Java Code Examples for com.google.gwt.event.dom.client.ChangeHandler

public FileInputButton() {
    wrapper = new Span();
    wrapper.addStyleName(Styles.BTN);
    upload = new FileUpload();

    upload.addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            fireChanged();
        }
    });

    wrapper.add(upload);
    wrapper.addStyleName("btn-file");
    initWidget(wrapper);
}
 

/**
 * Initializes the list box that allows to select styles
 * @param listBox the list box to initialize
 * @param dataToName the mapping from the style ID to the human readable name of the style
 * @param dataToStyleName the mapping from the style ID to the CSS style name
 * @param defaultValue the default style ID that should be set as selected
 */
public void initializeListBox( final ListBox listBox, final Map<Integer, String> dataToName,
							   final Map<Integer, String> dataToStyleName, final int defaultValue) {
	//Initialize the list box with data
	Iterator< Entry<Integer,String> > entrySetIter = dataToName.entrySet().iterator();
	while( entrySetIter.hasNext() ) {
		Entry<Integer, String> entry = entrySetIter.next();
		listBox.addItem( entry.getValue(), dataToStyleName.get( entry.getKey() ) );
	}
	listBox.setVisibleItemCount( 1 );
	
	//Set the default value as being selected
	setListBoxStyleID( listBox, defaultValue, dataToStyleName );
	
	//Add the change listener
	listBox.addChangeHandler(new ChangeHandler() {
		public void onChange(ChangeEvent e) {
			//Update the sample view
			updateSampleViewStyles();
		}
	});
}
 

private final void addIntervalChangeHandler() {
	intervalListBox.addChangeHandler(new ChangeHandler() {

		@Override
		public void onChange(ChangeEvent event) {
			String divisor = intervalListBox.getValue(intervalListBox.getSelectedIndex());
			String headerName = getSelectedRadioValue();
			if (!(headerName.equalsIgnoreCase(ReportingConstants.MODULE) || headerName.equalsIgnoreCase(ReportingConstants.PLUGIN))) {
				headerName = ReportingConstants.MODULE;
			}
			List<Record> recordList = createTableData(reportList, Integer.parseInt(divisor));
			reportingListView.updateHeaders(headerName, intervalListBox.getItemText(intervalListBox.getSelectedIndex()));
			reportingListView.listView.updateRecords(recordList, presenter.getStartIndex(), presenter.getTotalCount());
		}
	});
}
 

public FolderSelectionWidget(final Map<String, String> batchClassesNameMap, final HandlerManager eventBus) {
	super();
	initWidget(BINDER.createAndBindUi(this));
	mainPanel.addStyleName(FolderManagementConstants.OPTIONS_BOX);
	batchClassSelectionListBox.setWidth(_150PX);
	batchClassSelectionListBox.addStyleName(FolderManagementConstants.CUSTOM_LIST_BOX);
	if (null != batchClassesNameMap && !batchClassesNameMap.isEmpty()) {
		Set<Entry<String, String>> entrySet = batchClassesNameMap.entrySet();
		for (Entry<String, String> entry : entrySet) {
			batchClassSelectionListBox.addItem(entry.getKey());
		}
		fireEventForFolderSelection(batchClassesNameMap, eventBus);
		batchClassSelectionListBox.addChangeHandler(new ChangeHandler() {

			@Override
			public void onChange(ChangeEvent event) {
				fireEventForFolderSelection(batchClassesNameMap, eventBus);
			}
		});
	} else {
		eventBus.fireEvent(new BatchClassChangeEvent());
	}
}
 

/**
 * Called after construction.
 */
@PostConstruct
protected void postConstruct() {
	sourceTablesTable.clear();
	
    // Change Listener for Available sources ListBox
    listboxSources.addChangeHandler(new ChangeHandler()
    {
    	// Changing the updates status
    	public void onChange(ChangeEvent event)
    	{
    		sourceTablesTable.clear();
			String srcName = getSelectedSource();
			if (srcName != null) {
				doGetTablesAndProcs(srcName);
			}
    	}
    });
    
    sourceTablesTable.setOwner(this.getClass().getName());
    sourceTablesTable.setShowHeader(false);
}
 

@Override
public HandlerRegistration addValueChangeHandler(ValueChangeHandler<T> handler)
{
	// Initialization code
	if (!valueChangeHandlerInitialized)
	{
		valueChangeHandlerInitialized = true;
		super.addChangeHandler(new ChangeHandler()
		{
			public void onChange(ChangeEvent event)
			{
				ValueChangeEvent.fire(EnumListBox.this, getValue());
			}
		});
	}
	return addHandler(handler, ValueChangeEvent.getType());
}
 

@Override
public HandlerRegistration addValueChangeHandler(ValueChangeHandler<T> handler)
{
	// Initialization code
	if (!valueChangeHandlerInitialized)
	{
		valueChangeHandlerInitialized = true;
		super.addChangeHandler(new ChangeHandler()
		{
			public void onChange(ChangeEvent event)
			{
				ValueChangeEvent.fire(SelectOneListBox.this, getValue());
			}
		});
	}
	return addHandler(handler, ValueChangeEvent.getType());
}
 

public ShiftsLimitTextBox(final RiaContext ctx, final EmployeePreferences employeePreferences) {
	shiftLimit=employeePreferences.getShiftsLimit();
	
	setStyleName("s2-preferencesJobsTextBox");
	setTitle(ctx.getI18n().job());
	setText(""+shiftLimit);

	addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			try {
				shiftLimit=(Integer.parseInt(getText()));
				ctx.getStatusLine().showInfo("Shift limit set to "+getText()); // TODO i18n
			} catch(Exception e) {
				ctx.getStatusLine().showError(getText()+" is not valid shift limit number"); // TODO i18n
			}
		}
	});
}
 

