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../scene/scene.cpp: In member function ‘virtual void Scene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent*)’:
../scene/scene.cpp:13: error: no matching function for call to ‘QMessageBox::warning(Scene* const, QString, QString)’
/usr/include/qt4/QtGui/qmessagebox.h:199: note: candidates are: static QMessageBox::StandardButton QMessageBox::warning(QWidget*, const QString&, const QString&, QFlags<QMessageBox::StandardButton>, QMessageBox::StandardButton)
/usr/include/qt4/QtGui/qmessagebox.h:247: note:                 static int QMessageBox::warning(QWidget*, const QString&, const QString&, int, int, int)
/usr/include/qt4/QtGui/qmessagebox.h:250: note:                 static int QMessageBox::warning(QWidget*, const QString&, const QString&, const QString&, const QString&, const QString&, int, int)
/usr/include/qt4/QtGui/qmessagebox.h:257: note:                 static int QMessageBox::warning(QWidget*, const QString&, const QString&, QMessageBox::StandardButton, QMessageBox::StandardButton)
../scene/scene.cpp: At global scope:
../scene/scene.cpp:10: warning: unused parameter ‘event’
make: *** [scene.o] Ошибка 1

#include <QtGui>

#include "mainwindow.h"
#include "scene.h"

MainWindow::MainWindow()
{
    scene = new Scene;
    view = new QGraphicsView(scene);
    view->setScene(scene);
    QTabWidget *tab = new QTabWidget;
    tab->setMinimumSize(300,200);
    tab->insertTab(1,view,"Tab1");
    setCentralWidget(tab);
}

MainWindow::~MainWindow()
{
}

#include <QtGui>
#include "scene.h"

Scene::Scene(QObject *parent) :
    QGraphicsScene(parent)
{

}

void Scene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    QMessageBox::warning(this, tr("Message"),
                                tr("This Message!"));
}

Scene::Scene(QWidget *parent) :
    QGraphicsScene(parent)

static int QMessageBox::warning(QWidget*, const QString&, const QString&, const QString&, const QString&, const QString&, int, int)