Java tutorial
/* * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd. * * This file is part of GSS. * * GSS is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GSS 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 GSS. If not, see <http://www.gnu.org/licenses/>. */ package org.gss_project.gss.web.client; import org.gss_project.gss.web.client.MessagePanel.Images; import org.gss_project.gss.web.client.rest.DeleteCommand; import org.gss_project.gss.web.client.rest.RestException; import org.gss_project.gss.web.client.rest.resource.GroupResource; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.NativeEvent; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.KeyCodes; import com.google.gwt.user.client.DeferredCommand; import com.google.gwt.user.client.Event.NativePreviewEvent; import com.google.gwt.user.client.ui.AbstractImagePrototype; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.DialogBox; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.TreeItem; import com.google.gwt.user.client.ui.VerticalPanel; /** * The 'delete group' dialog box. */ public class DeleteGroupDialog extends DialogBox { /** * The widget's constructor. * @param images the supplied images */ public DeleteGroupDialog(final Images images) { // Use this opportunity to set the dialog's caption. setText("Delete group"); setAnimationEnabled(true); final GroupResource group = (GroupResource) GSS.get().getCurrentSelection(); // Create a VerticalPanel to contain the 'about' label and the 'OK' // button. final VerticalPanel outer = new VerticalPanel(); final HorizontalPanel buttons = new HorizontalPanel(); // Create the 'about' text and set a style name so we can style it with // CSS. final HTML text = new HTML( "<table><tr><td>" + AbstractImagePrototype.create(images.warn()).getHTML() + "</td><td>" + "Are you sure you want to delete group '" + group.getName() + "'?</td></tr></table>"); text.setStyleName("gss-warnMessage"); outer.add(text); // Create the 'Quit' button, along with a listener that hides the dialog // when the button is clicked and quits the application. final Button ok = new Button("OK", new ClickHandler() { @Override public void onClick(ClickEvent event) { deleteGroup(); hide(); } }); ok.getElement().setId("deleteGroup.button.ok"); buttons.add(ok); buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER); // Create the 'Cancel' button, along with a listener that hides the // dialog // when the button is clicked. final Button cancel = new Button("Cancel", new ClickHandler() { @Override public void onClick(ClickEvent event) { hide(); } }); cancel.getElement().setId("deleteGroup.button.cancel"); buttons.add(cancel); buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER); buttons.setSpacing(8); buttons.setStyleName("gss-warnMessage"); outer.setStyleName("gss-warnMessage"); outer.add(buttons); outer.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_CENTER); outer.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER); setWidget(outer); } /** * Generate an RPC request to delete a group. * * @param userId the ID of the current user */ private void deleteGroup() { final TreeItem group = GSS.get().getGroups().getCurrent(); if (group == null) { GSS.get().displayError("No group was selected!"); return; } DeleteCommand dg = new DeleteCommand(((GroupResource) group.getUserObject()).getUri()) { @Override public void onComplete() { GSS.get().getGroups().updateGroups(); } @Override public void onError(Throwable t) { GWT.log("", t); if (t instanceof RestException) { int statusCode = ((RestException) t).getHttpStatusCode(); if (statusCode == 405) GSS.get().displayError("You don't have the necessary permissions"); else if (statusCode == 404) GSS.get().displayError("Group not found"); else GSS.get().displayError("Unable to delete group:" + ((RestException) t).getHttpStatusText()); } else GSS.get().displayError("System error unable to delete group:" + t.getMessage()); } }; DeferredCommand.addCommand(dg); } @Override protected void onPreviewNativeEvent(NativePreviewEvent preview) { super.onPreviewNativeEvent(preview); NativeEvent evt = preview.getNativeEvent(); if (evt.getType().equals("keydown")) // Use the popup's key preview hooks to close the dialog when either // enter or escape is pressed. switch (evt.getKeyCode()) { case KeyCodes.KEY_ENTER: hide(); deleteGroup(); break; case KeyCodes.KEY_ESCAPE: hide(); break; } } }