How to get column totals of TableView with editable columns? - javafx

Question

I have a table view that shows the time sheets of employees working hours on different projects, from Monday to Friday. The data source is a list of time sheet classes with float properties to each day of the week. I would like to, for instance, show a value that adds all the hours from the Monday column and show a Monday Hours total. I thought it would be easy to do with a little research because, to me, wanting a column total would be common in data driven applications that would use TableViews but I can't seem to find an elegant answer, or really any answer at all. It would be easier if I could just calculate a column total whenever the list of timesheets changed, but I also have to listen for when the column values change/are edited by the user. Any ideas?

Answer 1

Here is a non-tornadofx version. In setOnEditCommit, update the observable list and sum the column.
Main
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.CellEditEvent;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.StringConverter;
public class App extends Application
{
public static void main(String[] args)
{
launch(args);
}
#Override
public void start(Stage primaryStage)
{
Label total = new Label("0");
ObservableList<Time> data = FXCollections.observableArrayList();
data.add(new Time(0));
data.add(new Time(3));
TableView<Time> tableView = new TableView();
tableView.setEditable(true);
tableView.setItems(data);
total.setText(Integer.toString(data.stream().mapToInt(Time::getHours).sum()));
TableColumn<Time, Integer> column1 = new TableColumn("Time");
column1.setCellValueFactory(new PropertyValueFactory<>("hours"));
column1.setCellFactory(TextFieldTableCell.forTableColumn(new StringConverter<Integer>()
{
#Override
public String toString(Integer t)
{
return Integer.toString(t);
}
#Override
public Integer fromString(String string)
{
return Integer.parseInt(string);
}
}));
column1.setOnEditCommit((CellEditEvent<Time, Integer> t) -> {
((Time) t.getTableView().getItems().get(
t.getTablePosition().getRow())).setHours(t.getNewValue());
total.setText(Integer.toString(data.stream().mapToInt(Time::getHours).sum()));
});;
tableView.getColumns().add(column1);
VBox vbox = new VBox(tableView, total);
Scene scene = new Scene(vbox);
primaryStage.setScene(scene);
primaryStage.show();
}
}
Time
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
public class Time
{
private final IntegerProperty hours = new SimpleIntegerProperty();
public Time(int hours)
{
this.hours.set(hours);
}
public IntegerProperty hoursProperty()
{
return hours;
}
public void setHours(int hours)
{
this.hours.set(hours);
}
public Integer getHours()
{
return this.hours.getValue();
}
}