JavaFX MediaPlayer - 舞台的大小

Question

我正在使用 JavaFX 8 中的 MultiMedia classes 编写自己的多媒体应用程序。当我运行（开始时）我的程序时，我想要我的宽度和高度Stage 与我要播放的媒体（视频）的宽度和高度相同。

mp.setOnReady(new Runnable() {
        @Override
        public void run() {
            Timeline slideIn = new Timeline();
            Timeline slideOut = new Timeline();

            stage.getScene().setOnMouseEntered(e -> {
                slideIn.play();
            });

            stage.getScene().setOnMouseExited(e -> {
                slideOut.play();
            });
            // here I get the width and heigth of the media
            int w = mp.getMedia().getWidth();
            int h = mp.getMedia().getHeight();
            // width is 1280 and heigth is 720 (both values are correct)
            if (w != 0 && h != 0) {
                //Here Im setting the width and the height of stage
                //But when I run my app, stage is a little bit smaller than
                //MediaView and I have to resize the stage manually by cca 20px to get the whole view
                stage.setWidth(w);
                stage.setHeight(h);
                stage.centerOnScreen();

                //On the other hand, animation works pretty well and
                //correctly with the "w" and "h"
                mediaBar.setMinSize(w - 100, 100);
                mediaBar.setTranslateY(h - 100);
                mediaBar.setTranslateX(50);
                mediaBar.setOpacity(0);

                slideIn.getKeyFrames().addAll(new KeyFrame(new Duration(0), new KeyValue(mediaBar.translateYProperty(), h), new KeyValue(mediaBar.opacityProperty(), 0.0)),
                        new KeyFrame(new Duration(300), new KeyValue(mediaBar.translateYProperty(), h - 100), new KeyValue(mediaBar.opacityProperty(), 0.9))
                );

                slideOut.getKeyFrames().addAll(new KeyFrame(new Duration(0), new KeyValue(mediaBar.translateYProperty(), h - 100), new KeyValue(mediaBar.opacityProperty(), 0.9)),
                        new KeyFrame(new Duration(300), new KeyValue(mediaBar.translateYProperty(), h), new KeyValue(mediaBar.opacityProperty(), 0.0))
                );

                background.setWidth(w - 100);
                background.setHeight(100);
                background.setTranslateY(h - 100);
                background.setTranslateX(50);
                background.setOpacity(0);

                slideIn.getKeyFrames().addAll(new KeyFrame(new Duration(0), new KeyValue(background.translateYProperty(), h), new KeyValue(background.opacityProperty(), 0.0)),
                        new KeyFrame(new Duration(300), new KeyValue(background.translateYProperty(), h - 100), new KeyValue(background.opacityProperty(), 1))
                );

                slideOut.getKeyFrames().addAll(new KeyFrame(new Duration(0), new KeyValue(background.translateYProperty(), h - 100), new KeyValue(background.opacityProperty(), 1)),
                        new KeyFrame(new Duration(300), new KeyValue(background.translateYProperty(), h), new KeyValue(background.opacityProperty(), 0.0))
                );
            } else {
                //music
            }
            duration = mp.getMedia().getDuration();
            updateValues();
        }
    });

所以我想 Stage class 有一些我还不知道的重要信息。

当我将 Stage 的 initStyle 设置为 StageStyle.UNDECORATED 时，我可以看到整个 MediaView。但是我不想有这种风格。

谁能帮我解决这个问题？我希望我正确描述了我的问题，因为这是我第一次寻求帮助。谢谢。

Answer 1

这是因为舞台的高度和宽度包括装饰。来自 javadoc of widthProperty:

This value includes any and all decorations which may be added by the Operating System such as resizable frame handles. Typical applications will set the Scene width instead.

如您所见，解决方案也在文档中：您可以改为设置 Scene 的大小。

此示例打开一个 Stage，其中嵌入了一个大小为 400x400 的 Scene。

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            BorderPane root = new BorderPane();
            Scene scene = new Scene(root,400,400);
            primaryStage.setTitle("Stage with 400x400 Scene");
            primaryStage.setScene(scene);

            primaryStage.setOnShown(event -> System.out.println("Size of the Stage is " + primaryStage.getHeight() + "x" + primaryStage.getWidth()));

            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

输出为

Size of the Stage is 438.0x416.0

如您所见，如果您设置 Scene 的大小，Stage 会因为装饰而显示得更大。

更新：刚刚发现我在这里有一个非常相似的答案：JavaFX: Set Scene min size excluding decorations

JavaFX MediaPlayer - 舞台的大小

JavaFX MediaPlayer - size of the Stage

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multimedia

javafx

stage