javafx-2 - 如何检测按键

Question

我想创建要在其中配置热键快捷键的表。

我有这个简单的表格:

    public static final String Column1MapKey = "A";
    public static final String Column2MapKey = "B";

    private ObservableList<Map> generateDataInMap() {
        int max = 110;
        ObservableList<Map> allData = FXCollections.observableArrayList();
        for (int i = 1; i < max; i++) {
            Map<String, String> dataRow = new HashMap<>();

            String value1 = "A" + i;
            String value2 = "B" + i;

            dataRow.put(Column1MapKey, value1);
            dataRow.put(Column2MapKey, value2);

            allData.add(dataRow);
        }
        return allData;
    }

public TabPane hotKeysContent(){

        TableColumn<Map, String> firstDataColumn = new TableColumn<>("Actions");
        TableColumn<Map, String> secondDataColumn = new TableColumn<>("Shortcut");

        firstDataColumn.setCellValueFactory(new MapValueFactory(Column1MapKey));
        firstDataColumn.setMinWidth(230);
        secondDataColumn.setCellValueFactory(new MapValueFactory(Column2MapKey));
        secondDataColumn.setMinWidth(230);

        TableView table_view = new TableView<>(generateDataInMap());
        table_view.setPadding(new Insets(5, 5, 5, 5));

        table_view.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);  // Autoresize when window size is changed

        table_view.setEditable(true);
        table_view.getSelectionModel().setCellSelectionEnabled(true);
        table_view.getColumns().setAll(firstDataColumn, secondDataColumn);
        Callback<TableColumn<Map, String>, TableCell<Map, String>>
            cellFactoryForMap = new Callback<TableColumn<Map, String>,
                TableCell<Map, String>>() {
                    @Override
                    public TableCell call(TableColumn p) {
                        return new TextFieldTableCell(new StringConverter() {
                            @Override
                            public String toString(Object t) {
                                return t.toString();
                            }
                            @Override
                            public Object fromString(String string) {
                                return string;
                            }                                    
                        });
                    }
        };
        firstDataColumn.setCellFactory(cellFactoryForMap);
        secondDataColumn.setCellFactory(cellFactoryForMap);

        return null;
    }

我希望当我单击第二列中的一行时获得我将按下的键组合，然后使用这些键激活键盘快捷键。任何例子都会有帮助。

P.S 表包含命令:

public static final String Column1MapKey = "A";
    public static final String Column2MapKey = "B";

    private ObservableList<Map> generateDataInMap() {
        int max = 110;
        ObservableList<Map> allData = FXCollections.observableArrayList();
        for (int i = 1; i < max; i++) {
            Map<String, String> dataRow = new HashMap<>();

            String value1 = "A" + i;
            String value2 = "B" + i;

            dataRow.put(Column1MapKey, value1);
            dataRow.put(Column2MapKey, value2);

            allData.add(dataRow);
        }
        return allData;
    }

    public TabPane hotKeysContent(){

        TabPane tabPane = new TabPane();
        //tabPane.setStyle("-fx-font-size: 13pt;"); // Set size of the tab name

        Tab tabA = new Tab();
        Label tabALabel = new Label("Shortcuts");
        //tabALabel.setStyle("-fx-font-size: 12pt;"); // Set size of the tab name
        tabA.setGraphic(tabALabel);
        tabA.setClosable(false); // da se mahne opciqta da se zatvarq tab


        TableColumn<Map, String> firstDataColumn = new TableColumn<>("Actions");
        TableColumn<Map, String> secondDataColumn = new TableColumn<>("Shortcut");

        firstDataColumn.setCellValueFactory(new MapValueFactory(Column1MapKey));
        firstDataColumn.setMinWidth(230);
        secondDataColumn.setCellValueFactory(new MapValueFactory(Column2MapKey));
        secondDataColumn.setMinWidth(230);

