How to access a cell that is generated in a GridPane? - javafx

Question

I need to add a shape into a specific cell (middle centered one) in my GridPane.
This is how cells (StackPane) are made in my GridPane:
private StackPane createCell() {
StackPane cell = new StackPane();
cell.getStyleClass().add("cell");
return cell;
}
I have tried to get the centered cell with this piece of method:
private Node getCenteredNodeGridPane(GridPane gridPane, int col, int row) {
for (Node node : gridPane.getChildren()) {
if (GridPane.getColumnIndex(node) == col/2 && GridPane.getRowIndex(node) == row/2) {
return node;
}
}
return null;
}
And then, get the node:
Node centeredNode = getCenteredNodeGridPane(grid, 20, 20);
centeredNode ...... ??????
But i have no access to the actual StackPane of this node.
I need something like,
centeredNode.getChildren().add(shape);

Answer 1

Assuming you only add StackPanes as child nodes of the grid pane, you just need to cast the result:
StackPane centeredNode = (StackPane) getCenteredNodeGridPane(grid, 20, 20);
Depending on your exact requirements, you could of course do this in your getCenteredNodeGridPane method, and add type checking:
private StackPane getCenteredNodeGridPane(GridPane gridPane, int col, int row) {
for (Node node : gridPane.getChildren()) {
if (node instanceof StackPane
&& GridPane.getColumnIndex(node) == col/2
&& GridPane.getRowIndex(node) == row/2) {
return (StackPane) node;
}
}
return null;
}