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Java TableVew-抛出KeyEvent时编辑单元格_Java_Javafx_Focus_Tableview - Fatal编程技术网

Java TableVew-抛出KeyEvent时编辑单元格

Java TableVew-抛出KeyEvent时编辑单元格,java,javafx,focus,tableview,Java,Javafx,Focus,Tableview,我在TableView上有一个事件侦听器,用于侦听键盘事件 // Add event listener to table table.setOnKeyTyped(event -> { TablePosition<SimpleStringProperty, String> focusedCell = table.getFocusModel().getFocusedCell(); if (focusedCell != null)

我在TableView上有一个事件侦听器,用于侦听键盘事件

 // Add event listener to table
 table.setOnKeyTyped(event -> {
        TablePosition<SimpleStringProperty, String> focusedCell = table.getFocusModel().getFocusedCell();
        if (focusedCell != null)
        {
            table.getItems().get(focusedCell.getRow()).set(event.getCharacter());
            table.edit(focusedCell.getRow(), focusedCell.getTableColumn());
        }
    });
//将事件侦听器添加到表中
表.setOnKeyTyped(事件->{
TablePosition focusedCell=table.getFocusModel().getFocusedCell();
if(focusedCell!=null)
{
table.getItems().get(focusedCell.getRow()).set(event.getCharacter());
编辑(focusedCell.getRow(),focusedCell.getTableColumn());
}
});
当用户单击enter或将焦点更改为另一个单元格时,我在使用新数据更新单元格时遇到问题。单击“输入”或“更改焦点”时,单元格将变为空。我不知道为什么。如何保存数据并使用新数据更新单元格

// Here is the full code.
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TablePosition;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class TableViewEdit extends Application
{

@Override
public void start(Stage primaryStage)
{
    TableView<SimpleStringProperty> table = new TableView<SimpleStringProperty>();
    table.getSelectionModel().setCellSelectionEnabled(true);
    table.setEditable(true);

    table.getColumns().add(this.createColumn());

    ObservableList<SimpleStringProperty> rowData = FXCollections.observableArrayList();
    //table.getItems().addAll(rowData);
    for (int j = 0; j < 10; j++)
    {
        rowData.add(new SimpleStringProperty(String.format("Cell [%d", j)));
    }

    table.setItems(rowData);

    table.setOnKeyTyped(event -> {
        TablePosition<SimpleStringProperty, String> focusedCell = table.getFocusModel().getFocusedCell();
        if (focusedCell != null)
        {
            table.getItems().get(focusedCell.getRow()).set(event.getCharacter());
            table.edit(focusedCell.getRow(), focusedCell.getTableColumn());
        }
    });

    Scene scene = new Scene(new BorderPane(table), 880, 600);
    primaryStage.setScene(scene);
    primaryStage.show();
}

private TableColumn<SimpleStringProperty, String> createColumn()
{
    TableColumn<SimpleStringProperty, String> col = new TableColumn<>("Column ");
    col.setCellValueFactory(cellData -> cellData.getValue());
    col.setCellFactory(column -> new EditCell());
    return col;
}

private static class EditCell extends TableCell<SimpleStringProperty, String>
{

    private final TextField textField = new TextField();

    EditCell()
    {
        this.textProperty().bind(this.itemProperty());
        this.setGraphic(this.textField);
        this.setContentDisplay(ContentDisplay.TEXT_ONLY);

        this.textField.setOnAction(evt -> this.commitEdit(this.textField.getText()));
        this.textField.focusedProperty().addListener((obs, wasFocused, isNowFocused) -> {
            if (!isNowFocused)
            {
                this.commitEdit(this.textField.getText());
            }
        });
    }

    @Override
    public void startEdit()
    {
        super.startEdit();
        this.textField.setText(this.getItem());
        this.setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
        this.textField.requestFocus();
    }

    @Override
    public void cancelEdit()
    {
        super.cancelEdit();
        this.setContentDisplay(ContentDisplay.TEXT_ONLY);
    }

    @Override
    public void commitEdit(String text)
    {
        super.commitEdit(text);
        this.setContentDisplay(ContentDisplay.TEXT_ONLY);
    }

