Getting a Boolean value JAVAFX

Question

I have a group of nodes within a GridPane and have some listeners adding and removing those nodes from the GridPane .

I was wondering if there is a way for me to create a get method(Boolean) or such to test if the nodes are currently in the GridPane or not.

I want to enable the button when the nodes aren't in the gridpane aka false .

Any help/thoughts appreciated!

Answer 1

这就是检查节点是否存在的方法：

gridpane.getChildren().contains(yourNode);

Answer 2

You can check if the parent of the Node node that you want to check is the GridPane . This should be a bit faster than using the child list, since it does not require iterating through the child list:

node.getParent() == gridPane

You can also use bindings to enable/disable the button (assuming there is a single node that decides, if the Button should be enabled or disabled)

button.disableProperty().bind(node.parentProperty().isEqualTo(gridPane));