Question

我正在尝试用Java创建一个程序来管理我的bookie帐户。我是java的新手，所以我想我会选择一些简单的东西来看看它是如何工作的。我决定使用tableview并使单个单元格可编辑。我一直在关注这个教程http://java-buddy.blogspot.co.uk/2012/04/javafx-2-editable-tableview.html。它详细介绍了如何使用java代码进行操作，并将其复制到新类中可以完美地运行。我决定尝试调整它以使用FXML，因为我喜欢Sceneviewer。我的问题是，数据被加载到表中，但当我单击/双击单元格时，没有任何反应。这是我的代码。

testController.java

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.util.Callback;

import java.net.URL;
import java.util.ResourceBundle;

public class testController implements Initializable {

@FXML
private TableColumn<Account, String> usernameCol;

@FXML
private TableColumn<Account, String> balanceCol;

@FXML
private TableView<Account> accountTable;

@FXML
private TableColumn<Account, String> bookieCol;

@FXML
private TableColumn<Account, String> passwordCol;

private ObservableList<Account> dataList =
        FXCollections.observableArrayList(
                new Account("bookie", "username", "password", "0"));


@Override
public void initialize(URL location, ResourceBundle resources) {
    Callback<TableColumn, TableCell> cellFactory =
            new Callback<TableColumn, TableCell>() {
                public TableCell call(TableColumn p) {
                    return new EditingCell();
                }
            };

    bookieCol.setCellValueFactory(
            new PropertyValueFactory<>("fieldBookie"));

    usernameCol.setCellValueFactory(
            new PropertyValueFactory<>("fieldUsername"));

    usernameCol.setOnEditCommit(
            new EventHandler<TableColumn.CellEditEvent<Account, String>>() {
                @Override public void handle(TableColumn.CellEditEvent<Account, String> t) {
                    ((Account)t.getTableView().getItems().get(
                            t.getTablePosition().getRow())).setFieldUsername(t.getNewValue());
                }
            });

    passwordCol.setCellValueFactory(
            new PropertyValueFactory<Account, String>("fieldPassword"));

    balanceCol.setCellValueFactory(
            new PropertyValueFactory<Account, String>("fieldBalance"));

    accountTable.setItems(dataList);

}

class EditingCell extends TableCell<Account, String> {

    private TextField textField;

    public EditingCell() {
    }

    @Override
    public void startEdit() {
        super.startEdit();

        if (textField == null) {
            createTextField();
        }

        setGraphic(textField);
        setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
        textField.selectAll();
    }

    @Override
    public void cancelEdit() {
        super.cancelEdit();

        setText(String.valueOf(getItem()));
        setContentDisplay(ContentDisplay.TEXT_ONLY);
    }

    @Override
    public void updateItem(String item, boolean empty) {
        super.updateItem(item, empty);

        if (empty) {
            setText(null);
            setGraphic(textField);
        } else {
            if (isEditing()) {
                if (textField != null) {
                    textField.setText(getString());
                }
                setGraphic(textField);
                setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
            } else {
                setText(getString());
                setContentDisplay(ContentDisplay.TEXT_ONLY);
            }
        }
    }

    private void createTextField() {
        textField = new TextField(getString());
        textField.setMinWidth(this.getWidth() - this.getGraphicTextGap() * 2);
        textField.setOnKeyPressed(t -> {
            if (t.getCode() == KeyCode.ENTER) {
                commitEdit(textField.getText());
            } else if (t.getCode() == KeyCode.ESCAPE) {
                cancelEdit();
            }
        });
    }

    private String getString() {
        return getItem() == null ? "" : getItem();
    }
}
}

这是我的Account.java文件。

import javafx.beans.property.SimpleStringProperty;


public class Account {
    private SimpleStringProperty fieldBookie;
    private SimpleStringProperty fieldUsername;
    private SimpleStringProperty fieldPassword;
    private SimpleStringProperty fieldBalance;

