根据OP在其已编辑问题上显示的代码，此代码解决了以下事实：在显示阶段之前，在自定义类上在侦听器上创建了标题窗格。
@Override
public void start(Stage primaryStage) {
Scene scene = new Scene(new StackPane(), 300, 250);
primaryStage.setScene(scene);
primaryStage.setOnShown(e -> {
CustomTitledPane customTitledPane = new CustomTitledPane("Title", new StackPane(new Label("Graphic to the Right")));
scene.setRoot(customTitledPane);
customTitledPane.applyCss();
customTitledPane.layout();
// title region
Node titleRegion=customTitledPane.lookup(".title");
// padding
Insets padding=((StackPane)titleRegion).getPadding();
// image width
double graphicWidth=customTitledPane.getGraphic().getLayoutBounds().getWidth();
// arrow
double arrowWidth=titleRegion.lookup(".arrow-button").getLayoutBounds().getWidth();
// text
double labelWidth=titleRegion.lookup(".text").getLayoutBounds().getWidth();
double nodesWidth = graphicWidth+padding.getLeft()+padding.getRight()+arrowWidth+labelWidth;
customTitledPane.graphicTextGapproperty().bind(customTitledPane.widthproperty().subtract(nodesWidth));
});
primaryStage.show();
}
class CustomTitledPane extends TitledPane {
public CustomTitledPane(String titleText, Node node) {
super(titleText, node);
setAnimated(true);
setCollapsible(true);
ImageView img = new ImageView(new Image(getClass().getResource("unlock24.png").toExternalForm()));
img.setFitHeight(10d);
img.setPreserveRatio(true);
img.setSmooth(true);
setGraphic(img);
setContentDisplay(ContentDisplay.RIGHT);
}
}
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