Hi,
so far I understood objects derived from WObject are automatically deleted
once their parent is deleted (similar to Qt QObjects), e.g.
new WLabel(parent)
is automatically deleted once parent is deleted.
When only using
new WLabel()
it has to be deleted manually.
I recognized that when using (nested) layouts at least within a
WContainerWidget I have to create my WObjects without making it a child of
the parent WContainerWidget, else I get a warning like
Warning: WContainerWidget: ignoring twice addWidget!
Simplified ctor:
SampleClass::SampleClass(...) : WContainerWidget(...)
{
WVBoxLayout* vLayout = new VBoxLayout(this);
WGridLayout* gridLayout = new WGridLayout();
WLabel* foobar = new WLabel();
vLayout->addItem(gridLayout);
gridLayout->addWidget(foobar, 0, 0);
}
This works fine but I'm unsure whether I have to delete foobar manually.
If I specify 'this' (derived from WContainerWidget) to the WLabel ctor I get
the above warning message.
Looking at the sourcecode it seems that WLayout::addWidget(widget) calls
WContainerWidget::addWidget(widget) which would make widget a child of the
WContainerWidget again and therefore it has not to be deleted manually.
I just want to be sure whether WObjects added to a WLayout become part of
the object tree and are automatically deleted.
Also I'm unsure about the WLayouts itself as they don't derive from
WObject - what's about them in this context?
Regards
Peter
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