Hello,
I encountered a "friction point", and I think a bug, in QML with the
"required" attribute for properties, when used in a view delegate.
Here is an example hacked from the docs :
Item {
ListModel {
id: myModel
ListElement { type: "Dog"; age: 8; noise: "meow" }
ListElement { type: "Cat"; age: 5; noise: "woof" }
}
component SomeDelegate: Item {
required property int age
property string text
}
Repeater {
model: myModel
delegate: SomeDelegate {
text: model.noise
}
}
}
Which raises the error "ReferenceError: model is not defined", as
documented. Is there a way around this?
I feel like this should be valid, as the delegate may not exactly match the
model in every case. I would prefer not having this "auto-bind" feature and
keep access to model/modelData/index.
But then, if I can't modify SomeDelegate (or want to keep the required
property), how do I do?
I tried various things to encapsulate SomeDelegate into something else, but
I always get the same error. As soon as some child item has a required
property, "model" is not available anymore. This is a bug, right?
The following doesn't work for example (same error):
Item {
ListModel {
id: myModel
ListElement { type: "Dog"; age: 8; noise: "meow" }
ListElement { type: "Cat"; age: 5; noise: "woof" }
}
component SomeDelegate: Item {
required property int age
property string text
}
component AnotherDelegate: Item {
property int _age
property string _text
SomeDelegate {
age: 0
text: ""
}
}
Repeater {
model: myModel
delegate: AnotherDelegate {
_age: model.age
_text: model.noise
}
}
}
(I'm testing with qml/qmlscene, Qt 6.3.0, Qt 5.15.2)
Thank you,
--
Benjamin
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