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我在 JavaFX2.2 中使用过 tableView。我有一列，其中保存了用户单击按钮时更新的值。这些值是动态填充的，直到这部分工作正常。但是，当我向下滚动表格以查看表格中的其他值时，单元格数据会发生变化。你能建议我需要做什么来解决这个问题吗？

这是我动态填充的表格单元格的代码，并且在向下滚动表格时会发生变化。

        Callback<TableColumn, TableCell> cellFactoryField = new Callback<TableColumn, TableCell>() {                

        @Override
        public TableCell call(final TableColumn param) {
            final Button button = new Button("Select Field");                    
            final TableCell cell = new TableCell() {

                @Override
                public void updateItem(Object item, boolean empty) {
                    super.updateItem(item, empty);
//                                label.setText("Here");                            
                    if (empty) {
//                                System.out.println("table cell inside updateitem = "+item);
//                                setGraphic(null);
                    }
                    else
                    {      

                    }
                }
            };
            button.setOnAction(new EventHandler<ActionEvent>() {
                private CheckBoxTreeItem<String> checkBoxTreeItem;
                private CheckBoxTreeItem<String> nodeFieldName;
                private CheckBoxTreeItem<String> nodeFieldName2;
                private CheckBoxTreeItem<String> nodeFieldName3;
                private Stage stage = new Stage();

                @Override public void handle(ActionEvent e) 
                {
                    CheckBoxTreeItem<String> rootItem = 
                        new CheckBoxTreeItem<String>("Tables");                            
                    rootItem.setExpanded(true);                  

                    final TreeView tree = new TreeView(rootItem);  
                    tree.setEditable(true);

                    tree.setCellFactory(CheckBoxTreeCell.<String>forTreeView());                                                            
                    {
                        checkBoxTreeItem = new CheckBoxTreeItem<String>("Sample Table" );//+ (i+1));                                
                        rootItem.getChildren().add(checkBoxTreeItem);                                                
                        nodeFieldName = new CheckBoxTreeItem<String>("Field Name1");                                
                        nodeFieldName2 = new CheckBoxTreeItem<String>("Field Name2");
                        nodeFieldName3 = new CheckBoxTreeItem<String>("Field Name3");
                        checkBoxTreeItem.getChildren().addAll(nodeFieldName, nodeFieldName2, nodeFieldName3);                    

                    }                                    
                    tree.setRoot(rootItem);
                    tree.setShowRoot(true);                            
                    StackPane root = new StackPane();                                
                    root.getChildren().add(tree);
                    Button selectButton = new Button("Select");
                    HBox hbox = new HBox();
                    hbox.getChildren().add(selectButton);
                    hbox.setAlignment(Pos.CENTER);
                    selectButton.setOnAction(new EventHandler<ActionEvent>(){

                        @Override
                        public void handle(ActionEvent t) {

                            final ArrayList<String> selectedValues = new ArrayList<String>(); 
     //                                    System.out.println("Selected tree items are : ");
                            if(checkBoxTreeItem.isSelected())
                                selectedValues.add(checkBoxTreeItem.getValue());
                            if(nodeFieldName.isSelected())
                                selectedValues.add(nodeFieldName.getValue());
                            if(nodeFieldName2.isSelected())
                                selectedValues.add(nodeFieldName2.getValue());
                            if(nodeFieldName3.isSelected())
                                selectedValues.add(nodeFieldName3.getValue());                               
                            stage.hide();                                
                            for(int i = 0; i<selectedValues.size();i++)
                            {
                                if(i == selectedValues.size()-1)
                                    selectedVals += selectedValues.get(i);    
                                else                                            
                                    selectedVals += selectedValues.get(i)+",";    
                            }
                            fieldNameChosen = true;
                            if(fieldNameChosen)
                                cell.setGraphic(new Label(selectedVals));
                            else
                                cell.setGraphic(button);
                        }
                    });
                    BorderPane borderPane = new BorderPane();
                    borderPane.setCenter(root);
                    borderPane.setBottom(hbox);
                    stage.setScene(new Scene(new Group(borderPane)));                             
                    stage.show();
                }
            });
            if(!(cell.getGraphic() instanceof Label))
                cell.setGraphic(button);
            return cell;
        }
    };
    fieldName.setCellFactory(cellFactoryField);

