#include "DefaultEmptySceneContent.h"


const QString DefaultEmptySceneContent::g_scene_name=QObject::tr("Empty");


/**
 * Default constructor
 *
 */
DefaultEmptySceneContent::DefaultEmptySceneContent(SceneInterface* plugin):
    SceneContent(plugin)
{
}


/**
 * Destructor.
 *
 */
DefaultEmptySceneContent::~DefaultEmptySceneContent()
{
}


/**
 * Implements the copy from other contents.
 *
 * This method is used by the copy constructor.
 * For the empty scene contents, it does nothing.
 *
 * @param content The source content to copy from.
 *
 * @return true if the copy is ok, false otherwise. The copy can fail if
 *         SceneContent is not a DefaultEmptySceneContent.
 *
 * @seealso is_equal_to
 *
 */
bool DefaultEmptySceneContent::copy_from(const SceneContent& data) 
{
    if (!SceneContent::copy_from(data)) return false;
    Q_ASSERT(NULL!=plugin());
    Q_ASSERT(NULL!=data.plugin());
    return true;
}


/**
 * Implements the egality-test with other contents.
 *
 * This could be an operator==. For the empty scene content, the test is not
 * difficult.
 *
 * @param content The content to compare with.
 *
 * @return true if the content are equal, false otherwise. The test can
 *         fail if the contents have different parameters, but also it
 *         SceneContent is not a DefaultEmptySceneContent.
 *
 * @seealso copy_from
 *
 */
bool DefaultEmptySceneContent::is_equal_to(const SceneContent& data) const
{
    if (!SceneContent::is_equal_to(data)) return false;
    return true;
}


/**
 * Draws the empty scene.
 *
 * @param glWidget The QGLWidget that own the OpenGL context.
 * @param cameraMatrix The camera matrix that must be use.
 *
 */
void DefaultEmptySceneContent::draw(QGLWidget *glWidget, const float* cameraMatrix)
{
    Q_UNUSED (glWidget);
    Q_UNUSED(cameraMatrix);
}


/**
 * Loads the empty scene from a QDomElement.
 *
 * This is implemented for convenience, but it does nothing.
 *
 * @param element The QDomElement to read from.
 *
 */
void DefaultEmptySceneContent::initFromDOMElement(const QDomElement& element)
{
    if (!element.isNull())
    {
	SceneContent::initFromDOMElement(element);
    }
}


/**
 * Writes the empty scene in a QDomDocument.
 *
 * This is implemented for convenience, but it does nothing.
 *
 * @param name The name of the element.
 * @param doc The document whom belongs the element.
 *
 * @return The QDomElement to add.
 *
 */
QDomElement DefaultEmptySceneContent::domElement(const QString& name, QDomDocument& doc) const
{
    QDomElement de = SceneContent::domElement(name, doc);
    return de;
}