[Kde-bindings] playground/bindings/kimono

Richard Dale rdale at foton.es
Thu Mar 22 20:44:10 UTC 2007

On Thursday 22 March 2007, Richard Dale wrote:
> * Hmm, a fix for a GCHandle leak stopped custom slots from working for
>   no apparent reason.
Ah, found it - I fixed the GCHandle leaks which meant that there were no 
references to the LCDRange instances. Then references to LCDRange class 
instances were being freed from the weak reference map because they didn't 
have a parent at the time they were constructed. The IsContainedInstance() 
test is only tested at construction time and consequently references to the 
LCDRange weren't added to the strong reference map. And so when a custom slot 
was invoked on an LCDRange it couldn't be found via the weak reference map.

// No parent here:
LCDRange angle = new LCDRange(Tr("ANGLE"));


QVBoxLayout leftLayout = new QVBoxLayout();


QGridLayout gridLayout = new QGridLayout();
 gridLayout.AddLayout(leftLayout, 1, 0);


// angle finally gets a parent

So as far as I can see this is quite tricky to fix. If we added the PyQt SIP 
annotations even, as far as I can see it would need to do runtime checks on 
the children of the GameBoard widget at the point of the SetLayout() call.

-- Richard

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