QML ListElement pass list of strings

Question

I have a listview who's delegate has a repeater in it which is supposed to be populated by text. If the repeater's model property is hard coded this way:

model: ['String 1', 'String 2', 'String 3'];

It works perfectly by showing 3 items in the repeater's region.
However, I want to send such a list using a ListElement and this is what I tried:

ListElement{
    shape: "Circle"; colors: ['Red', 'Blue'];
}

Unfortunately this approach doesn't work and throws an error:

ListElement: cannot use script for property value

How many I achieve this? TIA

Answer 1

An alternative to @Mitch's answer would be to ditch the ListModel and use a plain Javascript array of objects as the model.

With that solution, you'll lose the dynamic features of the ListModel (adding, removing, inserting, ...). You also won't be able to use sections in your view or use a proxymodel on this model.

import QtQuick 2.6
import QtQuick.Window 2.0

Window {
    visible: true
    width: 200
    height: 200

    ListView {
        width: 32
        height: 64
        anchors.centerIn: parent
        model: [
            {
                shape: "Circle",
                colors: ["red", "blue"]
            },
            {
                shape: "Square",
                colors: ["green", "yellow"]
            }
        ]
        delegate: Rectangle {
            width: 32
            height: 32
            radius: modelData.shape === "Circle" ? width / 2 : 0

            gradient: Gradient {
                GradientStop {
                    position: 0
                    color: modelData.colors[0]
                }
                GradientStop {
                    position: 1
                    color: modelData.colors[1]
                }
            }
        }
    }
}

Answer 2

You can't:

Values must be simple constants; either strings (quoted and optionally within a call to QT_TR_NOOP), boolean values (true, false), numbers, or enumeration values (such as AlignText.AlignHCenter).

The most powerful way to expose data to views is by creating a C++ model.

However, if you really don't want to go to C++, you could store the colours in a comma-separated string, and then split them:

import QtQuick 2.6
import QtQuick.Window 2.0

Window {
    visible: true
    width: 200
    height: 200

    ListView {
        width: 32
        height: 64
        anchors.centerIn: parent
        model: ListModel {
            ListElement{
                shape: "Circle"
                colors: "red, blue"
            }
            ListElement{
                shape: "Square"
                colors: "green,yellow"
            }
        }
        delegate: Rectangle {
            width: 32
            height: 32
            radius: shape === "Circle" ? width / 2 : 0

            property var colorArray: colors.split(",")

            gradient: Gradient {
                GradientStop {
                    position: 0
                    color: colorArray[0]
                }
                GradientStop {
                    position: 1
                    color: colorArray[1]
                }
            }
        }
    }
}