[Interest] dynamic widget creation in QScrollArea

[Frank Rueter | OHUfx]

Thanks Reto,

I'm not entirely certain I understand your example (I'm using Python).
I'm not quite sure yet how I would instantiate the widgets based on 
their visibility yet, but will think about it again if I can't get the 
QDelegate to work with animation.

Cheers,
frank

On 5/08/16 1:09 am, Reto Tschofenig, ODT Informatik GmbH wrote:
> 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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