}

public static void main(String[] args)
{
    launch(args);
}
}
//下面是完整的代码。
导入javafx.application.application;
导入javafx.beans.property.SimpleStringProperty;
导入javafx.collections.FXCollections;
导入javafx.collections.ObservableList;
导入javafx.scene.scene;
导入javafx.scene.control.ContentDisplay;
导入javafx.scene.control.TableCell;
导入javafx.scene.control.TableColumn;
导入javafx.scene.control.TablePosition;
导入javafx.scene.control.TableView;
导入javafx.scene.control.TextField;
导入javafx.scene.layout.BorderPane;
导入javafx.stage.stage;
公共类TableViewEdit扩展了应用程序
{
@凌驾
公共无效开始(阶段primaryStage)
{
TableView table=新TableView();
table.getSelectionModel().setCellSelectionEnabled(true);
table.setEditable(true);
table.getColumns().add(this.createColumn());
ObservableList rowData=FXCollections.observableArrayList();
//table.getItems().addAll(rowData);
对于(int j=0;j<10;j++)
{
添加(新的SimpleStringProperty(String.format(“单元格[%d],j));
}
表.集合项目(行数据);
表.setOnKeyTyped(事件->{
TablePosition focusedCell=table.getFocusModel().getFocusedCell();
if(focusedCell!=null)
{
table.getItems().get(focusedCell.getRow()).set(event.getCharacter());
编辑(focusedCell.getRow(),focusedCell.getTableColumn());
}
});
场景=新场景(新边框窗格(表),880600);
初级阶段。场景(场景);
primaryStage.show();
}
私有TableColumn createColumn()
{
TableColumn col=新的TableColumn(“列”);
col.setCellValueFactory(cellData->cellData.getValue());
col.setCellFactory(列->新建EditCell());
返回列;
}
私有静态类EditCell扩展了TableCell
{
私有最终文本字段TextField=新文本字段();
EditCell()
{
this.textProperty().bind(this.itemProperty());
this.setGraphic(this.textField);
this.setContentDisplay(仅限ContentDisplay.TEXT_);
this.textField.setOnAction(evt->this.committedit(this.textField.getText());
this.textField.focusedProperty().addListener((obs,waspoccused,isNowFocused)->{
如果(!isNowFocused)
{
this.committedit(this.textField.getText());
}
});
}
@凌驾
公开作废已启动IT()
{
super.startEdit();
this.textField.setText(this.getItem());
此.setContentDisplay(仅限ContentDisplay.GRAPHIC_);
this.textField.requestFocus();
}
@凌驾
公共作废取消编辑()
{
super.cancelEdit();
this.setContentDisplay(仅限ContentDisplay.TEXT_);
}
@凌驾
public void committedit(字符串文本)
{
超级。承诺(文本);
this.setContentDisplay(仅限ContentDisplay.TEXT_);
}
}
公共静态void main(字符串[]args)
{
发射(args);
}
}

这些问题变得非常棘手;我认为任何“行为相关”(即对用户输入做出反应的标准控件)都很难更改,而且JavaFX通常不支持这些问题。希望这是API的一个有待改进的领域

似乎存在两个不同的问题。我认为Enter键的情况是,尽管这会在文本字段上生成一个提交编辑等的
ActionEvent
,但
keyTyped
事件仍会传播回表中,导致它重新进入编辑模式。对此的修复方法似乎是使用而不是按下表上的处理程序(尽管老实说,这感觉不是很可靠)

代码依赖于表列上的默认
onEditCommit
处理程序来实际更改属性值。
onEditCommit
处理程序由默认表单元格的
committedit
方法调用。调用
committedit(…)的问题
失去焦点时,默认的
CommittedIt
方法首先检查单元格是否处于编辑状态,如果不处于编辑状态,则什么也不做。看起来,当单元格失去焦点时,在调用
focusProperty
侦听器之前,它会退出编辑状态,因此永远不会调用
onEditCommit
处理程序(顺便说一句,这也会妨碍示例13-11“单元格编辑的替代解决方案”(sic)在JDK 8 u25(当前版本)中正常工作。)

对于第二个问题,我能看到的唯一修复方法是直接从
committedit(…)
方法更新属性。这要求单元格引用属性,这打破了单元格和单元格值之间的良好分隔

我使用常见的
Person
示例重写了该示例,并合并了这两个修复程序。该示例运行得非常好,尽管正如我所说的,有些部分感觉不太稳定:

import java.util.function.Function;

