[Qt-interest] Fwd: widget promotion

[ami guru]

Hello Andreas,


Thanks for the help.

It did work.

But i need to clear up some confusion.

I have myClass as a subclass of QGraphicsView.

Now if i want to use myClass as a widget in the designer
then is that must i have to use QGraphicsView as a place-holder.

Lets try to analyze to  the what you have suggested.

class H3DNodeView : public QGraphicsView
  {
     H3DNodeView(QWidget *parent) : QGraphicsView(parent)
     {

     }
  };


I opended the ui_***.h file found as follows:

  //my custimized class
  H3DNodeView *graphicsView;

 treeViewH3D = new QTreeView(centralwidget);


the constructor takes a pointer to the QWidget and
set that as the parent of the QGraphicsView and that makes sense.


Is there anything i missed in the concept?


Regards
Sajjad

---------- Forwarded message ----------
From: Andreas Pakulat <apaku at gmx.de>
Date: Sat, Dec 27, 2008 at 2:17 PM
Subject: Re: [Qt-interest] widget promotion
To: qt-interest at trolltech.com


On 27.12.08 14:05:44, ami guru wrote:
> I have customized class with QGaphicsView as a base class .
>
> In the designer i have a main window and dragged a QGraphicsView
> widget and placed that in the form to use that as the placeholder.
>
> Then i promoted that to my customized one.
>
> The customized class that i have has a constructor.
>
> What should be the defualt parameter in the constructor
>
> ********************************************************'
> class H3DNodeView : public QGraphicsView
> {
>     H3DNodeView(QWidget *parent = 0);
> };
>
> ****************************************************************'
>
> In that case i have error
>
> H3DNodeView.cpp: In constructor 'H3DNodeView::H3DNodeView(QWidget*)':
> H3DNodeView.cpp:5: error: type 'QWidget' is not a direct base of
> 'H3DNodeView'

Your constructor implementation is wrong, apparently you're using

H3DNodeView::H3DNodeView( QWidget* parent )
 : QWidget(parent)

But it should be QGraphicsView in the second line.

Andreas

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