Javafx 2 : How do I delete a row or column in Gridpane - javafx-2

Question

If I want to add a row of text fields programatically in JavaFx, i can simply use the gridpane add method
This adds a set of text fields to row 1.
for (int i = 0; i < Fields.size(); i++) {
gridpane.add(new TextField(), i, 1);
}
Similarly, How do I delete a row?. I dont find a suitable method to delete a row/column conveeniently in JavaFX.

Answer 1

There's no directly equivalent method. To remove nodes, just use
gridpane.getChildren().remove(...); or gridpane.getChildren().removeAll(...); and pass in the nodes you want to remove from the pane.

Answer 2

In Java 8+, you can use removeIf:
gridPane.getChildren().removeIf(node -> GridPane.getRowIndex(node) == rowNumber);
Caveat
If removing items from the 0th row, also check GridPane.getRowIndex(node) == null, i.e.,
node -> GridPane.getRowIndex(node) == null || GridPane.getRowIndex(node) == 0
(I think this is JavaFX leaving the row number as null when no row number is given in the corresponding element in FXML, even though giving no row number in FXML means the element is in the 0th row, since the default row is the 0th row.)

Answer 3

This works pretty well:
while(MainGridPane.getRowConstraints().size() > 0){
MainGridPane.getRowConstraints().remove(0);
}
while(MainGridPane.getColumnConstraints().size() > 0){
MainGridPane.getColumnConstraints().remove(0);
}

Answer 4

JavaFX APIs are pretty lacking (like easily removing rows from GridPane) and unintuitive (like returning null instead 0 for GridPane.getRowIndex). Here is solution I came up with:
Utils:
package io.github.againpsychox.javaspeedrunsapp.utils;
import javafx.scene.Node;
import javafx.scene.layout.GridPane;
public class GridPaneUtils {
/**
* Gets row index constrain for given node, forcefully as integer: 0 as null.
* #param node Node to look up the constraint for.
* #return The row index as primitive integer.
*/
public static int getRowIndexAsInteger(Node node) {
final var a = GridPane.getRowIndex(node);
if (a == null) {
return 0;
}
return a;
}
/**
* Removes row from grid pane by index.
* Note: Might not work correctly if row spans are used.
* #param grid Grid pane to be affected.
* #param targetRowIndexIntegerObject Target row index to be removed. Integer object type, because for some reason `getRowIndex` returns null for children at 0th row.
*/
public static void removeRow(GridPane grid, Integer targetRowIndexIntegerObject) {
final int targetRowIndex = targetRowIndexIntegerObject == null ? 0 : targetRowIndexIntegerObject;
// Remove children from row
grid.getChildren().removeIf(node -> getRowIndexAsInteger(node) == targetRowIndex);
// Update indexes for elements in further rows
grid.getChildren().forEach(node -> {
final int rowIndex = getRowIndexAsInteger(node);
if (targetRowIndex < rowIndex) {
GridPane.setRowIndex(node, rowIndex - 1);
}
});
// Remove row constraints
grid.getRowConstraints().remove(targetRowIndex);
}
}
Example usage:
GridPaneUtils.removeRow(this.grid, GridPane.getRowIndex(this.idTextField));
Posting my solution for further readers...