@Override
public HandlerRegistration addChangeHandler(final ChangeHandler handler) {
  if (!changeHandlerAdded) {
    changeHandlerAdded = true;
    final OrionTextViewOverlay textView = this.editorOverlay.getTextView();
    textView.addEventListener(
        OrionEventConstants.MODEL_CHANGED_EVENT,
        new OrionTextViewOverlay.EventHandlerNoParameter() {

          @Override
          public void onEvent() {
            fireChangeEvent();
          }
        });
  }
  return addHandler(handler, ChangeEvent.getType());
}
 

private ListBox createListBox() {
    List<EnumFieldDef.Item> listItems = new ArrayList<EnumFieldDef.Item>();
    listItems.add(new EnumFieldDef.Item("short", "Short Form"));
    listItems.add(new EnumFieldDef.Item("long", "Long Form"));
    EnumFieldDef list = new EnumFieldDef("Lists");
    list.addItems(listItems);
    list.setNullAllow(false);
    list.setErrMsg("This field is required. Select one from list");
    lists = GwtUtil.createComboBox(list);
    lists.addChangeHandler((new ChangeHandler() {
        public void onChange(ChangeEvent event) {
            formToSelect = lists.getValue(lists.getSelectedIndex());
            changePanel(formToSelect);
        }
    }));


    return lists;
}
 

private ListBox createListBox() {
    List<EnumFieldDef.Item> listItems = new ArrayList<EnumFieldDef.Item>();
    listItems.add(new EnumFieldDef.Item("short", "Short Form"));
    listItems.add(new EnumFieldDef.Item("long", "Long Form"));
    EnumFieldDef list = new EnumFieldDef("Lists");
    list.addItems(listItems);
    list.setNullAllow(false);
    list.setErrMsg("This field is required. Select one from list");
    lists = GwtUtil.createComboBox(list);
    lists.addChangeHandler((new ChangeHandler() {
        public void onChange(ChangeEvent event) {
            formToSelect = lists.getValue(lists.getSelectedIndex());
            changePanel(formToSelect);
        }
    }));


    return lists;
}
 

public ListBoxInputField(EnumFieldDef fieldDef) {
    _fieldDef= fieldDef;
    initWidget(_listBox);

    //list box setup
    _items= ((EnumFieldDef)_fieldDef).getEnumValues();
    for(EnumFieldDef.Item item : _items) {
        _listBox.addItem(item.getTitle());
    }
    _listBox.setTitle(_fieldDef.getShortDesc());
    reset();

    _listBox.addChangeHandler(new ChangeHandler() {
        public void onChange(ChangeEvent event) {
            _selectedIdx= _listBox.getSelectedIndex();
            ValueChangeEvent.fire(ListBoxInputField.this,_selectedIdx+"");
            updatePref();
        }
    });

   // label setup
}
 

DownloadBox(ChangeInfo change, String revision, PatchSet.Id psId) {
  this.change = change;
  this.revision = revision;
  this.psId = psId;
  this.commandTable = new FlexTable();
  this.scheme = new ListBox();
  this.scheme.addChangeHandler(
      new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
          renderCommands();
          if (Gerrit.isSignedIn()) {
            saveScheme();
          }
        }
      });

  setStyleName(Gerrit.RESOURCES.css().downloadBox());
  commandTable.setStyleName(Gerrit.RESOURCES.css().downloadBoxTable());
  scheme.setStyleName(Gerrit.RESOURCES.css().downloadBoxScheme());
  add(commandTable);
}
 

private void addChangeHandler(final PropertyEditorFieldInfo property,
                              final PropertyEditorComboBox listBox) {
    listBox.addChangeHandler(new ChangeHandler() {
                                 @Override
                                 public void onChange(ChangeEvent event) {
                                     int selectedIndex = listBox.getSelectedIndex();
                                     if (validate(property,
                                                  listBox.getItemText(selectedIndex))) {
                                         listBox.clearOldValidationErrors();
                                         property.setCurrentStringValue(listBox.getItemText(selectedIndex));
                                         propertyEditorChangeEventEvent.fire(new PropertyEditorChangeEvent(property,
                                                                                                           listBox.getItemText(selectedIndex)));
                                     } else {
                                         listBox.setValidationError(getValidatorErrorMessage(property,
                                                                                             listBox.getItemText(selectedIndex)));
                                         listBox.setSelectItemByText(property.getCurrentStringValue());
                                     }
                                 }
                             }

    );
}
 

private void setupZoomChangeHandler() {
    view.addZoomChangeHandler(new ChangeHandler() {

        private int m_currentZoom = 100;

        @Override
        public void onChange(final ChangeEvent event) {
            final int pct = view.getSelectedZoomLevel();
            if (m_currentZoom == pct) {
                return;
            }
            m_currentZoom = pct;
            view.setZoom(pct);
        }
    });
}
 

@Override
public void init(final RepositoryConfigurationPresenter presenter) {
    this.presenter = presenter;

    configureButton.setText(constants.Configure_Repository());
    sourceBranchText.setText("master");
    devBranchText.setText("dev");
    releaseBranchText.setText("release");
    currentVersionText.setReadOnly(true);
    chooseRepositoryBox.addChangeHandler(new ChangeHandler() {

