It seems like you're looking for a TreeCell that can be styled differently based on the NodeType of the Node within its associated TreeItem. This customization can be achieved using CSS. Am I understanding your requirement correctly?
If my assumption is correct, there are two methods that come to mind to accomplish this task effectively, especially when dealing with a limited number of known NodeTypes. The first approach involves utilizing PseudoClass, while the second method mirrors the JavaFX Chart API's strategy.
First Approach
To begin with, create a custom TreeCell that caters to the specific Node type by declaring static final PseudoClass fields for each NodeType. Then, monitor the NodeType of the displayed Node in the TreeCell and update the corresponding PseudoClass states accordingly.
For instance, assuming NodeType is an enum with constants like HAPPY and
SAD</code:</p>
<pre><code>// Sample implementation of CustomTreeCell for NodeType handling
public class CustomTreeCell<T extends Node> extends TreeCell<T> {
// Implementation details as per the first option
}
In your CSS file:
.custom-tree-cell:happy {
/* Styles for happy state */
}
.custom-tree-cell:sad {
/* Styles for sad state */
}
Second Approach
Alternatively, consider following the approach adopted by the JavaFX Chart API for managing multiple data series. Dynamically update the style class of nodes based on their position/index.
// Code snippet illustrating the second option for Node styling
ChangeListener<NodeType> listener = (obs, oldVal, newVal) -> {
// Modify style classes based on NodeType
};
In your CSS:
.custom-tree-cell-happy {
/* Define styles here */
}
.custom-tree-cell-sad {
/* Define styles here */
}
Both approaches work well with a limited set of known NodeTypes but may become challenging to maintain with numerous dynamic types. Alternatively, consider programmatically setting text colors based on NodeType attributes for easier management.
Note: Please verify the code snippets provided as they have not been thoroughly tested for errors or exceptions.
Edit
If NodeType remains static for each Node, overriding the updateItem method defined in javafx.scene.control.Cell could simplify the process significantly. Review the documentation for guidelines on implementing this method effectively.