Java tutorial
/* This file is part of Intake24. Crown copyright, 2012, 2013, 2014. This software is licensed under the Open Government Licence 3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/ */ package net.scran24.user.client.survey.prompts; import net.scran24.common.client.WidgetFactory; import net.scran24.user.client.survey.SurveyStageInterface; import net.scran24.user.client.survey.flat.Prompt; import net.scran24.user.client.survey.flat.Survey; import net.scran24.user.client.survey.flat.SurveyOperation; import net.scran24.user.client.survey.prompts.messages.PromptMessages; import org.workcraft.gwt.shared.client.Callback1; import org.workcraft.gwt.shared.client.Function1; import com.google.gwt.core.shared.GWT; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.safehtml.shared.SafeHtmlUtils; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HasVerticalAlignment; public class EmptySurveyPrompt implements Prompt<Survey, SurveyOperation> { private final PromptMessages messages = GWT.create(PromptMessages.class); @Override public SurveyStageInterface getInterface(final Callback1<SurveyOperation> onComplete, final Callback1<Function1<Survey, Survey>> onIntermediateStateChange) { FlowPanel content = new FlowPanel(); content.add( WidgetFactory.createPromptPanel(SafeHtmlUtils.fromSafeConstant(messages.emptySurvey_promptText()))); Button addMeal = WidgetFactory.createButton(messages.energyValidation_addMealButtonLabel(), new ClickHandler() { @Override public void onClick(ClickEvent event) { onComplete.call(SurveyOperation.addMealRequest(0)); } }); content.add(WidgetFactory.createButtonsPanel(addMeal)); return new SurveyStageInterface.Aligned(content, HasHorizontalAlignment.ALIGN_LEFT, HasVerticalAlignment.ALIGN_TOP, SurveyStageInterface.DEFAULT_OPTIONS); } @Override public String toString() { return "Empty survey"; } }