Java tutorial
/* * Copyright (c) 2010, 2011 Mashery, Inc. All Rights Reserved. * * 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.mashery.examples.api.client; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ChangeEvent; import com.google.gwt.event.dom.client.ChangeHandler; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.maps.client.base.HasLatLng; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.Grid; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.ListBox; import com.google.gwt.user.client.ui.ScrollPanel; import com.mashery.examples.api.client.weatherbug.Forecast; import com.mashery.examples.api.client.weatherbug.ForecastService; import com.mashery.examples.api.client.weatherbug.ForecastServiceAsync; import com.mashery.examples.api.client.weatherbug.Forecasts; import com.mashery.examples.api.client.weatherbug.LayerType; import com.mashery.examples.api.client.weatherbug.Location; import com.mashery.examples.api.client.weatherbug.Weather; import com.mashery.examples.api.client.weatherbug.WeatherBugOverlayView; public class WeatherBugExample extends Composite { private final PopupMapWidget mapWidget; private final FlexTable table; public WeatherBugExample(final PopupMapWidget mapWidget) { this.mapWidget = mapWidget; FlowPanel panel = new FlowPanel(); panel.add(new HTML("<h1>Weather Forecast</h1>")); Grid controlPanel = new Grid(1, 3); panel.add(controlPanel); Button refreshButton = new Button("Get Weather Forecast", new ClickHandler() { @Override public void onClick(ClickEvent event) { fetchWeather(); } }); controlPanel.setWidget(0, 0, refreshButton); mapWidget.addAutoHidePartner(refreshButton.getElement()); controlPanel.setHTML(0, 1, " Map Overlay:"); final ListBox overlayBox = new ListBox(); controlPanel.setWidget(0, 2, overlayBox); overlayBox.addItem("(none)", ""); for (LayerType layerType : LayerType.values()) overlayBox.addItem(layerType.getDescription(), layerType.toString()); final WeatherBugOverlayView overlay = new WeatherBugOverlayView(); overlayBox.addChangeHandler(new ChangeHandler() { private boolean initialized; private boolean visible = true; @Override public void onChange(ChangeEvent event) { int index = overlayBox.getSelectedIndex(); LayerType layerType = index == 0 ? null : LayerType.valueOf(overlayBox.getValue(index)); if (layerType == null) { if (initialized && visible) { overlay.hide(); visible = false; } } else { overlay.setLayerType(layerType); if (initialized) { if (!visible) { overlay.show(); visible = true; } } else { overlay.setMap(mapWidget.getMap()); initialized = true; } mapWidget.show(); } } }); mapWidget.addAutoHidePartner(overlayBox.getElement()); panel.add(new HTML()); table = new FlexTable(); panel.add(table); table.setCellSpacing(20); ((FlexTable.FlexCellFormatter) table.getCellFormatter()).setColSpan(0, 0, 5); initWidget(new ScrollPanel(panel)); } private void fetchWeather() { table.setText(0, 0, "Loading..."); ForecastServiceAsync svc = GWT.create(ForecastService.class); mapWidget.show(); HasLatLng latLng = mapWidget.getMap().getCenter(); svc.getForecast(latLng.getLatitude(), latLng.getLongitude(), new AsyncCallback<Weather>() { @Override public void onSuccess(Weather weather) { table.setText(0, 0, ""); mapWidget.hide(); Forecasts forecastWrapper = weather.getForecasts(); if (forecastWrapper == null) return; Location location = forecastWrapper.getLocation(); if (location != null) { StringBuilder buf = new StringBuilder("<strong>"); if (location.getCity() != null) buf.append(location.getCity()); if (location.getState() != null) { if (buf.length() > 0) buf.append(", "); buf.append(location.getState()); } if (location.getZip() != null) { if (buf.length() > 0) buf.append(' '); buf.append(location.getZip()); } if (location.getCountry() != null) { if (buf.length() > 0) buf.append(", "); buf.append(location.getCountry()); } table.setHTML(0, 0, buf.append("</strong>").toString()); } Forecast[] forecasts = forecastWrapper.getForecasts(); if (forecasts != null) { for (int i = 0; i < forecasts.length; ++i) { table.setText(i + 1, 0, forecasts[i].getDescription()); table.setWidget(i + 1, 1, new Image(forecasts[i].getImage())); table.setHTML(i + 1, 2, forecasts[i].getPrediction()); table.setHTML(i + 1, 3, forecasts[i].getHigh() + "°F"); table.setHTML(i + 1, 4, forecasts[i].getLow() + "°F"); } } } @Override public void onFailure(Throwable caught) { table.setText(0, 0, ""); mapWidget.hide(); Window.alert(caught.getLocalizedMessage()); } }); } }