Java tutorial
package org.activityinfo.ui.client.page.app; /* * #%L * ActivityInfo Server * %% * Copyright (C) 2009 - 2013 UNICEF * %% * This program 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. * * 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, see * <http://www.gnu.org/licenses/gpl-3.0.html>. * #L% */ import com.extjs.gxt.ui.client.event.Listener; import com.extjs.gxt.ui.client.widget.MessageBox; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.DivElement; import com.google.gwt.dom.client.SpanElement; import com.google.gwt.dom.client.Style.Display; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.http.client.*; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.uibinder.client.UiHandler; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.PopupPanel; import com.google.gwt.user.client.ui.Widget; import org.activityinfo.i18n.shared.I18N; import org.activityinfo.legacy.shared.Log; import org.activityinfo.ui.client.ClientContext; import org.activityinfo.ui.client.EventBus; import org.activityinfo.ui.client.SessionUtil; import org.activityinfo.ui.client.inject.ClientSideAuthProvider; import org.activityinfo.ui.client.local.LocalController; import org.activityinfo.ui.client.local.LocalStateChangeEvent; import org.activityinfo.ui.client.local.LocalStateChangeEvent.State; import org.activityinfo.ui.client.local.capability.LocalCapabilityProfile; import org.activityinfo.ui.client.local.sync.SyncCompleteEvent; import org.activityinfo.ui.client.local.sync.SyncStatusEvent; import org.activityinfo.ui.client.page.NavigationEvent; import org.activityinfo.ui.client.page.NavigationHandler; import java.util.Date; public class SettingsPopup extends PopupPanel { public static final int WIDTH = 250; private static SettingsPopupUiBinder uiBinder = GWT.create(SettingsPopupUiBinder.class); interface SettingsPopupUiBinder extends UiBinder<Widget, SettingsPopup> { } @UiField SpanElement versionLabel; @UiField SpanElement emailLabel; @UiField SpanElement versionStatus; @UiField SpanElement appCacheStatus; @UiField Label refreshLink; @UiField Label logoutLink; @UiField Label userProfileLink; @UiField Label offlineInstallLabel; @UiField Label offlineStatusLabel; @UiField Label lastSyncedLabel; Date lastSyncTime = null; @UiField DivElement syncRow; @UiField Label syncNowLabel; private boolean syncing = false; private EventBus eventBus; private LocalStateChangeEvent.State state = State.CHECKING; private LocalController offlineController; private LocalCapabilityProfile offlineCapabilityProfile = GWT.create(LocalCapabilityProfile.class); public SettingsPopup(EventBus eventBus, LocalController offlineController) { this.eventBus = eventBus; this.offlineController = offlineController; setWidget(uiBinder.createAndBindUi(this)); setAutoHideEnabled(true); setAutoHideOnHistoryEventsEnabled(true); setWidth(WIDTH + "px"); versionLabel.setInnerText(ClientContext.getVersion()); emailLabel.setInnerText(new ClientSideAuthProvider().get().getEmail()); syncRow.getStyle().setDisplay(Display.NONE); eventBus.addListener(SyncStatusEvent.TYPE, new Listener<SyncStatusEvent>() { @Override public void handleEvent(SyncStatusEvent be) { offlineStatusLabel.setText(be.getTask() + " " + ((int) (be.getPercentComplete())) + "%"); syncing = true; } }); eventBus.addListener(SyncCompleteEvent.TYPE, new Listener<SyncCompleteEvent>() { @Override public void handleEvent(SyncCompleteEvent event) { syncing = false; syncRow.getStyle().setDisplay(Display.BLOCK); lastSyncTime = event.getTime(); updateLastSyncLabel(); } }); eventBus.addListener(LocalStateChangeEvent.TYPE, new Listener<LocalStateChangeEvent>() { @Override public void handleEvent(LocalStateChangeEvent be) { onOfflineStatusChange(be.getState()); } }); onOfflineStatusChange(offlineController.getState()); } @Override public void show() { sendUpdateRequest(); updateLastSyncLabel(); if (!syncing) { offlineStatusLabel.setText(""); } super.show(); } /** * Queries the server for the latest deployed version. */ private void sendUpdateRequest() { versionStatus.setInnerText(I18N.CONSTANTS.versionChecking()); appCacheStatus.setInnerText(""); refreshLink.setVisible(false); RequestBuilder request = new RequestBuilder(RequestBuilder.GET, "/commit.id"); request.setCallback(new RequestCallback() { @Override public void onResponseReceived(Request request, Response response) { if (response.getStatusCode() != 200) { versionStatus.setInnerText(I18N.CONSTANTS.versionConnectionProblem()); } else if (response.getText().startsWith(ClientContext.getCommitId())) { versionStatus.setInnerText(I18N.CONSTANTS.versionLatest()); } else { versionStatus.setInnerText(I18N.CONSTANTS.versionUpdateAvailable()); refreshLink.setVisible(true); } } @Override public void onError(Request request, Throwable exception) { versionStatus.setInnerText(I18N.CONSTANTS.versionConnectionProblem()); } }); try { request.send(); } catch (RequestException e) { versionStatus.setInnerText(I18N.CONSTANTS.versionConnectionProblem()); Log.debug("Problem fetching latest version", e); } } @UiHandler("refreshLink") public void onRefreshLink(ClickEvent e) { } @UiHandler("logoutLink") public void onLogoutClicked(ClickEvent e) { SessionUtil.logout(); } @UiHandler("userProfileLink") public void onUserProfileLink(ClickEvent e) { eventBus.fireEvent( new NavigationEvent(NavigationHandler.NAVIGATION_REQUESTED, new UserProfilePage.State())); super.hide(); } @UiHandler("offlineInstallLabel") public void onOfflineInstallClicked(ClickEvent e) { switch (state) { case UNINSTALLED: if (offlineCapabilityProfile.isOfflineModeSupported()) { offlineController.install(); } else { MessageBox.info("Offline Mode not supported", offlineCapabilityProfile.getInstallInstructions(), null); } } } @UiHandler("syncNowLabel") public void onSyncNowClicked(ClickEvent e) { offlineController.synchronize(); } private void onOfflineStatusChange(State state) { this.state = state; offlineStatusLabel.setText(""); switch (state) { case UNINSTALLED: offlineInstallLabel.setText(I18N.CONSTANTS.installOffline()); syncRow.getStyle().setDisplay(Display.NONE); break; case INSTALLING: offlineInstallLabel.setText(""); syncRow.getStyle().setDisplay(Display.NONE); break; case INSTALLED: offlineInstallLabel.setText(I18N.CONSTANTS.reinstallOfflineMode()); syncRow.getStyle().setDisplay(Display.BLOCK); lastSyncTime = offlineController.getLastSyncTime(); updateLastSyncLabel(); } } private void updateLastSyncLabel() { if (lastSyncTime != null) { lastSyncedLabel.setText(I18N.MESSAGES.lastSynced(formatLastSyncTime(lastSyncTime))); } } private String formatLastSyncTime(Date time) { long now = new Date().getTime(); long last = time.getTime(); long secondsAgo = (now - last) / 1000; if (secondsAgo <= 60) { return I18N.CONSTANTS.relativeTimeMinAgo(); } long minutesAgo = secondsAgo / 60; if (minutesAgo <= 60) { return I18N.MESSAGES.minutesAgo((int) minutesAgo); } long hoursAgo = minutesAgo / 60; if (hoursAgo <= 48) { return I18N.MESSAGES.hoursAgo((int) hoursAgo); } long daysAgo = hoursAgo / 24; return I18N.MESSAGES.daysAgo((int) daysAgo); } }