        @Override
        public void onChange(ChangeEvent event) {
            String value = chooseRepositoryBox.getSelectedValue();
            GWT.log(value);

            presenter.loadRepositoryStructure(value);
        }
    });
    presenter.loadRepositories();
}
 

public static void selectFile(final Callback<JavaScriptObject, String> aCallback, String aFileTypes) {
	final FileUpload fu = new FileUpload();
	fu.getElement().getStyle().setPosition(Style.Position.ABSOLUTE);
	fu.setWidth("10px");
	fu.setHeight("10px");
	fu.getElement().getStyle().setLeft(-100, Style.Unit.PX);
	fu.getElement().getStyle().setTop(-100, Style.Unit.PX);
	fu.addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			Utils.JsObject jsFu = fu.getElement().cast();
			JavaScriptObject oFiles = jsFu.getJs("files");
			if (oFiles != null) {
				JsArray<JavaScriptObject> jsFiles = oFiles.cast();
				for (int i = 0; i < jsFiles.length(); i++) {
					try {
						aCallback.onSuccess(jsFiles.get(i));
					} catch (Exception ex) {
						Logger.getLogger(Utils.class.getName()).log(Level.SEVERE, null, ex);
					}
				}
			}
			fu.removeFromParent();
		}
	});
	RootPanel.get().add(fu, -100, -100);
	fu.click();
	Scheduler.get().scheduleFixedDelay(new Scheduler.RepeatingCommand() {
		@Override
		public boolean execute() {
			fu.removeFromParent();
			return false;
		}
	}, 1000 * 60 * 1);// 1 min
}
 

public StyledListBox(boolean isMultipleSelect) {
	super();
	setStyleName("form-control");
	setMultipleSelect(isMultipleSelect);
	addChangeHandler(new ChangeHandler() {

		@Override
		public void onChange(ChangeEvent event) {
			if (!isMultipleSelect()) {
				int selected = getSelectedIndex();
				if (selected == -1) {
					setValue(null, true);
				} else {
					setValue(associatedValues.get(selected), true);
				}
			}
		}

	});
}
 

@Override
public HandlerRegistration addChangeHandler(final ChangeHandler handler) {
    if (!changeHandlerAdded) {
        changeHandlerAdded = true;
        this.codeMirror.on(this.editorOverlay, CHANGE, new EventHandlers.EventHandlerOneParameter<CMChangeEventOverlay>() {

            @Override
            public void onEvent(final CMChangeEventOverlay param) {
                LOG.fine("Change event - state clean=" + editorOverlay.getDoc().isClean(getGenerationMarker())
                         + " (generation=" + getGenerationMarker() + ").");
                fireChangeEvent();
            }
        });
    }
    return addHandler(handler, ChangeEvent.getType());
}
 

private DataRequestParameterWidget createRequestWidget(String name, String value) {
  final DataRequestParameterWidget param;
  if (parameterKeyConstraint != null) {
    param = new ConstrainedParameterWidget(parameterKeyConstraint, name, value);
  } else {
    param = new CustomParameterWidget(name, value);
  }
  param.addChangeHandler(new ChangeHandler() {
      @Override
      public void onChange(ChangeEvent arg0) {
        Widget w = (Widget) param;
        dataRequestParameters.remove(w);
      }
    });
  return param;
}
 

@Override
public Widget getTail() {
	ChangeHandler changeHandler = new ChangeHandler() {
		public void onChange(ChangeEvent event) {
			npc.setGenitiveName(genitiveName.getText());
			updateParameter(event.getSource());
		}
	};
	genitiveName = new TextBox();
	genitiveName.setWidth("100%");
	genitiveName.addChangeHandler(changeHandler);
	genitiveName.setTitle(appConstants.quickNPCGenativeNameTitle());
	addWidgetToGrid(genitiveName, appConstants.quickNPCGenativeName());
	
	parametersPanel = new FlexTable();
	parametersPanel.setSize("100%", "100%");
	parametersPanel.getColumnFormatter().setWidth(0, "99%");
	parametersPanel.getColumnFormatter().setWidth(1, "1%");
	return parametersPanel;
}
 

public void apply(ParametersCalculation calc) {
		flowPanel.clear();
		this.calculation = calc;
		SpanLabel label = new SpanLabel(name+" = ");
		label.setStyleName(Styles.BOLD);
		flowPanel.add(label);
		constant = new DiceValueWidget(flowPanel);
		constant.apply(calculation.getConstant());
		constant.addChangeHandler(new ChangeHandler(){
			public void onChange(ChangeEvent event) {
				for (ChangeHandler handler : handlers) {
					handler.onChange(null);
				}
			}
		});
		if (overflowControl != null) {
			overflowControl.setValue(calc.isOverflowControl());
		}
//		add(constant);
		//parameters
		for (Parameter parameter : calculation.getParameters().keySet()) {
			addParameterToPanel(parameter);
		}
	}
 

private Widget createAspectRatioListBox()
{
    final ListBox box = new ListBox();
    for (WCAspectRatio algo : WCAspectRatioRegistry.list())
        box.addItem(algo.getDescription(), algo.getId());

    box.setSelectedIndex(findIndex(box, setting.getAspectRatio().getId()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCAspectRatio value = WCAspectRatioRegistry.getById(box.getValue(box.getSelectedIndex()));
            setting.setAspectRatio(value);
        }
    });

    box.setTitle("Desired aspect ratio of the drawing");

    return box;
}
 

private Widget createLayoutListBox()
{
    final GroupedListBox box = new GroupedListBox();
    for (WCLayoutAlgo algo : WCLayoutAlgoRegistry.list())
        box.addItem(algo.getType() + " | " + algo.getDescription(), algo.getId());