        TableView table_view = new TableView<>(generateDataInMap());
        table_view.setPadding(new Insets(5, 5, 5, 5));

        table_view.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);  // Autoresize when window size is changed

        table_view.setEditable(true);
        table_view.getSelectionModel().setCellSelectionEnabled(true);
        table_view.getColumns().setAll(firstDataColumn, secondDataColumn);
        Callback<TableColumn<Map, String>, TableCell<Map, String>>
            cellFactoryForMap = new Callback<TableColumn<Map, String>,
                TableCell<Map, String>>() {
                    @Override
                    public TableCell call(TableColumn p) {
                        return new TextFieldTableCell(new StringConverter() {
                            @Override
                            public String toString(Object t) {
                                return t.toString();
                            }
                            @Override
                            public Object fromString(String string) {
                                return string;
                            }                                    
                        });
                    }
        };
        firstDataColumn.setCellFactory(cellFactoryForMap);
        secondDataColumn.setCellFactory(cellFactoryForMap);

        tabA.setContent(table_view);                
        tabPane.getTabs().add(tabA);       

        return tabPane;
    }

Answer 1

下面是一个SSCCE，虽然没有tableView，也没有列或单元格。但逻辑是相似的。检查它的线索并根据您的需要编写您自己的代码:

public class ShortCutDemo extends Application {

    private KeyEvent shortcutKeyEvent;
    private EventHandler selectedEventHandler;
    private List<EventHandler> eventHandlers;
    private HBox root;

    @Override
    public void start(Stage primaryStage) {

        root = new HBox(10);
        root.addEventFilter(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                // Do not filter for TextFields
                if (event.getTarget() instanceof TextField) {
                    return;
                }
                if (isKeyEventsAreEqual(event, shortcutKeyEvent)) {
                    // then apply shortcut event
                    selectedEventHandler.handle(null);
                    event.consume();
                }
            }
        });

        eventHandlers = new ArrayList<EventHandler>();
        eventHandlers.add(new EventHandler() {
            @Override
            public void handle(Event event) {
                root.setStyle("-fx-background-color: lightgray");
            }
        });

        eventHandlers.add(new EventHandler() {
            @Override
            public void handle(Event event) {
                root.setSpacing(50);
            }
        });

        ChoiceBox cb = new ChoiceBox();
        cb.getItems().addAll("HBox background = gray", "HBox spacing = 50");
        cb.getSelectionModel().selectedIndexProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                selectedEventHandler = eventHandlers.get(newValue.intValue());
            }
        });
        cb.getSelectionModel().selectFirst(); // default value

        final TextField textField = new TextField();
        textField.setEditable(false);

        textField.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                if (event.getCode() == KeyCode.TAB) {
//                    Platform.runLater(new Runnable() {
//                        @Override
//                        public void run() {
//                            root.requestFocus();
//                        }
//                    });
                } else {
                    // Clear the previous text
                    textField.setText("");
                    // Process only desired key types
                    if (event.getCode().isLetterKey()
                            || event.getCode().isDigitKey()
                            || event.getCode().isFunctionKey()) {
                        String shortcut = event.getCode().getName();
                        if (event.isAltDown()) {
                            shortcut = "Alt + " + shortcut;
                        }
                        if (event.isControlDown()) {
                            shortcut = "Ctrl + " + shortcut;
                        }
                        if (event.isShiftDown()) {
                            shortcut = "Shift + " + shortcut;
                        }
                        textField.setText(shortcut);
                        shortcutKeyEvent = event;
                    } else {
                        shortcutKeyEvent = null;
                    }
                }
            }
        });

        Button button = new Button("Reset");
        button.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                textField.setText("");
                root.setSpacing(10);
                root.setStyle("-fx-background-color: white");
                shortcutKeyEvent = null;
            }
        });

        root.getChildren().addAll(new Label("Define a shortcut for "), cb, textField, button);
        Scene scene = new Scene(root, 900, 150);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private boolean isKeyEventsAreEqual(KeyEvent event1, KeyEvent event2) {
        return event1 != null
                && event2 != null
                && event1.getCode() == event2.getCode()
                && event1.isAltDown() == event2.isAltDown()
                && event1.isControlDown() == event2.isControlDown()
                && event1.isShiftDown() == event2.isShiftDown();
    }

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

它是如何工作的？
1) 从选择框中选择一个操作(事件)类型。
2) 将焦点置于文本字段并输入所需的快捷键，例如 Alt+F1。
3) 按 Tab 将焦点移出 TextField。
4) 再次按快捷键(在本例中为Alt+F1)以查看正在运行的事件。
5) 按“Reset”按钮确实可以重置状态。

进一步的改进应该是定义一个模型类，该类具有快捷键、Ctrl、Alt 和 Shift 的 bool 值、要处理的事件处理程序以及适当重写 equals(...) 方法。