Qt 5.7 | Qt QML | QML Types | list QML Basic Type

Qt 5.7.1 Reference Documentation

# list QML Basic Type

a list of QML objects.

The `list` type refers to a list of QML objects.

A list value can be accessed in a similar way to a JavaScript array:

- Values are assigned using the `[]` square bracket syntax with comma-separated values
- The `length` property provides the number of items in the list
- Values in the list are accessed using the `[index]` syntax

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" }
      }

Note that objects cannot be individually added to or removed from the list once created; to modify the contents of a list, it must be reassigned to a new list.

Note: The `list` type is not recommended as a type for custom properties. The `var` type should be used instead for this purpose as lists stored by the `var` type can be manipulated with greater flexibility from within QML.

This basic type is provided by the QML language.

See also QML Basic Types.