java - 有没有办法在没有事件处理程序的情况下等待按钮点击？

Question

有什么方法可以在按下“确定”按钮时返回某个整数，并在按下右上角的退出按钮时返回另一个数字？

编辑:这只是从一个更大的类中取出的方法。请假设该窗口已显示。我要求的是确保返回任意两个数字的代码，但前提是按下按钮。

<小时/>

public static int showMessageDialog(String title, String object_message){
    stage = new Stage();
    stage.setMinHeight(150);
    stage.setMinWidth(250);
    stage.setTitle(title);

    ok = new Button("OK");

    gridPane = new GridPane();
    gridPane.setAlignment(Pos.CENTER);
    gridPane.setVgap(30);

    message = new Text(object_message);
    gridPane.addColumn(0, message, ok);
    scene = new Scene(gridPane);
    stage.setScene(scene);
    stage.show();
}

Answer 1

如果您想自己执行此操作，只需使 Stage 模式化并使用 showAndWait 而不是 show 来阻止调用线程，直到 Stage 关闭:

public static int showMessageDialog(String title, String object_message){
    stage = new Stage();
    stage.setMinHeight(150);
    stage.setMinWidth(250);
    stage.setTitle(title);
    stage.initModality(Modality.APPLICATION_MODAL);

    IntegerProperty returnCode = new SimpleIntegerProperty(-1);

    ok = new Button("OK");
    ok.setOnAction(ev -> {returnCode.set(1); stage.close();});

    gridPane = new GridPane();
    gridPane.setAlignment(Pos.CENTER);
    gridPane.setVgap(30);

    message = new Text(object_message);
    gridPane.addColumn(0, message, ok);
    scene = new Scene(gridPane);
    stage.setScene(scene);
    stage.showAndWait();

    return returnCode.get();
}