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To use UiBinder, you need to add the <inherits name="comgooglegwtuibinder UiBinder"/> declaration to the gwtxml module description file for your application For each object that uses UiBinder, you also need to create (at least) one uixml file (with the layout for your view, including both HTML code and GWT widgets) and include some annotations so the right code is generated You can also rest assured that UiBinder checks (at compile time) all cross references between your XML declaration file and your Java code, to weed out mistakes; the Google Plugin for Eclipse is UiBinderaware, and errors appear with the classical red, wiggly underline Of course, before going any further, you should understand that UiBinder is not your usual template interpreter All code generation is done at compile time and not at runtime There are no loops or conditional layout statements, as usual with template engines And, of course, there is no data binding and no value loading; getting data to and from your widgets is still your View s responsibility Defining the Template Let s do a login view, with name and password fields and a login button (We work with this form in 4) Create a LoginFormViewuixml file in the same directory as LoginFormViewjava, with the following contents:
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< 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'> <g:HTMLPanel> <table> <tr> <td><g:Label text="User Name:"/></td> <td><g:TextBox u:field='nameTextBox'/></td> </tr> <tr> <td><g:Label text="Password:"/></td> <td><g:PasswordTextBox u:field='passwordTextBox'/></td> </tr> <tr> <td></td> <td><g:Button text='Login' u:field='loginButton'/></td> </tr> </table> </g:HTMLPanel> </u:UiBinder>
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(An aside: If you use Eclipse, you can create this file and the corresponding Java code by selecting File, New, UiBinder (See Figure 54) Similarly, to edit an already created template, right-click it and pick Open with, UI Template Editor)
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Figure 54 The newest GWT Plugin for Eclipse enables you to create
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Now, back to the template Its first line (< xml) just declares the file type and encoding, in usual XML way The second line (<!DOCTYPE) includes a whole bunch of <!ENTITY definitions, for all HTML standard entities such as   or á12 XML doesn t know about HTML, so excluding this line will cause an Error parsing XML (line 8): The entity "nbsp" was referenced, but not declared message, and your code won t run13 The third line (<u:UiBinder) not only defines the root element for the XML document, but also defines a namespace prefix (g, as in xmlsn:g) that implies that all the classes in the comgooglegwtuserclientui package can be used as elements, by combining the defined prefix with the Java class name and writing something such as g:TextBox or g:Button14
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12 You can find a complete list of HTML entities at wwww3org/TR/html5/named-characterreferenceshtml but check before at http://dlgooglecom/gwt/DTD/xhtmlent to make sure it s included 13 The contents of this file are included in the compiler, so GWT won t have to connect to the Internet to compile your UI definition 14 Note that the other namespace definition ("u") enables you to use the UiBinder class itself
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(In this example, we use HTMLPanel because it enables mixing HTML code and widgets; if you just needed the former, you could go with HTML You can use HTML code only with panels that implement the HasHTML interface) The u:field attribute makes available the widget through the given name and relates it to a corresponding @UiField annotation; more on this, next Note that this also applies to DOM elements; if you define <span u:field='mySpan'/> you can define @UiField SpanElement mySpan and use it as in mySpansetInnerText("some text") You can also define or include CSS styles with u:style, but most probably you won t be using that, because it s unlikely you will want to define particular, specific styles for a view, instead of using a general CSS file for the complete application the same reason why inline styles are not desired, and overall styles are preferred15 Defining the Java Side Let s now turn to the Java part We need to declare to which template we ll be binding our code, which objects are to be used as widgets in it, and what handlers shall be attached to events
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public class LoginFormView { @UiTemplate("LoginFormViewuixml") interface Binder extends UiBinder<HTMLPanel, LoginFormView> {} private static final Binder binder= GWTcreate(Binderclass); @UiField TextBox nameTextBox; @UiField PasswordTextBox passwordTextBox; @UiField Button loginButton; public LoginFormView() { HTMLPanel dlp= bindercreateAndBindUi(this); initWidget(dlp); } // any other methods }
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The @UiTemplate annotation lets you define the corresponding template file; by default, the same name of the class (so in this case the annotation isn t actually needed) but ending with uixml instead of java, is usedYou must extend the UiBinder<U,O> generic interface: U represents the generated widget class (in this case, HTMLPanel as we saw in the template) and O stands for the owning class (the class we are defining right now) Finally, you must GWTcreate() an instance of your interface (another case of deferred binding, which we saw in 4) which will be bound to the UiBinder created object when you call its createAndBindUi(this) method
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15 Okay, if you really insist on applying styles for each template, check http://codegooglecom/ webtoolkit/doc/latest/DevGuideUiBinderhtml#Hello_Stylish_World for a description of the style element
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