JavaFX 8如何设置程序图标以发出警报?

问题描述

如何在不使用alert.initOwner()的情况下将程序图标设置为警报?为什么没有initOwner?这是因为在初始化整个窗口之前必须显示一些警报，因此我无法将任何场景放置到initOwner函数中.

How can I set program icon to alert without using alert.initOwner()?Why without initOwner? It's because some alert must be shown before whole window is initialized, so there's no scene that I can put to initOwner function.

推荐答案

您可以窃取 DialogPane ，并将其添加到常规Stage中.一个节点一次只能是一个场景的根，因此您需要先替换警报场景的根:

You can steal the DialogPane from an Alert instance, and add it to a regular Stage. A Node can only be the root of one Scene at a time, so you need to replace the root of the Alert’s Scene first:

public class AlertWithIcon
extends Application {
    @Override
    public void start(Stage stage) {
        Alert alert = new Alert(Alert.AlertType.CONFIRMATION,
            "Are you sure you want to delete this item?",
            ButtonType.YES, ButtonType.NO);
        alert.setHeaderText("Delete Item");

        DialogPane pane = alert.getDialogPane();

        ObjectProperty<ButtonType> result = new SimpleObjectProperty<>();
        for (ButtonType type : pane.getButtonTypes()) {
            ButtonType resultValue = type;
            ((Button) pane.lookupButton(type)).setOnAction(e -> {
                result.set(resultValue);
                pane.getScene().getWindow().hide();
            });
        }

        pane.getScene().setRoot(new Label());
        Scene scene = new Scene(pane);

        Stage dialog = new Stage();
        dialog.setScene(scene);
        dialog.setTitle("Delete Item");
        dialog.getIcons().add(new Image("GenericApp.png"));

        result.set(null);
        dialog.showAndWait();

        System.out.println("Result is " + result);
    }
}

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