鼠标中键上的TableView行选择单击

Question

当前在TableView中，当我们单击鼠标中键时未进行行选择。如果我们单击鼠标右键或鼠标左键，则会选中该行。我正在尝试具有在单击中间按钮时选择行的功能。

我已经知道在表行工厂中包含事件处理程序可以解决此问题。但是我有一个具有许多自定义功能的自定义表格视图，可用于我的应用程序。这个自定义的TableView在我的应用程序中被广泛使用。我的主要问题是，我不能要求每个表行工厂都包含此修复程序。

我正在寻找一种在更高级别（可能在TableView级别）上执行此操作的方法，这样行工厂就不必在意这些。

任何想法/帮助都受到高度赞赏。

下面是我要实现的目标的快速示例。

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TableRowSelectionOnMiddleButtonDemo extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        ObservableList<Person> persons = FXCollections.observableArrayList();
        for (int i = 0; i < 4; i++) {
            persons.add(new Person("First name" + i, "Last Name" + i));
        }

        CustomTableView<Person> tableView = new CustomTableView<>();
        TableColumn<Person, String> fnCol = new TableColumn<>("First Name");
        fnCol.setCellValueFactory(param -> param.getValue().firstNameProperty());

        TableColumn<Person, String> lnCol = new TableColumn<>("Last Name");
        lnCol.setCellValueFactory(param -> param.getValue().lastNameProperty());

        tableView.getColumns().addAll(fnCol, lnCol);
        tableView.getItems().addAll(persons);

        tableView.setRowFactory(new Callback<TableView<Person>, TableRow<Person>>() {
            @Override
            public TableRow<Person> call(TableView<Person> param) {
                return new TableRow<Person>(){
                    {
                        /* This will fix my issue, but I dont want each tableView rowfactory to set this behavior.*/
//                        addEventHandler(MouseEvent.MOUSE_PRESSED,e->{
//                            getTableView().getSelectionModel().select(getItem());
//                        });
                    }
                    @Override
                    protected void updateItem(Person item, boolean empty) {
                        super.updateItem(item, empty);
                    }
                };
            }
        });

        VBox sp = new VBox();
        sp.setAlignment(Pos.TOP_LEFT);
        sp.getChildren().addAll(tableView);
        Scene sc = new Scene(sp);
        primaryStage.setScene(sc);
        primaryStage.show();
    }

    public static void main(String... a) {
        Application.launch(a);
    }

    /**
     * My custom tableView.
     * @param <S>
     */
    class CustomTableView<S> extends TableView<S> {
        public CustomTableView() {
            // A lot of custom behavior is included to this TableView.
        }
    }

    class Person {
        private StringProperty firstName = new SimpleStringProperty();
        private StringProperty lastName = new SimpleStringProperty();

        public Person(String fn, String ln) {
            setFirstName(fn);
            setLastName(ln);
        }

        public String getFirstName() {
            return firstName.get();
        }

        public StringProperty firstNameProperty() {
            return firstName;
        }

        public void setFirstName(String firstName) {
            this.firstName.set(firstName);
        }

        public String getLastName() {
            return lastName.get();
        }

        public StringProperty lastNameProperty() {
            return lastName;
        }

        public void setLastName(String lastName) {
            this.lastName.set(lastName);
        }

    }
}

Answer 1

任何全局自定义（每个控件）功能/行为的切入点是控件的外观。更具体地说：用户交互受皮肤行为的控制-不幸的是，该行为并未使其进入公共范围，因此其访问/修改需要变得肮脏（例如在访问内部类/方法时，部分是通过反射）。

假设允许这种访问，则调整鼠标交互以使其与TableCell的主按钮的反应方式相同的步骤

• 实现自定义TableCellSkin
• 反思地访问其行为
• 在行为的inputMap中找到mousePressed处理程序
• 用自定义处理程序替换原始处理程序，该处理程序将来自中间按钮的mouseEvent替换为来自主按钮的mouseEvent
• 将自定义TableCellSkin设置为css的默认值

注意：负责处理表右侧可用空间中的mouseEvent的TableRowSkin并未分隔中间按钮，因此当前无事可做。如果将来发生这种情况，只需应用与表格单元格相同的技巧即可。

