Question

我的用户界面有一个添加按钮，我想为其分配键盘快捷键组合。我没有为此目的使用setAcceleartor。在javafx应用程序中设置键盘快捷键的最简单方法是什么？

UI中的

按钮声明：

 <Button fx:id="addButton" alignment="CENTER" minWidth="-Infinity" mnemonicParsing="false" onAction="#addAction" prefHeight="31.0" prefWidth="130.0"  text="Add"  HBox.hgrow="ALWAYS" />

控制器按钮绑定：

@FXML
private Button addButton;

想要为按钮的快捷方式设置setOnAction的方法：

    public void addAction(ActionEvent event) throws SQLException, ClassNotFoundException {
    if (validateInput()) {
        String productName = productField.getText();
        double unitPrice = Double.parseDouble(priceField.getText());
        int quantity = Integer.parseInt(quantityField.getText());
        double total = unitPrice * quantity;
        ITEMLIST.add(new Item(productName, unitPrice, quantity, total));
        calculation();
        resetAdd();
        productTableView.getSelectionModel().clearSelection();
        ObservableList<Product> productsData = ProductDAO.searchProducts();
        populateProducts(productsData);
        searchField.setText("");
    }
}

initialize（）方法：

@FXML
private void initialize() throws SQLException, ClassNotFoundException, IOException {
  setSaveAccelerator(addButton);
}

我尝试使用setAccelerator的代码：

    private void setSaveAccelerator(final Button button) {
    Scene scene = button.getScene();
    if (scene == null) {
        throw new IllegalArgumentException("setSaveAccelerator must be called when a button is attached to a scene");
    }

    scene.getAccelerators().put(
            new KeyCodeCombination(KeyCode.S, KeyCombination.SHORTCUT_DOWN),
            new Runnable() {
                @FXML public void run() {
                    button.fire();
                }
            }
    );
}

Answer 1

在setSaveAccelerator方法中，只需指示按钮将其事件触发到其侦听器，例如：addAction(ActionEvent event)，而不是直接调用button.fire()。例如：

    private void setSaveAccelerator(Button button) {
        if(button==null) {
            System.out.println("Button is null! "); // check that the button was injected properly through your fxml
        }
        Scene scene = button.getScene();
        if (scene == null) {
            throw new IllegalArgumentException("setSaveAccelerator must be called when a button is attached to a scene");
        }

       scene.getAccelerators().put(
            new KeyCodeCombination(KeyCode.S, KeyCombination.SHORTCUT_DOWN),
            new Runnable() {
                @FXML public void run() {

                    button.fire();
                }
            }
       );
   }

修改

要避免IllegalArgumentException，必须在按钮附加到场景后附加加速器。我设法通过在控制器中创建一个公共方法来实现这一点，以便在设置场景后附加加速器。然后，在加载场景的类中，可以调用控制器的方法来设置该功能。请参阅以下示例：

在控制器类中（在我的情况下为MainController）：

public void setup() { setSaveAccelerator(button); }

加载fxml文件时在主类中：

FXMLLoader loader = new FXMLLoader(MainController.class.getResource("mainFXML.fxml")); AnchorPane page = (AnchorPane) loader.load(); MainController controller = loader.getController(); Scene scene = new Scene(page); controller.setup(); // calls the setup method attaching the accelerators

完整示例

主要课程：

public class Main extends Application{ public static Stage primaryStage; @Override public void start(Stage primaryStage) throws Exception { Main.primaryStage=primaryStage; FXMLLoader loader = new FXMLLoader(MainController.class.getResource("mainFXML.fxml")); AnchorPane page = (AnchorPane) loader.load(); MainController controller = loader.getController(); Scene scene = new Scene(page); primaryStage.setTitle("Shortcut example"); primaryStage.setScene(scene); controller.setup(); primaryStage.show(); } public static void main(String[] args) { launch(args); } }

Maincontroller：

public class MainController { @FXML private ResourceBundle resources; @FXML private URL location; @FXML private Button button; @FXML private AnchorPane rootPane; @FXML private TextArea textarea; @FXML void action(ActionEvent event) { textarea.setText("Action fired!!"); } @FXML void initialize() { assert button != null : "fx:id=\"button\" was not injected: check your FXML file 'MainFXML.fxml'."; assert rootPane != null : "fx:id=\"rootPane\" was not injected: check your FXML file 'MainFXML.fxml'."; assert textarea != null : "fx:id=\"textarea\" was not injected: check your FXML file 'MainFXML.fxml'."; } public void setup() { setSaveAccelerator(button); } private void setSaveAccelerator(Button button) { if(button==null) { System.out.println("Button null!!"); } Scene scene = button.getScene(); if (scene == null) { throw new IllegalArgumentException("setSaveAccelerator must be called when a button is attached to a scene"); } scene.getAccelerators().put( new KeyCodeCombination(KeyCode.S, KeyCombination.SHORTCUT_DOWN), new Runnable() { @FXML public void run() { button.fire(); } } ); } }

MainFXML.fxml

<AnchorPane fx:id="rootPane" prefHeight="408.0" prefWidth="330.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainController"> <children> <Button fx:id="button" layoutX="139.0" layoutY="350.0" mnemonicParsing="false" onAction="#action" text="Button" /> <TextArea fx:id="textarea" layoutX="73.0" layoutY="38.0" prefHeight="200.0" prefWidth="200.0" /> </children> </AnchorPane>

如何为按钮添加javafx快捷键组合

1 个答案: