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Navigator類：爲什麼vaadin複製View的方法調用？
@CDIUI
@Title("RUT — Remote University Tool")
public class NavigatorUI extends UI {
public static final String MAINVIEW = MainView.NAME;
@EJB
private TestCRUDService testCRUDService;
@EJB
private DisciplineService disciplineService;
@Override
protected void init(VaadinRequest request) {
CreateQuestionsPoolView createQuestionsPoolView = new CreateQuestionsPoolView();
createQuestionsPoolView.setTestCRUDService(testCRUDService);
createQuestionsPoolView.setDisciplineService(disciplineService);
MainView mainView = new MainView();
Navigator navigator = new Navigator(this, this);
navigator.addView(CreateQuestionsPoolView.NAME, createQuestionsPoolView);
navigator.addView(MainView.NAME, mainView);
navigator.navigateTo(MAINVIEW);
}
}
的MainView：
public class MainView extends VerticalLayout implements View {
public static final String NAME = "main";
private Button openCreateQuestionPoolViewButton = new Button("Создать тестовое задание");
@Override
public void enter(ViewChangeListener.ViewChangeEvent event) {
addComponent(openCreateQuestionPoolViewButton);
final Navigator NAVIGATOR = event.getNavigator();
openCreateQuestionPoolViewButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
NAVIGATOR.navigateTo(CreateQuestionsPoolView.NAME);
}
});
}
}
我的View實現：
public class CreateQuestionsPoolView extends VerticalLayout implements View {
public static final String NAME = "test-creation";
private Logger logger = Logger.getLogger(CreateQuestionsPoolView.class.getName());
// ------------ main layout
private TextField poolThemeField = new TextField("Тема");
private TextField branchIdField = new TextField("Группа");
private TextField disciplineField = new TextField("Дисциплина");
private Button addQuestionButton = new Button("Добавить вопрос");
private Button exportPoolButton = new Button("Экспортировать вопросы");
private Button createQuestionsPoolButton = new Button("Создать новый тест");
private Button saveQuestionsPoolButton = new Button("Сохранить тест");
private Button openMainUIButton = new Button("Вернуться на стартовую страницу");
// ------------ question layout
private Layout questionLayout;
private TextArea questionTitle = new TextArea("Вопрос");
private TextArea[] answers = {
new TextArea("Вариант ответа 1"),
new TextArea("Вариант ответа 2"),
new TextArea("Вариант ответа 3"),
new TextArea("Вариант ответа 4")
};
private CheckBox[] isCorrectAnswerCheckboxes = {
new CheckBox("Правильный"),
new CheckBox("Правильный"),
new CheckBox("Правильный"),
new CheckBox("Правильный")
};
private Button saveQuestionButton = new Button("Сохранить вопрос");
// ------------ download layout
private Layout downloadLayout;
private Button downloadButton = new Button("Скачать");
// ------------ shared data
private QuestionsPool questionsPool;
private Navigator navigator;
private TestCRUDService testCRUDService;
private DisciplineService disciplineService;
@Override
public void enter(ViewChangeListener.ViewChangeEvent event) {
logger.info("View will be initialized now");
initMainLayout();
initQuestionLayout();
initDownloadLayout();
navigator = event.getNavigator();
}
public void setTestCRUDService(TestCRUDService testCRUDService) {
logger.info("TestCRUDService set up");
this.testCRUDService = testCRUDService;
}
public TestCRUDService getTestCRUDService() {
logger.info("TestCRUDService requested");
return testCRUDService;
}
public void setDisciplineService(DisciplineService disciplineService) {
logger.info("disciplineService set up");
this.disciplineService = disciplineService;
}
public DisciplineService getDisciplineService() {
logger.info("disciplineService requested");
return disciplineService;
}
private void initDownloadLayout() {
logger.info("Download layout initialization");
downloadLayout = new GridLayout();
downloadLayout.setVisible(false);
downloadLayout.addComponent(downloadButton);
addComponent(downloadLayout);
}
private void initQuestionLayout() {
logger.info("Question layout initialization");
questionLayout = new GridLayout();
questionLayout.setSizeFull();
questionLayout.setVisible(false);
questionLayout.addComponent(questionTitle);
questionTitle.setWidth("100%");
for (int i = 0; i < answers.length; i++) {
HorizontalLayout horizontalLayout = new HorizontalLayout();
horizontalLayout.addComponent(answers[i]);
horizontalLayout.addComponent(isCorrectAnswerCheckboxes[i]);
horizontalLayout.setWidth("100%");
horizontalLayout.setHeight("20%");
questionLayout.addComponent(horizontalLayout);
answers[i].setWidth("90%");
answers[i].setHeight("100%");
}
questionLayout.addComponent(saveQuestionButton);
saveQuestionButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
Question question = new Question(questionTitle.getValue());
for (int i = 0; i < answers.length; i++) {
question.getAnswers().put(
new Answer(answers[i].getValue()), isCorrectAnswerCheckboxes[i].getValue()
);
}
questionsPool.getQuestions().add(question);
Notification.show("Вопрос сохранен", Notification.Type.TRAY_NOTIFICATION);
questionLayout.setVisible(false);
}
});
addComponent(questionLayout);
}
private void initMainLayout() {
logger.info("Main layout initialization");
setWidth("100%");
addComponent(poolThemeField);
addComponent(branchIdField);
addComponent(disciplineField);
HorizontalLayout buttonsLayout = new HorizontalLayout();
buttonsLayout.addComponent(addQuestionButton);
buttonsLayout.addComponent(exportPoolButton);
buttonsLayout.addComponent(createQuestionsPoolButton);
buttonsLayout.addComponent(saveQuestionsPoolButton);
buttonsLayout.addComponent(openMainUIButton);
addComponent(buttonsLayout);
addQuestionButton.setVisible(false);
exportPoolButton.setVisible(false);
addQuestionButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
logger.info("Add question button pressed");
for (int i = 0; i < answers.length; i++) {
answers[i].setValue("");
isCorrectAnswerCheckboxes[i].setValue(false);
}
questionTitle.setValue("");
questionLayout.setVisible(true);
}
});
exportPoolButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
logger.info("Export pool button pressed");
String serializedPool = JsonTransformer.toString(questionsPool);
downloadLayout.setVisible(true);
FileDownloader fileDownloader = new FileDownloader(createResource(serializedPool));
fileDownloader.extend(downloadButton);
}
});
createQuestionsPoolButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
logger.info("Create pool button pressed");
questionsPool = new QuestionsPool(poolThemeField.getValue());
questionsPool.setBranchId(Integer.valueOf(branchIdField.getValue()));
questionsPool.setQuestions(new ArrayList<Question>());
addQuestionButton.setVisible(true);
exportPoolButton.setVisible(true);
}
});
saveQuestionButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
logger.info("Save question button pressed");
testCRUDService.addQuestionsPool(
questionsPool, disciplineService.getDisciplineByName(disciplineField.getValue()));
}
});
openMainUIButton.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent event) {
logger.info("Back to main UI button pressed");
navigator.navigateTo(NavigatorUI.MAINVIEW);
}
});
}
}
應用從NavigatorUI類開始，然後導航到MAINVIEW。我導航到CreateQuestionsPoolView。 當我調用View的任何方法時，調用重複。我是Vaadin的新手，無法理解其原因。
Vaadin 7.0.5，Glassfish的4