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6 Communicating with Your Server
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Finally, so the encompassing View can learn whenever the user has picked a different country/state pair of values, we add firing event logic to the state change handler
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getDisplay()setOnStateChangeCallback(new SimpleCallback<Object>() { @Override public void goBack(Object result) { ValueChangeEventfire(getDisplay(), null); } }); } }
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Now, how shall we use this new widget Let s move to the next section and develop a simple paging application that can let us inspect all the cities in a given state of a country We ll come back to this in 14, Optimizing for Application Speed, when we consider using caching for enhancing performance
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A Look at MVP
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With the work we have done up to now, we can now look to the Model, the last component of MVP, which we had left aside (We mentioned the Environment object would be a singleton, and it would include a Model object to connect with the server, but that was as far as we had gotten in 5, Programming the User Interface ) Anything that has to do with servlets (RPC) or services, shall be in the Model We have to provide the necessary services (built with GWTcreate() as shown earlier in this chapter) but since they can be reused, it makes sense to create them only once, store them in local variables, and use them whenever needed We can even go one better and not create them until actually needed ( lazy evaluation )
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public class Model { private LoginServiceAsync loginService; private WorldServiceAsync worldService; private XhrProxyAsync xhrProxy; public LoginServiceAsync getRemoteLoginService() { if (loginService == null) { loginService = GWTcreate(LoginServiceclass); } return loginService; } public WorldServiceAsync getRemoteWorldService() { if (worldService == null) { worldService = GWTcreate(WorldServiceclass); } return worldService; }
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public XhrProxyAsync getRemoteXhrProxy() { if (xhrProxy == null) { xhrProxy = GWTcreate(XhrProxyclass); } return xhrProxy; } }
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We haven t yet seen the XhrProxy service; we ll get to it in the next chapter We ll add some methods later to this class, because having code all over our application using services directly is not a good design (Also, it won t help with testing of the kind we ll do in 13, or some optimizations we ll see in 14) We should rather concentrate all such communication tasks within the Model class, and no other part of the system should know about the actual implementation details, but we ll get to this later
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A Country/State Cities Browser
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Given the Country/State composite widget we just developed, we can use it (even with UiBinder) to produce a simple city paging form We could have developed it without using the new widget (see the provided source code for that) but it wouldn t give us any code reusing The form (please, no snide comments about my graphic design abilities!) should look like Figure 62
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Figure 62 A simple city browser application enables us to page through
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the cities in any state of any country The country/state pair is actually a separate widget, also developed with the MVP design pattern, and included within another MVP patterned form
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The Display interface for the View is short Note how the setCityData() method receives the number of the line to set (i) as a parameter; thus, the Presenter can initialize a whole table row by row, a line at a time
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package comfkerekimvpprojectclientcitiesBrowser2; // imports public interface CitiesBrowserDisplay extends Display { CountryStateDisplay getCountryState(); void setCityData(final int i, final String name, final String pop, final String lat, final String lon); void setOnCountryStateChangeCallback(SimpleCallback<Object> acb); void setOnFirstClickCallback(SimpleCallback<Object> acb); void setOnNextClickCallback(SimpleCallback<Object> acb); void setOnPreviousClickCallback(SimpleCallback<Object> acb); }
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The getCountryState() method provides access to the included View (but defined in terms of its interface) so it can be injected into its own presenter, as shown next The setCityData() method loads a grid row with city data The setOnCountryStateChangeCallback() method is provided so that the Presenter can learn whenever there was a change, to erase the grid data and set things up for a new city Finally, the last three methods have to do with the three buttons used for paging back and forth through the cities The main view is defined through UiBinder and is interesting because it includes our composite Country/State widget by means of the cs namespace This file should be called CitiesBrowserViewuixml in accordance with standard naming rules
< xml version="10" encoding="UTF-8" > <!DOCTYPE u:UiBinder SYSTEM "http://dlgooglecom/gwt/DTD/xhtmlent"> <u:UiBinder xmlns:u='urn:ui:comgooglegwtuibinder' xmlns:g='urn:import:comgooglegwtuserclientui' xmlns:cs='urn:import:comfkerekimvpprojectclientcountryState' > <g:HTMLPanel> <h1>CitiesBrowser2</h1> Country/State:<cs:CountryStateView u:field="countryStateView"/> <br /> <g:Button u:field="firstButton"/> <g:Button u:field="previousButton"/> <g:Button u:field="nextButton"/> <br /> <br />