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.scene.Scene;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TablePosition;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;


public class TableViewEditOnType extends Application {


    @Override
    public void start(Stage primaryStage) {

        TableView<Person> table = new TableView<>();

        table.getSelectionModel().setCellSelectionEnabled(true);
        table.setEditable(true);

        table.getColumns().add(createColumn("First Name", Person::firstNameProperty));
        table.getColumns().add(createColumn("Last Name", Person::lastNameProperty));
        table.getColumns().add(createColumn("Email", Person::emailProperty));

        table.getItems().addAll(
                new Person("Jacob", "Smith", "jacob.smith@example.com"),
                new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
                new Person("Ethan", "Williams", "ethan.williams@example.com"),
                new Person("Emma", "Jones", "emma.jones@example.com"),
                new Person("Michael", "Brown", "michael.brown@example.com")
        );

        table.setOnKeyPressed(event -> {
            TablePosition<Person, ?> pos = table.getFocusModel().getFocusedCell() ;
            if (pos != null) {
                table.edit(pos.getRow(), pos.getTableColumn());
            }
        });

        Scene scene = new Scene(new BorderPane(table), 880, 600);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private TableColumn<Person, String> createColumn(String title, Function<Person, StringProperty> property) {
        TableColumn<Person, String> col = new TableColumn<>(title);
        col.setCellValueFactory(cellData -> property.apply(cellData.getValue()));

        col.setCellFactory(column -> new EditCell(property));

        return col ;
    }

    private static class EditCell extends TableCell<Person, String> {

        private final TextField textField = new TextField();

        private final Function<Person, StringProperty> property ;

        EditCell(Function<Person, StringProperty> property) {
            this.property = property ;

            textProperty().bind(itemProperty());
            setGraphic(textField);
            setContentDisplay(ContentDisplay.TEXT_ONLY);

            textField.setOnAction(evt -> {
                commitEdit(textField.getText());
            });
            textField.focusedProperty().addListener((obs, wasFocused, isNowFocused) -> {
                if (! isNowFocused) {
                    commitEdit(textField.getText());
                }
            });
        }

        @Override
        public void startEdit() {
            super.startEdit();
            textField.setText(getItem());
            setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
            textField.requestFocus();          
        }

        @Override
        public void cancelEdit() {
            super.cancelEdit();
            setContentDisplay(ContentDisplay.TEXT_ONLY);
        }

        @Override
        public void commitEdit(String text) {
            super.commitEdit(text);
            Person person = getTableView().getItems().get(getIndex()) ;
            StringProperty cellProperty = property.apply(person);
            cellProperty.set(text);
            setContentDisplay(ContentDisplay.TEXT_ONLY);
        }

    }

    public static class Person {
        private final StringProperty firstName = new SimpleStringProperty();
        private final StringProperty lastName = new SimpleStringProperty();
        private final StringProperty email = new SimpleStringProperty();

        public Person(String firstName, String lastName, String email) {
            setFirstName(firstName);
            setLastName(lastName);
            setEmail(email);
        }

        public final StringProperty firstNameProperty() {
            return this.firstName;
        }

        public final java.lang.String getFirstName() {
            return this.firstNameProperty().get();
        }

        public final void setFirstName(final java.lang.String firstName) {
            this.firstNameProperty().set(firstName);
        }

        public final StringProperty lastNameProperty() {
            return this.lastName;
        }

        public final java.lang.String getLastName() {
            return this.lastNameProperty().get();
        }

        public final void setLastName(final java.lang.String lastName) {
            this.lastNameProperty().set(lastName);
        }

        public final StringProperty emailProperty() {
            return this.email;
        }

        public final java.lang.String getEmail() {
            return this.emailProperty().get();
        }

        public final void setEmail(final java.lang.String email) {
            this.emailProperty().set(email);
        }


    }

    public static void main(String[] args) {
        launch(args);
    }
}
import java.util.function.function;
导入javafx.application.application;
导入javafx.beans.property.SimpleStringProperty;
导入javafx.beans.property.StringProperty;
导入javafx.scene.scene;
导入javafx.scene.control.ContentDisplay;
导入javafx.scene.control.TableCell;
导入javafx.scene.control.TableColumn;
接口信息处理器