Java tutorial
/* * Copyright 2013 JBoss Inc * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.overlord.sramp.ui.client.local.pages.ontologies; import java.util.Iterator; import java.util.List; import javax.annotation.PostConstruct; import javax.enterprise.context.Dependent; import javax.enterprise.inject.Instance; import javax.inject.Inject; import org.overlord.commons.gwt.client.local.widgets.UnorderedListPanel; import org.overlord.sramp.ui.client.local.ClientMessages; import org.overlord.sramp.ui.client.shared.beans.OntologySummaryBean; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.logical.shared.HasSelectionHandlers; 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.event.shared.HandlerRegistration; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.HasValue; import com.google.gwt.user.client.ui.Widget; /** * The Ontology summaries panel. * * @author Brett Meyer */ @Dependent public class OntologySummaryPanel extends FlowPanel implements HasValue<List<OntologySummaryBean>>, HasSelectionHandlers<OntologySummaryBean> { List<OntologySummaryBean> value = null; OntologySummaryPanelItem selected = null; @Inject ClientMessages i18n; @Inject Instance<OntologySummaryPanelItem> itemFactory; @Inject FlowPanel header; @Inject UnorderedListPanel items; /** * Constructor. */ public OntologySummaryPanel() { } /** * Called after the widget is created. */ @PostConstruct protected void postConstruct() { setStyleName("ontologies-canvas"); //$NON-NLS-1$ header.getElement().setClassName("sramp-ontology-box-header"); //$NON-NLS-1$ header.getElement().setInnerText(i18n.format("ontologies.ontologies")); items.setStyleName("nav"); //$NON-NLS-1$ items.addStyleName("nav-pills"); //$NON-NLS-1$ items.addStyleName("nav-stacked"); //$NON-NLS-1$ add(header); add(items); } /** * @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler) */ @Override public HandlerRegistration addValueChangeHandler(ValueChangeHandler<List<OntologySummaryBean>> handler) { return addHandler(handler, ValueChangeEvent.getType()); } /** * @see com.google.gwt.user.client.ui.HasValue#getValue() */ @Override public List<OntologySummaryBean> getValue() { return value; } /** * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object) */ @Override public void setValue(List<OntologySummaryBean> value) { setValue(value, false); } /** * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object, boolean) */ @Override public void setValue(List<OntologySummaryBean> value, boolean fireEvents) { this.value = value; if (fireEvents) { ValueChangeEvent.fire(this, value); } items.clear(); for (OntologySummaryBean ontologyClass : value) { OntologySummaryPanelItem item = createItem(ontologyClass); items.add(item); } } /** * Creates an item from the given ontology class bean. * @param ontologyClass */ private OntologySummaryPanelItem createItem(OntologySummaryBean ontologyClass) { final OntologySummaryPanelItem item = itemFactory.get(); item.addValueChangeHandler(new ValueChangeHandler<OntologySummaryBean>() { @Override public void onValueChange(ValueChangeEvent<OntologySummaryBean> event) { // If the event value is null, that means we should remove the item. if (event.getValue() == null) { removeItem(item); } ValueChangeEvent.fire(OntologySummaryPanel.this, OntologySummaryPanel.this.value); } }); item.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { selectItem(item); } }); item.setValue(ontologyClass); return item; } /** * Removes the ontology item/class. This removes it both from the value {@link List} * as well as from the UI. * @param item */ protected void removeItem(OntologySummaryPanelItem item) { // When deleting the currently selected item, make sure to fire a // "deselected" event so that any forward tiers are removed from the UI. if (item == selected) { selected = null; SelectionEvent.fire(this, null); } items.remove(item); value.remove(item.getValue()); } /** * Selects a specific item in the tier. * @param item */ protected void selectItem(OntologySummaryPanelItem item) { OntologySummaryPanelItem oldSelection = selected; OntologySummaryPanelItem newSelection = item; if (oldSelection != null) { oldSelection.getElement().removeClassName("active"); //$NON-NLS-1$ oldSelection.hideActions(); } if (oldSelection == newSelection) { selected = null; SelectionEvent.fire(this, null); } else { newSelection.getElement().addClassName("active"); //$NON-NLS-1$ selected = newSelection; OntologySummaryBean bean = selected.getValue(); SelectionEvent.fire(this, bean); } } /** * Restores a selected item by UUID. Useful when OntologiesPage needs to completely replace the ontologies * after a new one has been uploaded. * * @param uuid */ public void restoreSelectedItem(String uuid) { Iterator<Widget> itr = items.iterator(); while (itr.hasNext()) { OntologySummaryPanelItem item = (OntologySummaryPanelItem) itr.next(); if (item.getValue().getUuid() != null && item.getValue().getUuid().equals(uuid)) { item.getElement().addClassName("active"); //$NON-NLS-1$ selected = item; selected.showActions(); // no need to re-fire the event } } } /** * @see com.google.gwt.event.logical.shared.HasSelectionHandlers#addSelectionHandler(com.google.gwt.event.logical.shared.SelectionHandler) */ @Override public HandlerRegistration addSelectionHandler(SelectionHandler<OntologySummaryBean> handler) { return addHandler(handler, SelectionEvent.getType()); } public OntologySummaryBean getSelectedOntology() { return selected == null ? null : selected.getValue(); } }