第二个表单上的对象是null JavaFX

时间：2014-09-30 23:38:31

标签： java nullpointerexception javafx

即使我将第二个FXML表单加载到GUI中，我也无法弄清楚为什么变量为null。第二个fxml表单包含一个TabPane， theImageDisplayer ，以及两个ImageViews， editedImage 和 orignialImage 。第二个FXML中的所有变量都没有初始化，它阻止我的GUI执行某些操作，例如“从计算机导入图像。”

这是我的代码：

private void initializeRootLayout() {
    Scene scene = new Scene(this.rootLayout);
    this.primaryStage.setScene(scene);
    this.primaryStage.setResizable(false);
    this.primaryStage.sizeToScene();
    this.initializeImageView(); <-- Initializes the Tab Layout
    -->this.initializePictureController();<--  Initializes my controller PictureController
    this.primaryStage.show();
}

private void initializeImageView() {
        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(getClass().getResource("/edu/westga/SignboardProjectXXX/view/PictureView.fxml"));
        this.tabs = (TabPane) loader.load();<-- Initializes the TabLayout with the null variables

        this.rootLayout.setCenter(this.tabs); <-- Adds the Tab Layout to the root layout

这是我的控制器PictureContoller崩溃的地方：

public class PictureController {

@FXML
---->private TabPane theImageDisplayer;<---- The variable is located here.

@FXML
private ListView<Picture> imageHistoryList;

//Textfields:
@FXML
private TextField imageDimensions;

@FXML
private TextField imageLinkBox;

@FXML
private TextField imageName;

// Labels:
@FXML
private Label pixelsPerHeight;

@FXML
private Label resizePercentage;

@FXML
private Label zoomEditedImagePercentage;

@FXML
private Label pixelsPerLength;

@FXML
private Label pixelsPerWidth;

// Check-box Button:
@FXML
private CheckBox replaceOriginalImage;

@FXML
private CheckBox eraseHistoryOnImageChange;

// Sliders:
@FXML
private Slider imageResizeSlider;

@FXML
private Slider zoomEditedImageSlider;

@FXML
private Slider pixelsPerHeightSlider;

@FXML
private Slider pixelsPerWidthSlider;

// Accordion Menu:
@FXML
private Accordion theMainMenu;

// Toggle Buttons:
@FXML
private ToggleGroup fileType;

@FXML
private ToggleButton toggleEditedImageVisibility;

// Buttons:
@FXML
private Button restoreImageButton;

@FXML
private Button downloadImageButton;

@FXML
private Button uploadImageButton;

// Radio Buttons:
@FXML
private RadioButton pngRadioButton;

@FXML
private RadioButton gifRadioButton;

@FXML
private RadioButton jpegRadioButton;

@FXML
private RadioButton jpgRadioButton;

// Image Displays:
@FXML
private ImageView originalImage;

@FXML
private ImageView historyPreviewImage;

@FXML
private ImageView editedImage;

// Instance Variables:
private UploadDownloadController loadSaveController;
private ImageFilterController filterController;
private ObservableList<Picture> imageHistory;
private String imageSaveExtension;
private Picture originalPic;
private Picture currEditedPic;
private PictureIO io;
private ArrayList<RadioButton> saveTypesExtension;

private static final int ORIGINAL_IMAGE_TAB = 0;
private static final int EDITED_IMAGE_TAB = 1;

public void initialize() {
    this.io = new PictureIO();
    this.loadSaveController = new UploadDownloadController();
    this.originalPic = new Picture("Default", 100, 100);
    this.currEditedPic = new Picture("Default", 100, 100);
    this.saveTypesExtension = this.buildTemporarySaveTypeList();
}

@FXML
private void toggleSelection(MouseEvent event) {
    System.out.println("hello6");
}

@FXML
private void changeRadioButtonSetValue(ActionEvent event) {
    this.setImageSaveExtentionValue();
}

@FXML
private void changePixelWidthPerSquare(MouseEvent event) {
    this.setValueOfLabel(this.pixelsPerWidthSlider, this.pixelsPerWidth);
}

@FXML
private void changePixelHeightPerSquare(MouseEvent event) {
    this.setValueOfLabel(this.pixelsPerHeightSlider, this.pixelsPerHeight);
}

@FXML
private void changeImageSize(MouseEvent event) {
    this.setValueOfLabel(this.imageResizeSlider, this.resizePercentage);
}

