Question

我有两个不同的控制器，有两个不同的FXML视图。第一个控制器是CashierController，里面有按钮打开新场景和新控制器AddProductController。在这个收银员控制器中，购物车被初始化以根据购物车项目填充tableview。

第二，打开Addproductcontroller时，点击那个带有新场景的按钮，而prev cashiercontroller仍然打开。内部AddProductController有gridpane，当选择gridpane里面的任何单元格时，将产品添加到购物车。

问题是购物车没有更新，我无法刷新列表并重建表，因为CashierController中的方法。我是如何将数据传回给仍然打开的前一个控制器，而我仍处于当前状态（addproductController）。如何在2个控制器之间进行通信以接收或从新到现场侦听事件。

    public class CashierController implements Initializable {

        public Button btnAdd;
        public JFXButton btnExit;
        public TableView<Item> tableView;
        public TableColumn<Item, String> colQty;
        public TableColumn<Item, String> colName;
        public TableColumn<Item, String> colPrice;
        public JFXTextField txtBarcode;

        @FXML
        private Label lblAmount;
        @FXML
        private Label lblInfo;

        Cart cart;

        ProductModel productModel;

    //    private CashierController (){}
    //
        public static CashierController getInstance(){
            return CashierControllerHolder.INSTANCE;
        }

        private static class CashierControllerHolder {
            private static final CashierController INSTANCE = new CashierController();
        }

        @Override
        public void initialize(URL location, ResourceBundle resources) {

            productModel = new ProductModel();
            cart = new Cart();  
        }

        public void calculateView() {
            lblSubtotal.setText(cart.getSubTotal().toString());
            lblTax.setText(cart.getChargesTax().toString());
            lblTotal.setText(cart.getTotal().toString());
        }

        public void refreshList() {
            ObservableList<Item> items = FXCollections.observableArrayList(cart.getItemList());
setCellTable();
            tableView.setItems(items);
        }

        public void addToCart(Product product) {
            cart.add(product.getId(), product.getBarcode(),product.getName(), 1, product.getPrice_sell());
        }

        public void addProductAction(ActionEvent actionEvent) {
            try {
                FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/views/subview/addProduct.fxml"));
                Parent root1 = (Parent) fxmlLoader.load();
                Stage stage = new Stage();
                stage.setScene(new Scene(root1));
                AddProductController addProductControllerController = fxmlLoader.getController();
                fxmlLoader.setController(addProductControllerController);
                stage.show();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        public void setCellTable(){

            colQty.setCellValueFactory(new PropertyValueFactory<>("quantity"));
            colName.setCellValueFactory(new PropertyValueFactory<>("name"));
            colPrice.setCellValueFactory(
                    cellData ->{
                        SimpleStringProperty property = new SimpleStringProperty();
                        property.set(df1.format(cellData.getValue().getTotal()));
                        return property;
                    });

        }
    }

这是AddProducController

    public class AddProductController implements Initializable , ProductInterface {

    @FXML
    public Tab tabAll;
    @FXML
    public BorderPane borderPaneAll;
    public JFXButton btnExit;

    private GridPane gridPane = new GridPane();
    private ProductModel productModel;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        productModel = new ProductModel();
        loadData();

        Label[] label = new Label[PRODUCTLIST.size()];
        Label[] labelBarcode = new Label[PRODUCTLIST.size()];
        Label[] labelPrice = new Label[PRODUCTLIST.size()];
        VBox vBoxes[] = new VBox[4];

        int cols=2, colCnt = 0, rowCnt = 0;
        for (int i=0; i<PRODUCTLIST.size(); i++) {

            label[i] = new Label();
            labelBarcode[i] = new Label();
            labelPrice[i] = new Label();

            label[i].setText(PRODUCTLIST.get(i).getName());
            labelBarcode[i].setText(PRODUCTLIST.get(i).getBarcode());
            labelPrice[i].setText(String.valueOf(PRODUCTLIST.get(i).getPrice_sell()));

            vBoxes[i] = new VBox(5);
            vBoxes[i].getChildren().addAll(label[i],labelBarcode[i], labelPrice[i]);

            gridPane.add(vBoxes[i], colCnt, rowCnt);
            gridPane.setHgap(20);
            gridPane.setVgap(20);
            colCnt++;
            if (colCnt>cols) {
                rowCnt++;
                colCnt=0;
            }
        }
        borderPaneAll.setCenter(gridPane);

        addGridEvent();

    }


    private void addGridEvent() {
        gridPane.getChildren().forEach(item -> {
            item.setOnMouseClicked(new EventHandler<MouseEvent>() {
                String name = null;
                String barcode = null;
                BigDecimal price = new BigDecimal(0.00);
                List<String> t = new ArrayList<>();
                @Override
                public void handle(MouseEvent event) {
                    if (event.getClickCount() == 2) {
                        if(item instanceof VBox){
                            for(Node nodeIn: ((VBox) item).getChildren()){

                                if(nodeIn instanceof Label){
                                    t.add(((Label)nodeIn).getText());
                                }
                            }
                        }

                        name = t.get(0);
                        barcode = t.get(1);
                        price = new BigDecimal(t.get(2));

                        Product product = productModel.getProductByBarcode(barcode);
                        //add product to cart
                        CashierController.getInstance().addToCart(product);
                        //refreshthelist
                        //calculatethevalue

//                        CashierController.getInstance().refreshList();
//                        CashierController.getInstance().calculateView();

                    }
                    if (event.isPrimaryButtonDown()) {
                        System.out.println("PrimaryKey event");
                    }

                }
            });

        });


    }

    private void loadData(){
        if (!PRODUCTLIST.isEmpty()) {
            PRODUCTLIST.clear();
        }
        PRODUCTLIST.addAll(productModel.getProducts());
    }


}

添加到购物车的产品是在网格窗格内点击。我尝试使用静态实例但在null异常中出错。提前谢谢。

Answer 1

更改

AddProductController addProductControllerController = fxmlLoader.getController();
fxmlLoader.setController(addProductControllerController);
stage.show();

到

AddProductController addProductControllerController = fxmlLoader.getController();
fxmlLoader.setController(addProductControllerController);
stage.showAndWait();

“showAndWait”命令之后列出的所有代码将等待对话框关闭，然后再运行。所以基本上你可以为AddProductController返回的任何数据放置一个公共getter方法，并在stage.showAndWait

之后在主CashierController中调用它。

像这样的东西

AddProductController addProductControllerController = fxmlLoader.getController();
fxmlLoader.setController(addProductControllerController);
stage.showAndWait();
Product product = addProductControllerController.getScannedProduct();

javafx将数据发送回上一个控制器

1 个答案: