how to make transparent scene and stage in javafx?

问题:

I want to have transparent progressindicator, which is indefinite.

here is the code, it shows grey background state/scene. i wanted fully transparent.

I tried following code, but it shows background stage which is not transparent.

package application;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

    public class Main extends Application {

        @Override
        public void start(Stage stage) {
            /*
             * 
             * my css file content:
             * 
             * .progress-indicator .indicator { -fx-background-color: transparent;
             * -fx-background-insets: 0; -fx-background-radius: 0;
             * 
             * } .progress-indicator { -fx-progress-color: green ; }
             * 
             * 
             * 
             */
            Stage initStage = new Stage();

            initStage.initStyle(StageStyle.TRANSPARENT);
            ProgressIndicator loadProgress = new ProgressIndicator();
            loadProgress.setSkin(null);
            loadProgress.setPrefWidth(50);
            VBox box = new VBox();
            box.getChildren().add(loadProgress);
            final Scene scene = new Scene(box, 150, 150);

            scene.setFill(Color.TRANSPARENT);

            initStage.setScene(scene);
            scene.getStylesheets().add("application.css");

            initStage.show();

        }

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

    }

回答1:

For modena.css (the default JavaFX look and feel definition in Java 8), a slight shaded background was introduced for all controls (and also to panes if a control is loaded).

You can remove this by specifying that the default background is transparent. This can be done by adding the following line to your application's CSS file:

.root { -fx-background-color: transparent; }

This is in addition to other settings you already have in your code to initialize the style of the stage and background fill of the scene.

stage.initStyle(StageStyle.TRANSPARENT);
scene.setFill(Color.TRANSPARENT);

Note: in the questions's sample code, an additional stage (initStage) is created instead of using the passed in stage for the start method. The passed in stage can be initialized, utilized and shown directly by your code rather than creating an additional initStage.

回答2:

stage.initStyle(StageStyle.TRANSPARENT);
this is for hide the top bar ( minimize, Restore Down and close)

scene.setFill(Color.TRANSPARENT);
this is for the frame color ( you can replace TRANSPARENT with any color GREEN YELLOW RED BLUE ...)
but for me I want glass view if you can understand me,
and with different color
so the solution is

 primaryStage.setOpacity(0.2);

the number 0.2 is between 0 and 1
0 is hidden and 1 is normal form but between the numbers transparent
so choose your number and run your program and see if this is what you want
there is this code for full screen

 primaryStage.setFullScreen(true);<br>

and in the css file do this

.root { -fx-background-color:rgba(0,0,0,1); }<br>

and you can change the color with changed the number in rgba(0,0,0,1)