How can I programatically set a background image using JavaFX?

I need to create a highly customizable control that allows users to use an image as the background. In order to achieve this, I am trying to figure out how to set the CSS Style in code to specify the user's chosen image.

Here is my current attempt (which resulted in a warning about "unknown protocol: c" that I don't understand):

BG = //The CSS String
    "-fx-background-position : 50% 50%;\n" +
    "-fx-background-repeat : no-repeat;\n" +
    "-fx-background-size : contain;\n" +
    "-fx-background-image : url(\"" + GS.bgImage.getAbsolutePath() + "\");\n";

BG += "-fx-border-width : " + GS.borderWidth + ";\n" //For adding the Border
    + "-fx-border-color : " + GS.borderColor.toString();

this.setStyle(BG);

The GS class I created provides the information for the control's appearance. The GS.bgImage represents the desired background image for the control. Am I making a mistake by using .getAbsolutePath()? Or could it be something else?

javacssjavafx

Answer №1

After some trial and error, I discovered that using File.getPath() or File.getAbsolutePath() was causing the problem. The key to making it work in the code is actually utilizing File.toURI().toURL().

Here is the correct approach:

BG = //The CSS String, remember to include a Try/Catch block for MalformedURLException handling
    "-fx-background-position : 50% 50%;\n" +
    "-fx-background-repeat : no-repeat;\n" +
    "-fx-background-size : contain;\n" +
    "-fx-background-image : url(\"" + GS.bgImage.toURI().toURL + "\");\n";

BG += "-fx-border-width : " + GS.borderWidth + ";\n" //To add Border
    + "-fx-border-color : " + GS.borderColor.toString();

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