Hey Vaadin-Users!
I’m not able to get my TreeGrid Drag and Drop like an Grid. I’m using the newest version of vaadin 8.1.0.rc1. I always get the same error and I don’t know what i should use instead of ListDataProvider. When I’m using TreeDataProvider I get errors with .getItems() function :
[code]
15:42:29,998 SEVERE [com.vaadin.server.DefaultErrorHandler]
(default task-94) : java.lang.ClassCastException: com.vaadin.data.provider.TreeDataProvider cannot be cast to com.vaadin.data.provider.ListDataProvider
at org.test.MyUI.lambda$9(MyUI.java:123)
at java.util.Optional.ifPresent(Optional.java:159)
at org.test.MyUI.lambda$8(MyUI.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:211)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:174)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1029)
at com.vaadin.ui.components.grid.TreeGridDropTarget.lambda$registerDropTargetRpc$4d5e56ef$1(TreeGridDropTarget.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:445)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:410)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1577)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:381)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:130)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
15:42:30,044 SEVERE [com.vaadin.server.DefaultErrorHandler]
(default task-95) : java.lang.ClassCastException: com.vaadin.data.provider.TreeDataProvider cannot be cast to com.vaadin.data.provider.ListDataProvider
at org.test.MyUI.lambda$7(MyUI.java:107)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:211)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:174)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1029)
at com.vaadin.ui.components.grid.GridDragSource.access$200(GridDragSource.java:48)
at com.vaadin.ui.components.grid.GridDragSource$1.dragEnd(GridDragSource.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:445)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:410)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1577)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:381)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:130)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
[/code]this is my Java-File:
package org.test;
import java.io.File;
import java.sql.Date;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ThreadLocalRandom;
import javax.servlet.annotation.WebServlet;
import org.jsoup.Jsoup;
import org.jsoup.safety.Whitelist;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.data.TreeData;
import com.vaadin.data.provider.ListDataProvider;
import com.vaadin.data.provider.TreeDataProvider;
import com.vaadin.icons.VaadinIcons;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.shared.ui.dnd.DropEffect;
import com.vaadin.shared.ui.dnd.EffectAllowed;
import com.vaadin.shared.ui.grid.DropLocation;
import com.vaadin.shared.ui.grid.DropMode;
import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.Button;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Notification;
import com.vaadin.ui.Notification.Type;
import com.vaadin.ui.TextField;
import com.vaadin.ui.Tree;
import com.vaadin.ui.TreeGrid;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.components.grid.GridDragSource;
import com.vaadin.ui.components.grid.GridDropTarget;
import com.vaadin.ui.components.grid.TreeGridDragSource;
import com.vaadin.ui.components.grid.TreeGridDropTarget;
import com.vaadin.ui.dnd.DragSourceExtension;
import com.vaadin.ui.dnd.DropTargetExtension;
import com.vaadin.ui.renderers.DateRenderer;
import com.vaadin.ui.renderers.HtmlRenderer;
import com.vaadin.ui.themes.ValoTheme;
/**
* This UI is the application entry point. A UI may either represent a browser window
* (or tab) or some part of a html page where a Vaadin application is embedded.
* <p>
* The UI is initialized using {@link #init(VaadinRequest)}. This method is intended to be
* overridden to add component to the user interface and initialize non-component functionality.
*/
@Theme("mytheme")
public class MyUI extends UI {
private Set<Menu> draggedItems;
@Override
protected void init(VaadinRequest vaadinRequest) {
final HorizontalLayout layout = new HorizontalLayout();
TreeGrid<Menu> treeGrid = new TreeGrid<>();
treeGrid.setItems(generateMenusForYears(2010, 2016), Menu::getSubMenus);
TextField nameEditor = new TextField();
treeGrid.addColumn(Menu::getName).setCaption("Project Name").setId("name-column").setEditorComponent(nameEditor, Menu::setName);
treeGrid.getEditor().setEnabled(true);
// treeGrid.addContextClickListener(event -> Notification.show((TreeContextClickEvent<Person>)event).getItem() + " Clicked");
treeGrid.addCollapseListener(event -> {
Notification.show(
"Menu '" + event.getCollapsedItem().getName() + "' collapsed.",
Type.TRAY_NOTIFICATION);
});
treeGrid.addExpandListener(event -> {
Notification.show(
"Menu '" + event.getExpandedItem().getName()+ "' expanded.",
Type.TRAY_NOTIFICATION);
});
TreeGridDragSource<Menu> dragSource = new TreeGridDragSource<>(treeGrid);
// set allowed effects
