Java tutorial
/* * Copyright 2010 Daniel Kurka * * 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.googlecode.mgwt.ui.client.widget.tabbar; import com.google.gwt.core.shared.GWT; 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.uibinder.client.UiChild; import com.google.gwt.uibinder.client.UiFactory; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.Widget; import com.googlecode.mgwt.dom.client.event.tap.TapEvent; import com.googlecode.mgwt.dom.client.event.tap.TapHandler; import com.googlecode.mgwt.ui.client.util.HandlerRegistrationConverter; import com.googlecode.mgwt.ui.client.widget.carousel.Carousel; import com.googlecode.mgwt.ui.client.widget.panel.flex.FlexPanel; import java.util.ArrayList; import java.util.List; /** * * * At the moment theres no support for custom parsers: * http://code.google.com/p/google-web-toolkit/issues/detail?id=4461 * * So if you want to use TabPanel in UIBinder its a bit choppy: * * <pre> * <mgwt:TabPanel> * <mgwt:tabs> * <mgwt:Tab> * <mgwt:button> * <mgwt:DownloadsTabBarButton></mgwt:DownloadsTabBarButton> * </mgwt:button> * <mgwt:widget> * <!-- content for that tab --> * </mgwt:widget> * </mgwt:Tab> * </mgwt:tabs> * </mgwt:TabPanel> * </pre> * * @author Daniel Kurka */ public class TabPanel extends Composite implements HasSelectionHandlers<Integer> { public static class TabBar extends Composite implements HasSelectionHandlers<Integer> { private class InternalTouchHandler implements TapHandler { private final TabBarButtonBase button; public InternalTouchHandler(TabBarButtonBase button) { this.button = button; } @Override public void onTap(TapEvent event) { setSelectedButton(getIndexForWidget(button)); } } @UiField public FlowPanel container; private List<TabBarButtonBase> children = new ArrayList<TabBarButtonBase>();; private List<HandlerRegistration> handlers = new ArrayList<HandlerRegistration>(); public TabBar() { this(DEFAULT_APPEARANCE); } public TabBar(TabBarAppearance appearance) { initWidget(appearance.barBinder().createAndBindUi(this)); } public void add(TabBarButtonBase w) { if (children.size() == 0) { w.setSelected(true); } container.add(w); children.add(w); handlers.add(w.addTapHandler(new InternalTouchHandler(w))); } public void clear() { container.clear(); children.clear(); handlers.clear(); } int getIndexForWidget(TabBarButtonBase w) { return children.indexOf(w); } public boolean remove(TabBarButtonBase w) { int indexForWidget = getIndexForWidget(w); children.remove(w); if (indexForWidget != -1) { handlers.get(indexForWidget).removeHandler(); handlers.remove(indexForWidget); } return container.remove(w); } public void setSelectedButton(int index) { setSelectedButton(index, true); } public void setSelectedButton(int index, boolean issueEvent) { if (index < 0 || index >= children.size()) { throw new IllegalArgumentException("invalid index"); } int count = 0; for (TabBarButtonBase button : children) { if (count == index) { button.setSelected(true); } else { button.setSelected(false); } count++; } if (issueEvent) { SelectionEvent.fire(this, Integer.valueOf(index)); } } @Override public com.google.gwt.event.shared.HandlerRegistration addSelectionHandler( SelectionHandler<Integer> handler) { return addHandler(handler, SelectionEvent.getType()); } public void remove(int index) { TabBarButtonBase w = getWidgetForIndex(index); remove(w); } private TabBarButtonBase getWidgetForIndex(int index) { return children.get(index); } } public static final TabBarAppearance DEFAULT_APPEARANCE = GWT.create(TabBarAppearance.class); @UiField public FlexPanel container; @UiField(provided = true) public Carousel tabContainer; @UiField(provided = true) public TabBar tabBar; protected final TabBarAppearance appearance; public TabPanel() { this(DEFAULT_APPEARANCE); } public TabPanel(TabBarAppearance appearance) { this.appearance = appearance; tabContainer = new Carousel(); tabContainer.setShowCarouselIndicator(false); tabBar = new TabBar(appearance); initWidget(appearance.panelBinder().createAndBindUi(this)); tabBar.addSelectionHandler(new SelectionHandler<Integer>() { @Override public void onSelection(SelectionEvent<Integer> event) { tabContainer.setSelectedPage(event.getSelectedItem(), false); } }); tabContainer.addSelectionHandler(new SelectionHandler<Integer>() { @Override public void onSelection(SelectionEvent<Integer> event) { tabBar.setSelectedButton(event.getSelectedItem(), false); } }); } public void setSelectedChild(int index) { tabBar.setSelectedButton(index, true); tabContainer.setSelectedPage(index); } public void add(TabBarButtonBase button, Widget child) { tabContainer.add(child); tabBar.add(button); } /** * at the moment there is no support for custom parsers: * http://code.google.com/p/google-web-toolkit/issues/detail?id=4461 this is a workaround to allow * use with UIBinder * * {@link TabPanel#add(TabBarButtonBase, Widget)} if you are writing java code * * @param b the tab to add */ @UiChild(tagname = "tabs") public void addTab(Tab b) { Widget w = b.getWidget(); TabBarButtonBase button = b.getButton(); if (button == null) { throw new IllegalArgumentException("button can not be null"); } if (w == null) { throw new IllegalArgumentException("widget can not be null"); } add(button, w); } @Override public com.google.gwt.event.shared.HandlerRegistration addSelectionHandler(SelectionHandler<Integer> handler) { return new HandlerRegistrationConverter(tabBar.addSelectionHandler(handler)); } @UiFactory public TabBarAppearance getAppearance() { return appearance; } }