private KeywordSearchEvent createKeyworkSearchEvent() {
   KeywordSearchEvent event = new KeywordSearchEvent();
   // city
   int cityIndex = getDisplay().getCitySelects().getSelectedIndex();
   String city = getDisplay().getCitySelects().getValue(cityIndex);
   event.setCity(city);
   // only today
   boolean onlyToday = getDisplay().getOnlyTodayCheckBox().getValue();
   event.setOnlyToday(onlyToday);
   // current page
   event.setCurrentPage(getDisplay().getKeywordPageList().getCurrentPage());
   // keyword
   String keyword = getDisplay().getSearchTextBox().getText();
   event.setKeyword(keyword);
   return event;
 }
  @Override
  protected void onBind() {

    registerHandler(
        getDisplay()
            .getCitySelects()
            .addChangeHandler(
                new ChangeHandler() {

                  @Override
                  public void onChange(ChangeEvent event) {
                    eventBus.fireEvent(createRefreshEvent());
                  }
                }));

    registerHandler(
        getDisplay()
            .getOnlyTodayCheckBox()
            .addValueChangeHandler(
                new ValueChangeHandler<Boolean>() {

                  @Override
                  public void onValueChange(ValueChangeEvent<Boolean> event) {
                    eventBus.fireEvent(createRefreshEvent());
                  }
                }));

    registerHandler(
        getDisplay()
            .getCategoryTabPanel()
            .addSelectionHandler(
                new SelectionHandler<Integer>() {

                  @Override
                  public void onSelection(SelectionEvent<Integer> event) {
                    eventBus.fireEvent(createRefreshEvent());
                  }
                }));

    Collection<TabLayoutPanel> orderTypePanelList =
        getDisplay().getOrderTypeTabPanelList().values();
    for (TabLayoutPanel orderTab : orderTypePanelList) {
      registerHandler(
          orderTab.addSelectionHandler(
              new SelectionHandler<Integer>() {

                @Override
                public void onSelection(SelectionEvent<Integer> event) {
                  eventBus.fireEvent(createRefreshEvent());
                }
              }));
    }

    // previous page
    Collection<PageListWidget> pageListWidgetList = getDisplay().getPageListWidgetList().values();
    for (final PageListWidget page : pageListWidgetList) {
      // previous
      registerHandler(
          page.getPreviousPage()
              .addClickHandler(
                  new ClickHandler() {

                    @Override
                    public void onClick(ClickEvent event) {
                      page.previousPage();
                      eventBus.fireEvent(createRefreshEvent());
                    }
                  }));
      // next
      registerHandler(
          page.getNextPage()
              .addClickHandler(
                  new ClickHandler() {

                    @Override
                    public void onClick(ClickEvent event) {
                      page.nextPage();
                      eventBus.fireEvent(createRefreshEvent());
                    }
                  }));
    }

    // init load
    getDisplay()
        .getCategoryTabPanel()
        .addAttachHandler(
            new Handler() {

              @Override
              public void onAttachOrDetach(AttachEvent event) {
                RefreshSearchResultEvent refreshSearchResultEvent = new RefreshSearchResultEvent();
                refreshSearchResultEvent.setCategory(Category.getDisplayOrder()[0]);
                refreshSearchResultEvent.setOrderType(OrderType.getDisplayOrder()[0]);

                // No city select
                refreshSearchResultEvent.setCity("");
                refreshSearchResultEvent.setCurrentPage(1);
                refreshSearchResultEvent.setOnlyToday(false);
                eventBus.fireEvent(refreshSearchResultEvent);
              }
            });

    registerHandler(
        getDisplay()
            .getCitySelects()
            .addAttachHandler(
                new Handler() {

                  @Override
                  public void onAttachOrDetach(AttachEvent event) {
                    dispatch.execute(
                        new GetCityNames(),
                        new SimpleCallback<CityNames>() {

                          @Override
                          public void onSuccess(CityNames result) {
                            ArrayList<Item> cityList = result.getCityList();
                            getDisplay().getCitySelects().clear();
                            for (Item city : cityList) {
                              getDisplay()
                                  .getCitySelects()
                                  .addItem(city.getDisplayName(), city.getValue());
                            }
                          }
                        });
                  }
                }));

    // keyword search
    registerHandler(
        getDisplay()
            .getSearchButton()
            .addClickHandler(
                new ClickHandler() {

                  @Override
                  public void onClick(ClickEvent event) {
                    String value = getDisplay().getSearchTextBox().getText();
                    if (value == null || value.trim().isEmpty()) {
                      // TODO: validate check
                      return;
                    }
                    eventBus.fireEvent(createKeyworkSearchEvent());
                  }
                }));

    registerHandler(
        eventBus.addHandler(
            KeywordSearchEvent.getType(),
            new KeywordSearchHandler() {

              @Override
              public void onRefresh(KeywordSearchEvent event) {
                // select the first one.
                getDisplay().getCategoryTabPanel().selectTab(0);
                // hide and show
                getDisplay().getKeywordResultPanel().setVisible(true);

                getDisplay().getCategoryAllPanel().setVisible(false);
              }
            }));

    registerHandler(
        eventBus.addHandler(
            RefreshSearchResultEvent.getType(),
            new RefreshSearchResultHandler() {

              @Override
              public void onRefresh(RefreshSearchResultEvent event) {
                // hide and show
                getDisplay().getKeywordResultPanel().setVisible(false);
                getDisplay().getCategoryAllPanel().setVisible(true);
              }
            }));
  }