JavaFX 2 TableView : different cell factory depending on the data inside the cell

Question

I am trying to use the table view to render / edit the \"key = value\" pairs. So the table is supposed to have two columns : \"key\" and \"value\". Key is just a normal stri

Answer 1

Here is a table displaying pairs of Strings and Objects of various types.

A custom cell factory is used to handle display of different object types (by performing an instanceof check on the object's type and rendering the appropriate text or graphic).

import javafx.application.*;
import javafx.beans.property.ReadOnlyObjectWrapper;
import javafx.beans.value.ObservableValue;
import javafx.collections.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.image.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.util.Callback;
import javafx.util.Pair;

public class PairTable extends Application {
    public static final String NAME_COLUMN_NAME  = "Name";
    public static final String VALUE_COLUMN_NAME = "Value";

    final TableView> table = new TableView<>();

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

    public void start(final Stage stage) throws Exception {
        // model data
        ObservableList> data = FXCollections.observableArrayList(
                pair("Song", "Bach Cello Suite 2"),
                pair("Image", new Image("http://upload.wikimedia.org/wikipedia/en/9/99/Bach_Seal.jpg")),
                pair("Rating", 4),
                pair("Classic", true),
                pair("Song Data", new byte[]{})
        );

        table.getItems().setAll(data);
        table.setPrefHeight(275);

        // table definition
        TableColumn, String> nameColumn = new TableColumn<>(NAME_COLUMN_NAME);
        nameColumn.setPrefWidth(100);
        TableColumn, Object> valueColumn = new TableColumn<>(VALUE_COLUMN_NAME);
        valueColumn.setSortable(false);
        valueColumn.setPrefWidth(150);

        nameColumn.setCellValueFactory(new PairKeyFactory());
        valueColumn.setCellValueFactory(new PairValueFactory());

        table.getColumns().setAll(nameColumn, valueColumn);
        valueColumn.setCellFactory(new Callback, Object>, TableCell, Object>>() {
            @Override
            public TableCell, Object> call(TableColumn, Object> column) {
                return new PairValueCell();
            }
        });

        // layout the scene.
        final StackPane layout = new StackPane();
        layout.getChildren().setAll(table);
        Scene scene = new Scene(layout);
        stage.setScene(scene);
        stage.show();
    }

    private Pair pair(String name, Object value) {
        return new Pair<>(name, value);
    }
}

class PairKeyFactory implements Callback, String>, ObservableValue> {
    @Override
    public ObservableValue call(TableColumn.CellDataFeatures, String> data) {
        return new ReadOnlyObjectWrapper<>(data.getValue().getKey());
    }
}

class PairValueFactory implements Callback, Object>, ObservableValue