@FXML
private void changeEditedZoomLevel(MouseEvent event) {
    this.setValueOfLabel(this.zoomEditedImageSlider, this.zoomEditedImagePercentage);
}

@FXML
private void toggleEditedImageVisibility(ActionEvent event) {
    this.toggleVisibility(this.editedImage);
}

@FXML
private void uploadImageFromComputer(ActionEvent event) {
    this.loadFromComputer();
    this.selectTab(EDITED_IMAGE_TAB);
}

@FXML
private void downloadImageFromWeb(ActionEvent event) {
    this.getImageFromWeb();
    this.selectTab(EDITED_IMAGE_TAB);

    System.out
            .println("Warn users a better way. This does not go away after a few seconds.");
}

private void selectTab(final int theTab) {
    SingleSelectionModel<Tab> sinlgeSelection = this.theImageDisplayer.getSelectionModel();
    sinlgeSelection.select(theTab);
}

@FXML
private void displayImageInformation(MouseEvent event) {
    this.getInformationFromPicture();
}

@FXML
private void restoreSelectedImage(ActionEvent event) {
    this.revertImageWithPrevImage();
}

@FXML
private void resizeImage(ActionEvent event) {
    double realPercentageValue = this.io.changeStringToNumber(this.resizePercentage.getText()) / 100.0;
    System.out.println("Result: " + realPercentageValue);
    this.filterController = new ImageFilterController(this.currEditedPic);
    Picture picture = this.filterController.resizedPicture(realPercentageValue);
    this.changeEditedImage(picture);
    this.io.convertPictureToImage(picture);
}

// private void warnUser() {
// Tooltip warningToUser = new
// Tooltip("Please enter value in the text area above.");
// Tooltip.install(this.downloadImageButton, warningToUser);
// warningToUser.show(this.downloadImageButton, 0, 0);
// //TODO make tooltip work
// }

private void setImageSaveExtentionValue() {
    for (RadioButton selectedRadioButton : this.saveTypesExtension) {
        if (selectedRadioButton.isSelected()) {
            this.imageSaveExtension = selectedRadioButton.getText();
        }
    }
}

private ArrayList<RadioButton> buildTemporarySaveTypeList() {
    ArrayList<RadioButton> imagesaveTypes = new ArrayList<RadioButton>();
    imagesaveTypes.add(this.gifRadioButton);
    imagesaveTypes.add(this.pngRadioButton);
    imagesaveTypes.add(this.jpgRadioButton);
    imagesaveTypes.add(this.jpegRadioButton);
    return imagesaveTypes;
}

private void setValueOfLabel(Slider theSlider, Label theLabel) {
    theSlider.valueChangingProperty().addListener(
            new ChangeListener<Boolean>() {
                @Override
                public void changed(
                        ObservableValue<? extends Boolean> observableValue,
                        Boolean wasChanging, Boolean changing) {
                    if (wasChanging || changing) {
                        theLabel.setText((int) theSlider.getValue() + "");
                    }
                }
            });
}

private void toggleVisibility(Node targetObject) {
    boolean currVisibility = targetObject.isVisible();
    targetObject.setVisible(!currVisibility);
}

private void revertImageWithPrevImage() {
    try {
        Picture prevPicture = this.io.convertImageToPicture(this.editedImage);
        this.imageHistory.add(prevPicture);
        Picture restoredPicture = this.imageHistoryList.getSelectionModel()
                .getSelectedItem();
        this.currEditedPic = new Picture(restoredPicture.getName(), restoredPicture.getImage());
        Image theImage = this.io.convertPictureToImage(restoredPicture);
        this.editedImage.setImage(theImage);
    } catch (Exception nullImage) {
        nullImage.getMessage();
    }
}

private void refreshHistoryList(Picture picture) {
    this.imageHistory = this.imageHistoryList.getItems();
    this.imageHistory.add(picture);
    this.imageHistoryList.setItems(this.imageHistory);
}

private void getInformationFromPicture() {
    Picture picture = this.imageHistoryList.getSelectionModel()
            .getSelectedItem();
    if (picture != null) {
        this.imageName.setText(picture.getName());
        this.imageDimensions.setText(picture.getWidth() + " x "
                + picture.getHeight());
        Image theImage = this.io.convertPictureToImage(picture);
        this.historyPreviewImage.setImage(theImage);
    }

