How to use

setVisible

method

in

org.apache.wicket.markup.html.panel.Panel

  protected Panel createFooterPanel(String id) {
    Panel panel = new EmptyPanel(id);
    panel.setVisible(false);
    return panel;
  }
}

@Override
protected void onConfigure() {
  super.onConfigure();
  if (showOrienteerModulesPanel) {
    orienteerModulesPanel.setVisible(true);
    userModulePanel.setVisible(false);
  } else {
    userModulePanel.setVisible(true);
    orienteerModulesPanel.setVisible(false);
  }
}

/**
 * Override this method if you need a top panel. The default top panel is empty and not visible.
 */
protected void addTopPanel()
{
 final Panel topPanel = new EmptyPanel("topPanel");
 topPanel.setVisible(false);
 form.add(topPanel);
}

private List<Panel> buildPanelsForCategories(final MenuHierarchy menu, final Node subject, String[] categories) throws RepositoryException {
  List<Panel> list = new ArrayList<>();
  for (final String category : categories) {
    List<Panel> panels = buildPanelsForCategory(subject, category);
    for (Panel panel : panels) {
      panel.visitChildren(Panel.class, new MenuVisitor(menu, category));
      panel.setVisible(false);
      list.add(panel);
    }
  }
  return list;
}

/**
 * Override this method if you need a bottom panel. The default bottom panel is empty and not visible.
 */
protected void addBottomPanel(final String id)
{
 final Panel bottomPanel = new EmptyPanel(id);
 bottomPanel.setVisible(false);
 form.add(bottomPanel);
}

public void removeItem(AjaxRequestTarget target){
  Panel panel = new EmptyPanel("container");
  addOrReplace(panel);
  panel.setOutputMarkupId(true);
  panel.setVisible(false);
  target.add(panel);
}

@Override
public void onClick(AjaxRequestTarget target) {
  if (widget.hasSettings()) {
    WidgetPanel widgetPanel = findParent(WidgetPanel.class);
    Panel settingsPanel = widgetPanel.getSettingsPanel();
    settingsPanel.setVisible(true);
    target.add(settingsPanel);
  }
}

@Override
public void onClick(AjaxRequestTarget target) {
  if (widget.hasSettings()) {
    WidgetPanel widgetPanel = findParent(WidgetPanel.class);
    Panel settingsPanel = widgetPanel.getSettingsPanel();
    settingsPanel.setVisible(true);
    target.add(settingsPanel);
  }
}

public WidgetPanel(String id, IModel<Widget> model) {
  super(id, model);
  
  Widget widget = model.getObject(); 
    
  setOutputMarkupId(true);
  
  widgetHeaderPanel = new WidgetHeaderPanel("header", model);
  add(widgetHeaderPanel);
  
  if (model.getObject().hasSettings()) {
    settingsPanel = widget.createSettingsPanel("settings");
  } else {
    settingsPanel = new EmptyPanel("settings");
  }
  settingsPanel.setOutputMarkupPlaceholderTag(true);
  settingsPanel.setVisible(false);
  add(settingsPanel);
    
  widgetView = model.getObject().createView("content"); 
  add(widgetView);
}

public WidgetPanel(String id, IModel<Widget> model) {
  super(id, model);
  
  Widget widget = model.getObject(); 
    
  setOutputMarkupId(true);
  
  widgetHeaderPanel = new WidgetHeaderPanel("header", model);
  add(widgetHeaderPanel);
  
  if (model.getObject().hasSettings()) {
    settingsPanel = widget.createSettingsPanel("settings");
  } else {
    settingsPanel = new EmptyPanel("settings");
  }
  settingsPanel.setOutputMarkupPlaceholderTag(true);
  settingsPanel.setVisible(false);
  add(settingsPanel);
    
  widgetView = model.getObject().createView("content"); 
  add(widgetView);
}

      .add(annotatorsProgressPercentageImage).add(projectName)
      .add(annotationDocumentStatusTable));
  annotationDocumentStatusTable.setVisible(false);
}else{
  annotationDocumentStatusTable = new EmptyPanel("rsTable");
  monitoringDetailForm.setVisible(false);
  add(monitoringDetailForm);
  annotationDocumentStatusTable.setVisible(false);
  annotatorsProgressImage.setVisible(false);
  annotatorsProgressPercentageImage.setVisible(false);

      .add(annotatorsProgressPercentageImage)
      .add(annotationDocumentStatusTable));
  annotationDocumentStatusTable.setVisible(false);
} else {
  annotationDocumentStatusTable = new EmptyPanel("rsTable");
  monitoringDetailForm.setVisible(false);
  add(monitoringDetailForm);
  annotationDocumentStatusTable.setVisible(false);
  annotatorsProgressImage.setVisible(false);
  annotatorsProgressPercentageImage.setVisible(false);

    !(deprecated && isEmpty(parameterValue))
        && !paramMetadata.getLevel().equals("program");
parameterPanel.setVisible(visible);
parameterPanel.setVisibilityAllowed(visible);