对于另一个需要动态显示另一个表中的值的字段，我遇到了类似的问题。下面是我使用的代码。

              final int k = 0;  
    value.setCellValueFactory(new Callback<CellDataFeatures<ObservableList, String>, ObservableValue<String>>() {
        int noOfDataCells = k;
        public ObservableValue<String> call(CellDataFeatures<ObservableList, String> param) 
        {                    

            TableColumn column = param.getTableColumn();
            int size = 0;
            if(tableView1.getItems()!=null)
                size = ((ObservableList) tableView1.getItems().get(0)).size();
            String valueFromData = "";
            if(noOfDataCells<size)
            {
                valueFromData = String.valueOf(((ObservableList) tableView1.getItems().get(0)).get(noOfDataCells));                                                               
            }
            else if(noOfDataCells == size)
            {
                noOfDataCells = 0;
                valueFromData = String.valueOf(((ObservableList) tableView1.getItems().get(0)).get(noOfDataCells));  
            }
            else if (noOfDataCells>size)
            {
                valueFromData = "";
            }
            noOfDataCells++;
            //TODO SET THE VALUE IN THE MODEL

// ((MetaTag) column.getTableView().getItems().get( // .getIndex())).setFieldName(selectedVals);

            return new SimpleStringProperty(valueFromData);

        }
    });
4

1 回答 1

0

还有下一个问题：

  1. 您正在使用表格编辑功能而没有实现所需的 API
  2. 您更新工厂中的单元格，但不会更新 Table 备份的数据
  3. 单元格在滚动时被破坏（出于性能原因）并重新创建，因此您的所有更改都会被破坏。

请参阅下一个有关 TableView 编辑正确方法的教程：http: //docs.oracle.com/javafx/2/ui_controls/table-view.htm

我还创建了一个小程序，它使用 TreeCheckBox 阶段通过双击单元格来更新表格。我已经用评论标记了最重要的地方。

public class TableCellEditing extends Application {

    private void init(Stage primaryStage) {
        StackPane root = new StackPane();
        primaryStage.setScene(new Scene(root, 400, 200));
        // you didn't provided data which your Tables use so example will work with Person class
        final ObservableList<Person> data = FXCollections.observableArrayList(
                new Person("click to edit", "Smith"),
                new Person("", "Johnson"),
                new Person("", "Williams1"),
                new Person("", "Williams2"),
                new Person("", "Williams3"),
                new Person("", "Williams4"),
                new Person("", "Williams5"),
                new Person("", "Jones"),
                new Person("", "Brown"),
                new Person("", "Brown2"));

        TableView tableView = new TableView();
        tableView.setItems(data);
        // make table editable
        tableView.setEditable(true);

        TableColumn lastNameCol = new TableColumn();
        lastNameCol.setText("Last");
        lastNameCol.setCellValueFactory(new PropertyValueFactory("lastName"));


        TableColumn firstNameCol = new TableColumn();
        firstNameCol.setText("First");
        // here you connect data list with table column
        firstNameCol.setCellValueFactory(new PropertyValueFactory("firstName"));
        // here you specify that your cells are special and provide editing hooks
        firstNameCol.setCellFactory(new Callback<TableColumn, TableCell>() {
            @Override
            public TableCell call(final TableColumn param) {

                final TableCell cell = new TableCell() {
                    @Override
                    // this method is called on editable tables by double click
                    public void startEdit() {
                        super.startEdit();
                        // here we create new Stage to select items from tree
                        new CheckBoxTreeStage(this).show();
                    }