    box.setSelectedIndex(findIndex(box, setting.getLayoutAlgorithm().getId()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCLayoutAlgo value = WCLayoutAlgoRegistry.getById(box.getValue(box.getSelectedIndex()));
            setting.setLayoutAlgorithm(value);
        }
    });

    box.setTitle("Layout method for the word cloud");
    return box;
}
 

private ListBox createNumberListBox()
{
    final ListBox box = new ListBox();
    List<String> values = Arrays.asList("10", "20", "30", "40", "50", "75", "100", "125", "150", "200", "250", "300");

    for (int i = 0; i < values.size(); i++)
        box.addItem(values.get(i));

    box.setSelectedIndex(findIndex(box, String.valueOf(setting.getWordCount())));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            int value = Integer.parseInt(box.getValue(box.getSelectedIndex()));
            setting.setWordCount(value);
        }
    });

    box.setTitle("Number of words to include in the word cloud");

    return box;
}
 

private ListBox createFontListBox()
{
    final ListBox box = new ListBox();
    for (WCFont font : WCFontRegistry.list())
        box.addItem(font.getDescription(), font.getName());

    box.setSelectedIndex(findIndex(box, setting.getFont().getName()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCFont value = WCFontRegistry.getByName(box.getValue(box.getSelectedIndex()));
            setting.setFont(value);
        }
    });

    box.setTitle("Font family of the words");
    return box;
}
 

private ListBox createRankingListBox()
{
    final ListBox box = new ListBox();
    for (WCRankingAlgo algo : WCRankingAlgoRegistry.list())
        box.addItem(algo.getDescription(), algo.getId());

    box.setSelectedIndex(findIndex(box, setting.getRankingAlgorithm().getId()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCRankingAlgo value = WCRankingAlgoRegistry.getById(box.getValue(box.getSelectedIndex()));
            setting.setRankingAlgorithm(value);
        }
    });

    box.setTitle("Ranking method for computing word importance, which determines font size of each word");
    return box;
}
 

private Widget createColorListBox()
{
    final GroupedListBox box = new GroupedListBox();
    for (WCColorScheme scheme : WCColorSchemeRegistry.list())
        box.addItem(scheme.getType() + " | " + scheme.getDescription(), scheme.getName());

    box.setSelectedIndex(findIndex(box, setting.getColorScheme().getName()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCColorScheme value = WCColorSchemeRegistry.getByName(box.getValue(box.getSelectedIndex()));
            setting.setColorScheme(value);
        }
    });

    box.setTitle("Color theme of the words");
    return box;
}
 

private Widget createSimilarityListBox()
{
    final ListBox box = new ListBox();
    for (WCSimilarityAlgo font : WCSimilarityAlgoRegistry.list())
        box.addItem(font.getDescription(), font.getId());

    box.setSelectedIndex(findIndex(box, setting.getSimilarityAlgorithm().getId()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCSimilarityAlgo value = WCSimilarityAlgoRegistry.getById(box.getValue(box.getSelectedIndex()));
            setting.setSimilarityAlgorithm(value);
        }
    });

    box.setTitle("Similarity method for computing relatedness between words; similar words tend to be placed together");
    return box;
}
 

private Widget createMinLengthField()
{
    final IntegerBox box = new IntegerBox();
    box.setValue(setting.getMinWordLength());
    box.setMaxLength(2);
    box.setWidth("15px");

    box.addChangeHandler(new ChangeHandler()
    {
        @Override
        public void onChange(ChangeEvent event)
        {
            setting.setMinWordLength(box.getValue());
        }
    });

    box.setTitle("Specify the minimum number of characters in a word");
    return box;
}
 

@Override
public void onModuleLoad()
{
	MyCss css = GWT.create( MyCss.class );
	
	final ListBox listBox = new ListBox();
	listBox.addItem( "theme-1" );
	listBox.addItem( "theme-2" );
	listBox.addItem( "theme-3" );
	listBox.addChangeHandler( new ChangeHandler()
	{
		@Override
		public void onChange( ChangeEvent event )
		{
			ThemeManager.get().setTheme( listBox.getSelectedValue() );
		}
	} );
	
	Label label = new Label("This is the application, you can change theme with the list box above");
	label.addStyleName( css.panel() );
	
	RootPanel.get().add( listBox );
	RootPanel.get().add( label );
}
 

@Override
public HandlerRegistration addValueChangeHandler( ValueChangeHandler<T> handler )
{
	if( !registered )
	{
		registered = true;
		list.addChangeHandler( new ChangeHandler()
		{
			@Override
			public void onChange( ChangeEvent event )
			{
				ValueChangeEvent.fire( ListBox.this, getValue() );
			}
		} );
	}
	return addHandler( handler, ValueChangeEvent.getType() );
}
 

private void initResolutionDropdown() {
	defaultResolutions.addItem("Custom", "");
	defaultResolutions.addItem("1280 x 720 (wide)", "1280x720");
	defaultResolutions.addItem("1280 x 768 (wide)", "1280x768");
	defaultResolutions.addItem("1360 x 768 (wide)", "1360x768");
	defaultResolutions.addItem("1366 x 768 (wide)", "1366x768");
	defaultResolutions.addItem("1440 x 900 (wide)", "1440x900");
	defaultResolutions.addItem("1680 x 1050 (wide)", "1680x1050");
	defaultResolutions.addItem("1920 x 1080 (wide)", "1920x1080");
	defaultResolutions.addItem("1024 x 768", "1024x768");
	defaultResolutions.addItem("1280 x 1024", "1280x1024");
	defaultResolutions.addItem("1600 x 1200", "1600x1200");
	defaultResolutions.addItem("720 x 1280 (portrait)", "720x1280");
       defaultResolutions.addItem("768 x 1280 (portrait)", "768x1280");
	defaultResolutions.addItem("768 x 1360 (portrait)", "768x1360");
	defaultResolutions.addItem("768 x 1366 (portrait)", "768x1366");
	defaultResolutions.addItem("1080 x 1920 (portrait)", "1080x1920");
	
	defaultResolutions.addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			selectedValueChanged();
		}
	});
}
 

