How to Accurately Get Node Height in JavaFX Before Layout?

Getting Node Height in JavaFX

To obtain the height of a node in JavaFX, it is necessary to follow these steps:

1. Create the nodes to be placed in the VBoxes.
2. Add them to a temporary scene (that can be a dummy scene without a stage attachment but with matching CSS rules to your main scene).
3. Call both applyCss() and layout() on each node (or on the dummy scene root).
4. Measure the layout bounds of the nodes.
5. Add the nodes to the VBoxes in your actual scene based on your layout algorithm.

Explanation

JavaFX layout calculations involve applying CSS styles and executing a layout pass. This process typically occurs during a "pulse" (an automated check for dirty objects in the scene); however, if you require node size measurements before the layout occurs, you need to manually trigger CSS application and the layout pass.

Alternative

An alternative approach is to override the layoutChildren() method of the parent node to handle the adjustment of children nodes during the layout pass. However, this involves overriding other methods such as computePrefHeight() for accurate size calculations.

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