[Qt-interest] Unable to bring Scrollbar Properties in MDI subwindow of type QGraphicsView

[John McClurkin]

Kamakshi Sivaraman wrote:
> 
> Hi,
> 
> Actually I tried using all the flags required to set the scrollbar for 
> QGraphics View.
> 
> The code snippet is follows :
> 
> ChildFileApp::ChildFileApp(QList<structSysLogParams> 
> lstSysLogParams,QGraphicsView *parent)
>         :QGraphicsView(parent)
> {
>        
>         setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
>          setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
> 
>         .   ..    ..     ..     ..     ...
> }
> 
> Where ChildFileApp is the mdi subwindow called from MainWindow to show 
> in MDI Area.
> I am painting in the GraphicsView and that painting is exceeding the 
> size of the Subwindow file , then automatically the scroll bars should 
> come,
> But its not happening.
> 
> I hope this will give you some idea that what actually i am trying to say.
> 
> 
> Thanks & Regards,
> S.KAMAKSHI
> Larsen & Toubro Infotech Limited
> Whitefield,
> Bangalore -560066
>
Ok, If I understand correctly, what you seem to be trying to do is not 
possible. You can't put scrollbars on a QMdiSubwindow. A QMdiSubwindow 
is just a container that holds another widget. This can be anything from 
a QWidget to a QMainWindow. What you do is create the object you want to 
display in the QMdiArea with a NULL parent, then add it to the QMdiArea 
with the command mdiArea->addSubWindow(object). In your case, you would 
create a QGraphicsScene object, then a QGraphicsView object with a 
pointer to the scene object as the argument, as described in the 
QGraphicsView or QGraphicsScene documentation. You would set the 
scrollbar policy on the QGraphicsView object. To add the QGraphcisView 
object to the mdi area use a statement like:
	mdiArea->addSubWindow(view);
where mdiArea is a pointer to your QMdiArea object and view is a pointer 
to your QGraphicsView.
Since you set the scrollbar policy to Qt::ScrollBarAsNeeded, the 
scrollbars will not appear unless you resize the mdiSubWindow so the 
view object is smaller than the scene object, or you resize the scene 
object so that is larger than the view object. I don't use the 
QGraphicsView system so I don't know if the scene object will resize 
automatically as objects are added or whether you have to manually 
resize the scene. Take a look at the examples under 
Qt-4.5.0/examples/graphicsview. Once you understand the conditions under 
which the scrollbars of a QGraphicsView object are shown, you can 
proceed to adding such an object to your QMdiArea.