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Java 如何在TableView中使用箭头按钮在编辑模式下遍历单元格_Java_Javafx - Fatal编程技术网

Java 如何在TableView中使用箭头按钮在编辑模式下遍历单元格

Java 如何在TableView中使用箭头按钮在编辑模式下遍历单元格,java,javafx,Java,Javafx,我想使用arrow/enter键遍历TableView中的单元格,但是,如果我试图在我的自定义EditCell类中实现它,它似乎不起作用。有没有办法做到这一点?我在TextField上尝试了一个侦听器,但它实际上并没有启动实际单元格中的焦点 这是我的密码: Tester.java package tester; import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.contro

我想使用arrow/enter键遍历
TableView
中的单元格,但是,如果我试图在我的自定义EditCell类中实现它,它似乎不起作用。有没有办法做到这一点?我在
TextField
上尝试了一个侦听器,但它实际上并没有启动实际单元格中的焦点

这是我的密码:

Tester.java

package tester;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class Tester extends Application
{

    @Override
    public void start(Stage primaryStage)
    {

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

        Callback<TableColumn<LineItem, String>, TableCell<LineItem, String>> textFactoryEditable = (TableColumn<LineItem, String> p) -> new EditableTextCell();

        TableColumn<LineItem, String> column1 = new TableColumn<>("Test1");
        column1.setCellValueFactory(cellData -> cellData.getValue().getString1Property());
        column1.setEditable(true);
        column1.setCellFactory(textFactoryEditable);

        table.getColumns().add(column1);

        TableColumn<LineItem, String> column2 = new TableColumn<>("Test2");
        column2.setCellValueFactory(cellData -> cellData.getValue().getString2Property());
        column2.setEditable(true);
        column2.setCellFactory(textFactoryEditable);

        table.getColumns().add(column2);

        table.getItems().add(new LineItem());
        table.getItems().add(new LineItem());
        table.getItems().add(new LineItem());

        table.setPrefWidth(500);

        HBox root = new HBox();
        root.getChildren().addAll(table);

        Scene scene = new Scene(root, 500, 500);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        launch(args);
    }

}
package tester;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class LineItem
{

    private final StringProperty string1;
    private final StringProperty string2;

    public LineItem()
    {
        this.string1 = new SimpleStringProperty();
        this.string2 = new SimpleStringProperty();
    }

    public final StringProperty getString1Property()
    {
        return this.string1;
    }

    public final StringProperty getString2Property()
    {
        return this.string2;
    }
}
package tester;

import java.util.Objects;
import javafx.beans.value.ObservableValue;
import javafx.beans.value.WritableValue;
import javafx.geometry.Pos;
import javafx.scene.control.TableCell;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;

public class EditableTextCell<E> extends TableCell<E, String>
{

    private final TextField textField;
    private boolean updating = false;

    public EditableTextCell()
    {
        textField = new TextField();
        textField.setAlignment(Pos.CENTER_RIGHT);


        textField.textProperty().addListener((ObservableValue<? extends String> o, String oldValue, String newValue) ->
        {

            if (!updating)
            {
                ((WritableValue<String>) getTableColumn().getCellObservableValue((E) getTableRow().getItem())).setValue(newValue);
                getTableView().scrollTo(getTableRow().getIndex());
                getTableView().scrollToColumn(getTableColumn());
            }

        });

        textField.setOnKeyPressed((KeyEvent ke) ->
        {
            switch (ke.getCode())
            {
                case DOWN:
                    getTableView().getFocusModel().focusBelowCell();
                    break;
                case UP:
                    getTableView().getFocusModel().focusAboveCell();
                    break;
                case RIGHT:
                    getTableView().getFocusModel().focusRightCell();
                    break;
                case LEFT:
                    getTableView().getFocusModel().focusLeftCell();
                    break;
                default:
                    break;
            }
        });

    }

    @Override
    protected void updateItem(String item, boolean empty)
    {
        super.updateItem(item, empty);
        if (empty)
        {
            setGraphic(null);
        } else
        {
            setGraphic(textField);
            if (!Objects.equals(textField.getText(), item))
            {
                // prevent own updates from moving the cursor
                updating = true;
                textField.setText(item);
                updating = false;