示例：

public class TableRowCustomMouse extends Application {

    public static class CustomMouseTableCellSkin<T, S> extends TableCellSkin<T, S> {

        EventHandler<MouseEvent> original;

        public CustomMouseTableCellSkin(TableCell<T, S> control) {
            super(control);
            adjustMouseBehavior();
        }

        private void adjustMouseBehavior() {
            // dirty: reflective access to behavior, use your custom reflective accessor
            TableCellBehavior<T, S> behavior = 
                (TableCellBehavior<T, S>) FXUtils.invokeGetFieldValue(TableCellSkin.class, this, "behavior");
            InputMap<TableCell<T, S>> inputMap = behavior.getInputMap();
            ObservableList<Mapping<?>> mappings = inputMap.getMappings();
            List<Mapping<?>> pressedMapping = mappings.stream()
                    .filter(mapping -> mapping.getEventType() == MouseEvent.MOUSE_PRESSED)
                    .collect(Collectors.toList());
            if (pressedMapping.size() == 1) {
                Mapping<?> originalMapping = pressedMapping.get(0);
                original = (EventHandler<MouseEvent>) pressedMapping.get(0).getEventHandler();
                if (original != null) {
                    EventHandler<MouseEvent> replaced = this::replaceMouseEvent;
                    mappings.remove(originalMapping);
                    mappings.add(new MouseMapping(MouseEvent.MOUSE_PRESSED, replaced));
                }
            }
        }

        private void replaceMouseEvent(MouseEvent e) {
            MouseEvent replaced = e;
            if (e.isMiddleButtonDown()) {
                replaced = new MouseEvent(e.getSource(), e.getTarget(), e.getEventType(),
                    e.getX(), e.getY(),
                    e.getScreenX(), e.getScreenY(),
                    MouseButton.PRIMARY,
                    e.getClickCount(),
                    e.isShiftDown(), e.isControlDown(), e.isAltDown(), e.isMetaDown(),
                    true, false, false,
                    e.isSynthesized(), e.isPopupTrigger(), e.isStillSincePress(),
                    null
                    );
            }
            original.handle(replaced);
        }

    }
    private Parent createContent() {
        TableView<Person> table = new TableView<>(Person.persons());
        TableColumn<Person, String> first = new TableColumn("First Name");
        first.setCellValueFactory(cc -> cc.getValue().firstNameProperty());
        TableColumn<Person, String> last = new TableColumn<>("Last Name");
        last.setCellValueFactory(cc -> cc.getValue().lastNameProperty());
        table.getColumns().addAll(first, last);
        BorderPane content = new BorderPane(table);
        return content;
    }

    @Override
    public void start(Stage stage) throws Exception {
        stage.setScene(new Scene(createContent()));
        // load the default css 
        stage.getScene().getStylesheets()
            .add(getClass().getResource("customtablecellskin.css").toExternalForm());
        stage.setTitle(FXUtils.version());
        stage.show();
    }

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

    @SuppressWarnings("unused")
    private static final Logger LOG = Logger
            .getLogger(TableRowCustomMouse.class.getName());

}

具有用于TableCell的自定义外观的CSS：

.table-cell {
    -fx-skin: "<yourpackage>.TableRowCustomMouse$CustomMouseTableCellSkin";
}

Answer 2

接受@kleopatra的回答。但是，我的问题的解决方案与@kleopatra的答案有些不同。但是核心思想还是一样。

我用这种方法来重写TableCellBehavior的doSelect方法

    @Override
    protected void doSelect(double x, double y, MouseButton button, int clickCount, boolean shiftDown, boolean shortcutDown) {
        MouseButton btn = button;
        if (button == MouseButton.MIDDLE) {
            btn = MouseButton.PRIMARY;
        }
        super.doSelect(x, y, btn, clickCount, shiftDown, shortcutDown);
    }

下面是解决我的问题的工作演示：

DemoClass：

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class TableRowSelectionOnMiddleButtonDemo extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        ObservableList<Person> persons = FXCollections.observableArrayList();
        for (int i = 0; i < 4; i++) {
            persons.add(new Person("First name" + i, "Last Name" + i));
        }