    Account(String fbookie, String fusername, String fpassword, String fbalance){
        this.fieldBookie = new SimpleStringProperty(fbookie);
        this.fieldUsername = new SimpleStringProperty(fusername);
        this.fieldPassword = new SimpleStringProperty(fpassword);
        this.fieldBalance = new SimpleStringProperty(fbalance);
    }

    public String getFieldBookie() {
        return fieldBookie.get();
    }

    public String getFieldUsername() {
        return fieldUsername.get();
    }

    public String getFieldPassword() {
        return fieldPassword.get();
    }

    public String getFieldBalance() {
        return fieldBalance.get();
    }

    public void setFieldBookie(String fBookie) {
        fieldBookie.set(fBookie);
    }

    public void setFieldUsername(String fUsername) {
        fieldUsername.set(fUsername);
    }

    public void setFieldPassword(String fPassword) {
        fieldUsername.set(fPassword);
    }

    public void setFieldBalance(String fBalance) {
        fieldUsername.set(fBalance);
    }

}

最后，这是我的fxml文件。

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

<?import javafx.scene.control.*?>
<?import javafx.scene.canvas.*?>
<?import java.lang.*?>
<?import javafx.scene.*?>

<Group xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="testController">
   <children>
      <TableView fx:id="accountTable" editable="true" prefHeight="291.0" prefWidth="302.0">
        <columns>
          <TableColumn fx:id="bookieCol" prefWidth="75.0" text="Bookie" />
          <TableColumn fx:id="usernameCol" prefWidth="75.0" text="Username" />
            <TableColumn fx:id="passwordCol" prefWidth="75.0" text="Password" />
            <TableColumn fx:id="balanceCol" prefWidth="75.0" text="Balance" />
        </columns>
      </TableView>
   </children>
</Group>

正如我之前所说，当我点击用户名单元格时没有任何反应。没有错误，没有文本字段，什么也没有。任何帮助将不胜感激！感谢

Answer 1

我没有尝试过你的例子，但我想你只是忘了为特定列设置cellFactory。添加以下行应该修复它：

usernameCol.setCellFactory(cellFactory);

Answer 2

我认为某人需要一个有效的示例，我能够通过添加

来使代码与this tutorial一起使用

usernameCol.setCellFactory(
                TextFieldTableCell.forTableColumn());

并将usernameCol.setOnEditCommit更改为

usernameCol.setOnEditCommit(
                (TableColumn.CellEditEvent<Account, String> t) ->
                    ( t.getTableView().getItems().get(
                            t.getTablePosition().getRow())
                    ).setFieldUsername(t.getNewValue())
                );

以下是应该正常运行的完整 testController 类（其他文件保持不变）

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;

import java.net.URL;
import java.util.ResourceBundle;

public class testController implements Initializable {

    @FXML
    private TableColumn<Account, String> usernameCol;

    @FXML
    private TableColumn<Account, String> balanceCol;

    @FXML
    private TableView<Account> accountTable;

    @FXML
    private TableColumn<Account, String> bookieCol;

    @FXML
    private TableColumn<Account, String> passwordCol;

    private ObservableList<Account> dataList =
            FXCollections.observableArrayList(
                    new Account("bookie", "username", "password", "0"));


    @Override
    public void initialize(URL location, ResourceBundle resources) {
        bookieCol.setCellValueFactory(
                new PropertyValueFactory<>("fieldBookie"));

        usernameCol.setCellValueFactory(
                new PropertyValueFactory<>("fieldUsername"));

        usernameCol.setCellFactory(
                TextFieldTableCell.forTableColumn());

        usernameCol.setOnEditCommit(
                (TableColumn.CellEditEvent<Account, String> t) ->
                    ( t.getTableView().getItems().get(
                            t.getTablePosition().getRow())
                    ).setFieldUsername(t.getNewValue())
                );

        passwordCol.setCellValueFactory(
                new PropertyValueFactory<Account, String>("fieldPassword"));

        balanceCol.setCellValueFactory(
                new PropertyValueFactory<Account, String>("fieldBalance"));

        accountTable.setItems(dataList);

    }
}

Answer 3

您可以使用以下内容将textField添加到编辑单元格：TextFieldTableCell.forTableColumn(); 如果您需要comboBox，请尝试：ComboBoxTableCell.forTableColumn(list);

// TextField
usernameCol.setCellFactory(TextFieldTableCell.forTableColumn());
//ComboBox
ObservableList<String> list = 
        FXCollections.observableArrayList();
            list.add("name 1");
            list.add("name 2");
            list.add("name 3");
            list.add("name 4");
Callback<TableColumn<Account, String>, TableCell<Account, String>> cbtc = 
ComboBoxTableCell.forTableColumn(list);

usernameCol.setCellFactory（CBTC）;

JavaFX表格单元格编辑

3 个答案: