如何在GWT平台中(使用setInSlot)将参数传递到UiBinder的Constructor视图中

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视图结构。

例如，我在eclipse中创建了一个TestPresenter；它创建了3个文件：TestPresenter.java、TestView.java、TestView.xml

在TestView.xml中，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" /> 

现在我想为每个TestView自动设置GroupName，所以在TestView.java 中

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中，

public class TestPresenter extends
PresenterWidget<TestPresenter.MyView> {
public interface MyView extends View {
public RadioButton getFirstRadioButton();
public RadioButton getSecondRadioButton();
public RadioButton getBothRadioButton();
}
}

好的，最后我想在MainPresenter.java 中使用许多TestPresenter(通过使用setInLot)

因此，在MainPresenter.java中，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中，我设置了InSlot

@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，如果我只是这样做，那么我不能为每个TestPresenter&这不好。因此，我想为每个TestPresenter传递groupName字符串，这样每个人都有自己的groupName。有点像这个

@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使用它，所以请告诉我如何在GWTP中正确使用它？

Answer 1

如果你想在TestPresenter的构造函数中指定一个groupName，为什么你可能需要使用辅助注入

然后你可能会得到这样的东西(我还没有测试代码)：

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

和您的杜松子酒模块：

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

然后代替：

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

您将在ParentPresenter的构造函数中注入TestPresenterFactory以创建所有TestPresenter:

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");
}

以及TestPresenter.java:中的@Assisted注释

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);
}

和TestView.java:

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);
}
}

但是，您真的需要您的TestPresenter了解RadioButtons在其视图中使用的groupName吗？

Answer 2

好吧，我还没有测试Alexis的解决方案，但他关于"setGroupName"的想法触发了我的想法，这样我就可以调整我的代码了；它运行良好。

在TestPresenter.java中，我有这个方法

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

在MainPresenter.java 中

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