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<g:FlexTable u:field="cg"/> </g:HTMLPanel> </u:UiBinder>
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As to the View code, the most interesting parts are the UiBinder related matters, and the use of the composite Country/State widget Note that the grid headings must be initialized through Java code because you cannot do that with UiBinder The CITIES_ PAGE_SIZE constant will be used for paging
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package comfkerekimvpprojectclientcitiesBrowser2; // imports public class CitiesBrowserView extends View implements CitiesBrowserDisplay { @UiTemplate("CitiesBrowserViewuixml") interface Binder extends UiBinder<HTMLPanel, CitiesBrowserView> { } public static final int CITIES_PAGE_SIZE = 20;
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Let s bind the form to the UiBinder design Note that we are constructing some of the buttons on our own, but we could have let UiBinder create them, and then set their properties in our code
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private static final Binder binder = GWTcreate(Binderclass); @UiField CountryStateView countryStateView; @UiField FlexTable cg; @UiField(provided = true) Button firstButton = new Button("First " + CITIES_PAGE_SIZE + " cities"); @UiField(provided = true) Button previousButton = new Button("Previous " + CITIES_PAGE_SIZE); @UiField(provided = true) Button nextButton = new Button("Next " + CITIES_PAGE_SIZE); SimpleCallback<Object> onFirstClickCallback; SimpleCallback<Object> onPreviousClickCallback;
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SimpleCallback<Object> onNextClickCallback; SimpleCallback<Object> onCountryStateChangeCallback;
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Creating the View is simple; the only remarkable point is that we have to finish the cities grid (cg) formatting ourselves because there isn t any way (at least yet) to do so with UiBinder
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public CitiesBrowserView() { super(); HTMLPanel dlp = bindercreateAndBindUi(this); initWidget(dlp); cgsetText(0, cgsetText(0, cgsetText(0, cgsetText(0, } 0, 1, 2, 3, "Name"); "Population"); "Latitude"); "Longitude");
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There are just two methods related to the CountryStateView widget
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@Override public CountryStateDisplay getCountryState() { return countryStateView; } @UiHandler("countryStateView") void uiOnChange(ValueChangeEvent<Object> event) { onCountryStateChangeCallbackonSuccess(null); }
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The rest of the methods are trivial
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@Override public void setCityData(int i, String name, String pop, String lat, String lon) { cgsetText(i, cgsetText(i, cgsetText(i, cgsetText(i, } @Override public void setOnCountryStateChangeCallback(SimpleCallback<Object> acb) { onCountryStateChangeCallback = acb; } @Override public void setOnFirstClickCallback(SimpleCallback<Object> acb) { onFirstClickCallback = acb; } 0, 1, 2, 3, name); pop); lat); lon);
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// setOnNextClickCallback and setOnPreviousClickCallback are similar @UiHandler("firstButton") void uiOnFirstClick(ClickEvent event) { onFirstClickCallbackonSuccess(null); } // the handlers for the two other buttons are similar }
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Finally, let s look to the Presenter, which must deal not only with the grid and buttons, but also with the Country/State widget changes
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package comfkerekimvpprojectclientcitiesBrowser2; // imports public class CitiesBrowserPresenter extends Presenter<CitiesBrowserDisplay> { public static String PLACE = "citybrowse"; int currentStart = 0; CountryStatePresenter csp; public CitiesBrowserPresenter(final String params, final CitiesBrowserDisplay citiesBrowserDisplay, final Environment environment) { super(params, citiesBrowserDisplay, environment); csp = new CountryStatePresenter("", getDisplay()getCountryState(), environment); clearCities();
Note how the following methods implement paging The displayCities() method can be used for displaying actual cities, whereas displayEmptyCities() just displays empty placeholders; see the clearCities() method, for example
getDisplay()setOnFirstClickCallback(new SimpleCallback<Object>() { @Override public void goBack(Object result) { if (checkCountryAndState()) { currentStart = 0; getAndDisplayCities(); } } });
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// // // //
setOnPreviousClickCallback is similar, but does currentStart -= CitiesBrowserViewCITIES_PAGE_SIZE while setOnNextClickCallback does currentStart += CitiesBrowserViewCITIES_PAGE_SIZE;
getDisplay()setOnCountryStateChangeCallback(new SimpleCallback<Object>() { @Override public void goBack(Object result) { clearCities(); } }); }
Because we associated empty values to the Select messages in both listboxes, checking if the user has picked something in both fields is easy
boolean checkCountryAndState() { return !getDisplay()getCountryState()getCountry()isEmpty() && !getDisplay()getCountryState()getState()isEmpty(); } void clearCities() { currentStart = 0; displayEmptyCities(0, ""); } /** * Display all cities in citiesList in the grid * If there aren't enough cities * to fill out the grid, empty the extra rows * * @param pCitiesList * Hash map ordered alphabetically by city name, with up to * CITIES_PAGE_SIZE cities */ void displayCities(final LinkedHashMap<String, ClientCityData> pCitiesList) { final NumberFormat nf = NumberFormatgetDecimalFormat(); int i = 0; for (final String it : pCitiesListkeySet()) { i++; final ClientCityData cd = pCitiesListget(it); getDisplay()setCityData(i, cdcityName, nfformat(cdpopulation), nfformat(cdlatitude), nfformat(cdlongitude)); }
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displayEmptyCities(i, ""); } /** * Blank out all lines in the cities grid, * from the line pSince up to the end * * @param pSince * First line to blank * * @param pDisplayText * Text to display in the first column; * may be "Loading" or "" */ void displayEmptyCities(int pSince, final String pDisplayText) { while (pSince < CitiesBrowserViewCITIES_PAGE_SIZE) { pSince++; getDisplay()setCityData(pSince, pDisplayText, "", "", ""); } }
Now we get to the actual display code We use the displayEmptyCities() method to display a Loading text, which will be replaced by the actual cities names when their data arrives Should there not be enough cities to fill the table, blank lines would be displayed instead
void getAndDisplayCities() { if (currentStart < 0) { currentStart = 0; } displayEmptyCities(0, "Loading"); getEnvironment()getModel()getCities( getDisplay()getCountryState()getCountry(), getDisplay()getCountryState()getState(), currentStart, CitiesBrowserViewCITIES_PAGE_SIZE, new SimpleCallback<LinkedHashMap<String, ClientCityData>>() { @Override public void goBack(LinkedHashMap<String, ClientCityData> result) { displayCities(result); } }); } }
Note that the main CitiesBrowserView includes the smaller CountryStateView, but doesn t know about its inner changes unless the latter s presenter fires a