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 com.google.gwt.sample.showcase.client.content.cell; import com.google.gwt.cell.client.CheckboxCell; import com.google.gwt.cell.client.EditTextCell; import com.google.gwt.cell.client.FieldUpdater; import com.google.gwt.cell.client.SelectionCell; import com.google.gwt.cell.client.TextCell; import com.google.gwt.core.client.GWT; import com.google.gwt.core.client.RunAsyncCallback; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.i18n.client.Constants; import com.google.gwt.safehtml.shared.SafeHtmlUtils; import com.google.gwt.sample.showcase.client.ContentWidget; import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseData; import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseRaw; import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseSource; import com.google.gwt.sample.showcase.client.content.cell.ContactDatabase.Category; import com.google.gwt.sample.showcase.client.content.cell.ContactDatabase.ContactInfo; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.cellview.client.CellTable; import com.google.gwt.user.cellview.client.Column; import com.google.gwt.user.cellview.client.ColumnSortEvent.ListHandler; import com.google.gwt.user.cellview.client.SimplePager; import com.google.gwt.user.cellview.client.SimplePager.TextLocation; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Widget; import com.google.gwt.view.client.DefaultSelectionEventManager; import com.google.gwt.view.client.MultiSelectionModel; import com.google.gwt.view.client.SelectionModel; import java.util.ArrayList; import java.util.Comparator; import java.util.List; /** * Example file. */ @ShowcaseRaw({ "ContactDatabase.java", "CwCellTable.ui.xml" }) public class CwCellTable extends ContentWidget { /** * The UiBinder interface used by this example. */ @ShowcaseSource interface Binder extends UiBinder<Widget, CwCellTable> { } /** * The constants used in this Content Widget. */ @ShowcaseSource public static interface CwConstants extends Constants { String cwCellTableColumnAddress(); String cwCellTableColumnCategory(); String cwCellTableColumnFirstName(); String cwCellTableColumnLastName(); String cwCellTableDescription(); String cwCellTableName(); } /** * The main CellTable. */ @ShowcaseData @UiField(provided = true) CellTable<ContactInfo> cellTable; /** * The pager used to change the range of data. */ @ShowcaseData @UiField(provided = true) SimplePager pager; /** * An instance of the constants. */ @ShowcaseData private final CwConstants constants; /** * Constructor. * * @param constants the constants */ public CwCellTable(CwConstants constants) { super(constants.cwCellTableName(), constants.cwCellTableDescription(), false, "ContactDatabase.java", "CwCellTable.ui.xml"); this.constants = constants; } @Override public boolean hasMargins() { return false; } /** * Initialize this example. */ @ShowcaseSource @Override public Widget onInitialize() { // Create a CellTable. // 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. cellTable = new CellTable<ContactInfo>(ContactDatabase.ContactInfo.KEY_PROVIDER); cellTable.setWidth("100%", true); // Attach a column sort handler to the ListDataProvider to sort the list. ListHandler<ContactInfo> sortHandler = new ListHandler<ContactInfo>( ContactDatabase.get().getDataProvider().getList()); cellTable.addColumnSortHandler(sortHandler); // Create a Pager to control the table. SimplePager.Resources pagerResources = GWT.create(SimplePager.Resources.class); pager = new SimplePager(TextLocation.CENTER, pagerResources, false, 0, true); pager.setDisplay(cellTable); // Add a selection model so we can select cells. final SelectionModel<ContactInfo> selectionModel = new MultiSelectionModel<ContactInfo>( ContactDatabase.ContactInfo.KEY_PROVIDER); cellTable.setSelectionModel(selectionModel, DefaultSelectionEventManager.