Getting a Boolean value JAVAFX - java

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!


That's how you can check for the presence of a node:
gridpane.getChildren().contains(yourNode);


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));

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You can remove labels from nodes using:
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I have a JTree structure as shown below. I have Icons that appear whenever a node has child nodes, which is working properly.
My problem is that I need to hide the ROOT node. When I hide the ROOT node, the Icons for MainTop1 and MainTop2 nodes are not displayed, even though they have children. To hide ROOT node I'm using "setRootVisible(false)".
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Anyone knows how to display the Icons for MainTop1 and MainTop2 when ROOT is hidden? Thanks in advance.
Below is my tree structure:
ROOT
MainTop1
Topic1
Subtopic1
Subtopic2
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JTree#setShowsRootHandles(boolean newValue) controls the state of the handles for root elements.
Normally, this is false. Try changing to true

The order of the factors affects the product:
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Create model
Add nodes to model
Create JTree
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simple example

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I have a application which uses a JTree. For each node in the tree, there is a checkbox attached to the node using a customized TreeCellRenderer. When some items of a node are selected i.e not all children of a node are selected using the chechboxes, how do i indicate using the checkbox of the parent node that only a partial list of nodes is selected. For this, i need to draw a little square in the checkbox indicating that it is partially selected.

You can use e.g.
http://www.roseindia.net/javatutorials/tristatecheckbox.shtml or
http://www.javaspecialists.co.za/archive/Issue082.html

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Thanks

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Have a fake child/child count and replace it with real children using TreeWillExpandListener

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