首先:我已经尝试过:
fxml loader exception "root value is already specified" I never specified a root value
javafx exception : Controller value already specified
LoadException: Root value already specified on custom control
但是没有解决方案对我有用:我从FXML中删除了fx:controller
标签->异常,总是添加了fx:root type="BorderPane
相同的异常:
原因:java.lang.RuntimeException:javafx.fxml.LoadException:已指定根值
当我从自定义控制器中删除语句fxmlLoader.setRoot(this)
时,不会引发异常,但布局为空。为了更好地理解,以下是我的MainScreenController
中的代码段,我想在其中添加自定义控制器作为子级,并添加CustomController类ImageContainer
感谢您的帮助!
代码段MainScreenController(仅一个代码段):
public class MainScreenController{
public TextField tf_userName;
public ListView lv_listView;
public FlowPane fp_contentFlowPane;
public SplitPane sp_splitPane;
public void onItemClicked(MouseEvent mouseEvent) throws IOException {
int index = lv_listView.getSelectionModel().getSelectedIndex();
if (mouseEvent.getButton().equals(MouseButton.SECONDARY)) {
if (index >= 0) {
lv_listView.getItems().remove(index);
userList.remove(index);
}
}
else{
ImageContainer imgC = new ImageContainer(4,2,"location");
fp_contentFlowPane.getChildren().add(imgC);
}
}}
我的自定义控制器ImageContainer的代码:
public class ImageContainer extends Pane {
public HBox hbx_elementContainer;
public Label lb_likeCount;
public Label lb_commentCount;
public Label lb_location;
public Label lb_accountHolder;
public ImageView iv_feedImage;
private String imageLink;
public ImageContainer(int likeCount, int commentCount, String location) {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/image_container.fxml"));
fxmlLoader.setController(this);
fxmlLoader.setRoot(this);
try {
fxmlLoader.load();
} catch (IOException e) {
throw new RuntimeException(e);
}
this.lb_likeCount.setText(String.valueOf(likeCount));
this.lb_commentCount.setText(String.valueOf(commentCount));
this.lb_location.setText(location);
Image image = new Image("/sampleFoto.JPG");
iv_feedImage.setImage(image);
}
}
我要设置的布局的FXML文件:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.text.Font?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="200.0" prefWidth="200.0" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1">
<bottom>
<HBox fx:id="hbx_elementContainer" prefHeight="31.0" prefWidth="600.0" BorderPane.alignment="CENTER">
<children>
<Label fx:id="lb_likeCount" contentDisplay="TOP" text="Label">
<HBox.margin>
<Insets right="10.0" />
</HBox.margin></Label>
<Label fx:id="lb_commentCount" text="Label">
<HBox.margin>
<Insets right="20.0" />
</HBox.margin></Label>
<Label fx:id="lb_location" text="Label" />
<Label fx:id="lb_accountHolder" text="Label" />
<Button mnemonicParsing="false" text="Download">
<font>
<Font name="Arial Bold" size="11.0" />
</font>
<HBox.margin>
<Insets right="10.0" />
</HBox.margin>
</Button>
</children>
</HBox>
</bottom>
<center>
<AnchorPane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<children>
<ImageView fx:id="iv_feedImage" fitHeight="150.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
</children>
</AnchorPane>
</center>
</BorderPane>