<ContactInfo>createCheckboxManager()); // Initialize the columns. initTableColumns(selectionModel, sortHandler); // Add the CellList to the adapter in the database. ContactDatabase.get().addDataDisplay(cellTable); // Create the UiBinder. Binder uiBinder = GWT.create(Binder.class); Widget widget = uiBinder.createAndBindUi(this); return widget; } @Override protected void asyncOnInitialize(final AsyncCallback<Widget> callback) { GWT.runAsync(CwCellTable.class, new RunAsyncCallback() { public void onFailure(Throwable caught) { callback.onFailure(caught); } public void onSuccess() { callback.onSuccess(onInitialize()); } }); } /** * Add the columns to the table. */ @ShowcaseSource private void initTableColumns(final SelectionModel<ContactInfo> selectionModel, ListHandler<ContactInfo> sortHandler) { // Checkbox column. This table will uses a checkbox column for selection. // Alternatively, you can call cellTable.setSelectionEnabled(true) to enable // mouse selection. Column<ContactInfo, Boolean> checkColumn = new Column<ContactInfo, Boolean>(new CheckboxCell(true, false)) { @Override public Boolean getValue(ContactInfo object) { // Get the value from the selection model. return selectionModel.isSelected(object); } }; cellTable.addColumn(checkColumn, SafeHtmlUtils.fromSafeConstant("<br/>")); cellTable.setColumnWidth(checkColumn, 40, Unit.PX); // First name. Column<ContactInfo, String> firstNameColumn = new Column<ContactInfo, String>(new EditTextCell()) { @Override public String getValue(ContactInfo object) { return object.getFirstName(); } }; firstNameColumn.setSortable(true); sortHandler.setComparator(firstNameColumn, new Comparator<ContactInfo>() { public int compare(ContactInfo o1, ContactInfo o2) { return o1.getFirstName().compareTo(o2.getFirstName()); } }); cellTable.addColumn(firstNameColumn, constants.cwCellTableColumnFirstName()); firstNameColumn.setFieldUpdater(new FieldUpdater<ContactInfo, String>() { public void update(int index, ContactInfo object, String value) { // Called when the user changes the value. object.setFirstName(value); ContactDatabase.get().refreshDisplays(); } }); cellTable.setColumnWidth(firstNameColumn, 20, Unit.PCT); // Last name. Column<ContactInfo, String> lastNameColumn = new Column<ContactInfo, String>(new EditTextCell()) { @Override public String getValue(ContactInfo object) { return object.getLastName(); } }; lastNameColumn.setSortable(true); sortHandler.setComparator(lastNameColumn, new Comparator<ContactInfo>() { public int compare(ContactInfo o1, ContactInfo o2) { return o1.getLastName().compareTo(o2.getLastName()); } }); cellTable.addColumn(lastNameColumn, constants.cwCellTableColumnLastName()); lastNameColumn.setFieldUpdater(new FieldUpdater<ContactInfo, String>() { public void update(int index, ContactInfo object, String value) { // Called when the user changes the value. object.setLastName(value); ContactDatabase.get().refreshDisplays(); } }); cellTable.setColumnWidth(lastNameColumn, 20, Unit.PCT); // Category. final Category[] categories = ContactDatabase.get().queryCategories(); List<String> categoryNames = new ArrayList<String>(); for (Category category : categories) { categoryNames.add(category.getDisplayName()); } SelectionCell categoryCell = new SelectionCell(categoryNames); Column<ContactInfo, String> categoryColumn = new Column<ContactInfo, String>(categoryCell) { @Override public String getValue(ContactInfo object) { return object.getCategory().getDisplayName(); } }; cellTable.addColumn(categoryColumn, constants.cwCellTableColumnCategory()); categoryColumn.setFieldUpdater(new FieldUpdater<ContactInfo, String>() { public void update(int index, ContactInfo object, String value) { for (Category category : categories) { if (category.getDisplayName().equals(value)) { object.setCategory(category); } } ContactDatabase.get().refreshDisplays(); } }); cellTable.setColumnWidth(categoryColumn, 130, Unit.PX); // Address. Column<ContactInfo, String> addressColumn = new Column<ContactInfo, String>(new TextCell()) { @Override public String getValue(ContactInfo object) { return object.getAddress(); } }; addressColumn.setSortable(true); addressColumn.setDefaultSortAscending(false); sortHandler.setComparator(addressColumn, new Comparator<ContactInfo>() { public int compare(ContactInfo o1, ContactInfo o2) { return o1.getAddress().compareTo(o2.getAddress()); } }); cellTable.addColumn(addressColumn, constants.cwCellTableColumnAddress()); cellTable.setColumnWidth(addressColumn, 60, Unit.PCT); } }