[Interest] problem with type registration during QML module compilation

[Mike Trahearn]

One option I just thought of (although convoluted) is keeping your original
library as-is and then making a QML module containing not much more than
headers with structs that declare QML_FOREIGN over just the types that need
to be used in QML. Those headers can be in the same folder as the QML
module but the original library can be elsewhere with its own include paths
and structure, so long as the QML module library can link to it and reach
the library's headers. The QML module need not provide any further
implementation so long as the foreign types it is registering are well
behaved from a QML point of view (good properties with NOTIFY/CONSTANT and
FINAL)
As I said, it's convoluted but it does have the advantage of being able to
leave old code alone. That's one of the main purposes of QML_FOREIGN.

On Sat, 13 July 2024, 4:38 am Stefan Seefeld, <stefan at seefeld.name> wrote:

> Hello,
>
> any idea why I'm getting the below error ? What tool is used to generate
> the *_qmltyperegistrations.cpp file, and how does it figure out to add the
> line `#include <A.h>` instead of `#include <view/A.h>` ?
>
> On Fri, Jul 5, 2024 at 10:15 AM Stefan Seefeld <stefan at seefeld.name>
> wrote:
>
>> Hello,
>>
>> following up on an earlier conversation...
>>
>> I'm trying to convert a legacy QML module to use the "new"
>> `qt_add_qml_module` function. This process includes the generation of a
>> ..._qmltyperegistrations.cpp file that contains an invalid reference to a
>> header file <A.h>
>>
>> My library layout looks like this:
>>
>> libs/foo/
>> ├── CMakeLists.txt
>> ├── view
>> │   ├── A.h
>> │   ...
>> ├── qml
>> ...
>>
>> and the makefile above compiles a shared library libfoo.so from the
>> contents. I now want to use `qt_add_qml_module()` to automate the
>> generation of the associated QML module (including all the QML resources,
>> as well as exposing the QML types defined in C++, such as the one in
>> `view/A.h`. However, the generated code expects to be able to include
>> "A.h", while it should actually be including "view/A.h". Is there a
>> property I should be passing to `qt_add_qml_module()` to make that happen,
>> or is there anything else I'm missing ?
>>
>> For context: The type `A` is actually a singleton (a QQmlPropertyMap)
>> which is accessed directly from C++ code, so its C++ API needs to be
>> accessible as a regular class in the library, in addition to being
>> registered to the QML runtime.
>>
>> Thanks for any help,
>>
>> --
>>
>>       ...ich hab' noch einen Koffer in Berlin...
>>
>>
>
> --
>
>       ...ich hab' noch einen Koffer in Berlin...
>
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