Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) * * This library 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 library 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. * * For further information about Alkacon Software, please see the * company website: http://www.alkacon.com * * For further information about OpenCms, please see the * project website: http://www.opencms.org * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package org.opencms.gwt.client.ui.contextmenu; import org.opencms.gwt.client.Messages; import org.opencms.gwt.client.ui.CmsLoadingAnimation; import org.opencms.gwt.client.ui.CmsMenuButton; import org.opencms.gwt.client.ui.I_CmsButton; import org.opencms.gwt.client.ui.I_CmsButton.ButtonStyle; import org.opencms.gwt.client.ui.css.I_CmsLayoutBundle; import org.opencms.gwt.client.ui.input.CmsLabel; import org.opencms.gwt.client.util.CmsClientCollectionUtil; import org.opencms.gwt.shared.CmsCoreData.AdeContext; import org.opencms.util.CmsUUID; import java.util.List; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.logical.shared.CloseEvent; import com.google.gwt.event.logical.shared.CloseHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.PopupPanel; /** * The result item context menu button.<p> */ public class CmsContextMenuButton extends CmsMenuButton { /** The menu data. */ protected List<I_CmsContextMenuEntry> m_menuEntries; /** The loading panel. */ private CmsLoadingAnimation m_loadingPanel; /** The context menu. */ private CmsContextMenu m_menu; /** The registration for the first close handler. */ private HandlerRegistration m_menuCloseHandler; /** The main content widget. */ private FlexTable m_menuPanel; /** The label which is displayed when no entries are found. */ private CmsLabel m_noEntriesLabel; /** The registration for the second close handler. */ private HandlerRegistration m_popupCloseHandler; /** * Constructor.<p> * * @param structureId the resource structure id * @param handler the context menu handler */ public CmsContextMenuButton(final CmsUUID structureId, final CmsContextMenuHandler handler) { super(null, I_CmsButton.CONTEXT_MENU_SMALL); m_button.setSize(I_CmsButton.Size.medium); setTitle(Messages.get().key(Messages.GUI_TOOLBAR_CONTEXT_0)); m_noEntriesLabel = new CmsLabel(Messages.get().key(Messages.GUI_TOOLBAR_CONTEXT_EMPTY_0)); m_noEntriesLabel.addStyleName(I_CmsLayoutBundle.INSTANCE.contextmenuCss().menuInfoLabel()); m_noEntriesLabel.addStyleName(I_CmsLayoutBundle.INSTANCE.generalCss().buttonCornerAll()); m_loadingPanel = new CmsLoadingAnimation(); // create the menu panel (it's a table because of ie6) m_menuPanel = new FlexTable(); // set a style name for the menu table m_menuPanel.getElement().addClassName(I_CmsLayoutBundle.INSTANCE.contextmenuCss().menuPanel()); m_button.setButtonStyle(ButtonStyle.TRANSPARENT, null); // set the widget setMenuWidget(m_menuPanel); // clear the width of the popup content getPopup().setWidth(0); getPopup().addStyleName(I_CmsLayoutBundle.INSTANCE.dialogCss().contextMenu()); setToolbarMode(false); getPopup().addAutoHidePartner(getElement()); getPopup().addCloseHandler(new CloseHandler<PopupPanel>() { public void onClose(CloseEvent<PopupPanel> event) { getParent().removeStyleName(I_CmsLayoutBundle.INSTANCE.listItemWidgetCss().permaVisible()); } }); addClickHandler(new ClickHandler() { /** * @see com.google.gwt.event.dom.client.ClickHandler#onClick(com.google.gwt.event.dom.client.ClickEvent) */ public void onClick(ClickEvent event) { if (!isOpen()) { openMenu(); getParent().addStyleName(I_CmsLayoutBundle.INSTANCE.listItemWidgetCss().permaVisible()); handler.loadContextMenu(structureId, AdeContext.containerpage, CmsContextMenuButton.this); } else { hideMenu(); } } }); } /** * @see org.opencms.gwt.client.ui.CmsMenuButton#openMenu() */ @Override public void openMenu() { if (m_menu == null) { m_menuPanel.setWidget(0, 0, m_loadingPanel); } super.openMenu(); } /** * Creates the menu and adds it to the panel.<p> * * @param menuEntries the menu entries */ public void showMenu(List<I_CmsContextMenuEntry> menuEntries) { if (!CmsClientCollectionUtil.isEmptyOrNull(menuEntries)) { // if there were entries found for the menu, create the menu m_menu = new CmsContextMenu(menuEntries, true, getPopup()); // add the resize handler for the menu m_resizeRegistration = Window.addResizeHandler(m_menu); // set the menu as widget for the panel m_menuPanel.setWidget(0, 0, m_menu); if (m_menuCloseHandler != null) { m_menuCloseHandler.removeHandler(); } if (m_popupCloseHandler != null) { m_popupCloseHandler.removeHandler(); } // add the close handler for the menu m_menuCloseHandler = getPopup().addCloseHandler(new CmsContextMenuCloseHandler(m_menu)); m_popupCloseHandler = getPopup().addCloseHandler(new CloseHandler<PopupPanel>() { public void onClose(CloseEvent<PopupPanel> event) { closeMenu(); } }); m_popup.position(); } else { m_menuPanel.setWidget(0, 0, m_noEntriesLabel); m_popup.position(); } } /** * @see org.opencms.gwt.client.ui.CmsMenuButton#hideMenu() * * Needed to increase visibility.<p> */ @Override protected void hideMenu() { super.hideMenu(); } }