Java tutorial
/* * ============================================================= * Copyright (C) 2007-2011 Edgenius (http://www.edgenius.com) * ============================================================= * License Information: http://www.edgenius.com/licensing/edgenius/2.0/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2.0 * as published by the Free Software Foundation. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * http://www.gnu.org/licenses/gpl.txt * * **************************************************************** */ package com.edgenius.wiki.gwt.client.widgets; import java.util.HashMap; import java.util.Map; import com.edgenius.wiki.gwt.client.Css; import com.google.gwt.event.logical.shared.BeforeSelectionEvent; import com.google.gwt.event.logical.shared.BeforeSelectionHandler; import com.google.gwt.event.logical.shared.HasBeforeSelectionHandlers; import com.google.gwt.event.logical.shared.HasSelectionHandlers; import com.google.gwt.event.logical.shared.SelectionEvent; import com.google.gwt.event.logical.shared.SelectionHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.ui.DeckPanel; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.SimplePanel; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; /** * @author Dapeng.Ni */ public class URLTabPanel extends SimplePanel implements BeforeSelectionHandler<Integer>, SelectionHandler<Integer>, HasBeforeSelectionHandlers<Integer>, HasSelectionHandlers<Integer> { private int URL_PANEL_INDEX = -1; private URLTabBar tabBar = new URLTabBar(); private DeckPanel deck = new DeckPanel(); private URLPanel urlPanel = new URLPanel(); private Map<Integer, String> urlMap = new HashMap<Integer, String>(); private Map<Integer, Integer> deckMap = new HashMap<Integer, Integer>(); private int selected = -1; private Map<Integer, LazyLoadingPanel> lazy = new HashMap<Integer, LazyLoadingPanel>(); public URLTabPanel() { VerticalPanel panel = new VerticalPanel(); panel.add(tabBar); panel.add(deck); tabBar.addSelectionHandler(this); tabBar.addBeforeSelectionHandler(this); deck.setStyleName(Css.TAB_DECK); panel.setSize("100%", "100%"); this.setStyleName(Css.URL_TAB_PANEL); this.setWidget(panel); } public void clear() { urlMap.clear(); deckMap.clear(); tabBar.clear(); deck.clear(); URL_PANEL_INDEX = -1; selected = -1; } public int addItem(Widget widget, String title, boolean lazyLoading) { return addItem(widget, title, null, lazyLoading); } public int addItem(final String url, String title) { return addItem(url, title, null); } public int addItem(Widget widget, String title, Image titleIcon, boolean lazyLoading) { int tabIdx = tabBar.addTab(title, titleIcon); deck.add(widget); deckMap.put(tabIdx, deck.getWidgetCount() - 1); if (widget instanceof LazyLoadingPanel) lazy.put(tabIdx, (LazyLoadingPanel) widget); return tabIdx; } public int addItem(final String url, String title, Image titleIcon) { int tabIdx = tabBar.addTab(title, titleIcon); urlMap.put(tabIdx, url); return tabIdx; } public void resetTabTitle(int uniqueID, String title, Image titleIcon) { tabBar.resetTabTitle(uniqueID, title, titleIcon); } /** * !!! This method must call after the widget is put into HMTL body. Please refer to * URLPanel.setURL() * * @param uniqueID * @param fireEvent: TODO: */ public void setSelected(int uniqueID, boolean fireEvent) { boolean go = true; if (fireEvent) { BeforeSelectionEvent<Integer> evt = BeforeSelectionEvent.fire(this, uniqueID); go = evt != null ? !evt.isCanceled() : false; } if (go) { tabBar.select(uniqueID); select(uniqueID); if (fireEvent) SelectionEvent.fire(this, uniqueID); } } public HandlerRegistration addBeforeSelectionHandler(BeforeSelectionHandler<Integer> handler) { return this.addHandler(handler, BeforeSelectionEvent.getType()); } public HandlerRegistration addSelectionHandler(SelectionHandler<Integer> handler) { return this.addHandler(handler, SelectionEvent.getType()); } /** * The reason call uniqueID rather than tabIdx is, tabIdx maybe change for each tab if there is * insert etc method. But uniqueID won't. Actually, here uniqueID == tabIdx */ public void onBeforeSelection(BeforeSelectionEvent<Integer> event) { //OK,if choose same tab, do nothing Integer uniqueID = event.getItem(); if (selected == uniqueID) { event.cancel(); return; } BeforeSelectionEvent.fire(this, uniqueID); LazyLoadingPanel lazyPanel = lazy.get(uniqueID); if (lazyPanel != null) { lazyPanel.load(); } } public void onSelection(SelectionEvent<Integer> event) { Integer uniqueID = event.getSelectedItem(); //OK,if choose same tab, do nothing , it is import to improve performance: for example commentPanel.loadComment(); //will load if there are tabPanel select event, if user multiple click same tab, it may load multiple times if (selected == uniqueID) { return; } select(uniqueID); SelectionEvent.fire(this, uniqueID); } public int getSelectedIndex() { return selected; } /** * @param uniqueID */ private void select(int uniqueID) { selected = uniqueID; //have to hide entire deck, as I cannot find a method to hide some widget deck.setVisible(false); if (uniqueID < 0) { return; } //is it URL? String url = urlMap.get(uniqueID); if (url != null) { if (URL_PANEL_INDEX == -1) { //please note, URL panel must be last one of deck otherwise in Chrome or Safari browser, it has a bug: //First go to view some page, then go to space admin from drop down menu, then go back view page, then go to admin again. //After above steps, the admin page can not display correctly, the tab link doesn't response, the general page doesn't show logo and functions etc. deck.add(urlPanel); URL_PANEL_INDEX = deck.getWidgetIndex(urlPanel); } deck.setVisible(true); urlPanel.setURL(url); deck.showWidget(URL_PANEL_INDEX); } else { //OK, should be widget tab, or uniqueID is invalid (-1) Integer deckIdx = deckMap.get(uniqueID); if (deckIdx != null) { deck.setVisible(true); deck.showWidget(deckIdx); } } } }