我刚刚扩展了Vaadin的导航器,并覆盖了一些方法:
public class MyNavigator extends Navigator {
final SpringViewProvider viewProvider;
public MyNavigator(UI ui, SingleComponentContainer container, SpringViewProvider viewProvider) {
super(ui, container);
this.viewProvider = viewProvider;
addProvider(this.viewProvider);
}
@Override
public void navigateTo(String navigationState) {
if(ViewTokens.AVAILABLE_TOKENS.contains(navigationState)) {
if(viewProvider.getView(navigationState) == null) {
String uriFragment = parseViewToken();
if(uriFragment.equals(navigationState)) {
super.navigateTo(ViewTokens.HOME);
}
} else {
//if nothing found, redirect
super.navigateTo(ViewTokens.HOME);
}
}
}
private String parseViewToken() {
<ommitted>
}
}
这就是我设置Navigator的方法:
@SpringUI(path="/")
@Theme(ValoTheme.THEME_NAME)
public class MyFancyUI extends UI {
@Autowired
SpringViewProvider viewProvider;
@Override
protected void init(VaadinRequest vaadinRequest) {
MyNavigator navigator = new MyNavigator(UI.getCurrent(), this, viewProvider);
setNavigator(navigator);
navigator.navigateTo(ViewTokens.SIGNIN);
}
}
这就是我试图获取导航器并将视图重定向到另一个视图的方式:
@UIScope
@SpringView(name=ViewTokens.HOME)
public class SplashScreen extends VerticalLayout implements View {
private ComponentHelper componentHelper;
private Button toLoginPage;
public SplashScreen() {
initComponents();
buildSplashView();
}
protected void initComponents() {
componentHelper = ComponentHelper.getInstance();
toLoginPage = componentHelper.createFriendlyButton("To Login Page",220, 60);
toLoginPage.addClickListener(this::redirect);
}
private void buildSplashView() {
addComponent(toLoginPage);
setComponentAlignment(toLoginPage, Alignment.MIDDLE_CENTER);
setHeight(100, Unit.PERCENTAGE);
}
public void redirect(Button.ClickEvent event) {
getUI().getNavigator().navigateTo(ViewTokens.SIGNIN);
}
@Override
public void enter(ViewChangeListener.ViewChangeEvent viewChangeEvent){
}
}
由于某种原因,按钮不会对点击事件做出反应。
更换为标准导航器 - 它可以工作。
我做错了什么?
感谢您的建议
答案 0 :(得分:1)
我原本以为你可以使用Vaadin的Navigator和这样的View Change Listener:
navigator.addViewChangeListener(new ViewChangeListener() {
@Override
public boolean beforeViewChange(ViewChangeEvent event) {
// check you're happy to change
if (ViewTokens.AVAILABLE_TOKENS.contains(navigationState)) {
if (viewProvider.getView(event.getViewName()) == null) {
String uriFragment = parseViewToken();
if (uriFragment.equals(event.getViewName())) {
navigator.navigateTo(ViewTokens.HOME);
return false;
}
} else {
// if nothing found, redirect
navigator.navigateTo(ViewTokens.HOME);
return false;
}
// Let the view change happen.
return true;
}
}
@Override
public void afterViewChange(ViewChangeEvent event) {
}
});
如果你在beforeViewChange中返回false,它将停止发生视图更改。