import QtQuick 2.6

GridView {
    id: grid
    width: 400
    height: contentHeight

    cellWidth: width/Math.round(width/170)
    cellHeight: cellWidth*4/3

    interactive: false

    model: ListModel {
        id: myList
    }

    header: Component {
        Rectangle {
            width: grid.cellWidth
            height: grid.cellHeight
            color: "red"
        }
    }

    delegate: Component {
        Rectangle {
            width: grid.cellWidth
            height: grid.cellHeight
            color: "blue"
        }
    }
}