Implementing CSS to Style Images in JavaFX FXML

After creating the FXML structure below, I attempted to define a border in CSS for the Image by using code in the customerform.css file:

<VBox id="customerFormPane" styleClass="customerForm" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.customer.CustomerFormController" >
    <stylesheets>
        <URL value="@customerform.css"/>
    </stylesheets>

    <GridPane>
        <columnConstraints>
            <ColumnConstraints hgrow="ALWAYS" percentWidth="50.0"/>
            <ColumnConstraints hgrow="ALWAYS" percentWidth="50.0"/>
        </columnConstraints>

        <ImageView id="boxImage" fitWidth="100" fitHeight="100">
            <image>
                <Image url="@/com/exmaple/resources/icons/office.png" />
            </image>            
        </ImageView>
    </GridPane>

</VBox>

.customerForm Image, .customerForm ImageView, .customerForm image {

    -fx-background-color: white;
    -fx-border-style: solid;
    -fx-border-color: red;

}

Despite having the image displayed correctly, my attempts did not render any visible border on the ImageView. Does anyone have any suggestions on how to successfully select and style the ImageView element?

javacssjavafxfxml

Answer №1

If a node does not support certain CSS properties, they will be ignored. This is the case with properties like -fx-background-color, -fx-border-style, and -fx-border-color when used with the ImageView class, which is not a subclass of Region.

To make it work, you'll need to wrap the image in a suitable type of Region.

Here's an example:

<GridPane>
    <columnConstraints>
        <ColumnConstraints hgrow="ALWAYS" percentWidth="50.0"/>
        <ColumnConstraints hgrow="ALWAYS" percentWidth="50.0"/>
    </columnConstraints>
    <!-- container using pref size as max size to not grow larger than the image -->
    <Pane styleClass="image-container" maxWidth="-Infinity" maxHeight="-Infinity">
        <children>
            <ImageView id="boxImage" fitWidth="100" fitHeight="100">
                <image>
                    <Image url="@/com/exmaple/resources/icons/office.png" />
                </image>            
            </ImageView>
       </children>
    </Pane>
</GridPane>

.image-container {
    -fx-background-color: white;
    -fx-border-style: solid;
    -fx-border-color: red;
}

By the way, if you're unsure about the correct selectors to use, remember to include the node type in the selector. Using .customerForm ImageView or #boxImage should work as selectors.

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