qml type annotation with local enum
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QtCreator (qt 6.5.2) compiler is complaing:
Could not compile function getSomething: Cannot resolve the argument type States. [compiler]enum States { State0, State1, State2} function getSomething(id: States): string{ }How should i use an local enum type correctly?
edit: should i use
id: intinstead? -
I see the issue with your QML enum usage. In QML, you can't directly use an enum as a parameter type the way you're trying to do. Here's how to fix it:
Solution 1: Use int as the parameter type while keeping the enum:
qml
enum States { State0, State1, State2 }function getSomething(id: int): string {
if (id === States.State0) return "This is State0";
if (id === States.State1) return "This is State1";
if (id === States.State2) return "This is State2";
return "Unknown state";
}Solution 2: Define the enum in a more QML-friendly way:
// In a separate file, e.g., States.qml
pragma Singleton
import QtQml 2.15QtObject {
readonly property int State0: 0
readonly property int State1: 1
readonly property int State2: 2
}// Then in your main file:
import "path/to/States.qml" as Statesfunction getSomething(id: int): string {
if (id === States.State0) return "This is State0";
// etc.
}The key point is that in QML, enums are essentially integers under the hood, so you need to use id: int as the parameter type. The enum values themselves can still be used for comparison inside the function.
Hope this helps! -
I see the issue with your QML enum usage. In QML, you can't directly use an enum as a parameter type the way you're trying to do. Here's how to fix it:
Solution 1: Use int as the parameter type while keeping the enum:
qml
enum States { State0, State1, State2 }function getSomething(id: int): string {
if (id === States.State0) return "This is State0";
if (id === States.State1) return "This is State1";
if (id === States.State2) return "This is State2";
return "Unknown state";
}Solution 2: Define the enum in a more QML-friendly way:
// In a separate file, e.g., States.qml
pragma Singleton
import QtQml 2.15QtObject {
readonly property int State0: 0
readonly property int State1: 1
readonly property int State2: 2
}// Then in your main file:
import "path/to/States.qml" as Statesfunction getSomething(id: int): string {
if (id === States.State0) return "This is State0";
// etc.
}The key point is that in QML, enums are essentially integers under the hood, so you need to use id: int as the parameter type. The enum values themselves can still be used for comparison inside the function.
Hope this helps!@Shrishashank thank you very much.
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https://doc.qt.io/qt-6/qtqml-javascript-hostenvironment.html#type-annotations-and-assertions
It says:
Note: In QML, enumerations are not types and can therefore not be used as type annotations. Their underlying numeric type, int or double, should be used instead.