Add buttons to the row currently being edited - button

Question

I have tried searching both google and stackoverflow for answer to my question but I could not find any.
I have a program that adds/reads data from a database and to a tableview. I want to be able to edit the previously entered data from the tableview by adding two buttons (Save and abort) to the current row being edited.
I am having some troubles understanding the routines like Callback etc. But I have managed to get a column with two buttons to appear when I start the edit. But I get buttons on every column I just want the buttons on the currently
selected row. Also I don't really understand how to get the current object from the save-button to be able to save it.
And also how the abort-button should work to cancel all changes.
public void setUpTableView() {
columnAnkomstdatum.setCellValueFactory(new PropertyValueFactory<>("arrivalDate"));
columnSupplier.setCellValueFactory(new PropertyValueFactory<>("supplier"));
columnRadiopharmaceutical.setCellValueFactory(new PropertyValueFactory<>("radiopharmaceutical"));
columnActivity.setCellValueFactory(new PropertyValueFactory<>("startActivity"));
columnCalibrationdate.setCellValueFactory(new PropertyValueFactory<>("startDate"));
columnBatchNumber.setCellValueFactory(new PropertyValueFactory<>("batchNumber"));
columnContaminationControl.setCellValueFactory(new PropertyValueFactory<>("contaminationControll"));
columnRoom.setCellValueFactory(new PropertyValueFactory<>("room"));
columnUser.setCellValueFactory(new PropertyValueFactory<>("user"));
tableview.setEditable(true);
columnSupplier.setEditable(true);
columnSupplier.setCellFactory(ComboBoxTableCell.forTableColumn(supplierList));
columnSupplier.setOnEditCommit(t -> {
ArrayList<Radiopharmaceutical> radioListfromSupplier = new RadiopharmaceuticalDao().getRadiopharmaceuticalsBySupplierName(t.getNewValue().getSupplierName());
radioList = FXCollections.observableArrayList(radioListfromSupplier);
t.getRowValue().setSupplier(t.getNewValue());
columnRadiopharmaceutical.setCellFactory(ComboBoxTableCell.forTableColumn(radioList));
if(tableview.getColumns().size() <= 9) {
addButtonsToTable();
}
});
}
private void addButtonsToTable() {
TableColumn<RegRadio, Void> editRow = new TableColumn<>("Edit");
tableview.getColumns().add(editRow);
Callback<TableColumn<RegRadio, Void>, TableCell<RegRadio, Void>> cellFactory = new Callback<TableColumn<RegRadio,Void>, TableCell<RegRadio,Void>>() {
#Override
public TableCell<RegRadio, Void> call(final TableColumn<RegRadio, Void> param) {
final TableCell<RegRadio, Void> cell = new TableCell<RegRadio, Void>() {
private final Button btnSave = new Button("Save");
private final Button btnAbort = new Button("Avbryt");
{
btnSave.setOnAction((ActionEvent event) -> {
RegRadio rr = getTableView().getItems().get(getIndex());
System.out.println("Saved");
});
}
{
btnAbort.setOnAction((ActionEvent event) -> {
System.out.println("Abort");
});
}
#Override
public void updateItem(Void item, boolean empty) {
super.updateItem(item, empty);
if (empty) {
setGraphic(null);
} else {
HBox pane = new HBox(btnSave, btnAbort);
setGraphic(pane);
}
}
};
return cell;
}
};
editRow.setCellFactory(cellFactory);
tableview.getColumns().add(editRow);
}

Answer 1

In your updateItem callback you can check if the cell is in the selected row in order to decide if you should show the buttons or not. Additionally you also need a flag to check if the user is editing. Something like this:
#Override
public void updateItem(Void item, boolean empty) {
super.updateItem(item, empty);
var selectedCells = tableview.getSelectionModel().getSelectedCells();
if (empty || !isEditing || selectedCells.isEmpty || getTableRow().getIndex() != selectedCells.get(0).getRow()) {
setGraphic(null);
} else {
HBox pane = new HBox(btnSave, btnAbort);
setGraphic(pane);
}
}
Another approach would be to change the visibility of the buttons depending on whether the cell is in the selected row:
#Override
public void updateItem(Void item, boolean empty) {
super.updateItem(item, empty);
if (empty) {
setGraphic(null);
} else {
HBox pane = new HBox(btnSave, btnAbort);
var selectedCells = tableview.getSelectionModel().getSelectedCells();
pane.setVisible(!selectedCells.isEmpty() && getTableRow().getIndex() == selectedCells.get(0).getRow())
setGraphic(pane);
}
}
(I haven't compiled and tested these code samples)