[Qt-interest] How to have dynamic pixmap in a QHeaderView item

[Andre Somers]

  Op 19-8-2010 20:40, David Boosalis schreef:
> I want to be able to display a pixmap  in a item of a QTreeView's 
> horizontal header. I have created my own Horizontal Header Class, and 
> have tried to add my own Delegate to column 0 (the column where I want 
> the pixmap to appear).  The trouble is I never see the paint() method 
> for this Delegate.
>
> At first I was setting the labels of the header with the model's 
> method setHorizontalHeaderLabels(QStringList columnNames).  I then 
> went to the trouble of creating a QStandardItem for each column and 
> adding it to the header with setHorizontalHeaderItem(col, headerItem).
>
> After both methods I would create my delegate and add it to the header 
> with:
>
> MyHeaderDelegate *symbolDelegate = new MyHeaderDelegate(this);
> horHeader->setItemDelegateForColumn(0,myHeaderDelegate);
>
> I never see the debug message I have in the paint() method for 
> MyHeaderDelegate.
>
> This is the approach I have used for things such as QTreeView and 
> QTableView, but QHeaderView, even though it  inherits from the same 
> base class  seems to be the bastard child.  Any ideas on how to be 
> able to paint pixmaps for a item in a horizontal header ? I want to be 
> able to control if the pixmap gets painted.  Is using a custom 
> delegate the right way to go ?
QHeaderView does not use the delegates, you'll have to draw them 
yourself directly. Sorry. From the documentation:

    *Note:* Each header renders the data for each section itself, and
    does not rely on a delegate. As a result, calling a
    header'ssetItemDelegate <qabstractitemview.html#setItemDelegate>()
    function will have no effect.


André

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