Bindable dynamic properties on QObject or QQuickItem?
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Is there a way to dinamically create a property on a QObject, QQuickItem or QQmlContext that will notify changes done by QML to C++?
setProperty and setContextProperty do not notify changes done by QML to the c++ side.
Using a static Q_PROPERTY with a QVariant map is the same, changes on "sub values" are not notified to the c++ side.
I'm not sure about the QQmlProperty class, can this be used to create Q_PROPERTY(ies) or is it just an interface to existing Q_PROPERTIES?
Thanks in advance
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Is there a way to dinamically create a property on a QObject, QQuickItem or QQmlContext that will notify changes done by QML to C++?
setProperty and setContextProperty do not notify changes done by QML to the c++ side.
Using a static Q_PROPERTY with a QVariant map is the same, changes on "sub values" are not notified to the c++ side.
I'm not sure about the QQmlProperty class, can this be used to create Q_PROPERTY(ies) or is it just an interface to existing Q_PROPERTIES?
Thanks in advance
@Fede-Devi said in Bindable dynamic properties on QObject or QQuickItem?:
Using a static Q_PROPERTY
right, they are static. So they are created at compile time (MOC).
Dynamic properties do not have a signal to trigger changes.You can create Q_PROPERTY properties of type
QObject*. Those objects then can have properties which trigger changes.
But at the end bindable properties always need to be 'static' and be known to the meta-object.What is your use-case to need dynamic properties?! i don't see how this might be useable in any way?!
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@Fede-Devi said in Bindable dynamic properties on QObject or QQuickItem?:
Using a static Q_PROPERTY
right, they are static. So they are created at compile time (MOC).
Dynamic properties do not have a signal to trigger changes.You can create Q_PROPERTY properties of type
QObject*. Those objects then can have properties which trigger changes.
But at the end bindable properties always need to be 'static' and be known to the meta-object.What is your use-case to need dynamic properties?! i don't see how this might be useable in any way?!
What is your use-case to need dynamic properties?! i don't see how this might be useable in any way?!
The application is completely model driven.
The use case is exposing a single selected item of an item model with the same role names and same syntax of the item model and with "both-ways binding".
something like:
Textfield {
text : itemModel.current.rolename;
onTextChanged: itemModel.current.rolename = text;
}Is there another way?
I could notify the c++ manually with a Q_INVOKABLE but I would like to keep the syntax consistent.
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@Fede-Devi said in Bindable dynamic properties on QObject or QQuickItem?:
QQmlPropertyMap
In case your solution is not enough you can check out my write-up about this topic: https://machinekoder.com/creating-qml-properties-dynamically-runtime-c/
I have to take a look at QQmlPropertyMap as well.