/**
 * Instantiates a new MultiValueListBox.
 */
public MultiValueListBox(Renderer<T> renderer, ProvidesKey<T> keyProvider) {
  this.keyProvider = keyProvider;
  this.renderer = renderer;
  ListBox listBox = new ListBox();
  listBox.setMultipleSelect(true);
  initWidget(listBox);
  getListBox().addChangeHandler(new ChangeHandler() {
    public void onChange(ChangeEvent event) {
      List<T> newValue = new ArrayList<>();
      for (int i = 0; i < values.size(); i++) {
        if (getListBox().isItemSelected(i)) {
          newValue.add(values.get(i));
        }
      }
      setValue(newValue, true);
    }
  });
}
 

public ValueMultiListBox(Renderer<T> renderer2, ProvidesKey<T> keyProvider2) {
    this.keyProvider = keyProvider2;
    this.renderer = renderer2;
    initWidget(new ListBox(true));
    getListBox().setVisibleItemCount(2);

    getListBox().addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            ListBox lb = getListBox();
            Collection<T> newValue = new ArrayList<T>();
            for (int i = 0; i < values.size(); i++) {
                if (lb.isItemSelected(i)) {
                    newValue.add(values.get(i));
                }
            }

            setValue(newValue, true);
        }
    });
}
 

@Test
public void testTextBox() throws Exception {
    TextBox tb = new TextBox();
    RootPanel.get().add(tb);
    final List events = new ArrayList();
    tb.addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            events.add(event);
        }
    });

    DomEvent.fireNativeEvent(Document.get().createChangeEvent(), tb);

    assertEquals(1, events.size());
}
 

/**
 * Constructor.
 */
public FormLabel() {
    super(Document.get().createLabelElement());
    setStyleName(Styles.CONTROL_LABEL);
    addHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            if (iconElement != null) {
                iconElement.removeFromParent();
            }
            String html = getHTML();
            if (showRequiredIndicator && html != null && !"".equals(html)) {
                iconElement = createIconElement();
                getElement().appendChild(iconElement);
            }
        }
    }, ChangeEvent.getType());
}
 

/**
 * Constructor.
 */
public HelpBlock() {
    super(Document.get().createSpanElement());
    setStyleName(Styles.HELP_BLOCK);
    addHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            if (iconElement != null) {
                iconElement.removeFromParent();
            }
            if (error && iconType != null) {
                iconElement = createIconElement();
                getElement().insertFirst(iconElement);
            }
        }
    }, ChangeEvent.getType());
}
 

public DeckPanelExample() {
  super("Deck Panel");

  DockPanel dock = new DockPanel();
  final DeckPanel deck = new DeckPanel();
  final ListBox list = new ListBox();
  list.addChangeHandler(new ChangeHandler() {
      public void onChange( ChangeEvent changeEvent )
      {
          int index = list.getSelectedIndex();
          deck.showWidget(index);
      }
  });

  for (String label : new String[] { "One", "Two", "Three", "Four"}) {
    list.addItem(label);
    deck.add(new Button(label));
  }
  deck.showWidget(0);

  dock.add(list, DockPanel.NORTH);
  dock.add(deck, DockPanel.CENTER);
  add(dock);
}
 

private ListBox booleanEditor(final String currentValue) {
    final ListBox listBox = listBoxEditor(booleanOperators,
                                          currentValue,
                                          false);
    listBox.addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(final ChangeEvent event) {
            final int selectedIndex = listBox.getSelectedIndex();
            final String selectedValue = listBox.getItemText(selectedIndex);
            final boolean enabled = "true".equalsIgnoreCase(selectedValue);
            ddReasonCodeAlgorithm.setEnabled(enabled);
            tbBaselineScore.setEnabled(enabled);
            ddReasonCodeField.setEnabled(enabled);
            for (final FlexTable cGrid : characteristicsTables) {
                //baseline score for each characteristic
                ((TextBox) cGrid.getWidget(2, 2)).setEnabled(enabled);
                //reason code for each characteristic
                ((TextBox) cGrid.getWidget(2, 3)).setEnabled(enabled);
            }
        }
    });
    return listBox;
}
 

public FieldEditor() {
    box = new TextBox();
    box.addChangeHandler(new ChangeHandler() {

        public void onChange(ChangeEvent event) {
            TextBox otherBox = (TextBox) event.getSource();

            if (!regex.equals("") && !otherBox.getText().matches(regex)) {
                Window.alert(GuidedRuleEditorResources.CONSTANTS.TheValue0IsNotValidForThisField(otherBox.getText()));
                box.setText(oldValue);
            } else {
                oldValue = otherBox.getText();
                updateSentence();
            }
        }
    });

