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我使用 javafx2 控件 TableView 来显示数据库中的记录（我现在有 20 条记录）。当显示记录时，我想在每一行中添加按钮。所以我用谷歌搜索了很多文章，并在下面写了一些代码。

关键代码是：

    protected void updateItem(Long item, boolean empty) {
    super.updateItem(item, empty);
    if(empty) {
        setText(null);
        setGraphic(null);
    } else {
        final Button button = new Button("modifty");
        setGraphic(button);
        setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
    }
}

我调试这段代码，参数“empty”永远不会是“false”，所以按钮永远不会显示在表格视图中，

谁能帮我？谢谢

下面是完整的代码（java 和 fxml）：

爪哇：

    package com.turbooo.restaurant.interfaces.javafx;

import java.io.IOException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.ResourceBundle;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.util.Callback;

import com.turbooo.restaurant.domain.Customer;
import com.turbooo.restaurant.domain.CustomerRepository;
import com.turbooo.restaurant.interfaces.facade.dto.CustomerDto;
import com.turbooo.restaurant.interfaces.facade.dto.assembler.CustomerDtoAssembler;
import com.turbooo.restaurant.util.ContextHolder;
import com.turbooo.restaurant.util.UTF8Control;

public class CustomerController implements Initializable {

    @FXML
    private TableView<CustomerDto> customerTableView;

    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {


        TableColumn<CustomerDto, Long> idCol = new TableColumn<CustomerDto, Long>("id");
        idCol.setCellValueFactory(
            new PropertyValueFactory<CustomerDto,Long>("id")
        );

        TableColumn<CustomerDto, String> nameCol = new TableColumn<CustomerDto, String>("name");
        nameCol.setMinWidth(100);
        nameCol.setCellValueFactory(
            new PropertyValueFactory<CustomerDto,String>("name")
        );

        TableColumn<CustomerDto, String> birthdayCol = new TableColumn<CustomerDto, String>("birthday");
        birthdayCol.setCellValueFactory(
                new Callback<TableColumn.CellDataFeatures<CustomerDto, String>, ObservableValue<String>>() {
                    @Override
                    public ObservableValue<String> call(TableColumn.CellDataFeatures<CustomerDto, String> customer) {
                        if (customer.getValue() != null) {
                            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                            return new SimpleStringProperty(sdf.format(customer.getValue().getBirthday()));
                        } else {
                            return new SimpleStringProperty("");
                        }
                    }
                });

        TableColumn<CustomerDto, Long> actionCol = new TableColumn<CustomerDto, Long>("action");
        actionCol.setCellFactory(
                new Callback<TableColumn<CustomerDto,Long>, TableCell<CustomerDto,Long>>() {
                    @Override
                    public TableCell<CustomerDto, Long> call(TableColumn<CustomerDto, Long> arg0) {
                        final TableCell<CustomerDto, Long> cell = new TableCell<CustomerDto, Long>() {
                            @Override
                            protected void updateItem(Long item, boolean empty) {
                                super.updateItem(item, empty);
                                if(empty) {
                                    setText(null);
                                    setGraphic(null);
                                } else {
                                    final Button button = new Button("modifty");
                                    setGraphic(button);
                                    setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
                                }
                            }
                        };

                        return cell;
                    }
                });


        //TODO add button column

        customerTableView.getColumns().addAll(idCol, nameCol, birthdayCol, actionCol);       

        loadData();

    }

    public void loadData() {
        CustomerRepository cusRepo = (CustomerRepository)ContextHolder.getContext().getBean("customerRepository");

        List<Customer> customers = cusRepo.findAll();
        CustomerDtoAssembler customerDTOAssembler = new CustomerDtoAssembler();
        List<CustomerDto> customerDtos = customerDTOAssembler.toDTOList(customers);

        ObservableList<CustomerDto> data = FXCollections.observableArrayList(customerDtos);
        customerTableView.setItems(data);        
    }


    public void showNewDialog(ActionEvent event) {
        ResourceBundle resourceBundle = ResourceBundle.getBundle(
                "com/turbooo/restaurant/interfaces/javafx/customer_holder",
                new UTF8Control());

        Parent container = null;
        try {
            container = FXMLLoader.load(
                    getClass().getResource("customer_holder.fxml"), 
                    resourceBundle);

        } catch (IOException e) {
            e.printStackTrace();
        }

        container.setUserData(this);    //pass the controller, so can access LoadData function in other place later

        Scene scene = new Scene(container, 400, 300);
        Stage stage = new Stage();
        stage.setScene(scene); 
        stage.initModality(Modality.APPLICATION_MODAL);
        stage.show();

    }
}

文件格式：

    <?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>

<BorderPane prefHeight="345.0" prefWidth="350.0" xmlns:fx="http://javafx.com/fxml" fx:controller="com.turbooo.restaurant.interfaces.javafx.CustomerController">
  <center>
    <TableView fx:id="customerTableView" prefHeight="200.0" prefWidth="200.0" />
  </center>
  <top>
    <HBox alignment="CENTER_LEFT" prefHeight="42.0" prefWidth="350.0">
      <children>
        <Button text="new" onAction="#showNewDialog"/>
        <Separator prefHeight="25.0" prefWidth="13.0" visible="false" />
        <Button text="modify" />
        <Separator prefHeight="25.0" prefWidth="15.0" visible="false" />
        <Button text="delete" />
      </children>
    </HBox>
  </top>
</BorderPane>
4

1 回答 1

2

您尚未为您的操作列设置 cellValueFactory，因此它始终为空。一个简单的方法就是将单元格值设置为记录的 id。

actionCol.setCellValueFactory(
    new PropertyValueFactory<CustomerDto,Long>("id")
);

此外，我创建了一个简单的示例来创建一个包含添加按钮的表格，如果需要，您可以参考。

于 2012-07-10T07:43:30.080 回答