How to Delete Item from Graphics scene from Main Window Tool Box? - qt

Question

In Graphic View set the scene, In Graphic scene(subclass od QGraphicscene) class added Delete item slot.In scene class by delete key i able to delete item but when i call from main window it wont delete item . i am getting call in Delete item slot but selectedItems = 0. what may be causing problem?
In Graphic scene class
void GraphicScene::DeleteItems()//Delete Item slot in scene class
{
qDebug()<<"delete items"<< selectedItems().count();
foreach(QGraphicsItem* item, selectedItems())
{
removeItem(item);
delete item;
}
}
void GraphicScene::keyReleaseEvent(QKeyEvent * keyEvent)// Delete key works fine
{
if (selectedItems().isEmpty())
return;
if(keyEvent->key() == Qt::Key_Delete)
{
DeleteItems();
}
}
In MainWindow class
MainWindow::MainWindow(QWidget *parent)
{
addToolBar(Qt::TopToolBarArea, mpEditToolbar = new
QToolBar());
DeleteAction = new QAction(QIcon(":/images/delete.png"),tr("Object
&Delete"), this);
DeleteAction->setStatusTip(tr("Delete item"));
connect(DeleteAction,SIGNAL(triggered()),mpGraphView ,
SIGNAL(DeleteObject())); // grpah view connecting to delete slot
mpEditToolbar->addAction(DeleteAction);
}
When i do from delete key works fine its not working with tool box delete action. what is the problem?

Answer 1

In Main Window class have private members of GraphicsView and GraphicScene class(subclass)
so that it will be easy to call slot.
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
GraphFrame *mpGraphFrame;
GraphicScene *mpScene;
}
MainWindow.cpp
Connect should be in where you creating GraphicScene Object
MainWindow::MainWindow(QWidget *parent)
{
addToolBar(Qt::TopToolBarArea, mpEditToolbar = new
QToolBar());
DeleteAction = new QAction(QIcon(":/images/delete.png"),tr("Object
&Delete"), this);
DeleteAction->setStatusTip(tr("Delete item"));
connect(DeleteAction,SIGNAL(triggered()),mpGraphScene ,
DeleteItems();
mpEditToolbar->addAction(DeleteAction);
}