Java tutorial
/* * Copyright 2010 Google 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 simplejcqrs.gae.client; import simplejcqrs.commands.HumanCommands; import simplejcqrs.gae.shared.ContactInfo; import com.google.gwt.cell.client.AbstractCell; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.resources.client.ClientBundle; import com.google.gwt.resources.client.ImageResource; import com.google.gwt.safehtml.shared.SafeHtmlBuilder; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.cellview.client.CellList; import com.google.gwt.user.cellview.client.HasKeyboardPagingPolicy.KeyboardPagingPolicy; import com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy; import com.google.gwt.user.client.Random; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.AbstractImagePrototype; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.DialogBox; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; import com.google.gwt.view.client.SelectionChangeEvent; import com.google.gwt.view.client.SingleSelectionModel; /** * Example file. */ public class CwCellList extends Composite { /** * The UiBinder interface used by this example. */ interface Binder extends UiBinder<Widget, CwCellList> { } /** * The images used for this example. */ static interface Images extends ClientBundle { ImageResource contact(); } /** * The Cell used to render a {@link ContactInfo}. */ static class ContactCell extends AbstractCell<ContactInfo> { /** * The html of the image used for contacts. */ private final String imageHtml; public ContactCell(ImageResource image) { this.imageHtml = AbstractImagePrototype.create(image).getHTML(); } @Override public void render(Context context, ContactInfo value, SafeHtmlBuilder sb) { // Value can be null, so do a null check.. if (value == null) { return; } sb.appendHtmlConstant("<table>"); // Add the contact image. sb.appendHtmlConstant("<tr><td rowspan='3'>"); sb.appendHtmlConstant(imageHtml); sb.appendHtmlConstant("</td>"); // Add the name and address. sb.appendHtmlConstant("<td style='font-size:95%;'>"); sb.appendEscaped(value.getFullName()); sb.appendHtmlConstant("</td></tr><tr><td>"); String addr = value.getAddress(); sb.appendEscaped(addr == null ? "<unknown>" : addr); sb.appendHtmlConstant("</td></tr></table>"); } } /** * The contact form used to update contacts. @UiField ContactInfoForm contactForm; */ @UiField Button reloadButton; @UiField Button createButton; /** * The pager used to change the range of data. */ @UiField ShowMorePagerPanel pagerPanel; /** * The pager used to display the current range. */ @UiField RangeLabelPager rangeLabelPager; @UiField ContactForm contactForm; /** * The CellList. */ private CellList<ContactInfo> cellList; /** * Constructor. * * @param constants the constants */ public CwCellList() { initWidget(onInitialize()); } /** * Initialize this example. */ public Widget onInitialize() { Images images = GWT.create(Images.class); // Create a CellList. ContactCell contactCell = new ContactCell(images.contact()); // Set a key provider that provides a unique key for each contact. If key is // used to identify contacts when fields (such as the name and address) // change. cellList = new CellList<ContactInfo>(contactCell, ContactInfo.KEY_PROVIDER); cellList.setPageSize(30); cellList.setKeyboardPagingPolicy(KeyboardPagingPolicy.INCREASE_RANGE); cellList.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.BOUND_TO_SELECTION); // Add a selection model so we can select cells. final SingleSelectionModel<ContactInfo> selectionModel = new SingleSelectionModel<ContactInfo>( ContactInfo.KEY_PROVIDER); cellList.setSelectionModel(selectionModel); selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() { public void onSelectionChange(SelectionChangeEvent event) { contactForm.setContact(selectionModel.getSelectedObject()); } }); // Create the UiBinder. Binder uiBinder = GWT.create(Binder.class); Widget widget = uiBinder.createAndBindUi(this); // Add the CellList to the data provider in the database. ContactDatabase.get().addDataDisplay(cellList); pagerPanel.setDisplay(cellList); rangeLabelPager.setDisplay(cellList); reloadButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { ContactDatabase.get().loadContacts(); } }); final CreateDialog createDialog = new CreateDialog(); createButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { createDialog.showNew(); } }); ContactDatabase.get().loadContacts(); return widget; } static class CreateDialog extends DialogBox { private final TextBox tbName = new TextBox(); private final Label errorLabel = new Label(); public void showNew() { tbName.setText(""); errorLabel.setText(""); center(); tbName.setFocus(true); } public CreateDialog() { super(); setText("Create new Contact"); setAnimationEnabled(true); VerticalPanel dialogVPanel = new VerticalPanel(); dialogVPanel.add(tbName); errorLabel.setStyleName("error"); dialogVPanel.add(errorLabel); HorizontalPanel buttons = new HorizontalPanel(); final Button addButton = new Button("Add"); buttons.add(addButton); final Button closeButton = new Button("Cancel"); buttons.add(closeButton); dialogVPanel.add(buttons); closeButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { hide(); } }); addButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { // errorLabel.setText("Too short!"); long id = Random.nextInt(10000000); HumanCommands.RegisterHuman cmd = new HumanCommands.RegisterHuman(id, tbName.getText(), "asdasd"); CommandSender.get().Execute(cmd, new AsyncCallback<Void>() { @Override public void onSuccess(Void result) { hide(); } @Override public void onFailure(Throwable caught) { errorLabel.setText(caught.getMessage()); } }); } }); setWidget(dialogVPanel); } } }