I'm trying to create a javafx application (in scenebuilder).
How to get transparent stage, with solid items (buttons etc) on it? As it is done in Windows 10 calculator. The buttons are solid but the rest of the pane is transparent.
Thanks in advance.
To do that, first, you need to put the scene in a transparent Stage :
myStage.initStyle(StageStyle.TRANSPARENT);
Be aware: if you do this, you need to use your own exit button, minimize buttons, because the titlebar will be gone.
Then, change the alpha channel of your scene to your desired, say 0.5:
scene.setFill(Color.rgb(0,26,0,0.5));
and finally, the root node's Background needs to be empty:
root.setBackground(Background.EMPTY);
You are done. Now you can change the translucency of your application through the alpha variable.
Related
I'd like to create a simple protactor in javafx. To that aim, I need to create a stage with a transparent backgrount but WITH decorations. I mean : I still want to be able to move my window or close it when finished.
I tried to use those properties :
stage.initStyle(StageStyle.TRANSPARENT);
But all the window disappear : the background AND the decoration.
I also tried to use :
stage.setOpacity(0.9);
In that case, all the window, background and decoration is partially translucent and that's not what I want to get.
I would like a stage with a full opaque decoration and a fully transparent background on which I'll can draw a protractor partially opaque, like if I was using the real object on my screen.
Does someone could give me a tip to do that ?
Thank you for your help.
I had a hard time figuring out why my transparent stage refuses to be transparent. Finally I found out, that it was caused by a Tooltip that was installed into an ImageView:
ImageView imageViewIcon = new ImageView();
imageViewIcon.setFitWidth(70);
imageViewIcon.setFitHeight(70);
imageViewIcon.setPreserveRatio(false);
imageViewIcon.setImage(new Image("./next.png"));
Tooltip tooltip = new Tooltip("Tooltip!");
if (this.config.getShowTooltip("true")) {
Tooltip.install(imageViewIcon, tooltip);
}
When I comment out the last 4 lines, the transparency works as expected, but with the Tooltip installed the stages background is grayish (e.g. the default window background). Though it's obvious what the button does and the tooltip is not essential for my layout it'd be nice to have, just to give a little hint...
Any suggestions or workarounds?
Solution
Set the style -fx-background-color: transparent on the root node of the scene.
Background
Similar behavior is discussed in an Oracle JavaFX Forum post on the JavaFX Scene/Fill Color.
Relevant comments from the thread by David Grieve, the lead developer for the JavaFX CSS features:
This happens because modena.css sets the background color of the root node. Setting the style -fx-background-color: transparent on the root node of the scene is the solution.
BorderPane root = new BorderPane();
root.setStyle("-fx-background-color: transparent;");
Scene scene = new Scene(root, 600, 400, Color.BLACK);
The default user agent stylesheet is loaded the first time a Control is instantiated. The reason for this is to avoid loading stylesheets and reduce CSS overhead in scene-graphs that contain nodes that don't use CSS.
The history behind it is that the designer of the modena theme felt that the controls looked better on this particular background color, which is a very light grey. Unfortunately, the Scene's background fill cannot be styled from CSS, so the style was set on the root node of the scene. There is an issue logged in JIRA to make Scene so that it can be styled by CSS (RT-31282)
The merit of loading in this way is to avoid css overhead in scene's that don't use controls. This would be typical of a splash screen, for example. Or maybe a game. This design choice was made a long time ago when CSS performance was a big issue, but it still makes sense for embedded devices.
In the case of your question, Tooltip is a control, so when you add it to the scene it implicitly triggers the default modena.css stylesheet to be loaded for the scene (which sets the background of the root node of the scene to gray rather than a null or transparent fill which is used when there are no controls in the scene). To retain the transparent background for the application when a control is used in the scene, it is necessary to explicitly set the scene root node background to transparent.
Sample code for a transparent stage:
//this is where the transparency is achieved:
//the three layers must be made transparent
//(i) make the VBox transparent (the 4th parameter is the alpha)
root.setStyle("-fx-background-color: rgba(0, 0, 0, 0);");
//(ii) set the scene fill to transparent
scene.setFill(null);
//(iii) set the stage background to transparent
stage.initStyle(TRANSPARENT);
Related question: Nodes - Choose the Layer to appear JavaFX2
I'm using JavaFx 8 with SceneBuilder 2. I have a number of panes as children of a StackPane and I would like to make only the front Node visible. I need to do this without disabling visibility of the other children, and I've tried to do this using the opacity setting seen below (ignore the fact that visibility is disabled):
Without disabling the visiblity of the other child nodes, the children are always drawn over each other, even when using different blend modes (SRC_OVER & SRC_ATOP), as seen below:
The reason I would like to avoid setting visibility to false of the child elements is that I want to animate a transition between the panes, in which one pane needs to be draw over the top of the other.
I must be missing something obvious here, but I can't see what it is?
The answer is to set the background colour of the panes. Opacity has no effect without first setting a background colour.
You could try setting the visibility to false.
To do that, call setVisible(false) on the node you'd like to render invisible in the StackPane.
See Node::setVisible
I am trying to develop an app using JavaFX 8 and I'm stuck with a resizing problem. The Selected File and Password fields in the below figure doesn't realign as I wish it to be in the AnchorPane..i.e. to be in the center with exact distances from the top navigation bar and the footer. I have tried AnchorPane Constraints in Scene Builder. I was unable to get a perfect match.
Hoping to get an alternate approach or a small overview of AnchorPane constraints.
Note: I'm new to JavaFX graphics library.
Below enclosed are the images and the FXML file that I'm working on.
What I want is this kind of alignment in full screen mode too.
This is the actuality when I switch to full screen.
For a quick fix, try wrapping your AnchorPane in a simple layout, such as an HBox, and set the alignment of the HBox to Pos.CENTER.
However, AnchorPane is probably not the best layout pane to use here. You should read through the layout tutorial and figure out a different strategy: probably you want a BorderPane as the overall structure with HBoxs and/or GridPanes inside.
I was wondering if it would be possible to create a window using SWT that has either a transparent background or no background (i.e., just buttons and texts are shown floating).
I've tried using the setBackground() function like:
shell.setBackground(display.getSystemColor(SWT.TRANSPARENT));
but it will just show a window with a black background rather than a transparent one. any way to do this?
See How to Create Translucent and Shaped Windows (Java 7+).
..(SWT) uses the native window scheme, rather than an ugly/custom one. ..
Use Swing with the native PLAF.
Update 1
Me.
..you want component (button etc.), not Window (or ancestor) transparency?
To which you replied.
not necessarily the component itself, but the 'area' in which the component resides in. if you look at the Nested Layout Example above, you see the win 7's transparent border, then you see the normal gray background. I'd like that gray background to also be transparent.
You can create a window with per-pixel translucency, where each pixel has its own alpha value. With this feature you can, for example, create a window that fades away to nothing by defining a gradient in the alpha values.
And as an aside, that 3rd screenshot is actually the 2nd image ripped directly from the page that is linked in the 1st sentence of my reply (the same page where I got the above quote). Did you follow the link, read the page (look at the screenshots), try the working examples?