I implemented my own control using the fxml file and the Java class, similar to what is described in this official tutorial (see below). Note that the root element of fxml is defined using fx:root, and I call setRootprogrammatically.
I tried to include controls in the layout of the FXML application, and the application loaded normally (and displays the control as expected).
However, if I try to import a jar file containing my control in Scene Builder 2.0, the control does not appear in the list of components to import (unlike some other controls in the same bank). If I select Show JAR Analysis Report, it will display the error caused by javafx.fxml.LoadException: Root value already specified.
Do you know why I get this error when loading into Scene Builder, even if it loads correctly in a real application?
Here is FXML:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.Font?>
<fx:root type="javafx.scene.layout.GridPane" id="MediaMetadataDisplay" hgap="20.0" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="200.0"
prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<columnConstraints>
<ColumnConstraints fillWidth="false" hgrow="NEVER" maxWidth="-Infinity" minWidth="-Infinity" prefWidth="200.0"/>
<ColumnConstraints halignment="LEFT" hgrow="ALWAYS"/>
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="30.0" vgrow="SOMETIMES"/>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="40.0" vgrow="SOMETIMES"/>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="25.0" vgrow="SOMETIMES"/>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="25.0" vgrow="SOMETIMES"/>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="25.0" vgrow="SOMETIMES"/>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="25.0" vgrow="SOMETIMES"/>
<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="30.0" vgrow="SOMETIMES"/>
</rowConstraints>
<children>
<ImageView id="coverView" fx:id="coverView" fitHeight="200.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true" GridPane.rowSpan="7"/>
<Label id="trackName" fx:id="trackName" maxWidth="1.7976931348623157E308" text="trackName" GridPane.columnIndex="1" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="16.0"/>
</font>
</Label>
<Label id="artist" fx:id="artist" maxWidth="1.7976931348623157E308" text="artist" GridPane.columnIndex="1" GridPane.rowIndex="2"/>
<Label id="album" fx:id="album" maxWidth="1.7976931348623157E308" text="album" GridPane.columnIndex="1" GridPane.rowIndex="3"/>
<Label id="genre" fx:id="genre" maxWidth="1.7976931348623157E308" text="genre" GridPane.columnIndex="1" GridPane.rowIndex="4"/>
<Label id="trackNumber" fx:id="trackNumber" maxWidth="1.7976931348623157E308" text="trackNumber" GridPane.columnIndex="1" GridPane.rowIndex="5"/>
</children>
</fx:root>
And the Java / root control:
package customjavafx.scene.control;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.GridPane;
import javafx.scene.media.Media;
import java.io.IOException;
import java.util.Map;
public class MediaMetadataDisplay extends GridPane {
public MediaMetadataDisplay() {
final FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("MediaMetadataDisplay.fxml"));
fxmlLoader.setRoot(this);
fxmlLoader.setController(this);
try {
fxmlLoader.load();
} catch (IOException exception) {
throw new RuntimeException(exception);
}
media.addListener((obs, oldVal, newVal) -> updateMedia(newVal));
}
private final ObjectProperty<Media> media = new SimpleObjectProperty<>((Media) null, "media");
@FXML private ImageView coverView;
@FXML private Label trackName;
@FXML private Label artist;
@FXML private Label album;
@FXML private Label genre;
@FXML private Label trackNumber;
public void updateMedia(Media media) {
}
public ObjectProperty<Media> mediaProperty() {
return media;
}
public Media getMedia() {
return mediaProperty().get();
}
public void setMedia(final Media media) {
mediaProperty().set(media);
}
}
The cause of the stack error shown by Scene Builder:
Caused by: javafx.fxml.LoadException: Root value already specified.
file:/Users/guillaumegaly/Library/Application%20Support/Scene%20Builder/Library/custom-controls_2.11.jar!/customjavafx/scene/control/MediaMetadataDisplay.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2613)
at javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2771)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2720)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at customjavafx.scene.control.MediaMetadataDisplay.<init>(MediaMetadataDisplay.java:26)
... 18 more
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