import com.google.gwt.user.client.ui.HasVisibility; //导入依赖的package包/类
private void toggle(ToggleGVO toggleGVO, WindowActivity activity) {
	List<BuiltInComponentGVO> builtInComponents = toggleGVO.getComponents();
	if (builtInComponents == null) {
		return;
	}
	for (BuiltInComponentGVO builtInComponentGVO : builtInComponents) {
		List<UIObject> widgets = getWidgets(builtInComponentGVO, activity);			
		if (QAMLUtil.isEmpty(widgets)) {
			continue;
		}
		for (UIObject widget : widgets) {
			if (widget instanceof HasVisibility) {
				HasVisibility hasVisibility = (HasVisibility)widget;
				boolean visible = hasVisibility.isVisible();
				hasVisibility.setVisible(!visible);
			}
		}
	}
}
 

import com.google.gwt.user.client.ui.HasVisibility; //导入依赖的package包/类
public ClassTreePresenter(GWTReflectionServiceAsync rpcService, ObjectConfigurationMap objectConfigurationMap,
        String baseClassName, Display view)
{
    this.display = view;

    setRootNodePresenter(new ClassTreeNodePresenter(rpcService, objectConfigurationMap, baseClassName,
            display.createRootView(baseClassName)));

    if (getRootNodePresenter().getDisplay() instanceof HasVisibility)
    {
        ((HasVisibility) getRootNodePresenter().getDisplay()).setVisible(true);
    }
    bind();
}
 

import com.google.gwt.user.client.ui.HasVisibility; //导入依赖的package包/类
@Override
public boolean accepts(HasVisibility handler, Object event) {
  return handler.isVisible();
}