Question

我正在制作一个购物清单应用程序，它具有将项目添加到列表（tableview）以及项目和价格的功能。它是的，它的工作原理（因为tableview没有说“表中没有内容”）但表格是空白的。有什么建议？代码：

package listproject;



public class Main extends Application{

public Node getNodeByRowColumnIndex(final int row,final int column,GridPane gridPane) {
    Node result = null;
    ObservableList<Node> childrens = gridPane.getChildren();
    for(Node node : childrens) {
        if(gridPane.getRowIndex(node) == row && gridPane.getColumnIndex(node) == column) {
            result = node;
            break;
        }
    }
    return result;
}

ObservableList<Product> data =
        FXCollections.observableArrayList(

        );

@Override
public void start(Stage primaryStage) {
    primaryStage.setTitle("Grocery List");
    primaryStage.setWidth(450);
    primaryStage.setHeight(800);
    //menu buttons
    Button addLinkMain = new Button("Add an Item");
    Button addLinkTitle = new Button("Add an Item");
    Button mainLinkAdd = new Button("Back");
    Button mainLinkTitle = new Button("Back");
    Button addItem = new Button("Add");
    Button setTitleMenu = new Button("Set Title");
    Button setTitleAdd = new Button("Set Title");
    Button clear = new Button("Clear");

    //items for the item addition screen
    TextField title = new TextField("Name");
    TextField quantity = new TextField("#");
    TextField price = new TextField("$");
    HBox addBox = new HBox();
    BorderPane addBorder = new BorderPane();
    HBox addMenu = new HBox();
    //mainScene items
    BorderPane pane = new BorderPane();

    HBox mainscenemenu=new HBox();


    TableView<Product> tableview = new TableView<Product>();

    //tableview items
    TableColumn itemTitle=new TableColumn("Product");
    TableColumn itemQuantity=new TableColumn("Quantity");
    TableColumn itemPrice=new TableColumn("Price");

    //settitle items
    TextField listTitle= new TextField("Rename the List");
    Button setTittle = new Button("Set List Title");
    BorderPane setTitlePane=new BorderPane();
    StackPane setTitleFieldContainer=new StackPane();
    HBox setTitleOwnMenu = new HBox();
    //Scene declaration
    Scene mainScene = new Scene(pane);
        primaryStage.setScene(mainScene);
    Scene addScene = new Scene(addBorder);
    Scene setTitleScene = new Scene(setTitlePane);
    //Main Scene    
    pane.setCenter(tableview);
    pane.setBottom(mainscenemenu);
    tableview.getColumns().addAll(itemTitle,itemQuantity,itemPrice);
    mainscenemenu.getChildren().addAll(setTitleMenu,clear,addLinkMain);
    tableview.setItems(data);
    //Item Addition Scene
    addBox.getChildren().addAll(title,quantity,price);
    addMenu.getChildren().addAll(mainLinkAdd,addItem,setTitleAdd);
    addBorder.setCenter(addBox);
    addBorder.setBottom(addMenu);

    //Set Title Scene
    setTitleFieldContainer.getChildren().addAll(listTitle);
    setTitleOwnMenu.getChildren().addAll(addLinkTitle,setTittle,mainLinkTitle);
    setTitlePane.setCenter(setTitleFieldContainer);
    setTitlePane.setBottom(setTitleOwnMenu);
    //Menu Button Event Handlers
    addLinkMain.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent e) {
            primaryStage.setScene(addScene);
        }
    });
    addLinkTitle.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent e) {
            primaryStage.setScene(addScene);
        }
    });
    mainLinkAdd.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent e) {
            primaryStage.setScene(mainScene);          
        }
    });
    mainLinkTitle.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent e) {
            primaryStage.setScene(mainScene);          
        }
    });
    setTitleMenu.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent e) {
            primaryStage.setScene(setTitleScene);          
        }
    });
    setTitleAdd.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent e) {
            primaryStage.setScene(setTitleScene);          
        }
    });

    //Adding an Item to the List *unfinished
    addItem.setOnAction(new EventHandler<ActionEvent>(){


        @Override
        public void handle(ActionEvent event) {

            data.add(new Product(title.getText(),quantity.getText(),price.getText()));

        }

    });

    //Changing the Title of The List

    setTittle.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent event) {
            primaryStage.setTitle(listTitle.getText());
        }

    });

    //Clearing the List

    clear.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent event) {
            tableview.getItems().clear();
        }

    });

    //Show the Stage
    primaryStage.show();
}

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

}

Answer 1

您永远不会为表格的列设置cellValueFactory。您需要执行此操作以指定应在列中显示的项目部分。

可以在此处找到匿名类为cellValueFactory的示例。

使用PropertyValueFactory可以减少所需的代码量。更多关于这一点。

可在此处找到教程：https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/table-view.htm

尝试通过ObservableList将项添加到JavaFX TableView时，TableView项将不会显示

1 个答案: