我用：
约束验证后，我想显示错误消息。这由 gwt 材料输入支持，例如MaterialTextBox使用方法： materialTextBox.setError("Please provide your name");
问题是它只能从视图类执行：
public class LoginView extends ViewWithUiHandlers<LoginUiHandlers> implements LoginPresenter.MyView {
interface Binder extends UiBinder<Widget, LoginView> {}
/** The driver to link the proxy bean with the view. */
public interface EditorDriver extends SimpleBeanEditorDriver<LoginModel, LoginView> { }
@UiField MaterialTextBox email;
@UiField MaterialTextBox password;
@UiField MaterialButton loginButton;
@UiField MaterialCheckBox keepMeLoggedInCheckbox;
@Inject
LoginView(Binder uiBinder) {
initWidget(uiBinder.createAndBindUi(this));
addClickHandlerToLoginButton();
}
//@UiHandler("loginButton")
private void onLoginButtonClick(ClickEvent e){
getUiHandlers().onLoginButtonClick();
}
private void addClickHandlerToLoginButton() {
loginButton.addClickHandler(new ClickHandler() {
@Override public void onClick(ClickEvent event) {
onLoginButtonClick(event);
}
});
}
@Override
public SimpleBeanEditorDriver<LoginModel, ?> createEditorDriver() {
EditorDriver driver = GWT.create(EditorDriver.class);
driver.initialize(this);
return driver;
}
public void test() {}
}
但是我在 中执行了所有编辑器/验证操作Presenter，并且没有可以使用的任何 View 连接：
public class LoginPresenter extends Presenter<LoginPresenter.MyView, LoginPresenter.MyProxy> implements LoginUiHandlers {
public interface MyView extends BeanEditView<LoginModel>, HasUiHandlers<LoginUiHandlers> {}
public static final Type<RevealContentHandler<?>> SLOT_Login = new Type<RevealContentHandler<?>>();
@ProxyStandard
@NameToken(NameTokens.login)
public interface MyProxy extends ProxyPlace<LoginPresenter> {}
// Editor
private SimpleBeanEditorDriver<LoginModel, ?> editorDriver;
private static final LoginService service = GWT.create(LoginService.class);
private LoginModel model = new LoginModel("","");
@Override
public void onLoginButtonClick() {
if (editorDriver.isDirty()) {
model = editorDriver.flush();
validateModel();
if (editorDriver.hasErrors()) {
MaterialToast.fireToast("Errors occur");
StringBuilder errorBuilder = new StringBuilder();
for (EditorError error : editorDriver.getErrors()) {
errorBuilder.append(error.getMessage() + "\n");
}
MaterialToast.fireToast(errorBuilder.toString());
} else {
service.login(
model, new MethodCallback<Integer>() {
@Override
public void onSuccess(Method method, Integer response) {
MaterialToast.fireToast("Succefully set info. status code: " + response);
}
@Override
public void onFailure(Method method, Throwable exception) {
MaterialToast.fireToast("Error setting");
}
});
}
} else {
MaterialToast.fireToast("Data has not changed");
}
}
private void validateModel() {
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<LoginModel>> violations = validator.validate(model);
if (violations.size() > 0) {
editorDriver.setConstraintViolations(new ArrayList<ConstraintViolation<?>>(violations));
}
}
@Inject
LoginPresenter(EventBus eventBus,MyView view, MyProxy proxy) {
super(eventBus, view, proxy, RevealType.Root);
getView().setUiHandlers(this);
editorDriver = getView().createEditorDriver();
editorDriver.edit(model);
}
}
我认为我应该添加一个接口，我将在其中声明访问视图输入的方法。并执行该操作。但我不知道怎么做。请帮我。