Java tutorial
/* ------------------------------------------------------------------------- OpenTripPlanner GWT Client Copyright (C) 2015 Mecatran - info@mecatran.com 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 2 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. ------------------------------------------------------------------------- */ package com.mecatran.otp.gwt.client; import java.util.List; import java.util.Map; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.ScriptInjector; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.Window; 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.RootPanel; import com.google.gwt.user.client.ui.VerticalPanel; import com.mecatran.otp.gwt.client.controller.PlannerController; import com.mecatran.otp.gwt.client.controller.PlannerState; import com.mecatran.otp.gwt.client.i18n.I18nUtils; public class PlannerWidgetEntryPoint implements EntryPoint { private PlannerWidgetConfig config; @Override public void onModuleLoad() { /* Check for config */ config = getConfig(); if (config == null) { Window.alert("Unable to find JS object widget config 'otpPlannerWidgetConfig' in host page."); return; } /* Check for root panel where we want to insert the widget. */ RootPanel mapPanel = RootPanel.get(config.getWidgetDivId()); if (mapPanel == null) { Window.alert("Unable to find <div id='" + config.getWidgetDivId() + "'> in host page."); return; } /* Load javascript libraries. */ ScriptInjector.fromString(PlannerResources.INSTANCE.gwtOpenLayersUtilsJs().getText()) .setWindow(ScriptInjector.TOP_WINDOW).inject(); /* Note: must load OSM after OpenLayers */ ScriptInjector.fromString(PlannerResources.INSTANCE.gwtOpenStreetMapJs().getText()) .setWindow(ScriptInjector.TOP_WINDOW).inject(); PlannerResources.INSTANCE.css().ensureInjected(); mapPanel.clear(); /* Create a controller and get it's widget onto the root panel */ PlannerController controller = new PlannerController(getConfig()); mapPanel.add(controller.getPlannerWidget()); /* If parameters where provided, try to restore state */ Map<String, List<String>> parameters = Window.Location.getParameterMap(); if (parameters.size() > 0) { controller.restoreState(new PlannerState(parameters)); } /* Display dialog box if config has set a message. */ showIntroDialogBox(); } private void showIntroDialogBox() { if (config.getIntroMessage() == null) return; final DialogBox dialogBox = new DialogBox(true, true); VerticalPanel dialogBoxContents = new VerticalPanel(); dialogBox.setText(I18nUtils.tr("welcome")); HTML message = new HTML(config.getIntroMessage()); Button button = new Button(I18nUtils.tr("ok"), new ClickHandler() { @Override public void onClick(ClickEvent event) { dialogBox.hide(); } }); dialogBox.setWidth("400px"); dialogBoxContents.add(message); dialogBoxContents.add(button); dialogBox.setWidget(dialogBoxContents); dialogBox.center(); } private native PlannerWidgetConfig getConfig() /*-{ return $wnd.otpPlannerWidgetConfig; }-*/; }