如何在GWT平台中将参数传递给UiBinder的构造器视图（通过使用setInSlot）？

Question

很难找到有关GWTP（GWT平台）的问题。

好的，这是我的故事。我正在使用GWTP & eclipse自动创建Presenter-View结构。

实施例中，我创建在eclipse一个TestPresenter，&它创建的3个文件：TestPresenter.java，TestView.java，TestView.xml

在TestView.xml，我有：

<g:RadioButton ui:field="firstRadioButton" value="false" text="1st" /> 

    <g:RadioButton ui:field="secondRadioButton" value="false" text="2nd" /> 

    <g:RadioButton ui:field="bothRadioButton" value="true" text="Both" /> 

现在我想每个TestView自动设置组名，所以在TestView.java

public class TestView extends ViewImpl implements 
     TestPresenter.MyView { 
    private final Widget widget; 
    @UiField RadioButton firstRadioButton; 
    @UiField RadioButton secondRadioButton; 
    @UiField RadioButton bothRadioButton; 
    private String groupName; 
    @UiFactory 
    RadioButton makeRadioButton() { 
     return new RadioButton(groupName); 
    } 
    public interface Binder extends UiBinder<Widget, TestView> { 
    } 

    @Inject 
    public TestView(final Binder binder) { 
     widget = binder.createAndBindUi(this); 
    } 

    @Override 
    public Widget asWidget() { 
     return widget; 
    } 

    public RadioButton getFirstRadioButton() { 
     return firstRadioButton; 
    } 

    public RadioButton getSecondRadioButton() { 
     return secondRadioButton; 
    } 

    public RadioButton getBothRadioButton() { 
     return bothRadioButton; 
    } 
} 

在TestPresenter.java，

public class TestPresenter extends 
     PresenterWidget<TestPresenter.MyView> { 

    public interface MyView extends View { 

     public RadioButton getFirstRadioButton(); 

     public RadioButton getSecondRadioButton(); 

     public RadioButton getBothRadioButton(); 
    } 
} 

好，最后我想在MainPresenter.java

使用许多TestPresenter（通过使用setInLot）所以，在MainPresenter.java，我有：

public static final Object SLOT1=new Object(); 
    public static final Object SLOT2=new Object(); 
    public static final Object SLOT3=new Object(); 
    public static final Object SLOT4=new Object(); 

//...... more lot 

    @Inject TestPresenter testPresenter1;  
    @Inject TestPresenter testPresenter2; 
    @Inject TestPresenter testPresenter3; 
    @Inject TestPresenter testPresenter4; 
//.. more test presenter 

在MainView.java

，我已经setInSlot

@UiField HTMLPanel mainHtmlPanel; 
@Override 
public void setInSlot(Object slot, Widget content){ 
     if(slot==MainPresenter.SLOT1){ 
      mainHtmlPanel.clear(); 
      if(content!=null){ 
       mainHtmlPanel.add(content); 
      } 
     } 
     else if(slot==MainPresenter.SLOT2){ 
      mainHtmlPanel.clear(); 
      if(content!=null){ 
       mainHtmlPanel.add(content); 
      } 
     } 
    //... more else if here 
} 

现在，如果我只是做这样的话，我不能单独通过组名每个TestPresenter &那不好。所以我想为每个TestPresenter传递groupName字符串，以便每个都有自己的groupName。这样的东西

@Inject TestPresenter testPresenter1 ("group1"); 

    @Inject TestPresenter testPresenter2 ("group2"); 

    @Inject TestPresenter testPresenter3 ("group3"); 
    @Inject TestPresenter testPresenter4 ("group4"); 
... 

但我不知道如何正确，所以请告诉我如何正确地在GWTP？

Answer 1

好的，我没有测试Alexis的解决方案，但他的想法“setGroupName”触发我的思想，所以我可以调整我的代码升技&它工作正常。

在TestPresenter.java，我有这样的方法

public void setGroupName(String groupName) { 
     getView().getFirstRadioButton().setName(groupName); 
     getView().getSecondRadioButton().setName(groupName); 
     getView().getBothRadioButton().setName(groupName); 
    } 

在MainPresenter.java

@Inject TestPresenter testPresenter1;  
@Inject TestPresenter testPresenter2; 
.... 
@Override 
protected void onReset() { 
     super.onReset(); 
    setInSlot(SLOT1, testPresenter1); 
    setInSlot(SLOT2, testPresenter2); 
    ..... 
    testPresenter1.setGroupName("group1"); 
    testPresenter2.setGroupName("group2"); 
    .... 
} 

Answer 2

如果您想在TestPresenter的构造函数中指定groupName，您可能需要使用的是assisted injection"。

那么你很可能会落得这样的事情（我没有测试的代码）：

public interface TestPresenterFactory { 
    TestPresenter create(String groupName); 
} 

，并在您的杜松子酒模块：

@Override 
protected void configure() { 
    ... 
    install(new GinFactoryModuleBuilder().build(TestPresenterFactory.class)); 
} 

然后，而不是：

@Inject TestPresenter testPresenter1 ("group1"); 
@Inject TestPresenter testPresenter2 ("group2"); 
@Inject TestPresenter testPresenter3 ("group3"); 
@Inject TestPresenter testPresenter4 ("group4"); 
... 

你会注入TestPresenterFactory in ParentPresenter的构造函数来创建所有TestPresenters：

private TestPresenter testPresenter1; 
private TestPresenter testPresenter2; 
private TestPresenter testPresenter3; 
private TestPresenter testPresenter4; 

@Inject 
public ParentPresenter(final EventBus eventBus, final ParentView view, final ParentProxy proxy, final TestPresenterFactory factory) 
{ 
    ... 
    testPresenter1 = factory.create("group1"); 
    testPresenter2 = factory.create("group2"); 
    testPresenter3 = factory.create("group3"); 
    testPresenter4 = factory.create("group4"); 
} 

而且@Assisted标注在TestPresenter.java：

public interface MyView extends View { 
    ... 
    public void setRadioButtonsGroupName(String groupName); 
} 

@Inject 
public TestPresenter(final EventBus eventBus, final MyView view, @Assisted String groupName) 
{ 
    ... 
    view.setRadioButtonsGroupName(groupName); 
} 

而且TestView。java的：

public class TestView extends ViewImpl implements TestPresenter.MyView { 
    private final Widget widget; 
    @UiField RadioButton firstRadioButton; 
    @UiField RadioButton secondRadioButton; 
    @UiField RadioButton bothRadioButton; 

    ... 

    public void setRadioButtonsGroupName(String groupName) { 
     firstRadioButton.setName(groupName); 
     secondRadioButton.setName(groupName); 
     bothRadioButton.setName(groupName); 
    } 
} 

但你真的需要你的TestPresenters要知道在他们的观点中使用的单选按钮组名为的？