Resize JavaFX Label if overrun

Question

I have a Label in a GridPane in a TitledPane. I want it to downsize stepwise by 0.05em if it is overrun so the three dots (\"Long Labe...\") dont show up -> \"Long Label\" i

Answer 1

Solution:

fontVerkleinerung(lblXYZ);   //call resizing at beginning


 lblXYZ.styleProperty().addListener((observable, oldV, newV) -> {
    fontVerkleinerung(lblXYZ);   //check size again if resized
 }); 


private void fontVerkleinerung(Label label) {
    Platform.runLater(() -> {
        tpBounds = tPane.getBoundsInLocal();
        if (label.getBoundsInLocal().getWidth()>tpBounds.getWidth() && !fontSizeFits) {
            fontSize = fontSize-0.02;
            label.setStyle("-fx-font-size: "+fontSize+"em;");
        }

        if (label.getBoundsInLocal().getWidth()<=tpBounds.getWidth() && !fontSizeFits) {
            fontSizeFits = true;
        }
    });
}

This workaround is not 100% satisfying, the GUI is suffering due to the slow graphic updaterate on label.setStyle("...");
It takes a few ms till the styleProperty-listener kicks in.
I tried to fix this for a few weeks now, always found a probably-solution but it didn't work. I hope somebody profits from this post.