How to H/V scrollable table with A LOT of items (ListView of ListViews)

[crsn]

Hi,

I'm trying to design a qml item that will contain thousands of items with the layout of a grid.

I tried several approaches (TableView, GridView) but everytime I had issues trying to resize my Component using a rows * columns format or with memory.

The best approach i found so far is the following:

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.2

ApplicationWindow {
    title: qsTr("Hello World")
    width: 800
    height: 600
    visible: true

    Item {
        id: grid
        property int numRows: 1000
        property int numColumns: 1000
        property int cellSize: 35
        property int cellSpacing: 1

        anchors.fill: parent

        ScrollView {
            id: scrollView
            anchors.fill: parent
            anchors.centerIn: parent
            contentItem: columnsList

            ListView {
                id: columnsList

                anchors.fill: parent
                anchors.centerIn: parent
                orientation: ListView.Vertical
                spacing: grid.cellSpacing
                clip: true
                interactive: false
                cacheBuffer: 1

                model: grid.numRows

                delegate: ListView {
                    id: row
                    width: columnsList.width
                    height: grid.cellSize
                    orientation: ListView.Horizontal
                    spacing: grid.cellSpacing
                    clip: true
                    interactive: false
                    cacheBuffer: 1

                    model: grid.numColumns
                    delegate: Rectangle {
                        width: grid.cellSize
                        height: grid.cellSize
                        color: "green"
                    }
                }
            }
        }
    }

It would be perfect if it wasn't for the fact that the horizontal scrollbar isn't shown!
I trid also to set height and width manually, but this causes all the cells to be created and it's not acceptable.

Is it a good approach?
Is there a workaround to make the horizontal scrollbar appear?