            }
        }
    }
}
EditableTextCell.java

package tester;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class Tester extends Application
{

    @Override
    public void start(Stage primaryStage)
    {

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

        Callback<TableColumn<LineItem, String>, TableCell<LineItem, String>> textFactoryEditable = (TableColumn<LineItem, String> p) -> new EditableTextCell();

        TableColumn<LineItem, String> column1 = new TableColumn<>("Test1");
        column1.setCellValueFactory(cellData -> cellData.getValue().getString1Property());
        column1.setEditable(true);
        column1.setCellFactory(textFactoryEditable);

        table.getColumns().add(column1);

        TableColumn<LineItem, String> column2 = new TableColumn<>("Test2");
        column2.setCellValueFactory(cellData -> cellData.getValue().getString2Property());
        column2.setEditable(true);
        column2.setCellFactory(textFactoryEditable);

        table.getColumns().add(column2);

        table.getItems().add(new LineItem());
        table.getItems().add(new LineItem());
        table.getItems().add(new LineItem());

        table.setPrefWidth(500);

        HBox root = new HBox();
        root.getChildren().addAll(table);

        Scene scene = new Scene(root, 500, 500);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        launch(args);
    }

}
package tester;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class LineItem
{

    private final StringProperty string1;
    private final StringProperty string2;

    public LineItem()
    {
        this.string1 = new SimpleStringProperty();
        this.string2 = new SimpleStringProperty();
    }

    public final StringProperty getString1Property()
    {
        return this.string1;
    }

    public final StringProperty getString2Property()
    {
        return this.string2;
    }
}
package tester;

import java.util.Objects;
import javafx.beans.value.ObservableValue;
import javafx.beans.value.WritableValue;
import javafx.geometry.Pos;
import javafx.scene.control.TableCell;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;

public class EditableTextCell<E> extends TableCell<E, String>
{

    private final TextField textField;
    private boolean updating = false;

    public EditableTextCell()
    {
        textField = new TextField();
        textField.setAlignment(Pos.CENTER_RIGHT);


        textField.textProperty().addListener((ObservableValue<? extends String> o, String oldValue, String newValue) ->
        {

            if (!updating)
            {
                ((WritableValue<String>) getTableColumn().getCellObservableValue((E) getTableRow().getItem())).setValue(newValue);
                getTableView().scrollTo(getTableRow().getIndex());
                getTableView().scrollToColumn(getTableColumn());
            }

        });

        textField.setOnKeyPressed((KeyEvent ke) ->
        {
            switch (ke.getCode())
            {
                case DOWN:
                    getTableView().getFocusModel().focusBelowCell();
                    break;
                case UP:
                    getTableView().getFocusModel().focusAboveCell();
                    break;
                case RIGHT:
                    getTableView().getFocusModel().focusRightCell();
                    break;
                case LEFT:
                    getTableView().getFocusModel().focusLeftCell();
                    break;
                default:
                    break;
            }
        });

    }

    @Override
    protected void updateItem(String item, boolean empty)
    {
        super.updateItem(item, empty);
        if (empty)
        {
            setGraphic(null);
        } else
        {
            setGraphic(textField);
            if (!Objects.equals(textField.getText(), item))
            {
                // prevent own updates from moving the cursor
                updating = true;
                textField.setText(item);
                updating = false;

            }
        }
    }
}
包装测试仪;
导入java.util.Objects;
导入javafx.beans.value.observeValue;
导入javafx.beans.value.WritableValue;
导入javafx.geometry.Pos;
导入javafx.scene.control.TableCell;
导入javafx.scene.control.TextField;
导入javafx.scene.input.KeyEvent;
公共类EditableTextCell扩展了TableCell
{
私有最终文本字段文本字段;
私有布尔更新=false;
公共EditableTextCell()
{
textField=新的textField();
textField.setAlignment(右中位置);

textField.textProperty().addListener((observeValue多亏了Slaw,才算出了它

首先要启用单元格选择,
table.getSelectionModel().setCellSelectionEnabled(true);

然后在EditableTextCell.java类中:

        this.focusedProperty().addListener((ObservableValue<? extends Boolean> o, Boolean oldValue, Boolean newValue) ->
        {
            if (newValue)
            {
                textField.requestFocus();
            }

        });

        textField.focusedProperty().addListener((ObservableValue<? extends Boolean> o, Boolean oldValue, Boolean newValue) ->
        {
            if (newValue)
            {
                getTableView().getFocusModel().focus(getTableRow().getIndex(), getTableColumn());
            }
        }


        textField.setOnKeyPressed((KeyEvent ke) ->
        {
            switch (ke.getCode())
            {
                case DOWN:
                    getTableView().getFocusModel().focusBelowCell();
                    ke.consume();
                    break;
                case ENTER:
                    getTableView().getFocusModel().focusBelowCell();
                    ke.consume();
                    break;
                case UP:
                    getTableView().getFocusModel().focusAboveCell();
                    ke.consume();
                    break;
                case RIGHT:
                    getTableView().getFocusModel().focusRightCell();
                    ke.consume();
                    break;
                case LEFT:
                    getTableView().getFocusModel().focusLeftCell();
                    ke.consume();
                    break;
                default:
                    break;
            }
        });
this.focusedProperty().addListener((observeValueRow选择模式
尽管如此,您似乎不需要为此启用。从的实现中得到启发,您的自定义
TableCell
应该采取某种形式的回调来获取模型属性;它也可能需要,允许您使用
TableCell
而不仅仅是
String
s。以下是一个示例:

import java.util.Objects;
import java.util.function.IntFunction;
import javafx.beans.binding.Bindings;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.Property;
import javafx.beans.property.SimpleObjectProperty;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView.TableViewFocusModel;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.util.Callback;
import javafx.util.StringConverter;
import javafx.util.converter.DefaultStringConverter;

public class CustomTableCell<S, T> extends TableCell<S, T> {

    public static <S> Callback<TableColumn<S, String>, TableCell<S, String>> forTableColumn(
            IntFunction<Property<String>> extractor) {
        return forTableColumn(extractor, new DefaultStringConverter());
    }

    public static <S, T> Callback<TableColumn<S, T>, TableCell<S, T>> forTableColumn(
            IntFunction<Property<T>> extractor, StringConverter<T> converter) {
        Objects.requireNonNull(extractor);
        Objects.requireNonNull(converter);
        return column -> new CustomTableCell<>(extractor, converter);
    }

    private final ObjectProperty<IntFunction<Property<T>>> extractor = new SimpleObjectProperty<>(this, "extractor");
    public final void setExtractor(IntFunction<Property<T>> callback) { extractor.set(callback); }
    public final IntFunction<Property<T>> getExtractor() { return extractor.get(); }
    public final ObjectProperty<IntFunction<Property<T>>> extractorProperty() { return extractor; }

    private final ObjectProperty<StringConverter<T>> converter = new SimpleObjectProperty<>(this, "converter");
    public final void setConverter(StringConverter<T> converter) { this.converter.set(converter); }
    public final StringConverter<T> getConverter() { return converter.get(); }
    public final ObjectProperty<StringConverter<T>> converterProperty() { return converter; }

    private Property<T> property;
    private TextField textField;

    public CustomTableCell(IntFunction<Property<T>> extractor, StringConverter<T> converter) {
        setExtractor(extractor);
        setConverter(converter);

        // Assumes this TableCell will never become part of a different TableView
        // after the first one. Also assumes the focus model of the TableView will
        // never change. These are not great assumptions (especially the latter),
        // but this is only an example.
        tableViewProperty().addListener((obs, oldTable, newTable) ->
                newTable.getFocusModel().focusedCellProperty().addListener((obs2, oldPos, newPos) -> {
                    if (getIndex() == newPos.getRow() && getTableColumn() == newPos.getTableColumn()) {
                        textField.requestFocus();
                    }
                })
        );
    }

    @Override
    protected void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);
        if (empty) {
            setText(null);
            setGraphic(null);
            cleanUpProperty();
        } else {
            initializeTextField();
            cleanUpProperty();

            property = getExtractor().apply(getIndex());
            Bindings.bindBidirectional(textField.textProperty(), property, getConverter());

            setGraphic(textField);
            if (getTableView().getFocusModel().isFocused(getIndex(), getTableColumn())) {
                textField.requestFocus();
            }
        }
    }

    private void cleanUpProperty() {
        if (property != null) {
            Bindings.unbindBidirectional(textField.textProperty(), property);
            property = null;
        }
    }

    private void initializeTextField() {
        if (textField == null) {
            textField = new TextField();
            textField.addEventFilter(KeyEvent.KEY_PRESSED, this::processArrowKeys);
            textField.focusedProperty().addListener((observable, wasFocused, isFocused) -> {
                if (isFocused) {
                    getTableView().getFocusModel().focus(getIndex(), getTableColumn());
                }
            });
        }
    }

    private void processArrowKeys(KeyEvent event) {
        if (event.getCode().isArrowKey()) {
            event.consume();

            TableViewFocusModel<S> model = getTableView().getFocusModel();
            switch (event.getCode()) {
                case UP:
                    model.focusAboveCell();
                    break;
                case RIGHT:
                    model.focusRightCell();
                    break;
                case DOWN:
                    model.focusBelowCell();
                    break;
                case LEFT:
                    model.focusLeftCell();
                    break;
                default:
                    throw new AssertionError(event.getCode().name());
            }
            getTableView().scrollTo(model.getFocusedCell().getRow());
            getTableView().scrollToColumnIndex(model.getFocusedCell().getColumn());
        }
    }

}

单元选择模式 然而,您试图实现的这种行为似乎本质上是基于单元格的,因此启用单元格选择可能更好。这允许自定义
TableCell
将其行为基于选择,而不是聚焦,并将箭头键处理留给
TableView
上述例子:

import java.util.Objects;
import java.util.function.IntFunction;
import javafx.beans.binding.Bindings;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.Property;
import javafx.beans.property.SimpleObjectProperty;
import javafx.event.EventDispatcher;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.util.Callback;
import javafx.util.StringConverter;
import javafx.util.converter.DefaultStringConverter;

public class CustomTableCell<S, T> extends TableCell<S, T> {

    /* 
     * -- CODE OMITTED --
     *
     * The factory methods (forTableColumn) and properties (extractor
     * and converter) have been omitted for brevity. They are defined
     * and used exactly the same way as in the previous example.
     */

    private Property<T> property;
    private TextField textField;

    public CustomTableCell(IntFunction<Property<T>> extractor, StringConverter<T> converter) {
        setExtractor(extractor);
        setConverter(converter);
    }

    @Override
    public void updateSelected(boolean selected) {
        super.updateSelected(selected);
        if (selected && !isEmpty()) {
            textField.requestFocus();
        }
    }

    @Override
    protected void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);
        if (empty) {
            setText(null);
            setGraphic(null);
            clearProperty();
        } else {
            initializeTextField();
            clearProperty();

            property = getExtractor().apply(getIndex());
            Bindings.bindBidirectional(textField.textProperty(), property, getConverter());

            setGraphic(textField);
            if (isSelected()) {
                textField.requestFocus();
            }
        }
    }

    private void clearProperty() {
        if (property != null) {
            Bindings.unbindBidirectional(textField.textProperty(), property);
            textField.setText(null);
            property = null;
        }
    }

    private void initializeTextField() {
        if (textField == null) {
            textField = new TextField();
            textField.focusedProperty().addListener((observable, wasFocused, isFocused) -> {
                if (isFocused && !isSelected()) {
                    getTableView().getSelectionModel().clearAndSelect(getIndex(), getTableColumn());
                }
            });

