javafx - 设置SplitPane的分隔线位置

Question

我想将 SplitPane 的分隔线设置为某个默认位置。这不起作用，分隔线保持在中间:

public void start(Stage primaryStage) throws Exception{

    SplitPane splitPane = new SplitPane(new Pane(), new Pane());

    // Report changes to the divider position
    splitPane.getDividers().get(0).positionProperty().addListener(
            o -> System.out.println(splitPane.getDividerPositions()[0])
    );

    // Doesn't work:
    splitPane.setDividerPositions(0.8);

    // The docs seem to recommend the following (with floats instead of
    // doubles, and with one number more than there are dividers, which is
    // weird), but it doesn't work either:
    //splitPane.setDividerPositions(0.8f, 0.2f);

    primaryStage.setScene(new Scene(splitPane));
    primaryStage.setMaximized(true);
    primaryStage.show();
}

输出:

0.8
0.5

这表明某些东西将其重置到中间。

我怎样才能实现这个目标？

Answer 1

问题似乎是在最大化 Stage 期间设置 SplitPane 宽度时，分隔线位置会重置。之后通过监听窗口的显示属性来设置分隔线位置，如下所示:

primaryStage.showingProperty().addListener(new ChangeListener<Boolean>() {

    @Override
    public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
        if (newValue) {
            splitPane.setDividerPositions(0.8);
            observable.removeListener(this);
        }
    }
});