设置SplitPane的分隔位置 [英] Set divider position of SplitPane

问题描述

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

I want to set the divider of a SplitPane to a certain default position. This does not work, the divider stays in the middle:

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

这表示有些东西会重置到中间。

It suggests that something resets it to the middle.

我该怎么办？实现这个？

How can I achieve this?

推荐答案

问题似乎是当 SplitPane的宽度时重置分隔符位置是在 Stage 最大化期间设置的。您应该可以通过收听窗口的显示属性来设置它：

The issue seems to be the divider position being reset when the width of the SplitPane is set during the maximizing of the Stage. You should be able to set it afterwards by listening to the showing property of the window:

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);
        }
    }

});

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