4.5.2. Loading and Displaying Images

Let’s consider a task of loading, storing and displaying employee photos:

  • An employee is represented by Employee entity.

  • Image files are stored in the FileStorage. The Employee entity contains a link to the corresponding FileDescriptor.

  • The Employee edit screen shows the picture and also supports uploading, downloading and clearing the picture.

Entity class with a link to the image file:

@Table(name = "SAMPLE_EMPLOYEE")
@Entity(name = "sample$Employee")
public class Employee extends StandardEntity {
...
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "IMAGE_FILE_ID")
    protected FileDescriptor imageFile;

    public void setImageFile(FileDescriptor imageFile) {
        this.imageFile = imageFile;
    }

    public FileDescriptor getImageFile() {
        return imageFile;
    }
}

A view for loading an Employee together with FileDescriptor should include all local attributes of FileDescriptor:

<view class="com.company.sample.entity.Employee"
      name="employee-edit">
    <property name="name"/>
    ...
    <property name="imageFile"
              view="_local">
    </property>
</view>

A fragment of the Employee edit screen XML descriptor:

<groupBox caption="Photo" spacing="true"
          height="300px" width="300px" expand="image">
    <image id="image"
           width="100%"
           align="MIDDLE_CENTER"
           scaleMode="CONTAIN"/>
    <hbox align="BOTTOM_LEFT"
          spacing="true">
        <upload id="uploadField"/>
        <button id="downloadImageBtn"
                caption="Download"
                invoke="onDownloadImageBtnClick"/>
        <button id="clearImageBtn"
                caption="Clear"
                invoke="onClearImageBtnClick"/>
    </hbox>
</groupBox>

Components used to display, upload and download images are contained within the groupBox container. Its top part shows a picture using the image component, while its bottom part from left to right contains the upload component and buttons to download and clear the image. As a result, this part of the screen should look like this:

images recipe

Now, let us have a look at the edit screen controller.

import com.haulmont.cuba.core.entity.FileDescriptor;
import com.haulmont.cuba.core.global.FileStorageException;
import com.haulmont.cuba.gui.components.*;
import com.company.employeeimages.entity.Employee;
import com.haulmont.cuba.gui.data.DataSupplier;
import com.haulmont.cuba.gui.data.Datasource;
import com.haulmont.cuba.gui.export.ExportDisplay;
import com.haulmont.cuba.gui.export.ExportFormat;
import com.haulmont.cuba.gui.upload.FileUploadingAPI;

import javax.inject.Inject;
import java.util.Map;

public class EmployeeEdit extends AbstractEditor<Employee> {

    @Inject
    private DataSupplier dataSupplier;
    @Inject
    private FileUploadingAPI fileUploadingAPI;
    @Inject
    private ExportDisplay exportDisplay;
    @Inject
    private FileUploadField uploadField;
    @Inject
    private Button downloadImageBtn;
    @Inject
    private Button clearImageBtn;
    @Inject
    private Datasource<Employee> employeeDs;

    @Inject
    private Image image;

    @Override
    public void init(Map<String, Object> params) {
        uploadField.addFileUploadSucceedListener(event -> {
            FileDescriptor fd = uploadField.getFileDescriptor();
            try {
                fileUploadingAPI.putFileIntoStorage(uploadField.getFileId(), fd);
            } catch (FileStorageException e) {
                throw new RuntimeException("Error saving file to FileStorage", e);
            }
            getItem().setImageFile(dataSupplier.commit(fd));
            displayImage();
        });

        uploadField.addFileUploadErrorListener(event ->
                showNotification("File upload error", NotificationType.HUMANIZED));

        employeeDs.addItemPropertyChangeListener(event -> {
            if ("imageFile".equals(event.getProperty()))
                updateImageButtons(event.getValue() != null);
        });
    }

    @Override
    protected void postInit() {
        displayImage();
        updateImageButtons(getItem().getImageFile() != null);
    }

    public void onDownloadImageBtnClick() {
        if (getItem().getImageFile() != null)
            exportDisplay.show(getItem().getImageFile(), ExportFormat.OCTET_STREAM);
    }

    public void onClearImageBtnClick() {
        getItem().setImageFile(null);
        displayImage();
    }

    private void updateImageButtons(boolean enable) {
        downloadImageBtn.setEnabled(enable);
        clearImageBtn.setEnabled(enable);
    }

    private void displayImage() {
        if (getItem().getImageFile() != null) {
            image.setSource(FileDescriptorResource.class).setFileDescriptor(getItem().getImageFile());
            image.setVisible(true);
        } else {
            image.setVisible(false);
        }
    }
}

  • The init() method first initializes the uploadField component that is used for uploading new images. In the case of a successful upload, a new FileDescriptor instance is retrieved from the component and the corresponding files are sent from the temporary client storage to FileStorage by invoking FileUploadingAPI.putFileIntoStorage(). After that, the FileDescriptor is saved to the database by invoking DataSupplier.commit(), and the saved instance is assigned to the imageFile attribute of the edited Employee entity. Then, the controller’s displayImage() method is invoked to display the uploaded image.

    After that, a listener is added in the init() method to the datasource containing an Employee instance. The listener enables or disables download and clear buttons, depending on the fact whether the file has been loaded or not.

  • postInit() method performs file display and refreshes the button states, depending on the existence of a loaded file.

  • onDownloadImageBtnClick() is invoked when the downloadImageBtn button is clicked; it downloads the file using the ExportDisplay interface.

  • onClearImageBtnClick() is invoked when the clearImageBtn is clicked; it clears the imageFile attribute of the Employee entity. The file is not deleted from storage.

  • displayImage() loads the file from storage and sets the content of the image component.