Support to declare GObject properties about gi-crystal HOT 3 CLOSED

Not all crystal properties can be mapped to GObject properties, therefore I would suggest using an annotation, raising an error if there is no equivalent gtype.

Also, there are modules using the getter, setter, property macros so I think we should put blurb, nick and additional arguments into the annotation.

Example:

@[GObject::Property(min: 10, max: 20, access: :read)]
@some_int : Int32

@[GObject::Property(default: -1, blurb: "this is unused")]
property something : UInt64

We still have to override the setter/getter/property macros to emit a notify signal on property change.

I'm already working on an implementation, there I just looped over the instance vars using {% for Ivar in @type.instance_vars %} and only generated a GObject property where the annotation is set.

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Not all crystal properties can be mapped to GObject properties, therefore I would suggest using an annotation, raising an error if there is no equivalent gtype.

It's true, better just use the annotation so, and if the annotation is going to be explicit used, better put the property options there.

And I think we don't need to care about constructor-only properties.

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Implemented on 6383125

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