javafx: attach ChoiceBox to a TableCell on a TableColumn during Edit

问题

The code below are instance methods of an object.

private StringProperty buySell;

// getters
public String getBuySell(){
    return this.buySell.get();
}

// return Property Object
public StringProperty buySellProperty(){
    return this.buySell;
}

// setters
public void setBuySell(String buySell){
    this.buySell.set(buySell);
}

In my Controller class, I have created a TableColumn for buySell string property with the code below.

When I created a transaction, there will be a new row on the tableView. However, I want to be able to edit the buySell tableCell.

Question: How can I embed a choicebox with values buy, sell within the setOnEdit function such that when I double click on the cell, it will give me a choicebox ?

I have my choicebox code below but I have no idea how to combine these things together.

    ChoiceBox<BuySell> buySellBox = new ChoiceBox<>();
    buySellBox.getItems().addAll("Buy", "Sell");

Update: Problem is still unresolved. However, by following the answer in this post, this is what I have got so far. After creating an object, a table row is created but when I click onto the table cell Buy to edit, nothing happens (I was expecting a drop down choice box to appear and let me re-select my choice).

My table is editable, since I am able to edit tableCell using Volume using the code above.

Added in the images below to show that I am able to edit the Volume tableCell , but not the buySell tableCell, whenever I click on it.

回答1:

Use a cell factory that creates a ChoiceBox in the cell when editing. see this answer.

Example:

    public class Main extends Application {

    @Override
    public void start(Stage stage) throws Exception {

        TableColumn<Item, String> col1 = new TableColumn("Column1");
        col1.setCellValueFactory(cellData -> cellData.getValue().nameProperty());
        col1.setCellFactory(column -> new TableCel_Edit());
        TableColumn<Item, Number> col2 = new TableColumn("Column2");
        col2.setCellValueFactory(cellData -> cellData.getValue().valueProperty());
        TableView<Item> table = new TableView();
        table.setEditable(true);
        table.getItems().addAll(loadData());
        table.getColumns().addAll(col1, col2);
        AnchorPane root = new AnchorPane();
        root.getChildren().add(table);
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String... args) {
        Application.launch(args);
    }

    private List<Item> loadData() {
        List<Item> list = new ArrayList();
        for (int i = 0; i < 10; i++) {
            Item item = new Item("item" + i, i);
            list.add(item);

        }
        return list;
    }

    private class TableCel_Edit extends TableCell<Item, String> {

        ChoiceBox<String> buySellBox = new ChoiceBox<>();

        public TableCel_Edit() {
            buySellBox.getItems().addAll("Buy", "Sell");
            buySellBox.getSelectionModel().selectedIndexProperty().addListener((obs, oldValue, newValue) -> {

                String value = buySellBox.getItems().get(newValue.intValue());
                processEdit(value);
            });

        }

        private void processEdit(String value) {
            commitEdit(value);
        }

        @Override
        public void cancelEdit() {
            super.cancelEdit();
            setText(getItem());
            setGraphic(null);
        }

        @Override
        public void commitEdit(String value) {
            super.commitEdit(value);
            // ((Item) this.getTableRow().getItem()).setName(value);
            setGraphic(null);
        }

        @Override
        public void startEdit() {
            super.startEdit();
            String value = getItem();
            if (value != null) {
                setGraphic(buySellBox);
                setText(null);
            }
        }

        @Override
        protected void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            if (item == null || empty) {
                setText(null);

            } else {
                setText(item);
            }
        }

    }

}

Update: in your controller class add the following:

fxTransactionLogBuySell.setCellValueFactory(new PropertyValueFactory<Transaction,String>("buySell"));
fxTransactionLogBuySell.setCellFactory(column -> new TableCel_Edit());

You should also add this class (change Item to Transaction ):

class TableCel_Edit extends TableCell<Item, String> {
....
}

来源：https://stackoverflow.com/questions/32026947/javafx-attach-choicebox-to-a-tablecell-on-a-tablecolumn-during-edit

标签

java

javafx