Javafx, get the object referenced by a TableCell - javafx-2

Question

I have the following Callback listening on the selected Cell of a TableView:
Callback<TableColumn<MyFTPFile,String>, TableCell<MyFTPFile,String>> cellFactory =
new Callback<TableColumn<MyFTPFile,String>, TableCell<MyFTPFile,String>>() {
public TableCell<MyFTPFile,String> call(TableColumn<MyFTPFile,String> p) {
TableCell<MyFTPFile,String> cell = new TableCell<MyFTPFile, String>() {
#Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
setText(empty ? null : getString());
setGraphic(null);
}
private String getString() {
return getItem() == null ? "" : getItem().toString();
}
};
cell.addEventFilter(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
if (event.getClickCount() > 1) {
TableCell<MyFTPFile,String> c = (TableCell<MyFTPFile,String>) event.getSource();
ftpObservablelist = MyFTPClient.getInstance().getFtpObservableList();
ftpTable.setItems(ftpObservablelist);
}
}
});
Now, I would like to get the MyFTPFile object which is referenced by the cell, which is doubleclicked, so that i can pass it to another class and do stuff... Any Idea how to do that???
Thanks in advance.

Answer 1

The MyFTPFile object is associated with the cell's row, so, as the asker pointed out in his comment, it is retrievable via cell.getTableRow().getItem().
At first I thought this should be cell.getItem(), which returns the data value associated with the cell. However, most of the time, the cell data value will be a property of the backing item rather than the object itself (for example a filename field of a MyFTPFile object).
Executable sample for the curious:
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import javafx.util.Callback;
public class TableClickListener extends Application {
public static void main(String[] args) {
launch(args);
}
class FTPTableCell<S, T> extends TextFieldTableCell<S, T> {
FTPTableCell() {
super();
addEventFilter(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
if (event.getClickCount() > 1 && getItem() != null) {
System.out.println("Sending " + getTableRow().getItem() + " to the FTP client");
}
}
});
}
}
final Callback<TableColumn<MyFTPFile, String>, TableCell<MyFTPFile, String>> FTP_TABLE_CELL_FACTORY =
new Callback<TableColumn<MyFTPFile, String>, TableCell<MyFTPFile, String>>() {
public TableCell<MyFTPFile, String> call(TableColumn<MyFTPFile, String> p) {
return new FTPTableCell<>();
}
};
#Override
public void start(final Stage stage) {
final TableView<MyFTPFile> table = new TableView<>();
final TableColumn<MyFTPFile, String> filenameColumn = new TableColumn<>("Filename");
filenameColumn.setCellValueFactory(new PropertyValueFactory<MyFTPFile, String>("filename"));
filenameColumn.setCellFactory(FTP_TABLE_CELL_FACTORY);
filenameColumn.setMinWidth(150);
final TableColumn<MyFTPFile, String> ratingColumn = new TableColumn<>("Rating");
ratingColumn.setCellValueFactory(new PropertyValueFactory<MyFTPFile, String>("rating"));
ratingColumn.setCellFactory(FTP_TABLE_CELL_FACTORY);
ratingColumn.setMinWidth(20);
table.getColumns().setAll(filenameColumn, ratingColumn);
table.getItems().setAll(
new MyFTPFile("xyzzy.txt", 10),
new MyFTPFile("management_report.doc", 1),
new MyFTPFile("flower.png", 7)
);
table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
stage.setScene(new Scene(new Group(table)));
stage.show();
}
public class MyFTPFile {
private final String filename;
private final int rating;
MyFTPFile(String filename, int rating) {
this.filename = filename;
this.rating = rating;
}
public String getFilename() {
return filename;
}
public int getRating() {
return rating;
}
#Override
public String toString() {
return "MyFTPFile{" +
"filename='" + filename + '\'' +
", rating=" + rating +
'}';
}
}
}