Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/AbstractUIProvider.java @ 41:87a44f8e25cc

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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>
date Wed, 16 Mar 2011 09:57:41 +0000
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children a2923d63f530
rev   line source
41
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
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17
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18 /**
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19 * An abstract UIProvider that provides some basic methods.
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20 *
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21 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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22 */
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23 public abstract class AbstractUIProvider
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24 implements UIProvider, HasStepForwardHandlers, ClickHandler
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25 {
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26 /** The StepForwardHandlers.*/
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27 protected List<StepForwardHandler> forwardHandlers;
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28
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29
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30 /**
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31 * Creates a new UIProvider instance of this class.
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32 */
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33 public AbstractUIProvider() {
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34 forwardHandlers = new ArrayList<StepForwardHandler>();
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35 }
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36
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37
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38 /**
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39 * Appends a StepForwardHandler that wants to listen to StepForwardEvents.
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40 *
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41 * @param handler A new StepForwardHandler.
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42 */
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43 public void addStepForwardHandler(StepForwardHandler handler) {
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44 if (handler != null) {
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45 forwardHandlers.add(handler);
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46 }
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47 }
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48
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49
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50 /**
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51 * This method is called after the user has clicked on the 'next' button to
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52 * step to the next state.
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53 *
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54 * @param e The StepForwardEvent.
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55 */
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56 protected void fireStepForwardEvent(StepForwardEvent e) {
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57 GWT.log("AbstractUIProvider - fireStepForwardEvent() handlers: " + forwardHandlers.size());
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58 for (StepForwardHandler handler: forwardHandlers) {
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59 handler.onStepForward(e);
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60 }
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61 }
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62
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63
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64 /**
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65 * This method is used to listen to click events on the 'next' button. The
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66 * fireStepForwardEvent() method is called here.
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67 *
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68 * @param e The click event.
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69 */
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70 public void onClick(ClickEvent e) {
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71 Data[] data = getData();
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72
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73 fireStepForwardEvent(new StepForwardEvent(data));
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74 }
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75
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76
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77 /**
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78 * This method needs to be implemented by concrete subclasses. It should
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79 * create a new Canvas object with a representation of <i>data</i>.
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80 *
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81 * @param data The data that should be displayed.
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82 *
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83 * @return a Canvas object that displays <i>data</i>.
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84 */
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85 public abstract Canvas create(Data data);
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86
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87
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88 /**
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89 * This method needs to be implemented by concrete subclasses. It should
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90 * return the selected data.
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91 *
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92 * @return the selected data.
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93 */
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94 protected abstract Data[] getData();
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95 }
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96 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org