    //Wrap widget within a HorizontalPanel to add a space before and after the Widget
    HorizontalPanel hp = new HorizontalPanel();
    hp.add(new HTML(" "));
    hp.add(box);
    hp.add(new HTML(" "));

    initWidget(hp);
}
 

public AddImportPopup() {
    setTitle(ImportConstants.INSTANCE.addImportPopupTitle());

    add(new ModalBody() {{
        add(uiBinder.createAndBindUi(AddImportPopup.this));
    }});
    add(footer);

    importTypeListBox.getElement().getStyle().setWidth(100.0,
                                                       Style.Unit.PCT);
    importTypeListBox.addChangeHandler(new ChangeHandler() {

        @Override
        public void onChange(ChangeEvent event) {
            final boolean enable = importTypeListBox.getSelectedIndex() > 0;
            footer.enableOkButton(enable);
        }
    });
}
 

@Override
public void showDialog() {
    uploadFormVPanel.clear();
    certFile = new FileUpload();
    certFile.setHeight("22px");
    certFile.setWidth("100%");
    certFile.setName("certFile");
    certFile.addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            delegate.onFileNameChanged();
        }
    });
    uploadFormVPanel.add(certFile);

    this.show();
}
 

private void init() {
    lstTypes.addChangeHandler(new ChangeHandler() {
        public void onChange(ChangeEvent arg0) {
            updateType(lstTypes);
        }
    });

    new ListService().listBeans(ModelNames.GOODSTYPE, new ListService.Listener() {
        public void onSuccess(List<BeanObject> beans) {
            for (BeanObject obj : beans) {
                String id = obj.getString(IGoodsType.ID);
                lstTypes.addItem(obj.getString(IGoodsType.NAME), id);
                types.put(id, obj);
            }
            
            updateType(lstTypes);
        }
    });
    add(lstTypes);
    add(contentPanel);              
}
 

/**
 * Init etl program widget' right grid panel
 */
public void init_rightGrid(){
	Label table = new Label("table");
	Label column = new Label("column");
	Label format = new Label("format");
	rightGrid = new Grid(3,2);
	rightGrid.setWidget(1,0,table);
	tableLB = new DescListBox();
	tableLB.setVisibleItemCount(1);
	tableLB.setStyleName("bda-etlpanel-listbox");
	rightGrid.setWidget(1,1,tableLB);

	rightGrid.setWidget(2,0,column);
	columnLB = new DescListBox();
	columnLB.setMultipleSelect(true);
	columnLB.setVisibleItemCount(2);
	columnLB.setStyleName("bda-etlpanel-Multilistbox");
	rightGrid.setWidget(2,1,columnLB);

	rightGrid.setWidget(0,0,format);
	formatLB = new DescListBox();
	formatLB.addItem("json");
	formatLB.addItem("tsv");
	formatLB.addItem("csv");
	formatLB.addItem("parquet");
	formatLB.setVisibleItemCount(1);
	formatLB.setStyleName("bda-etlpanel-listbox");
	rightGrid.setWidget(0,1,formatLB);
	mid_westPanel.add(rightGrid);

	tableLB.addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent changeEvent) {
			getColumn();
		}
	});
}
 

public MyCell(CurriculumInterface curriculum, CurriculumClassificationInterface classification) {
	iCurriculum	= curriculum;
	iClasf = classification;
	
	iPanel = new HorizontalPanel();
	
	iTextBox = new UniTimeTextBox(6, ValueBoxBase.TextAlignment.RIGHT);
	iTextBox.addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			try {
				if (iTextBox.getText().isEmpty()) {
					iClasf.setExpected(null);
				} else {
					iClasf.setExpected(Integer.valueOf(iTextBox.getText()));
				}
			} catch (Exception e) {
				iClasf.setExpected(null);
			}
			update();
			for (MySumCell sum: iSums)
				sum.update();
		}
	});
	
	iRearLabel = new HTML("", false);
	iRearLabel.setWidth("50px");
	iRearLabel.setStyleName("unitime-Label");
	iRearLabel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);
	
	iPanel.add(iTextBox);
	iPanel.setCellVerticalAlignment(iTextBox, HasVerticalAlignment.ALIGN_MIDDLE);
	
	iPanel.add(iRearLabel);
	iPanel.setCellVerticalAlignment(iRearLabel, HasVerticalAlignment.ALIGN_MIDDLE);

	initWidget(iPanel);	
	
	update();
}
 

public ShareTextBox(int column, Float share, Float defaultShare) {
	super(6, ValueBoxBase.TextAlignment.RIGHT);
	iColumn = column;
	iShare = share;
	iDefaultShare = defaultShare;
	addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			try {
				if (getText().isEmpty()) {
					iShare = null;
				} else if (getText().endsWith("%")) {
					iShare = (float)NF.parse(getText().substring(0, getText().length() - 1)) / 100.0f;
					if (iShare > 1.0f) iShare = 1.0f;
					if (iShare <= 0.0f) iShare = 0.0f;
				} else {
					Integer exp = iClassifications.getExpected(iColumn);
					if (exp == null || exp == 0)
						iShare = (float)NF.parse(getText()) / 100.0f;
					else
						iShare = (float)NF.parse(getText()) / iClassifications.getExpected(iColumn);
					if (iShare > 1.0f) iShare = 1.0f;
					if (iShare < 0.0f) iShare = 0.0f;
				}
			} catch (Exception e) {
				iShare = null;
			}
			update();
		}
	});
	update();
}
 

private FormPanel getFilePanel() {
	VerticalLayoutContainer layoutContainer = new VerticalLayoutContainer();

	file = new FileUploadField();

	file.addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			setAutoFormat(file.getValue());
			String name = file.getValue().substring(0, file.getValue().lastIndexOf("."));
			name = name.substring(file.getValue().lastIndexOf("\\") +1);
			layerName.setText(name);
		}
	});