dragSource.setEffectAllowed(EffectAllowed.MOVE);
// add a drag data generator
dragSource.setDragDataGenerator("text", menu -> {
return menu.getName();
});
dragSource.addGridDragStartListener(event ->
// Keep reference to the dragged items
draggedItems = event.getDraggedItems()
);
// Add drag end listener
dragSource.addGridDragEndListener(event -> {
// If drop was successful, remove dragged items from source Grid
if (event.getDropEffect() == DropEffect.MOVE) {
((ListDataProvider<Menu>) treeGrid.getDataProvider()).getItems().removeAll(draggedItems);
treeGrid.getDataProvider().refreshAll();
// Remove reference to dragged items
draggedItems = null;
}
});
TreeGridDropTarget<Menu> dropTarget = new TreeGridDropTarget<>(treeGrid, DropMode.BETWEEN);
dropTarget.setDropEffect(DropEffect.MOVE);
dropTarget.addTreeGridDropListener(event -> {
// Accepting dragged items from another Grid in the same UI
event.getDragSourceExtension().ifPresent(source -> {
if (source instanceof TreeGridDragSource) {
// Get the target Grid's items
ListDataProvider<Menu> dataProvider = (ListDataProvider<Menu>)
event.getComponent().getDataProvider();
List<Menu> items = (List<Menu>) dataProvider.getItems();
// Calculate the target row's index
int index = items.size();
if (event.getDropTargetRow().isPresent()) {
index = items.indexOf(event.getDropTargetRow().get()) + (
event.getDropLocation() == DropLocation.BELOW ? 1 : 0);
}
// Add dragged items to the target Grid
items.addAll(index, draggedItems);
dataProvider.refreshAll();
// Show the dropped data
Notification.show("Dropped row data: " + event.getDataTransferText());
}
});
});
layout.addComponent(treeGrid);
treeGrid.setWidth("15%");
/*
tree.setDataProvider(new TreeDataProvider<>(data));
tree.expand("Desktops", "Laptops");
tree.setItemIconGenerator(item -> {
if (item.equals("Desktops")) {
return VaadinIcons.DESKTOP;
} else if (item.equals("Laptops")) {
return VaadinIcons.LAPTOP;
}
return null;
});
*/
Label draggableLabel = new Label("You can grab and drag me");
DragSourceExtension<Label> dragSource1 = new DragSourceExtension<>(draggableLabel);
// set the allowed effect
dragSource1.setEffectAllowed(EffectAllowed.MOVE);
// set the text to transfer
dragSource1.setDataTransferText("hello receiver");
// set other data to transfer (in this case HTML)
dragSource1.setDataTransferData("text/html", "<label>hello receiver</label>");
dragSource1.addDragStartListener(event -> { Notification.show("Drag event started"); });
dragSource1.addDragEndListener(event -> {
if (event.isCanceled()) {
Notification.show("Drag event was canceled");
} else {
Notification.show("Drag event finished");
}
});
VerticalLayout dropTargetLayout = new VerticalLayout();
dropTargetLayout.setCaption("Drop things inside me");
dropTargetLayout.addStyleName(ValoTheme.LAYOUT_CARD);
// make the layout accept drops
DropTargetExtension<VerticalLayout> dropTarget1 = new DropTargetExtension<>(dropTargetLayout);
// the drop effect must match the allowed effect in the drag source for a successful drop
dropTarget1.setDropEffect(DropEffect.MOVE);
// catch the drops
dropTarget1.addDropListener(event -> {
// if the drag source is in the same UI as the target
Optional<AbstractComponent> dragSource2 = event.getDragSourceComponent();
if (dragSource2.isPresent() && dragSource2.get() instanceof Label) {
// move the label to the layout
dropTargetLayout.addComponent(dragSource2.get());
// get possible transfer data
String message = event.getDataTransferText();
if (message != null) {
Notification.show("DropEvent with data transfer html: " + message);
} else {
// get transfer text
message = event.getDataTransferText();
Notification.show("DropEvent with data transfer text: " + message);
}
// handle possible server side drag data, if the drag source was in the same UI
// event.getDragData().ifPresent(data -> handleMyDragData((MyObject) data));
}
});
layout.addComponent(treeGrid);
VerticalLayout components = new VerticalLayout();
components.addComponent(draggableLabel);
components.addComponent(dropTargetLayout);
layout.addComponent(components);
setContent(layout);
}
private List<Menu> generateMenusForYears(int startYear, int endYear) {
List<Menu> menus = new ArrayList<>();
for (int year = startYear; year <= endYear; year++) {
Menu yearMenu = new Menu("Year " + year);
for (int i = 1; i < 2 + ThreadLocalRandom.current().nextInt(5); i++) {
Menu customerMenu = new Menu("Customer Project " + i);
customerMenu.setSubMenus(Arrays.asList(
new LeafMenu("Implementation", ThreadLocalRandom.current().nextInt(100), year),
new LeafMenu("Planning", ThreadLocalRandom.current().nextInt(10), year),
new LeafMenu("Prototyping", ThreadLocalRandom.current().nextInt(20), year)));
yearMenu.addSubMenu(customerMenu);
}
menus.add(yearMenu);
}
return menus;
}
@WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
@VaadinServletConfiguration(ui = MyUI.class, productionMode = false)
public static class MyUIServlet extends VaadinServlet {
}
}I would be really thankful if someone could help.
Best regards,
Dominik
