Detailed Description▲
The list type refers to a list of QML objects.
A list value can be accessed in a similar way to a JavaScript array:
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Values are assigned using the [] square bracket syntax with comma-separated values
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The length property provides the number of items in the list
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Values in the list are accessed using the [index] syntax
Values can be dynamically added to the list by using the push method, as if it were a JavaScript Array
A list can only store QML objects, and cannot contain any basic type values. (To store basic types within a list, use the var type instead.)
When integrating with C++, note that any QQmlListProperty value passed into QML from C++ is automatically converted into a list value, and vice-versa.
Using the list Type▲
For example, the Item type has a states list-type property that can be assigned to and used as follows:
import QtQuick 2.0
Item {
width: 100; height: 100
states: [
State { name: "activated" },
State { name: "deactivated" }
]
Component.onCompleted: {
console.log("Name of first state:", states[0].name)
for (var i = 0; i < states.length; i++)
console.log("state", i, states[i].name)
}
}The defined State objects will be added to the states list in the order in which they are defined.
If the list only contains one object, the square brackets may be omitted:
import QtQuick 2.0
Item {
width: 100; height: 100
states: State { name: "activated" }
}Objects in a list can be replaced with the [] operator, just like entries of JavaScript arrays. You can also use push() to append entries, or you can set the length property of the list to truncate or extend it. You can not automatically extend the list by assigning to an index currently out of range, though. Furthermore, if you insert null values into the list, those are converted to nullptr entries in the underlying QQmlListProperty.
This basic type is provided by the QML language.
See Also▲
See also QML Basic Types