                    @Override
                    public void updateItem(Object item, boolean empty) {
                        super.updateItem(item, empty);
                        if (empty) {
                            setText(null);
                        } else {
                            if (isEditing()) {
                                setText(null);
                            } else {
                                // this is the place where we update data by chosen value
                                setText(getItem().toString());
                                setGraphic(null);
                            }
                        }
                    }
                };
                return cell;
            }
        });

        tableView.getColumns().addAll(firstNameCol, lastNameCol);
        tableView.setFocusTraversable(false);
        root.getChildren().add(tableView);
    }

    // I've extracted your stage to a separate class for better readability
    private static class CheckBoxTreeStage extends Stage {

        private CheckBoxTreeItem<String> checkBoxTreeItem;
        private CheckBoxTreeItem<String> nodeFieldName;
        private CheckBoxTreeItem<String> nodeFieldName2;
        private CheckBoxTreeItem<String> nodeFieldName3;

        public CheckBoxTreeStage(final TableCell cell) {
            CheckBoxTreeItem<String> rootItem =
                    new CheckBoxTreeItem<String>("Tables");
            rootItem.setExpanded(true);

            final TreeView tree = new TreeView(rootItem);
            tree.setEditable(true);

            tree.setCellFactory(CheckBoxTreeCell.<String>forTreeView());
            {
                checkBoxTreeItem = new CheckBoxTreeItem<String>("Sample Table");//+ (i+1));                                
                rootItem.getChildren().add(checkBoxTreeItem);
                nodeFieldName = new CheckBoxTreeItem<String>("Field Name1");
                nodeFieldName2 = new CheckBoxTreeItem<String>("Field Name2");
                nodeFieldName3 = new CheckBoxTreeItem<String>("Field Name3");
                checkBoxTreeItem.getChildren().addAll(nodeFieldName, nodeFieldName2, nodeFieldName3);

            }
            tree.setRoot(rootItem);
            tree.setShowRoot(true);
            StackPane root = new StackPane();
            root.getChildren().add(tree);
            Button selectButton = new Button("Select");
            HBox hbox = new HBox();
            hbox.getChildren().add(selectButton);
            hbox.setAlignment(Pos.CENTER);
            selectButton.setOnAction(new EventHandler<ActionEvent>() {
                @Override
                public void handle(ActionEvent t) {

                    final ArrayList<String> selectedValues = new ArrayList<String>();
                    //                                    System.out.println("Selected tree items are : ");
                    if (checkBoxTreeItem.isSelected()) {
                        selectedValues.add(checkBoxTreeItem.getValue());
                    }
                    if (nodeFieldName.isSelected()) {
                        selectedValues.add(nodeFieldName.getValue());
                    }
                    if (nodeFieldName2.isSelected()) {
                        selectedValues.add(nodeFieldName2.getValue());
                    }
                    if (nodeFieldName3.isSelected()) {
                        selectedValues.add(nodeFieldName3.getValue());
                    }
                    hide();
                    String selectedVals = "";
                    for (int i = 0; i < selectedValues.size(); i++) {
                        if (i == selectedValues.size() - 1) {
                            selectedVals += selectedValues.get(i);
                        } else {
                            selectedVals += selectedValues.get(i) + ",";
                        }
                    }
                    boolean fieldNameChosen = true;
                    if (fieldNameChosen) {
                        cell.commitEdit(selectedVals);
                    } else {
                        cell.cancelEdit();
                    }
                }
            });
            BorderPane borderPane = new BorderPane();
            borderPane.setCenter(root);
            borderPane.setBottom(hbox);
            setScene(new Scene(new Group(borderPane)));
        }
    };

    public static class Person {

        private StringProperty firstName;
        private StringProperty lastName;

        private Person(String fName, String lName) {
            this.firstName = new SimpleStringProperty(fName);
            this.lastName = new SimpleStringProperty(lName);
        }

        public StringProperty firstNameProperty() {
            return firstName;
        }

        public StringProperty lastNameProperty() {
            return lastName;
        }
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
于 2012-09-14T13:32:42.553 回答