        CustomTableView<Person> tableView = new CustomTableView<>();
        TableColumn<Person, String> fnCol = new TableColumn<>("First Name");
        fnCol.setCellValueFactory(param -> param.getValue().firstNameProperty());

        TableColumn<Person, String> lnCol = new TableColumn<>("Last Name");
        lnCol.setCellValueFactory(param -> param.getValue().lastNameProperty());

        tableView.getColumns().addAll(fnCol, lnCol);
        tableView.getItems().addAll(persons);

        tableView.setRowFactory(new Callback<TableView<Person>, TableRow<Person>>() {
            @Override
            public TableRow<Person> call(TableView<Person> param) {
                return new TableRow<Person>() {
                    {
                        /* This will fix my issue, but I dont want each tableView rowfactory to set this behavior.*/
//                        addEventHandler(MouseEvent.MOUSE_PRESSED,e->{
//                            getTableView().getSelectionModel().select(getItem());
//                        });
                    }

                    @Override
                    protected void updateItem(Person item, boolean empty) {
                        super.updateItem(item, empty);
                    }
                };
            }
        });

        VBox sp = new VBox();
        sp.setAlignment(Pos.TOP_LEFT);
        sp.getChildren().addAll(tableView);
        Scene sc = new Scene(sp);
        sc.getStylesheets().add(this.getClass().getResource("tableRowSelectionOnMiddleButton.css").toExternalForm());
        primaryStage.setScene(sc);
        primaryStage.show();
    }

    public static void main(String... a) {
        Application.launch(a);
    }

    /**
     * My custom tableView.
     *
     * @param <S>
     */
    class CustomTableView<S> extends TableView<S> {
        public CustomTableView() {
            // A lot of custom behavior is included to this TableView.
        }
    }


    class Person {
        private StringProperty firstName = new SimpleStringProperty();
        private StringProperty lastName = new SimpleStringProperty();

        public Person(String fn, String ln) {
            setFirstName(fn);
            setLastName(ln);
        }

        public String getFirstName() {
            return firstName.get();
        }

        public StringProperty firstNameProperty() {
            return firstName;
        }

        public void setFirstName(String firstName) {
            this.firstName.set(firstName);
        }

        public String getLastName() {
            return lastName.get();
        }

        public StringProperty lastNameProperty() {
            return lastName;
        }

        public void setLastName(String lastName) {
            this.lastName.set(lastName);
        }

    }
}

CustomTableCellSkin类：

import com.sun.javafx.scene.control.behavior.TableCellBehavior;
import com.sun.javafx.scene.control.skin.TableCellSkinBase;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ReadOnlyDoubleProperty;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.input.MouseButton;

public class CustomTableCellSkin<S, T> extends TableCellSkinBase<TableCell<S, T>, TableCellBehavior<S, T>> {

    private final TableColumn<S, T> tableColumn;

    public CustomTableCellSkin(TableCell<S, T> tableCell) {
        super(tableCell, new CustomTableCellBehavior<S, T>(tableCell));
        this.tableColumn = tableCell.getTableColumn();
        super.init(tableCell);
    }

    @Override
    protected BooleanProperty columnVisibleProperty() {
        return tableColumn.visibleProperty();
    }

    @Override
    protected ReadOnlyDoubleProperty columnWidthProperty() {
        return tableColumn.widthProperty();
    }
}

class CustomTableCellBehavior<S, T> extends TableCellBehavior<S, T> {
    public CustomTableCellBehavior(TableCell<S, T> control) {
        super(control);
    }

    @Override
    protected void doSelect(double x, double y, MouseButton button, int clickCount, boolean shiftDown, boolean shortcutDown) {
        MouseButton btn = button;
        if (button == MouseButton.MIDDLE) {
            btn = MouseButton.PRIMARY;
        }
        super.doSelect(x, y, btn, clickCount, shiftDown, shortcutDown);
    }
}

tableRowSelectionOnMiddleButton.css

.table-cell {
    -fx-skin: "<package>.CustomTableCellSkin";
}