[Interest] dynamic widget creation in QScrollArea

[Reto Tschofenig, ODT Informatik GmbH]

Hi Frank

if the children are the same type and it's like a table, I would 
recommend the following alternative:

don't inherit from it QScrollArea but instantiate as many child widget's 
as visible. bind now the child-widgets depending of the position of the 
scrollbar with the object.

 > widgets horizontally
my example is vertical, but you could adapt it...

+- ListView ------------------------------------+
| +- Viewport ----------------------------+ +-+ |
| | +- 1. ItemView ---------------------+ | |s| |
| | + Edit Label or whatever            | | |c| |
| | +-----------------------------------+ | |r| |
| | +- 2. ItemView ---------------------+ | |o| |
| | + Edit Label or whatever            | | |l| |
| | +-----------------------------------+ | |l| |
| | +- 3. ItemView ---------------------+ | |b| |
| | + Edit Label or whatever            | | |a| |
| | +-----------------------------------+ | |r| |
| | +- 4. ItemView ---------------------+ | | | |
| | + Edit Label or whatever            | | | | |
| | +-----------------------------------+ | | | |
| +---------------------------------------+ +-+ |
+-----------------------------------------------+

class ListView : QWidget{
   QWidget* _viewport; // the parent for the ItemView's
   QScrollBar* _scrollbar;
   QList<ItemView*> _items;
   int _scrollPosition;
   QList<Object*> _objects;
}
class ItemView : QWidget{
   Object* _object;
   QLineEdit* _someEdits;
   void bind( Object* object );
}

 > smooth vertical scrolling
Of course, the child-widgets could be also pixel accuracy moved.

 > QListView in icon mode
replace the QLineEdit with a Icon-Widget or Label or paint it in 
ItemView directly.

good luck
Reto

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