Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/client/ui/AbstractUIProvider.java @ 41:87a44f8e25cc
Added a new widget that enables the user to enter a location or a distance in a single step.
flys-client/trunk@1482 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 16 Mar 2011 09:57:41 +0000 |
parents | |
children | a2923d63f530 |
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package de.intevation.flys.client.client.ui; import java.util.ArrayList; import java.util.List; import com.google.gwt.core.client.GWT; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.events.ClickEvent; import com.smartgwt.client.widgets.events.ClickHandler; import de.intevation.flys.client.client.event.HasStepForwardHandlers; import de.intevation.flys.client.client.event.StepForwardEvent; import de.intevation.flys.client.client.event.StepForwardHandler; import de.intevation.flys.client.shared.model.Data; /** * An abstract UIProvider that provides some basic methods. * * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public abstract class AbstractUIProvider implements UIProvider, HasStepForwardHandlers, ClickHandler { /** The StepForwardHandlers.*/ protected List<StepForwardHandler> forwardHandlers; /** * Creates a new UIProvider instance of this class. */ public AbstractUIProvider() { forwardHandlers = new ArrayList<StepForwardHandler>(); } /** * Appends a StepForwardHandler that wants to listen to StepForwardEvents. * * @param handler A new StepForwardHandler. */ public void addStepForwardHandler(StepForwardHandler handler) { if (handler != null) { forwardHandlers.add(handler); } } /** * This method is called after the user has clicked on the 'next' button to * step to the next state. * * @param e The StepForwardEvent. */ protected void fireStepForwardEvent(StepForwardEvent e) { GWT.log("AbstractUIProvider - fireStepForwardEvent() handlers: " + forwardHandlers.size()); for (StepForwardHandler handler: forwardHandlers) { handler.onStepForward(e); } } /** * This method is used to listen to click events on the 'next' button. The * fireStepForwardEvent() method is called here. * * @param e The click event. */ public void onClick(ClickEvent e) { Data[] data = getData(); fireStepForwardEvent(new StepForwardEvent(data)); } /** * This method needs to be implemented by concrete subclasses. It should * create a new Canvas object with a representation of <i>data</i>. * * @param data The data that should be displayed. * * @return a Canvas object that displays <i>data</i>. */ public abstract Canvas create(Data data); /** * This method needs to be implemented by concrete subclasses. It should * return the selected data. * * @return the selected data. */ protected abstract Data[] getData(); } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :