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.tree; import org.onecmdb.ui.gwt.toolkit.client.control.tree.ITreeControl; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.Tree; import com.google.gwt.user.client.ui.TreeItem; import com.google.gwt.user.client.ui.TreeListener; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; public class CITreeWidget extends Composite implements TreeListener { protected ITreeControl control; protected Tree tree; private TreeItem currentItem; private QueryCriteriaWidget search; public CITreeWidget(final ITreeControl control) { this.control = control; tree = new Tree(); tree.addTreeListener(this); TreeItem item = new TreeItem("Populating...."); //tree.addItem(item); control.getRootObject(new AsyncCallback() { public void onFailure(Throwable caught) { tree.addItem(new TreeItem(new Label("ERROR: " + caught.getMessage()))); } public void onSuccess(Object result) { tree.clear(); if (control.isHideRoot()) { if (result instanceof Object[]) { Object objects[] = (Object[]) result; for (int i = 0; i < objects.length; i++) { control.getChildren(objects[i], null, new AsyncCallback() { public void onFailure(Throwable caught) { tree.addItem(new TreeItem(new Label("ERROR: " + caught.getMessage()))); } public void onSuccess(Object result) { addRootObject(result); } }); } } else { control.getChildren(result, null, new AsyncCallback() { public void onFailure(Throwable caught) { tree.addItem(new TreeItem(new Label("ERROR: " + caught.getMessage()))); } public void onSuccess(Object result) { addRootObject(result); } }); } } else { addRootObject(result); } } }); VerticalPanel vPanel = new VerticalPanel(); vPanel.setVerticalAlignment(vPanel.ALIGN_TOP); search = new QueryCriteriaWidget(this); vPanel.add(search); vPanel.setCellWidth(search, "100%"); if (!control.showSearch()) { search.setVisible(false); } vPanel.add(tree); vPanel.setCellWidth(tree, "100%"); vPanel.setCellHeight(tree, "100%"); vPanel.setCellVerticalAlignment(tree, VerticalPanel.ALIGN_TOP); initWidget(vPanel); } protected void addRootObject(Object result) { if (result instanceof Object[]) { Object objects[] = (Object[]) result; for (int i = 0; i < objects.length; i++) { TreeItem item = newTreeItem(objects[i], true); //tree.addItem(item); } } else { TreeItem item = newTreeItem(result, true); //tree.addItem(item); } } protected CITreeWidget() { } public ITreeControl getTreeControl() { return (this.control); } public void reload() { if (currentItem == null) { currentItem = tree.getItem(0); } // Reload root. currentItem.setState(false, true); currentItem.setState(true, true); } protected TreeItem newTreeItem(Object data, final boolean root) { Widget w = this.control.getWidget(data); final TreeItem item = new TreeItem(); item.setUserObject(data); item.setWidget(w); // Need to this here since we call the auto open and that // need to have the tree callback setup. if (root) { tree.addItem(item); } this.control.getChildCount(data, new AsyncCallback() { public void onFailure(Throwable caught) { // TODO Auto-generated method stub } public void onSuccess(Object result) { if (result instanceof Integer) { int value = ((Integer) result).intValue(); if (value > 0) { TreeItem countItem = new TreeItem("Populating...."); countItem.setUserObject(result); item.addItem(countItem); // Always open root item. if (root && control.isRootState()) { System.out.println("Default open root Tree Item! '" + item.getUserObject() + "'"); item.setState(true, true); } } } } }); return (item); } public void onTreeItemSelected(TreeItem item) { if (CITreeWidget.this.control.getTreeListener() != null) { CITreeWidget.this.control.getTreeListener().onTreeItemSelected(item); } } public void onTreeItemStateChanged(final TreeItem item) { final long start = System.currentTimeMillis(); if (item.getState()) { if (item.getUserObject() instanceof GroupData) { GroupData gData = (GroupData) item.getUserObject(); updateChildren(item, gData.getUserData(), gData.getFirstItem()); return; } currentItem = item; // Open start populate with entries. this.control.getChildCount(item.getUserObject(), new AsyncCallback() { public void onFailure(Throwable caught) { item.removeItems(); item.addItem(new TreeItem(new Label("ERROR: " + caught.getMessage()))); } public void onSuccess(Object result) { if (result instanceof Integer) { Integer totalCount = (Integer) result; Integer maxResult = CITreeWidget.this.control.getMaxResult(); if (maxResult != null && (totalCount.intValue() > maxResult.intValue())) { // Start adding groups... int groups = totalCount.intValue() / maxResult.intValue(); int rest = totalCount.intValue() % maxResult.intValue(); if (rest > 0) { groups++; } item.removeItems(); for (int i = 0; i < groups; i++) { TreeItem groupItem = new TreeItem(); int start = 1; int stop = maxResult.intValue(); if (i > 0) { start = (i * maxResult.intValue()) + 1; stop = ((i + 1) * maxResult.intValue()); if (stop > totalCount.intValue()) { stop = totalCount.intValue(); } } groupItem.setText("[" + start + ".." + stop + "]"); groupItem .setUserObject(new GroupData(item.getUserObject(), new Integer(start - 1))); groupItem.addItem(new TreeItem("Loading...")); item.addItem(groupItem); } } else { updateChildren(item, item.getUserObject(), null); } } } }); } else { //item.removeItems(); //updateCountItem(item); } if (CITreeWidget.this.control.getTreeListener() != null) { CITreeWidget.this.control.getTreeListener().onTreeItemStateChanged(item); } } protected void updateChildren(final TreeItem item, Object data, final Integer firstItem) { CITreeWidget.this.control.getChildren(data, firstItem, new AsyncCallback() { public void onFailure(Throwable caught) { item.removeItems(); item.addItem(new TreeItem(new Label("ERROR: " + caught.getMessage()))); } public void onSuccess(Object result) { long stopCall = System.currentTimeMillis(); if (result instanceof Object[]) { /* boolean useSearch = false; Integer totalCount = new Integer(0); if (count instanceof Integer) { totalCount = (Integer)count; } if (totalCount.intValue() > control.getMaxResult().intValue()) { showSearch(true); useSearch = true; } */ item.removeItems(); /* if (useSearch) { TreeItem searchItem = new TreeItem(); searchItem.setHTML("<font size=\"xx-small\"><b>NOTE: Showing " + control.getMaxResult() + " of " + totalCount +", use search!</b></font>"); searchItem.setUserObject(totalCount); item.addItem(searchItem); } */ int resultSize = 0; Object children[] = (Object[]) result; resultSize = children.length; for (int i = 0; i < resultSize; i++) { item.addItem(newTreeItem(children[i], false)); } long stopUI = System.currentTimeMillis(); //OneCMDBSession.addCallStat("Tree.getChildren()", resultSize, start, stopCall, stopUI); } } }); } protected void updateCountItem(final TreeItem parent) { this.control.getChildCount(parent.getUserObject(), new AsyncCallback() { public void onFailure(Throwable caught) { // TODO Auto-generated method stub } public void onSuccess(Object result) { if (result instanceof Integer) { int value = ((Integer) result).intValue(); if (value > 0) { TreeItem countItem = new TreeItem("Populating...."); countItem.setUserObject(result); parent.addItem(countItem); } } } }); } protected void showSearch(boolean b) { search.setVisible(true); } class GroupData { private Object data; private Integer firstResult; public GroupData(Object data, Integer firstResult) { this.data = data; this.firstResult = firstResult; } public Object getUserData() { return (this.data); } public Integer getFirstItem() { return (this.firstResult); } } }