	file.setName(UIMessages.INSTANCE.gdidFileUploadFieldText());
	file.setAllowBlank(false);

	layoutContainer.add(new FieldLabel(file, UIMessages.INSTANCE.file()),
			new VerticalLayoutData(-18, -1));
	layoutContainer.add(new Label(UIMessages.INSTANCE.maxFileSizeText()),
			new VerticalLayoutData(-18, -1));

	uploadPanel = new FormPanel();
	uploadPanel.setMethod(Method.POST);
	uploadPanel.setEncoding(Encoding.MULTIPART);
	uploadPanel.setAction("fileupload.do");
	uploadPanel.setWidget(layoutContainer);

	return uploadPanel;
}
 

/**
 * Creates a drop down menu for selecting Template repositories.
 * @return the drop down menu of repository Urls.
 */
private ListBox makeTemplatesMenu() {
  final ListBox templatesMenu = new ListBox();
  templatesMenu.addItem(MESSAGES.templateUploadNewUrlCaption());
  templatesMenu.addItem(MIT_TEMPLATES);

  for (int k = 0; k < dynamicTemplateUrls.size(); k++) { // Dynamically added Urls
    templatesMenu.addItem(dynamicTemplateUrls.get(k));
  }
  templatesMenu.setSelectedIndex(MIT_TEMPLATES_INDEX);
  templatesMenu.addChangeHandler(new ChangeHandler() {
      public void onChange(ChangeEvent event) {
        int selectedIndex = templatesMenu.getSelectedIndex();

        if (selectedIndex == 0) {
          templatesMenu.setSelectedIndex(lastSelectedIndex);
          usingExternalTemplate = true; // MIT templates at index 1
          removeButton.setVisible(false);
          new InputTemplateUrlWizard(instance).center();     // This will do a callback
        } else if (selectedIndex == 1) {
          removeButton.setVisible(false);          lastSelectedIndex = selectedIndex;
          usingExternalTemplate = false; // MIT templates at index 1
          templateHostUrl = "";
          retrieveSelectedTemplates(templatesMenu.getValue(selectedIndex));  // may do callback
        } else {
          removeButton.setVisible(true);         lastSelectedIndex = selectedIndex;
          usingExternalTemplate = true; // MIT templates at index 1
          templateHostUrl = templatesMenu.getValue(selectedIndex);
          retrieveSelectedTemplates(templatesMenu.getValue(selectedIndex));  // may do callback
        }
      }
    });
  templatesMenu.setVisibleItemCount(1);  // Turns menu into a drop-down list).
  return templatesMenu;
}
 

public AnalysisWidget(String width) {

        mainPanel.setTitle("Select a statistic to compute and the space and time dimensions over which to compute it");
        layoutPanel.resize(2, 2);
        layoutPanel.setTitle("Optional Analysis Controls");
        // layoutPanel.setWidget(0, 0, apply);
        layoutPanel.setWidget(0, 0, new Label("Compute:"));
        analysisType.addChangeHandler(new ChangeHandler() {
            @Override
            public void onChange(ChangeEvent event) {
                fireAnalysisTypeChangeEvent(event);
                eventBus.fireEventFromSource(new WidgetSelectionChangeEvent(false, false), AnalysisWidget.this);
            }
        });
        analysisAxis.addChangeHandler(new ChangeHandler(){@Override
            public void onChange(ChangeEvent arg0) {
            eventBus.fireEventFromSource(new WidgetSelectionChangeEvent(false, false), AnalysisWidget.this);
        }
        });
        analysisType.addItem("None");
        analysisType.addItem("Average");
        analysisType.addItem("Minimum");
        analysisType.addItem("Maximum");
        analysisType.addItem("Sum");
        analysisType.addItem("Variance");
        analysisType.setSelectedIndex(0);
        layoutPanel.setWidget(0, 1, analysisType);
        layoutPanel.setWidget(1, 0, new Label("over:"));
        layoutPanel.setWidget(1, 1, analysisAxis);

        mainPanel.add(layoutPanel);

        initWidget(mainPanel);

    }
 

@Override
public void buildPanel() {
    csVPanel = new ViewerPanel();
    addLabel();

    ListBox labelsLBox = new ListBox();
    labelsLBox.addItem("Add label", "0");
    labelsLBox.addItem("Set font", "1");
    labelsLBox.addItem("Set properties", "2");
    labelsLBox.addItem("Offset label by distance", "3");
    labelsLBox.addItem("Fade label by distance", "4");
    labelsLBox.addChangeHandler(new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
            ListBox source = (ListBox) event.getSource();
            reset();
            switch (source.getSelectedValue()) {
                case "0": addLabel(); break;
                case "1": setFont(); break;
                case "2": setProperties(); break;
                case "3": offsetByDistance(); break;
                case "4": fadeByDistance(); break;
                default: break;
            }
        }
    });

    AbsolutePanel aPanel = new AbsolutePanel();
    aPanel.add(csVPanel);
    aPanel.add(labelsLBox, 20, 20);

    contentPanel.add(new HTML("<p>Create Labels</p>"));
    contentPanel.add(aPanel);

    initWidget(contentPanel);
}
 

private FileUpload createFileUpload() {
  fileUpload = new FileUpload();
  fileUpload.getElement().getStyle().setDisplay(Style.Display.NONE);

  if (fileTypes != null) {
    // Convert the format that the SWFUpload/Flash parameter expects to the W3C DOM standard
    // See: http://dev.w3.org/html5/spec/states-of-the-type-attribute.html#attr-input-accept
    fileUpload.getElement()
        .setAttribute("accept", this.fileTypes.replaceAll("\\;", ",").replaceAll("\\*\\.", "."));

