自定义对话框在第一次显示时闪烁

如何解决自定义对话框在第一次显示时闪烁

我创建了一个自定义 Dialog，但在第一次显示时它会闪烁。仅在添加自定义图形时才会发生。

视图控制器类：

public final class CustomDialog extends Dialog<Boolean> {

    @FXML
    private Label content_label;

    @FXML
    private Button ok_button;

    @FXML
    private ImageView graphic_imageview;

    private int type;

    static public int INFORMATION = 1;
    static public int WRANING = 2;

    private String getDesktopProperty;
    private String graphicPath;

    public CustomDialog (Window owner,String title,String content,int type) throws IOException {
        
        FXMLLoader loader = new FXMLLoader(getClass().getClassLoader().getResource("dialog.fxml"));
        loader.setController(this);

        DialogPane dialogPane = loader.load();

        initOwner(owner);
        initModality(Modality.APPLICATION_MODAL);
        
        setResizable(false);
        setWidth(600);
        setHeight(110);

        setTitle(title);
        updateContent(content);
        
        setDialogPane(dialogPane);
    }

    @FXML
    private void initialize() {
        getDialogPane().getScene().getWindow().setOnCloseRequest(event -> {
            closeDialog();
        });

        getDialogPane().getScene().getWindow().setOnShowing(event -> {
            ((Runnable) Toolkit.getDefaultToolkit().getDesktopProperty(getDesktopProperty)).run();
        });

        switch (type) {
            case 2:
                getDesktopProperty = "win.sound.excalmation";
                graphicPath = "img/custom_dialog_graphics/impostor.gif";
                break;
                
            default:
                getDesktopProperty = "win.sound.asterisk";
                graphicPath = "img/custom_dialog_graphics/jolly.gif";
                break;
        }

        try {
            updateGraphic(new Image(graphicPath));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @FXML
    private void ok_button_action (ActionEvent event) {
        closeDialog();
    }

    public void updateTitle (String title) {
        setTitle(title);
    }

    public void updateContent (String content) {
        content_label.setText(content);
    }
    
    public void updateGraphic (Image image) {
        graphic_imageview.setImage(image);
    }
    
    public void updateType (Image image) {
        graphic_imageview.setImage(image);
    }

    private void closeDialog () {
        setResult(Boolean.TRUE);
        close();
    } 

}

FXML：

<DialogPane maxHeight="110.0" maxWidth="370.0" minHeight="110.0" minWidth="370.0" prefHeight="110.0" prefWidth="370.0" xmlns="http://javafx.com/javafx/16" xmlns:fx="http://javafx.com/fxml/1">
   <graphic>
      <AnchorPane prefHeight="110.0" prefWidth="100.0">
         <children>
            <ImageView fx:id="graphic_imageview" fitHeight="80.0" fitWidth="80.0" layoutX="-27.0" layoutY="-20.0" pickOnBounds="true" preserveRatio="true" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="5.0" AnchorPane.rightAnchor="5.0" AnchorPane.topAnchor="5.0">
               <image>
                  <Image url="@img/jolly.gif" />
               </image>
            </ImageView>
         </children>
         <opaqueInsets>
            <Insets />
         </opaqueInsets>
      </AnchorPane>
   </graphic>
   <content>
      <AnchorPane prefHeight="200.0" prefWidth="200.0">
         <children>
            <GridPane layoutX="-3.0" layoutY="-2.0" prefHeight="92.0" prefWidth="263.0" AnchorPane.bottomAnchor="-20.0" AnchorPane.leftAnchor="-10.0" AnchorPane.rightAnchor="-10.0" AnchorPane.topAnchor="0.0">
              <columnConstraints>
                <ColumnConstraints hgrow="SOMETIMES" maxWidth="189.0" minWidth="10.0" prefWidth="129.0" />
                  <ColumnConstraints hgrow="SOMETIMES" maxWidth="123.0" minWidth="10.0" prefWidth="121.0" />
                <ColumnConstraints hgrow="NEVER" maxWidth="10.0" minWidth="10.0" prefWidth="10.0" />
              </columnConstraints>
              <rowConstraints>
                <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
              </rowConstraints>
               <children>
                  <Button fx:id="ok_button" maxHeight="25.0" maxWidth="75.0" minHeight="25.0" minWidth="75.0" mnemonicParsing="false" onAction="#ok_button_action" prefHeight="25.0" prefWidth="75.0" text="OK" GridPane.columnIndex="1" GridPane.halignment="RIGHT" GridPane.rowIndex="2" GridPane.valignment="BOTTOM" />
                  <Label fx:id="content_label" alignment="TOP_LEFT" prefHeight="52.0" prefWidth="250.0" text="Lorem ipsum dolor" wrapText="true" GridPane.columnSpan="2" GridPane.rowSpan="2" />
               </children>
            </GridPane>
         </children>
      </AnchorPane>
   </content>
</DialogPane>