用两个不同的值绑定标签-javafx [英] Bind label with two different values-javafx

问题描述

我有一个实时的javafx用户应用程序，该应用程序的标签为:No of answers/No of questions， 用户回答问题时，答案的数量会增加，而一堂课向用户提出问题时，问题的数量会增加.

I have a live javafx user application which has a label : No of answers/No of questions , No of answers increases as the user answers the question, and number of questions increases as one class throws questions to user.

标签最初看起来像-0/0

我想将两个不同的变量(NumberOfAnswers, NumberOfQuestions)绑定到此标签，例如，如果我向用户抛出10个问题，并且用户回答了2个问题，则它应该类似于:2/10

I want to bind two different variables (NumberOfAnswers, NumberOfQuestions) to this label, say if I have 10 questions thrown to user and user has answered 2 it should look like : 2/10

Label ansQuestLbl = new Label("0/0");
    if (answerConnector!= null) {
        log.info("Going to bind , No of answers: "+answerConnector.getNoOfAnswers());
        ansQuesLbl.textProperty().bind(answerConnector.getNoOfAnswers().asString());
        log.info("Bound number of answers with label on UI");
    }

这仅将答案数"绑定到标签.

This only binds Number of answers to the label.

提前谢谢.

推荐答案

所有您需要的是 Bindings.concat(Object... args) :

All you need is Bindings.concat(Object... args):

例如:

IntegerProperty noOfAnswers = answerConnector.noOfAnswersProperty();
IntegerProperty noOfQuestions = answerConnector.noOfQuestionsProperty();
ansQuesLbl.textProperty().bind(Bindings.concat(noOfAnswers, "/", noOfQuestions));

或者:

IntegerProperty noOfAnswers = answerConnector.noOfAnswersProperty();
IntegerProperty noOfQuestions = answerConnector.noOfQuestionsProperty();
ansQuesLbl.textProperty().bind(noOfAnswers.asString().concat("/").concat(noOfQuestions.asString()));

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注意:为避免属性出现问题，我将建议您遵循javafx命名约定，以便answerConnector的类应如下所示:

---

Note: To avoid problems with the Properties I would recommand to follow the javafx naming convention, so that the class for answerConnector should look like this:

public class AnswerConnector {
    private final IntegerProperty noOfAnswers = new SimpleIntegerProperty(0);

    public IntegerProperty noOfAnswersProperty() {
        return noOfAnswers;
    }

    public int getNoOfAnswers() {
        return noOfAnswers.get();
    }

    public void setNoOfAnswers(int noOfAnswers) {
        this.noOfAnswers.set(noOfAnswers);
    }

    // same for noOfQuestions
}

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