[Solved] QGraphicsItem::ItemFlagsHaveChanged: correct cast?
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I would like to use the QVariant value from QGraphicsItem::itemChange with the change flag QGraphicsItem::ItemFlagsHaveChanged.
The docs say about this change:
bq. The item's flags have changed. The value argument is the new flags (i.e., a quint32). Do not call setFlags() in itemChange() as this notification is delivered. The return value is ignored.From this, I gather the correct cast from value to QGraphicsItem::GraphicsItemFlags is:
@static_castQGraphicsItem::GraphicsItemFlags(value.value<qint32>())@
However, this feels wrong. What if I compile with 64 bits? Won't the Flags be 64 bits wide by default then? Okay, the cast would still work, but it doesn't feel right?
IS it right?
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The meta type stored by the QVariant in this case is QVariant::Uint, so the correct cast would be:
[object Object].value<uint>()@
Since the notification tells you that the flags have already changed you don't actually need this cast. Just use QGraphicsItem::flags() to get the current value.
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Thanks to your post, I realized I should simply look in the code. And there it is:
qgraphicsitem.cpp
@ // Notify change.
itemChange(ItemFlagsHaveChanged, quint32(flags));@I guess you get QVariant::Uint for qint32 when using 32-bit Qt. Might be different for 64 bits. So it seems my original cast was correct.
Side note: I forward the value into a class that doesn't have access to flags(). So the cast is relevant for me.
