如何使用 setCellFactory 根据对象属性的内容定义单元格的内容？ [关闭]

Question

我有一个名为“ChatMessage”的对象，它有 3 个属性：

a) timeOfMessage
b) sentOrReceived
c) message

有了它，我可以创建许多聊天消息，并将其存储在 ChatMessages 列表中。 我已经定义了一个 tableView，3 个 tableColumns（用于 a、b 和 c），如下所示：

//------------------------
//Step 1: Define tableView
//------------------------
@FXML private TableView<ChatMessage> tableViewAllMessages;

//---------------------------
//Step 2: Define table's data
//---------------------------
private ObservableList<ChatMessage> allMessagesList;

//--------------------------------
//Step 3: Define table's 3 columns
//--------------------------------
@FXML private TableColumn<ChatMessage, LocalDateTime> col1_Time;
@FXML private TableColumn<ChatMessage, Boolean> col2_sentOrReceived;
@FXML private TableColumn<ChatMessage, String> col3_Message;

//---------------------------------
//Step 4: Using setCellValueFactory
//---------------------------------
col1_Time.setCellValueFactory(new PropertyValueFactory<ChatMessage,LocalDateTime>("dateTime"));
col2_sentOrReceived.setCellValueFactory(new PropertyValueFactory<ChatMessage, Boolean>("sentOrReceived"));
col3_Message.setCellValueFactory(new PropertyValueFactory<ChatMessage,String>("message"));
tableViewAllMessages.setItems(allMessagesList);

一切正常！ 但是，我想根据它返回的真/假，将当前为布尔值的 col2_sentOrReceived（在步骤 2 中）转换为字符串值。 有没有办法让单元格在布尔值为假时写 X 和在布尔值为真时写 Y？ 我需要在这里更改什么：

col2_sentOrReceived.setCellValueFactory(new PropertyValueFactory<ChatMessage, Boolean>("sentOrReceived"));

或者可以添加这样的一行：

col2_sentOrReceived.setCellFactory(/* But what to write here? */);

?

//-----------------------------
//Here is my ChatMessage Class:
//-----------------------------
public class ChatMessage {
    //11111111111111111111111111
    //11111111111111111111111111
    // ----- CLASS FIELDS  -----
    private Customer customer;
    private int messageNumber;
    private LocalDateTime dateTime;
    private String message;
    private boolean sentOrReceived;

    //22222222222222222222222222222222222222222
    //22222222222222222222222222222222222222222
    //22222222222222222222222222222222222222222
    //----------  Temp Creation  --------------
    //----------  Temp Creation  --------------
    public ChatMessage(Customer customer, int messageNumber, LocalDateTime dateTime, String message, boolean sentOrReceived) {
        this.customer = customer;
        this.messageNumber = messageNumber;
        this.dateTime = dateTime;
        this.message = message;
        this.sentOrReceived = sentOrReceived; //Assumming one side is always me.
    }
}

Answer 1

感谢色拉的评论！它引导我朝着正确的方向前进。 我实现了我自己的工厂，它按照您的建议仅使用 lambda 表达式映射值。这就是我一直在寻找的答案：

col2_Nickname.setCellFactory(lambda -> new TableCell<ChatMessage, Boolean>() {
            @Override
            public void updateItem(Boolean sentOrReceived, boolean empty) {
                super.updateItem(sentOrReceived, empty);
                if (empty) {
                    setText(null);
                }else{
                    setText(sentOrReceived ? "MyNickname" : "His/Her nickname");
                }
            }
        });