javafx transparent window background with decorations

Question

I'm having a hard time figuring out how to make a transparent background for an application window in javafx. scene.setFill(null) seems to only work with stage.initStyle(StageStyle.TRANSPARENT). Doc for setFill says

Both a null value meaning paint no background and a Paint with transparency are supported, but what is painted behind it will depend on the platform.

but that doesn't make sense to me. It works (on windows 8) only with StageStyle.TRANSPARENT which removes the exit button and such which I still want.

I've looked at http://www.adam-bien.com/roller/abien/entry/completely_transparent_windows_stage_in and a few questions here.

Can this be done on windows?

possible duplicate of [JavaFX entirely customized windows?](http://stackoverflow.com/questions/12874664/javafx-entirely-customized-windows) — jewelsea, May 10 '14 at 16:49
@jewelsea so basically without hacking it out its not possible? — Old Badman Grey, May 13 '14 at 00:24
Related to: [how to make transparent scene and stage in javafx?](http://stackoverflow.com/questions/34033119/how-to-make-transparent-scene-and-stage-in-javafx) — jewelsea, Dec 02 '15 at 01:20

score 0 · Answer 1 · answered Aug 23 '14 at 03:28

I've been tinkering with similar settings, and this works for me:

  @Override
   public void start(Stage primaryStage) throws Exception{
      Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));

      primaryStage.setTitle("Hello World");
      primaryStage.initStyle(StageStyle.TRANSPARENT);
      primaryStage.setOpacity(0.5);
      primaryStage.setFullScreen(true);
      Scene scene = new Scene(root, 300, 275);
      primaryStage.setScene(scene);
      scene.getStylesheets().add(Main.class.getResource("main.css")
            .toExternalForm());
      primaryStage.show();
}

...and the css

.root {
    -fx-background-color: rgba(0,0,0,0.5); 
}

He doesn't want a `TRANSPARENT` window, though. That's the problem — RecursiveExceptionException, Dec 02 '16 at 18:20

score 0 · Answer 2 · answered Apr 18 '18 at 11:01

You can use this library. It is a fully customizable JavaFx Stage (CustomStage). You can see in-detail description of how to use it in this CustomStage Wiki

It has,

Window resizing
Default action buttons and their behaviour (close, maximize/restore, minimize)
Window dragging
Window is automatically scaled as for screen resolution
Very responsive
Stylable
Can achieve transparency
Has in-built navigation panes and drawers
etc.

javafx transparent window background with decorations

2 Answers2

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