    // TODO(jake): Need to consider validation of this in the file queued handler as well,
    // as the browsers don't appear to consistently support the "accept" attribute
  }

  final AbsolutePanel panel = this;

  fileUpload.addChangeHandler(new ChangeHandler() {
    public void onChange(ChangeEvent event) {

      JsArray<?> selectedFiles = nativeGetSelectedFiles(fileUpload.getElement());

      // Every time a file is selected replace the FileUpload component running in the DOM so that
      // the user can continue to attempt uploading the same file multiple times (otherwise the
      // "ChangeHandler" never fires)
      panel.remove(fileUpload);
      panel.add(createFileUpload());

      addFilesToQueue(selectedFiles);

    }
  });
  return fileUpload;
}
 

/**
 * The simple constructor
 */
public UserStatusWidget() {
	//Set the alignment
	mainHPanel.setVerticalAlignment( HasVerticalAlignment.ALIGN_MIDDLE );
	//Set the user label style
	userNameLabel.addStyleName( CommonResourcesContainer.USER_NAME_LABEL_STYLE );
	//Construct the widget components
	mainHPanel.add( userNameLabel );
	mainHPanel.add( new HTML(" ") );
	//Add the status image to the panel
	userStatusImage.setStyleName( CommonResourcesContainer.USER_STATUS_IMAGE_STYLE_NAME );
	statusImagePanel.add( userStatusImage );
	mainHPanel.add( statusImagePanel );
	userStatusesBox.setEnabled( true );
	//Fill out the status list box
	Iterator<String> iter = UserStatusHelper.getStatusStringToStatusID().keySet().iterator();
	while( iter.hasNext() ) {
		String statusString = iter.next();
		userStatusesBox.addItem( statusString, statusString );
	}
	//Add the change handler
	userStatusesBox.addChangeHandler( new ChangeHandler(){
		public void onChange(ChangeEvent e){
			//Get the selected user status and set it on the server and here
			UserStatusManager.getUserStatusQueue().setCurrentUserStatus( getNewlySelectedUserStatus() );
		}
	});
	//Add the status list box to the panel
	userStatusesBox.setStyleName( CommonResourcesContainer.USER_STATUS_LIST_BOX_STYLE_NAME );
	mainHPanel.add( userStatusesBox );
			
	//Initialize the widget
	initWidget( mainHPanel );
}
 

public ListBoxField() {
  listBox.addStyleName(style.ListBoxField());
  listBox.addChangeHandler(new ChangeHandler() {

    @Override
    public void onChange(ChangeEvent event) {
      ValueChangeEvent.fire(ListBoxField.this, null);
    }
  });
}
 

private void addFileUploadForm() {
  file = new FileUpload();
  file.setHeight("22px");
  file.setWidth("100%");
  file.setName("file");
  file.ensureDebugId("file-uploadFile-ChooseFile");
  file.addChangeHandler(
      new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
          delegate.onFileNameChanged();
        }
      });
  uploadPanel.insert(file, 0);
}
 

private void addFile() {
  file = new FileUpload();
  file.setHeight("22px");
  file.setWidth("100%");
  file.setName("file");
  file.ensureDebugId("file-uploadFile-ChooseFile");
  file.addChangeHandler(
      new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
          delegate.onFileNameChanged();
        }
      });
  uploadPanel.insert(file, 0);
}
 

@Override
public void addBranchChangedHandler(final TextChangedHandler changeHandler) {
  contributionBranchName.addChangeHandler(
      new ChangeHandler() {
        @Override
        public void onChange(ChangeEvent event) {
          changeHandler.onTextChanged(contributionBranchName.getSelectedItemText());
        }
      });
}
 

private FormPanel getFilePanel() {
	VerticalLayoutContainer layoutContainer = new VerticalLayoutContainer();

	file = new FileUploadField();

	file.addChangeHandler(new ChangeHandler() {
		@Override
		public void onChange(ChangeEvent event) {
			setAutoFormat(file.getValue());
			String name = file.getValue().substring(0, file.getValue().lastIndexOf("."));
			name = name.substring(file.getValue().lastIndexOf("\\") +1);
			layerName.setText(name);
		}
	});

	file.setName(UIMessages.INSTANCE.gdidFileUploadFieldText());
	file.setAllowBlank(false);

	layoutContainer.add(new FieldLabel(file, UIMessages.INSTANCE.file()),
			new VerticalLayoutData(-18, -1));
	layoutContainer.add(new Label(UIMessages.INSTANCE.maxFileSizeText()),
			new VerticalLayoutData(-18, -1));

	uploadPanel = new FormPanel();
	uploadPanel.setMethod(Method.POST);
	uploadPanel.setEncoding(Encoding.MULTIPART);
	uploadPanel.setAction("fileupload.do");
	uploadPanel.setWidget(layoutContainer);

	return uploadPanel;
}
 

/**
 * Sets the Change() event handler in many widgets
 * @param handler the handler
 * @param widgets the widgets
 */
public static void addChangeHandler(final ChangeHandler handler,final HasChangeHandlers... widgets) {
	if (handler != null && widgets != null && widgets.length > 0) {
		for (HasChangeHandlers w : widgets) {
			if (w != null) w.addChangeHandler(handler);
		}
	}
}
 

public HandlerRegistration addChangeHandler(ChangeHandler handler) {
    chandler = handler;
    HandlerRegistration hr = new HandlerRegistration() {
                public void removeHandler() {
                    chandler = null;
                }
            };
    return hr;
}