Get graphic of TableCell - tableview

Question

I have implemented a custom TableCell & TableColumn to show a hyperlink while the cell is not editing. I want to add setOnAction event for the hyperlink. As i want to reuse the TableCell i cannot add the code in TableCell updateItem method. Is there any way to implement this?
public class TableColumnHyperlink<S> extends TableColumn<S, String> {
public TableColumnHyperlink (String header) {
super(header);
Callback<TableColumn<S, String>, TableCell<S, String>> hypCellFactory =
(TableColumn<S, String> p) -> new TableCellHyperlink();
setCellFactory(hypCellFactory);
}
}
And the TableCell implementation is
public class TableCellHyperlink<S> extends TableCell<S, String> {
private final TextField textField;
private final Hyperlink hyperlink;
public TableCellHyperlink() {
textField = new TextField();
hyperlink = new Hyperlink();
setAlignment(Pos.CENTER_LEFT);
}
#Override
public void startEdit() {
super.startEdit();
createTextField();
setText(null);
setGraphic(textField);
textField.requestFocus();
}
#Override
public void cancelEdit() {
super.cancelEdit();
setText(getItem());
setGraphic(null);
}
#Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty && (getTableRow() == null ? true : getTableRow().isEmpty()));
if (empty) {
setText(null);
setGraphic(null);
} else {
if(isEditing()) {
setText(getString());
setGraphic(textField);
} else {
setText(null);
hyperlink.setText(getString());
setGraphic(hyperlink);
}
}
}
private void createTextField() {
textField.setText(getString());
textField.setMinWidth(this.getWidth() - this.getGraphicTextGap() * 2);
textField.addEventFilter(KeyEvent.KEY_PRESSED, (KeyEvent t) -> {
if (t.getCode() == KeyCode.ENTER) {
commitEdit(textField.getText());
} else if (t.getCode() == KeyCode.ESCAPE) {
cancelEdit();
}
});
}
private String getString() {
return (getItem() != null)?getItem():"";
}
}

Answer 1

If the event handler implementation will vary by instance, you need to pass the event handler (or a function) into the constructor. Since you probably need to access the cell, you'll do something like
public class TableCellHyperlink<S> extends TableCell<S, String> {
private final TextField textField;
private final Hyperlink hyperlink;
public TableCellHyperlink(Consumer<TableCellHyperlink<S> handlerFunction) {
textField = new TextField();
hyperlink = new Hyperlink();
hyperlink.setOnAction(event -> handlerFunction.accept(this));
setAlignment(Pos.CENTER_LEFT);
}
// ...
}
Now you can do something like
TableCellHyperlink<MyType> hyperlinkCell = new TableCellHyperlink<>(cell -> {
MyType rowValue = (MyType) cell.getTableRow().getValue(); // getTableRow() returns TableRow, not TableRow<MyType>
String cellValue = cell.getItem();
// implement action
});
Obviously you can move the parameter up and pass it into the custom TableColumn constructor if you like.