            /*
             * TableView has key handlers that will select cells based on arrow keys being
             * pressed, scrolling to them if necessary. I find this mechanism looks cleaner
             * because, unlike TableView#scrollTo, it doesn't cause the cell to jump to the
             * top of the TableView.
             *
             * The way this works is by bypassing the TextField if, and only if, the event
             * is a KEY_PRESSED event and the pressed key is an arrow key. This lets the
             * event bubble up back to the TableView and let it do what it needs to. All
             * other key events are given to the TextField for normal processing.
             *
             * NOTE: The behavior being relied upon here is added by the default TableViewSkin
             *       and its corresponding TableViewBehavior. This may not work if a custom
             *       TableViewSkin skin is used.
             */
            EventDispatcher oldDispatcher = textField.getEventDispatcher();
            textField.setEventDispatcher((event, tail) -> {
                if (event.getEventType() == KeyEvent.KEY_PRESSED
                        && ((KeyEvent) event).getCode().isArrowKey()) {
                    return event;
                } else {
                    return oldDispatcher.dispatchEvent(event, tail);
                }
            });
        }
    }

}
导入java.util.Objects;
导入java.util.function.IntFunction;
导入javafx.beans.binding.Bindings;
导入javafx.beans.property.ObjectProperty;
导入javafx.beans.property.property;
导入javafx.beans.property.SimpleObject属性;
导入javafx.event.EventDispatcher;
导入javafx.scene.control.TableCell;
导入javafx.scene.control.TableColumn;
导入javafx.scene.control.TextField;
导入javafx.scene.input.KeyEvent;
导入javafx.util.Callback;
导入javafx.util.StringConverter;
导入javafx.util.converter.DefaultStringConverter;
公共类CustomTableCell扩展了TableCell{
/* 
*--代码省略--
*
*工厂方法(forTableColumn)和属性(提取器
*为了简洁起见,省略了(和转换器)。定义了
*并使用与上一个示例完全相同的方法。
*/
私有财产;
私有文本字段文本字段;
公共CustomTableCell(IntFunction提取器、StringConverter转换器){
设置提取器(提取器);
设置转换器(转换器);
}
@凌驾
已选择公共无效更新(已选择布尔值){
super.updateSelected(已选择);
如果(已选择&&!isEmpty()){
textField.requestFocus();
}
}
@凌驾
受保护的void updateItem(T项,布尔值为空){
super.updateItem(项,空);
if(空){
setText(空);
设置图形(空);
clearProperty();
}否则{
initializeTextField();
clearProperty();
property=getExtractor().apply(getIndex());
Bindings.bindBidirective(textField.textProperty(),property,getConverter());
设置图形(文本字段);
if(isSelected()){
textField.requestFocus();
}
}
}
私有无效clearProperty(){
if(属性!=null){
Bindings.UnbindBioderial(textField.textProperty(),property);
textField.setText(空);
属性=null;
}
}
私有void initializeTextField(){
if(textField==null){
textField=新的textField();
textField.focusedProperty().addListener((可观察、聚焦、聚焦)->{
如果(isFocused&!isSelected()){
getTableView().getSelectionModel().clearAndSelect(getIndex(),getTableColumn());
}
});
/*
*TableView具有键处理程序,该处理程序将根据正在使用的箭头键选择单元格
*按下,必要时滚动到它们。我发现这个机制看起来更干净
*因为,与TableView#scrollTo不同,它不会导致单元格跳转到
*桌面视图的顶部。
*
*其工作方式是当且仅当事件发生时绕过TextField
*是按键按下事件,按键是箭头键。这使
*事件气泡返回到TableView,让它做它需要做的事情
*其他关键事件将提供给TextField进行正常处理。
*
*注意:此处所依赖的行为是由默认的TableViewSkin添加的
*以及相应的TableViewBehavior。如果自定义
*使用TableViewSkin。
*/
EventDispatcher oldDispatcher=textField.getEventDispatcher();
textField.setEventDispatcher((事件,尾部)->{
如果(event.getEventType()==KeyEvent.KEY_)被按下
&&((KeyEvent)event.getCode().isArrowKey()){
返回事件;
}否则{
返回oldDispatcher.dispatchEvent(事件,尾部);
}
});
}
}
}