}

private void loadFromComputer() {
    Picture picture = this.loadSaveController.uploadImage();
    this.changeAndStoreImage(picture);
}

private void getImageFromWeb() {
    String imageWebLink = this.imageLinkBox.getText();
    if (!imageWebLink.equals("")) {
        Picture picture = this.loadSaveController
                .downloadImage(this.imageLinkBox.getText());
        this.changeAndStoreImage(picture);
        this.imageLinkBox.clear();
    }
}

private void changeAndStoreImage(Picture picture) {
    if (!picture.getName().equals("No Image")) {
        this.changeEditedImage(picture);
        this.setOriginalImage(picture);
        this.refreshHistoryList(picture);
    }
}

private void changeEditedImage(Picture picture) {
    this.currEditedPic = new Picture(picture.getName(), picture.getImage());
    ------>this.theImageDisplayer.getTabs().get(1).setDisable(false);<------ It crashes here*
    Image theImage = this.io.convertPictureToImage(picture);
    this.editedImage.setImage(theImage);
    this.adjustImageSize(this.editedImage);
}

private void setOriginalImage(Picture picture) {
    this.originalPic = new Picture(picture.getName(), picture.getImage());
    Image theImage = this.io.convertPictureToImage(picture);
    this.originalImage.setImage(theImage);
    this.adjustImageSize(this.originalImage);
}

private void adjustImageSize(ImageView image) {
    this.adjustWidth(image);
    this.adjustHeight(image);
}

private void adjustHeight(ImageView image) {
    double imageDisplayHeight = this.theImageDisplayer.getHeight();
    double theImageHeight = image.getImage().getHeight();
    if (imageDisplayHeight < theImageHeight) {
        image.setFitWidth(imageDisplayHeight);
    }
}

private void adjustWidth(ImageView image) {
    double theImageWidth = image.getImage().getWidth();
    double imageDisplayWidth = this.theImageDisplayer.getWidth();
    if (imageDisplayWidth < theImageWidth) {
        image.setFitWidth(imageDisplayWidth);
    }
}

}

这是第二个FXML：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.effect.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.Region?>


<TabPane fx:id="theImageDisplayer" prefHeight="643.0" prefWidth="614.0" tabClosingPolicy="UNAVAILABLE" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="edu.westga.SignboardProjectMichaelMorguarge.view.PictureController">
  <tabs>
    <Tab text="Original Image">
      <content>
            <Pane prefHeight="614.0" prefWidth="607.0">
               <children>
                  <ScrollPane prefHeight="614.0" prefViewportHeight="180.0" prefViewportWidth="200.0" prefWidth="607.0">
                     <content>
                    <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="612.0" prefWidth="605.0">
                           <children>
                              <ImageView fx:id="originalImage" fitHeight="588.0" fitWidth="477.0" layoutX="64.0" layoutY="271.0" pickOnBounds="true" preserveRatio="true" AnchorPane.bottomAnchor="271.00199127197266" AnchorPane.leftAnchor="64.0" AnchorPane.rightAnchor="64.0" AnchorPane.topAnchor="271.0">
                                 <effect>
                                    <DropShadow />
                                 </effect>
                                 <image>
                                    <Image url="@../../../../../Welcome.png" />
                                 </image>
                              </ImageView>
                           </children>
                        </AnchorPane>
                     </content>
                  </ScrollPane>
               </children>
            </Pane>
      </content>
    </Tab>
    <Tab disable="true" text="Signboard">
      <content>
            <Pane>
               <children>
                  <ScrollPane prefHeight="614.0" prefViewportHeight="180.0" prefViewportWidth="200.0" prefWidth="607.0">
                     <content>
                        <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="612.0" prefWidth="605.0">
                           <children>
                              <ImageView fx:id="editedImage" fitHeight="588.0" fitWidth="477.0" layoutX="64.0" layoutY="12.0" pickOnBounds="true" preserveRatio="true" AnchorPane.bottomAnchor="12.0" AnchorPane.leftAnchor="64.0" AnchorPane.rightAnchor="64.0" AnchorPane.topAnchor="12.0">
                                 <effect>
                                    <DropShadow />
                                 </effect>
                              </ImageView>
                           </children>
                        </AnchorPane>
                     </content>
                  </ScrollPane>
               </children>
            </Pane>
      </content>
    </Tab>
  </tabs>
</TabPane>

如果您想了解更多信息，请对我大喊......我会关注此事并接受建议。

0 个答案:

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