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Qt-interest Archive, July 2007
QPointer question

Message 1 in thread

I have a Form:

class StepListForm : public QWidget, public StepListFormClass
{
...
}

so declared:
QPointer<StepListForm>	lpStepListForm;

When I close the form from my application (for istance with the click on 
the form close button "X" ) lpStepListForm is set to NULL, but if I call 
lpStepListForm->close() lpStepListForm isn't set to NULL. Why?

Thanks
Teo

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Message 2 in thread

Hi,

matteo wrote:
> I have a Form:
> 
> class StepListForm : public QWidget, public StepListFormClass
> {
> ...
> }
> 
> so declared:
> QPointer<StepListForm>    lpStepListForm;
> 
> When I close the form from my application (for istance with the click on 
> the form close button "X" ) lpStepListForm is set to NULL, but if I call 
> lpStepListForm->close() lpStepListForm isn't set to NULL. Why?

You need to set the widget attribute Qt::WA_DeleteOnClose e.g.

lpStepListForm->setAttribute( Qt::WA_DeleteOnClose );

Tim

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Message 3 in thread

Hi,

The coffee hasn't kicked in; I should have read your question more 
closely also...

Ceruti Simone Matteo wrote:
> Ops, i forget to write that when I open the form i use:
> 
>    if (lpStepListForm.isNull())
>    {
>        lpStepListForm = new StepListForm(lpMainWindow);
>        lpStepListForm->setWindowFlags(Qt::Dialog | 
> Qt::MSWindowsFixedSizeDialogHint);
>        lpStepListForm->setAttribute(Qt::WA_DeleteOnClose);
>        lpStepListForm->move(nStepListFormX,nStepListFormY);
>        lpStepListForm->show();
>    }
> but the problem is present.

Is the call to close() returning false? Is the widget hidden after the 
call to close(), but not deleted?

Tim

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