Java tutorial
/* * OneCMDB, an open source configuration management project. * Copyright 2007, Lokomo Systems AB, and individual contributors * as indicated by the @authors tag. See the copyright.txt in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.onecmdb.ui.gwt.toolkit.client.view.table; import org.onecmdb.ui.gwt.toolkit.client.control.listener.LoadListener; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.ClickListener; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.KeyboardListener; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.Widget; public class CITablePageControlPanel extends Composite implements LoadListener { private Label firstItemNumber = new Label("0"); private Label lastItemNumber = new Label("0"); private Label currentRows = new Label("Loading.."); TextBox search = new TextBox(); private CITablePanel table; private Image nextImage; private Image prevImage; private Image reload; public CITablePageControlPanel(final CITablePanel table) { this.table = table; table.addLoadListener(this); HorizontalPanel root = new HorizontalPanel(); root.setStyleName("onecmdb-table-page-search-panel"); root.setWidth("100%"); HorizontalPanel actions = new HorizontalPanel(); root.add(actions); root.setCellHorizontalAlignment(actions, HorizontalPanel.ALIGN_LEFT); HorizontalPanel paging = new HorizontalPanel(); root.add(paging); root.setCellHorizontalAlignment(paging, HorizontalPanel.ALIGN_RIGHT); reload = new Image("images/reload.gif"); reload.addClickListener(getSearchClickListener()); // Enable 'return key' to start search. search.addKeyboardListener(new KeyboardListener() { public void onKeyDown(Widget sender, char keyCode, int modifiers) { } public void onKeyPress(Widget sender, char keyCode, int modifiers) { if (keyCode == KeyboardListener.KEY_ENTER) { getSearchClickListener().onClick(sender); } } public void onKeyUp(Widget sender, char keyCode, int modifiers) { } }); prevImage = new Image("images/prev.gif"); nextImage = new Image("images/next.gif"); nextImage.addClickListener(new ClickListener() { public void onClick(Widget sender) { setNextPage(); table.reload(); } }); prevImage.addClickListener(new ClickListener() { public void onClick(Widget sender) { setPrevPage(); table.reload(); } }); paging.add(prevImage); paging.add(firstItemNumber); paging.add(new Label("-")); paging.add(lastItemNumber); paging.add(new Label("(")); paging.add(currentRows); paging.add(new Label(")")); paging.add(nextImage); actions.add(new Label("Search")); actions.add(search); actions.add(reload); /* actions.add(new Label("PageSize")); TextBox pageSize = new TextBox(); pageSize.setVisibleLength(2); actions.add(pageSize); */ table.addLoadListener(this); initWidget(root); } private ClickListener getSearchClickListener() { return (new ClickListener() { public void onClick(Widget sender) { table.getTableControl().setSearchText(search.getText()); table.getTableControl().setFirstItem(new Integer(0)); table.reload(); } }); } public void update() { table.getTableControl().getRowCount(new AsyncCallback() { public void onFailure(Throwable caught) { } public void onSuccess(Object result) { if (result instanceof Integer) { int totalItems = ((Integer) result).intValue(); int firstItem = getInt(table.getTableControl().getFirstItem()); int pageSize = getInt(table.getTableControl().getMaxResult()); int lastItem = pageSize + firstItem; if (lastItem >= totalItems) { lastItem = totalItems; enableNext(false); } else { enableNext(true); } if (firstItem <= 0) { enablePrev(false); } else { enablePrev(true); } // Set the labels. currentRows.setText(result.toString()); firstItemNumber.setText("" + ((totalItems > 0) ? (firstItem + 1) : 0)); lastItemNumber.setText("" + lastItem); } } }); } private void enableNext(boolean value) { nextImage.setVisible(value); } private void enablePrev(boolean value) { prevImage.setVisible(value); } public void setNextPage() { int first = getInt(table.getTableControl().getFirstItem()); int next = first + getInt(table.getTableControl().getMaxResult()); table.getTableControl().setFirstItem(new Integer(next)); } public void setPrevPage() { int first = getInt(table.getTableControl().getFirstItem()); int max = getInt(table.getTableControl().getMaxResult()); int prev = first - max; if (prev < 0) { prev = 0; } table.getTableControl().setFirstItem(new Integer(prev)); } private int getInt(Integer integer) { if (integer == null) { return (0); } return (integer.intValue()); } public void onLoadComplete(Object sender) { reload.setUrl("images/reload.gif"); reload.setTitle("Reload"); } public void onLoadFailure(Object sender, Throwable caught) { reload.setUrl("images/reload_error.gif"); reload.setTitle(caught.toString()); } public void onLoadStart(Object sender) { reload.setUrl("images/indicator.gif"); reload.setTitle("Loading...."); update(); } }