TableView - 单元格的上移和下移功能

Question

我有一个TableView 的情况。我正在尝试实现一个允许向上或向下移动单元格的功能。向上或向下移动单元格（带有单元格内容）后，我想将焦点更改为单元格的新位置。

问题是它不会更改到新位置。由于某种原因，它停留在原来选定的单元格位置。

这是用于上移、下移和改变焦点的代码：

我正在尝试移动单个选定的单元格。

public class TableController
{
    private ObservableList<SimpleStringProperty> observablePrnPropertyData;

    @FXML
    private TableView<SimpleStringProperty> table;
    @FXML
    private TableColumn<SimpleStringProperty, String> data;        

    @FXML
    private void initialize()
    {
        this.data.setCellValueFactory(cellData -> cellData.getValue());
        this.data.setCellFactory(event -> new EditCell(this.observablePrnPropertyData, this.table));
    }

    public void display(final PrnProperty prnProperty)
    {
        this.observablePrnPropertyData = PrnPropertyUtil.getObservableDataFromPrnProperty(prnProperty);
        this.table.setItems(this.observablePrnPropertyData);
    }


    private final class EditCell extends TableCell<SimpleStringProperty, String>
    {
        @Override
        public void updateItem(String item, boolean empty)
        {
            super.updateItem(item, empty);

            if (empty)
            {
                this.setText(null);
                this.setGraphic(null);
            }
            else
            {
                this.setUpContextMenu();

                this.setText(this.getString());
                this.setGraphic(null);
            }
        }

        private void setUpContextMenu()
        {
            // Context menu
            ContextMenu contextMenu = new ContextMenu();

            // context menu Move up
            this.moveUp = new MenuItem("Move up");
            this.moveUp.setOnAction(event -> this.moveUp(this.table, this.observablePrnPropertyData));
            contextMenu.getItems().add(this.moveUp);

            // Context menu for move down
            this.moveDown = new MenuItem("Move down");
            this.moveDown.setOnAction(event -> this.moveDown(this.table, this.observablePrnPropertyData));
            contextMenu.getItems().add(this.moveDown);

            // Add context menu
            this.setContextMenu(contextMenu);
        }

        public void moveUp(final TableView<?> table, ObservableList listToManipulate)
        {
            final int selectedIndex = table.getSelectionModel().getSelectedIndex();

            final Object removeItem = listToManipulate.remove(selectedIndex);

            final int newIndex = selectedIndex - 1;
            listToManipulate.add(newIndex, removeItem);
            this.changeTableCellFocus(table, newIndex);
        }

        public void moveDown(final TableView<?> table, ObservableList listToManipulate)
        {
            final int selectedIndex = table.getSelectionModel().getSelectedIndex();

            final Object remove = listToManipulate.remove(selectedIndex);

            final int newIndex = selectedIndex + 1;
            listToManipulate.add(newIndex, remove);
            this.changeTableCellFocus(table, newIndex);
        }

        public void changeTableCellFocus(final TableView<?> table, final int focusIndex)
        {
            table.requestFocus();
            table.getSelectionModel().clearAndSelect(focusIndex);
            table.getFocusModel().focus(focusIndex);
        }
    }
}

如果有人能给出一个可行的例子，那就太好了。我真的很想知道我做错了什么。

Answer 1

对于您的情况，使用此代码可以正常工作，很简单，您必须首先获取所选索引，将项目移动到下一个（或上一个）行，然后选择这个新行。

void upClicked(){
    if(table.getSelectionModel().getSelectedItem() != null) // check if the user really selected a row in the table
    {
        if(table.getSelectionModel().getSelectedIndex() != 0) // if the row first one so do nothing
        {
            int index = table.getSelectionModel().getSelectedIndex(); // get the selected row index
            SimpleStringProperty x = table.getSelectionModel().getSelectedItem(); // get the selected item
            table.getItems().set(index, table.getItems().get(index-1)); // move the selected item up
            table.getItems().set(index-1, x); // change the row with the item in above
            table.getSelectionModel().select(index-1); // select the new row position
        }
    }
}

void downClicked(){
    if(table.getSelectionModel().getSelectedItem() != null)
    {
        if(table.getSelectionModel().getSelectedIndex() != table.getItems().size()-1) // if the row is in last so dont do nothing
        {
            int index = table.getSelectionModel().getSelectedIndex();
            SimpleStringProperty x = table.getSelectionModel().getSelectedItem();
            table.getItems().set(index, table.getItems().get(index+1));
            table.getItems().set(index+1, x);
            table.getSelectionModel().select(index+1);
        }
    }
}

Answer 2

如果您只需要关注下一行和上一行，您可以尝试：table.getFocusModel().focusNext() 和 .focusPrevious()，如下所述：http://docs.oracle.com/javafx/2/api/javafx/scene/control/FocusModel.html