Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/AbstractUIProvider.java @ 51:a2923d63f530

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Introduced a data structure DataList to manage to list of Data objects of a single state. flys-client/trunk@1505 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 17 Mar 2011 16:44:51 +0000
parents 87a44f8e25cc
children 246af33f621c
rev   line source
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87a44f8e25cc Added a new widget that enables the user to enter a location or a distance in a single step.
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1 package de.intevation.flys.client.client.ui;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import com.google.gwt.core.client.GWT;
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7
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8 import com.smartgwt.client.widgets.Canvas;
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9 import com.smartgwt.client.widgets.events.ClickEvent;
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10 import com.smartgwt.client.widgets.events.ClickHandler;
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11
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12 import de.intevation.flys.client.client.event.HasStepForwardHandlers;
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13 import de.intevation.flys.client.client.event.StepForwardEvent;
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14 import de.intevation.flys.client.client.event.StepForwardHandler;
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15 import de.intevation.flys.client.shared.model.Data;
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16 import de.intevation.flys.client.shared.model.DataList;
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19 /**
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20 * An abstract UIProvider that provides some basic methods.
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21 *
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22 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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23 */
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24 public abstract class AbstractUIProvider
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25 implements UIProvider, HasStepForwardHandlers, ClickHandler
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26 {
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27 /** The StepForwardHandlers.*/
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28 protected List<StepForwardHandler> forwardHandlers;
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29
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30
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31 /**
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32 * Creates a new UIProvider instance of this class.
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33 */
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34 public AbstractUIProvider() {
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35 forwardHandlers = new ArrayList<StepForwardHandler>();
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36 }
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39 /**
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40 * Appends a StepForwardHandler that wants to listen to StepForwardEvents.
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41 *
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42 * @param handler A new StepForwardHandler.
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43 */
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44 public void addStepForwardHandler(StepForwardHandler handler) {
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45 if (handler != null) {
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46 forwardHandlers.add(handler);
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47 }
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48 }
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51 /**
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52 * This method is called after the user has clicked on the 'next' button to
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53 * step to the next state.
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54 *
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55 * @param e The StepForwardEvent.
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56 */
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57 protected void fireStepForwardEvent(StepForwardEvent e) {
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58 GWT.log("AbstractUIProvider - fireStepForwardEvent() handlers: " + forwardHandlers.size());
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59 for (StepForwardHandler handler: forwardHandlers) {
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60 handler.onStepForward(e);
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61 }
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62 }
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64
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65 /**
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66 * This method is used to listen to click events on the 'next' button. The
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67 * fireStepForwardEvent() method is called here.
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68 *
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69 * @param e The click event.
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70 */
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71 public void onClick(ClickEvent e) {
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72 Data[] data = getData();
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73
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74 fireStepForwardEvent(new StepForwardEvent(data));
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75 }
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78 /**
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79 * This method needs to be implemented by concrete subclasses. It should
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80 * create a new Canvas object with a representation of <i>data</i>.
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81 *
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82 * @param data The data that should be displayed.
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83 *
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84 * @return a Canvas object that displays <i>data</i>.
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85 */
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86 public abstract Canvas create(DataList data);
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87
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88
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89 /**
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90 * This method needs to be implemented by concrete subclasses. It should
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91 * return the selected data.
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92 *
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93 * @return the selected data.
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94 */
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95 protected abstract Data[] getData();
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96 }
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97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org