Question

我试图找出如何在CustomListCell中使用ListView JavaFX，但没有运气，我已经抬头，我所能找到的都是不完整的教程和问题。以下是我的CustomListCell FXML

  <AnchorPane id="AnchorPane" styleClass="backPane" 
       stylesheets="@../css/mainwindow.css" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1">
  <children>
  <HBox alignment="CENTER_LEFT" styleClass="backPane">
     <children>
        <HBox styleClass="card" HBox.hgrow="ALWAYS">
           <children>
              <ImageView fitHeight="150.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true">
                 <image>
                    <Image url="@../images/picture_placeholder.png" />
                 </image>
              </ImageView>
              <VBox HBox.hgrow="ALWAYS">
                 <children>
                    <Label fx:id="lbTitle" styleClass="fixture-title" stylesheets="@../css/mainwindow.css" text=" Livingston 19:45 Falkirk" />
                    <Label fx:id="lbDescription" styleClass="fixture-description" text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin at turpis nisl. Interdum et malesuada fames ac ante ipsum primis in faucibus. Vestibulum laoreet elementum velit. Curabitur tincidunt finibus malesuada. Aliquam dapibus semper scelerisque. Sed tristique tellus eget sem ornare cursus." />
                 </children></VBox>
           </children>
           <HBox.margin>
              <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
           </HBox.margin>
        </HBox>
       </children>
      </HBox>
      </children>
    </AnchorPane>

我的模特

public class Ticket {


private long id;
private String imageUrl;
private String title;
private String description;

public Ticket(long id, String imageUrl, String title, String description) {
    this.id = id;
    this.imageUrl = imageUrl;
    this.title = title;
    this.description = description;
}

public long getId() {
    return id;
}

public void setId(long id) {
    this.id = id;
}

public String getImageUrl() {
    return imageUrl;
}

public void setImageUrl(String imageUrl) {
    this.imageUrl = imageUrl;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

}

我的不完整CustomListCell

public class TicketCell <Ticket> extends ListCell<Ticket> { 

private final TicketCellController ticketCellController = new TicketCellController();
private final Node view = ticketCellController.getView();

@Override
protected void updateItem(Ticket item, boolean empty) {
    super.updateItem(item, empty);
    if (empty) {
        setGraphic(null);
    } else {
        ticketCellController.setTicket(item);
        setGraphic(view);
    }
} 
}

我的控制器

public class TicketCellController implements Initializable{

private static final String TAG = MainWindowController.class.getSimpleName();
private Logger logger;
private Ticket ticket;
@FXML
private Label lbTitle;
@FXML
private Label lbDescription;
@FXML
private AnchorPane anchorPane;



@Override
public void initialize(URL url, ResourceBundle rb) {
  logger = Logger.getLogger(MainWindowController.class);
    BasicConfigurator.configure();  
}

请注意，ticketCellController.getView()未找到。此时丢失了，我不知道在我的CustomListCell FXML中更新imageview和标签的正确方法。任何人都可以提供帮助或链接到我可以关注的教程，我将不胜感激。

Answer 1

您设置的方式，实例化控制器并从中获取视图，您的控制器需要加载fxml并能够返回它创建的视图。如下所示：

public class TicketCellController {

    private Ticket ticket;
    @FXML
    private Label lbTitle;
    @FXML
    private Label lbDescription;

    private AnchorPane anchorPane;

    public TicketCellController() {

        try {
            // assumes FXML file is in same package as this controller
            // (also make sure name of FXML resource is correct)
            FXMLLoader loader = new FXMLLoader(getClass().getResource("CustomListCell.fxml"));
            loader.setController(this);
            anchorPane = loader.load();
        } catch (IOException exc) {
            // pretty much fatal here...
            throw new UncheckedIOException(exc);
        }
    }

    public void setTicket(Ticket ticket) {
        lbTitle.setText(ticket.getTitle());
        lbDescription.setText(ticket.getDescription());
    }

    public Node getView() {
        return anchorPane ;
    }

    // ...

}

这是一个测试类;这适用于上面的控制器类，以及你的FXML，CustomListCell类和模型类（我注意到我从FXML中删除了样式表和图像，因为我无法访问它们）：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.stage.Stage;

public class Test extends Application {

    @Override
    public void start(Stage primaryStage) {
        ListView<Ticket> ticketList = new ListView<Ticket>();
        ticketList.setCellFactory(lv -> new TicketCell());
        for (int i = 1 ; i <= 50 ; i++) {
            ticketList.getItems().add(new Ticket(i, "", "Ticket "+i, "This is a description of ticket "+i));
        }
        primaryStage.setScene(new Scene(ticketList, 600, 400));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Answer 2

几小时后，这解决了所有问题

public class TicketCell extends ListCell<Ticket> { 
private static final String TAG = TicketCell.class.getSimpleName();
private Logger logger;
private Ticket ticket;
@FXML
private Label lbTitle;
@FXML
private Label lbDescription;
@FXML
private AnchorPane anchorPane;  
private FXMLLoader mLLoader;

public TicketCell(){
    logger = Logger.getLogger(MainWindowController.class);
    BasicConfigurator.configure(); 
}


public void updateItem(Ticket pos,boolean empty){
super.updateItem(pos, empty);

if(pos == null){
setText(null);
setGraphic(null);
}else{

    if (mLLoader == null) {
            mLLoader = new FXMLLoader(getClass().getResource("/resources/fxml/TicketDesignCell.fxml"));
            mLLoader.setController(this);

            try {
                mLLoader.load();
            } catch (IOException e) {
                logger.error(TAG, e);
            }
logger.error(TAG + " Loading content: "+pos.getTitle());
}


    this.lbTitle.setText(pos.getTitle());
    this.lbDescription.setText(pos.getDescription());


    setText(null);
    setGraphic(anchorPane);


}

}

}

所有东西都必须在细胞类中

JavaFX使用自定义listcell

2 个答案: