTo(columnName)==0){
							combo.setValue(cd);
						}
					}
				}
				callback.onSuccess(new ListLoadResultBean<ColumnData>(
						result));
				
			}
			
		});
				
	}

	
}