[Interest] Only 9 QML components can be created partially?

[Jonathan Greig]

Jonathan P. Greig
aka redteam316
RIP 6/13/1984 - 2/7/2016


On Sun, Oct 1, 2017 at 4:16 AM, Richard Weickelt <richard at weickelt.de>
wrote:

> Hi,
>
> the following example fails after 9 loop iterations:
>
> #include <QtCore>
> #include <QtQml>
>
> int main(int argc, char *argv[])
> {
>     QCoreApplication app(argc, argv);
>     QQmlEngine engine;
>     QQmlComponent* components[47];
>     QObject* objects[47];
>
>     for (int i = 0; i <= 47; i++)
>     {
>         components[i] = new QQmlComponent(&engine);
>         components[i]->setData("import QtQml 2.0\n QtObject{}", QUrl());
>         objects[i] = components[i]->beginCreate(engine.rootContext());
>         Q_ASSERT(objects[i] != NULL);
>     }
> }
>
> Command line:
>   $ test
>   QQmlComponent: Component creation is recursing - aborting
>   ASSERT: "objects[i] != NULL" in file /XXX/testmain.cpp, line 16
>
> I do not see, how this relates to recursion. The root cause seems to be
> http://code.qt.io/cgit/qt/qtdeclarative.git/commit/?id=
> 19c0a31319148d4ac716f7cb3295891b5a3b20d9
>
> In fact, this patch does not detect recursive component creation. But it
> triggers when more than 9 components are partially created, no matter in
> what structure/order.
>
> Q1: Is the implementation in QQmlComponent wrong?
> Q2: Is my use case a valid one?
>
> Background: I need to create a couple of QML components, but I cannot
> complete creation until all components are partially loaded. Each component
> has a (constant) property that needs to be evaluated first. Depending on
> that, some properties will be injected in the other components.
>
> Q3: Can I achieve that in a different (but simple) way?
>
> Thanks
> Richard
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>
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